浅谈ABAQUS用户子程序

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ABAQUS子程序

Home浅谈ABAQUS用户子程序李青清华大学工程力学系摘要本文首先概要介绍了ABAQUS的用户子程序和应用程序，然后从参数，功能两方面详细论述了DLOAD, UEXTERNALDB, URDFIL三个用户子程序和GETENVVAR，POSFIL，DBFILE三个应用程序，并详细介绍了ABAQUS的结果文件（.FIL）存储格式。

关键字ABAQUS，用户子程序，应用程序，结果文件一、前言：ABAQUS为用户提供了强大而又灵活的用户子程序接口（USER SUBROUTINE）和应用程序接口(UTILITY ROUTINE)。

ABAQUS 6.2.5一共有42个用户子程序接口，13个应用程序接口，用户可以定义包括边界条件、荷载条件、接触条件、材料特性以及利用用户子程序和其它应用软件进行数据交换等等。

这些用户子程序接口使用户解决一些问题时有很大的灵活性，同时大大的扩充了ABAQUS的功能。

例如：如果荷载条件是时间的函数，这在ABAQUS/CAE 和INPUT 文件中是难以实现的，但在用户子程序DLOAD中就很容易实现。

二．在ABAQUS中使用用户子程序ABAQUS的用户子程序是根据ABAQUS提供的相应接口，按照FORTRAN语法用户自己编写的代码。

在一个算例中，用户可以用到多个用户子程序，但必须把它们放在一个以.FOR为扩展名的文件中。

运行带有用户子程序的算例时有两种方法，一是在CAE中运行，在EDIT JOB菜单的GENERAL子菜单的USER SUBROUTINE FILE对话框中选择用户子程序所在的文件即可；另外是在ABABQUS COMMAND用运行，语法如下：ABAQUS JOB=[JOB] USER¡[.FOR]¡C用户在编写用户子程序时，要注意以下几点：1．用户子程序不能嵌套。

即任何用户子程序都不能调用任何其他用户子程Home序，但可以调用用户自己编写的FORTRAN子程序和ABAQUS应用程序。

Abaqus 用户子程序uinter介绍

1.1.38 UINTERUser subroutine to define surface interaction behavior for contact surfaces.Product: Abaqus/StandardReferences“User-defined interfacial constitutive behavior,” Section 36.1.6 of the Abaqus Analysis User'sManual*SURFACE INTERACTION“U I N T E R,” Section 4.1.20 of the Abaqus Verification ManualOverviewUser subroutine U I N T E R:is called at points on the slave surface of a contact pair with a user-defined constitutive modeldefining the interaction between the surfaces;can be used to define the mechanical (normal and shear) and thermal (heat flux) interactions between surfaces;can be used when the normal surface behavior (contact pressure versus overclosure) models(“Contact pressure-overclosure relationships,” Section 36.1.2 of the Abaqus Analysis User'sManual) or the extended versions of the classical Coulomb friction model (“Frictional behavior,”Section 36.1.5 of the Abaqus Analysis User's Manual) are too restrictive and a more complexdefinition of normal and shear transmission between contacting surfaces, including damping properties, are required;must provide the entire definition of the mechanical and the thermal interaction between the contacting surfaces (hence, no additional surface behaviors can be specified in conjunction with this capability);can provide the entire definition of viscous and structural damping for interaction between thecontacting surfaces for direct steady-state dynamic analysis;can use and update solution-dependent state variables; andis not available for contact elements.User subroutine interfaceS U B R O U T I N E U I N T E R(S T R E S S,D D S D D R,D V I S C O U S,D S T R U C T U R A L,F L U X,D D F D D T,1D D S D D T,D D F D D R,S T A T E V,S E D,S F D,S P D,S V D,S C D,P N E W D T,R D I S P,2D R D I S P,3T E M P,D T E M P,P R E D E F,D P R E D,T I M E,D T I M E,F R E Q R,C I N A M E,S L N A M E,4M S N A M E,5P R O P S,C O O R D S,A L O C A L D I R,D R O T,A R E A,C H R L N G T H,N O D E,N D I R,N S T A T V,6N P R E D,N P R O P S,M C R D,K S T E P,K I N C,K I T,L I N P E R,L O P E N C L O S E,L S T A T E,7L S D I,L P R I N T)CI N C L U D E'A B A_P A R A M.I N C'CC H A R A C T E R*80C I N A M E,S L N A M E,M S N A M ED I ME N S I O N S T R E S S(N D I R),D D S D D R(N D I R,N D I R),F L U X(2),D D F D D T(2,2),1D D S D D T(N D I R,2),D D F D D R(2,N D I R),S T A T E V(N S T A T V),2R D I S P(N D I R),D R D I S P(N D I R),T E M P(2),D T E M P(2),P R E D E F(2,N P R E D),3D P R E D(2,N P R E D),T I M E(2),P R O P S(N P R O P S),C O O R D S(M C R D),4A L O C A L D I R(3,3),D R O T(2,2),D V I S C O U S(N D I R,N D I R),5D S T R U C T U R A L(N D I R,N D I R)user coding to define S T R E S S,D D S D D R,F L U X,D D F D D T,D D S D D T,D D F D D R,and, optionally,S T A T E V,S E D,S F D,S P D,S V D,S C D,P N E W D T,L O P E N C L O S E,L S T A T E,L S D I,D V I S C O U S,D S T R U C T U R A LR E T U R NE N DVariables to be definedS T R E S S(N D I R)This array is passed in as the stress between the slave and master surfaces at the beginning of theincrement and must be updated in this routine to be the stress at the end of the increment. The stress must be defined in a local coordinate system (see A L O C D I R). This variable must be defined for astress/displacement, a fully coupled temperature-displacement, or a coupled thermal-electrical-structural analysis. The sign convention for stresses is that a positive stress indicates compression across contact surfaces, while a negative stress indicates tension.D D S D D R(N D I R,N D I R)Interface stiffness matrix. D D S D D R(I,J)defines the change in the Ith stress component at the end of the time increment caused by an infinitesimal perturbation of the Jth component of the relativedisplacement increment array. Unless you invoke the unsymmetric equation solution capability in the contact property model definition (“Use with the unsymmetric equation solver in Abaqus/Standard” in “User-defined interfacial constitutive behavior,” Section 36.1.6 of the Abaqus Analysis User'sManual), Abaqus/Standard will use only the symmetric part of D D S D D R. For a particular off-diagonal (I,J) entry, the symmetrization is done by halving the sum of (I,J) and (J,I) components. D D S D D R must be defined for a stress/displacement, a fully coupled temperature-displacement, or a coupled thermal-electrical-structural analysis to ensure proper convergence characteristics.F L U X(2)Magnitude of the heat flux flowing into the slave and master surfaces, respectively. This array is passed in as the value at the beginning of the increment and must be updated to the flux at the end of theincrement. The convention for defining the flux is that a positive flux indicates heat flowing into asurface, while a negative flux indicates heat flowing out of the surface. This variable must be defined fora heat transfer, a fully coupled temperature-displacement, or a coupled thermal-electrical-structuralanalysis. The sum of these two flux terms represents the heat generated in the interface, and thedifference in these flux terms represents the heat conducted through the interface.D D F D D T(2,2)The negative of the variation of the flux at the two surfaces with respect to their respectivetemperatures, for a fixed relative displacement. This variable must be defined for a heat transfer, a fully coupled temperature-displacement, or a coupled thermal-electrical-structural analysis to ensure proper convergence characteristics. The entries in the first row contain the negatives of the derivatives ofF L U X(1)with respect to T E M P(1)and T E M P(2), respectively. The entries in the second row containthe negatives of the corresponding derivatives of F L U X(2).D D S D D T(N D I R,2)Variation of the stress with respect to the temperatures of the two surfaces for a fixed relativedisplacement. This variable is required only for thermally coupled elements (in a fully coupledtemperature-displacement or a coupled thermal-electrical-structural analysis), in which the stress is a function of the surface temperatures. D D S D D T(N D I R,1)corresponds to the slave surface, andD D S D D T(N D I R,2)corresponds to the master surface.D D F D D R(2,N D I R)Variation of the flux with respect to the relative displacement between the two surfaces. This variable is required only for thermally coupled elements (in a fully coupled temperature-displacement or a coupled thermal-electrical-structural analysis), in which the flux is a function of the relative displacement.D D F D D R(1,N D I R)corresponds to the slave surface, and D D F D D R(2,N D I R)corresponds to the mastersurface.Variables that can be updatedD V I S C O U S(N D I R,N D I R)Interface viscous damping matrix that can be used only in direct steady-state dynamic analysis.D V I S C O U S(I,J)defines an element in the material viscous damping matrix at the current frequency.Abaqus/Standard requires that this element is defined as a damping value for each of the (I, J) entries times the current frequency value F R E Q R obtained from the argument list.Unless you invoke the unsymmetric equation solution capability in the contact property model definition (“Use with the unsymmetric equation solver in Abaqus/Standard” in “User-defined interfacialconstitutive behavior,” Section 36.1.6 of the Abaqus Analysis User's Manual), Abaqus/Standard uses only the symmetric part of D V I S C O U S. For a particular off-diagonal (I, J) entry the symmetrization is done by halving the sum of the (I, J) and (J, I) components.D S T R U C T U R A L(N D I R,N D I R)Interface structural damping matrix that can be used only in direct steady-state dynamic analysis.D S T R U C T U R A L(I,J)defines an element in the material structural damping matrix.Unless you invoke the unsymmetric equation solution capability in the contact property model definition(“Use with the unsymmetric equation solver in Abaqus/Standard” in “User-defined interfacialconstitutive behavior,” Section 36.1.6 of the Abaqus Analysis User's Manual), Abaqus/Standard uses only the symmetric part of D S T R U C T U R A L. For a particular off-diagonal (I, J) entry the symmetrization is done by halving the sum of the (I, J) and (J, I) components.S T A T E V(N S T A T V)An array containing the solution-dependent state variables. These are passed in as values at thebeginning of the increment and must be returned as values at the end of the increment. You define the number of available state variables as described in“Allocating space” in “User subroutines: overview,”Section 18.1.1 of the Abaqus Analysis User's Manual.S E DThis variable is passed in as the value of the elastic energy density at the start of the increment and should be updated to the elastic energy density at the end of the increment. This variable is used for output only and has no effect on other solution variables. It contributes to the output variable ALLSE. S F DThis variable should be defined as the incremental frictional dissipation. The units are energy per unit area. This variable is used for output only and has no effect on other solution variables. It contributes to the output variables ALLFD and SFDR (and related variables). For computing its contribution toSFDR, S F D is divided by the time increment.S P DThis variable should be defined as the incremental dissipation due to plasticity effects in the interfacial constitutive behavior. The units are energy per unit area. This variable is used for output only and has no effect on other solution variables. It contributes to the output variable ALLPD.S V DThis variable should be defined as the incremental dissipation due to viscous effects in the interfacial constitutive behavior. The units are energy per unit area. This variable is used for output only and has no effect on other solution variables. It contributes to the output variable ALLVD.S C DThis variable should be defined as the incremental dissipation due to creep effects in the interfacialconstitutive behavior. The units are energy per unit area. This variable is used for output only and has no effect on other solution variables. It contributes to the output variable ALLCD.P N E W D TRatio of suggested new time increment to the time increment currently being used (D T I M E, see below).This variable allows you to provide input to the automatic time incrementation algorithms inAbaqus/Standard (if automatic time incrementation is chosen).P N E W D T is set to a large value before each call to U I N T E R.If P N E W D T is redefined to be less than 1.0, Abaqus/Standard must abandon the time increment and attempt it again with a smaller time increment. The suggested new time increment provided to theautomatic time integration algorithms is P N E W D T × D T I M E, where the P N E W D T used is the minimum value for all calls to user subroutines that allow redefinition of P N E W D T for this iteration.If P N E W D T is given a value that is greater than 1.0 for all calls to user subroutines for this iteration and the increment converges in this iteration, Abaqus/Standard may increase the time increment. Thesuggested new time increment provided to the automatic time integration algorithms is P N E W D T ×D T I M E, where the P NE W D T used is the minimum value for all calls to user subroutines for this iteration.If automatic time incrementation is not selected in the analysis procedure, values of P N E W D T greater than1.0 will be ignored and values of P N E W D T less than 1.0 will cause the job to terminate.L O P E N C L O S EAn integer flag that is used to track the contact status in situations where user subroutine U I N T E R is used to model standard contact between two surfaces, like the default hard contact model inAbaqus/Standard. It comes in as the value at the beginning of the current iteration and should be set to the value at the end of the current iteration. It is set to –1 at the beginning of the analysis beforeU I N T E R is called. You should set it to 0 to indicate an open status and to 1 to indicate a closed status.A change in this flag from one iteration to the next will have two effects. It will result in output relatedto a change in contact status if you request a detailed contact printout in the message file (“TheAbaqus/Standard message file” in “Output,” Section 4.1.1 of the Abaqus Analysis User's Manual). In addition, it will also trigger a severe discontinuity iteration. Any time this flag is reset to a value of –1, Abaqus/Standard assumes that the flag is not being used. A change in this flag from –1 to another value or vice versa will not have any of the above effects.L S T A T EAn integer flag that should be used in non-standard contact situations where a simple open/close status is not appropriate or enough to describe the state. It comes in as the value at the beginning of thecurrent iteration and should be set to the value at the end of the current iteration. It is set to –1 at the beginning of the analysis before U I N T E R is called. It can be assigned any user-defined integer value, each corresponding to a different state. You can track changes in the value of this flag and use it to output appropriate diagnostic messages to the message file (unit 7). You may choose to outputdiagnostic messages only when a detailed contact printout is requested (“The Abaqus/Standardmessage file” in “Output,” Section 4.1.1 of the Abaqus Analysis User's Manual). In the latter case, the L P R I N T parameter is useful. In conjunction with the L S T A T E flag, you may also utilize the L S D I flag to trigger a severe discontinuity iteration any time the state changes from one iteration to the next. Any time this flag is reset to a value of –1, Abaqus/Standard assumes that the flag is not being used.L S D IThis flag is set to 0 before each call to U I N T E R and should be set to 1 if the current iteration should be treated as a severe discontinuity iteration. This would typically be done in non-standard contactsituations based on a change in the value of the L S T A T E flag from one iteration to the next. The use of this flag has no effect when the L O P E N C L O S E flag is also used. In that case, severe discontinuityiterations are determined based on changes in the value of L O P E N C L O S E alone.Variables passed in for informationR D I S P(N D I R)An array containing the current relative positions between the two surfaces at the end of the increment.The first component is the relative position of the point on the slave surface, with respect to the master surface, in the normal direction. The second and third components, if applicable, are the accumulated incremental relative tangential displacements, measured from the beginning of the analysis. For therelative position in the normal direction a negative quantity represents an open status, while a positive quantity indicates penetration into the master surface. For open points on the slave surface for which no pairing master is found, the first component is a very large negative number (–1 × 1036). The local directions in which the relative displacements are defined are stored in A L O C A L D I R.D R D I S P(N D I R)An array containing the increments in relative positions between the two surfaces.T E M P(2)Temperature at the end of the increment at a point on the slave surface and the opposing mastersurface, respectively.D TE M P(2)Increment in temperature at the point on the slave surface and the opposing master surface,respectively.P R E D E F(2,N P R E D)An array containing pairs of values of all the predefined field variables at the end of the currentincrement (initial values at the beginning of the analysis and current values during the analysis). The first value in a pair, P R E D E F(1,N P R E D), corresponds to the value at the point on the slave surface, and the second value, P F R E D E F(2,N P R E D), corresponds to the value of the field variable at the nearest point on the opposing surface.D P RE D(2,N P R E D)Array of increments in predefined field variables.T I M E(1)Value of step time at the end of the increment.T I M E(2)Value of total time at the end of the increment.D T I M ECurrent increment in time.F R E Q RCurrent frequency for direct steady-state dynamic analysis in rad/time.C I N A M EUser-specified surface interaction name, left justified.S L N A M ESlave surface name.M S N A M EMaster surface name.P R O P S(N P R O P S)User-specified array of property values to define the interfacial constitutive behavior between thecontacting surfaces.C O O RD S(M C R D)An array containing the current coordinates of this point.A L O C A L D I R(3,3)An array containing the direction cosines of the local surface coordinate system. The directions are stored in columns. For example, A L O C A L D I R(1,1), A L O C A L D I R(2,1), and A L O C A L D I R(3,1)give the (1, 2, 3) components of the normal direction. Thus, the first direction is the normal direction to the surface, and the remaining two directions are the slip directions in the plane of the surface. The local system is defined by the geometry of the master surface. The convention for the local directions is the same as the convention in situations where the model uses the built-in contact capabilities inAbaqus/Standard (described in“Contact formulations in Abaqus/Standard,” Section 37.1.1 of the Abaqus Analysis User's Manual, for the tangential directions).D R O T(2,2)Rotation increment matrix. For contact with a three-dimensional rigid surface, this matrix represents the incremental rotation of the surface directions relative to the rigid surface. It is provided so that vector-or tensor-valued state variables can be rotated appropriately in this subroutine. Relative displacement components are already rotated by this amount before U I N T E R is called. This matrix is passed in as a unit matrix for two-dimensional and axisymmetric contact problems.A R E ASurface area associated with the contact point.C H R L N G T HCharacteristic contact surface face dimension.N O D EUser-defined global slave node number (or internal node number for models defined in terms of an assembly of part instances) involved with this contact point. Corresponds to the predominant slave node of the constraint if the surface-to-surface contact formulation is used.N D I RNumber of force components at this point.N S T A T VNumber of solution-dependent state variables.N P R E DNumber of predefined field variables.N P R O P SUser-defined number of property values associated with this interfacial constitutive model (“Interfacial constants” in “User-defined interfacial constitutive behavior,” Section 36.1.6 of the Abaqus Analysis User's Manual).M C R DNumber of coordinate directions at the contact point.K S T E PStep number.K I N CIncrement number.K I TIteration number. K I T=0 for the first assembly, K I T=1 for the first recovery/second assembly,K I T=2 for the second recovery/third assembly, and so on.L I N P E RLinear perturbation flag. L I N P E R=1 if the step is a linear perturbation step. L I N P E R=0 if the step is a general step. For a linear perturbation step, the inputs to user subroutine U I N T E R represent perturbation quantities about the base state. The user-defined quantities in U I N T E R are also perturbation quantities.The Jacobian terms should be based on the base state. No change in contact status should occurduring a linear perturbation step.L P R I N TThis flag is equal to 1 if a detailed contact printout to the message file is requested and 0 otherwise (“The Abaqus/Standard message file” in “Output,” Section 4.1.1 of the Abaqus Analysis User'sManual). This flag can be used to print out diagnostic messages regarding changes in contact statusselectively only when a detailed contact printout is requested.。

ABAQUS用户子程序

ABAQUS用户子程序ABAQUS用户子程序ABAQUS/Standard subroutines：1.CREEP: Define time-dependent, viscoplastic behavior (creep and swelling).定义和时间相关的、粘塑性的运动（蠕变和膨胀）2. DFLOW: Define nonuniform pore fluid velocity in a consolidation analysis.在压实分析中，定义非均匀孔隙流速度3. DFLUX: Define nonuniform distributed flux in a heat transfer or mass diffusion analysis.在热传递和质量扩散分析中，定义非均匀的分布流量4. DISP: Specify prescribed boundary conditions.指定规定的边界条件5. DLOAD: Specify nonuniform distributed loads.指定非均匀的分布荷载6. FILM: Define nonuniform film coefficient and associated sink temperatures for heat transfer analysis.对热传递分析指定非均匀的膜层散热系数和联合的散热器温度7. FLOW: Define nonuniform seepage coefficient and associated sink pore pressure for consolidation analysis.对压实分析定义非均匀的渗流系数和渗入孔隙压力8. FRIC: Define frictional behavior for contact surfaces.对接触面定义摩擦9. GAPCON: Define conductance between contact surfaces or nodes in a fully coupled temperature-displacement analysis or pure heat transfer analysis.在一个完全耦合的温度—置换分析或者是纯热传递分析中，定义接触面或节点间的导热系数。

abaqus2用户单元子程序

20 ABAQUS用户单元子程序(UEL)在这一章中将列举两个在这些年里发展过的ABAQUS/Standard用户单元子程序（UEL）。

第一个例子是一个非线性的索单元，我们的目的是通过这个比较简单的例子让读者了解用户单元子程序的基本开发过程；第二个例子是一个用于计算应变梯度理论的单元，应变梯度是当今比较热点的一个科研前沿问题，有各种理论，我们为了验证新的理论，需要数值结果与实验对照来进行评价，整个例子的目的是通过它说明用户子单元可以求解的问题范围很广，但是由于内容比较艰深，程序也很长，所以这个例子我们并没有给出最后的全部程序。

另外，到目前为止，ABAQUS还只有隐式求解器ABAQUS/Standard支持用户自定义单元，而显式求解器ABAQUS/Explicit中还不支持这一功能。

20.1 非线性索单元20.1.1 背景钢索斜拉桥和斜拉索结构广泛应用于土木工程建筑上。

索力的计算分析是设计和施工的关键环节。

清华大学工程力学系在采用ABAQUS进行荆沙长江斜拉桥的计算机仿真分析（这个项目我们已在第15章“ABAQUS在土木工程中的应用（一）——荆州长江大桥南汊斜拉桥结构三维仿真分析”中讨论过）时，也曾进行了自行建立索单元的尝试。

本节介绍的就是这方面的工作。

香港理工大学土木与结构工程系采用ABAQUS有限元软件进行计算，完成了香港Ting Kau斜拉桥和Tsing Ma悬索桥的结构计算和分析。

对于钢索计算，他们采用梁单元进行模拟。

由于梁单元含有弯曲刚度，计算的高阶频率值偏高，周期较低。

一般假设索是单向受拉力的构件。

随着应变的非线性增加，索力呈非线性增加。

尽管ABAQUS单元库中有500个以上的单元类型，但是，还没有索单元。

本文发展了三维非线性索单元模型，形成ABAQUS的用户单元子程序，可以利用ABAQUS输入文件调入到具体的分析中。

通过静态和动态例题的计算比较，索单元工作良好。

20.1.2 基本公式在三维索单元计算中，如图20-1所示，坐标x 和位移u 的变量表达式为：ij ji i j ji u u u x x x -=-= (x,y,z) (u,v,w) (20-1)应变的公式为：()⎥⎦⎤⎢⎣⎡+++++=222211ji ji ji ji ji ji ji ji ji w v u w z v y u x L ε (20-2)公式（20-2）中，L 为索的长度，索的张力为：0N AE N +=ε(20-3)在公式（20-3）中，A 为截面面积，E 为弹性模量，N 0为初始张力。

ABAQUS用户子程序小例子

实例：最简单的杆件单轴拉伸，材料本构模型采用线弹性模型，E＝206000MPa, ν=0.3。

左端约束，右端施加均布力q=1。

Author: xueweek 希望这个小例子能帮助初学者减少一两天的摸索时间1 材料本构模型：σ=Eε在Property 中定义材料时，在General 下选中User Material，输入206000，0.3。

以上两个数值代表E、ν，在用户子程序中代表着PROPS(1)、PROPS(2)。

然后在General下选中Depvar，由于该例子中没有使用状态变量，因此在第一项中输入大于0 的数值即可。

建模大家都会，故省略2 ABAQUS 调用用户子程序大家在论坛上也可以看到很多方法，我这里指介绍最简单的一种。

在Job Manager 中点击Edit 选项，在General 选项的最后一项中选择自己建立好的用户子程序文件。

（注：用户子程序文件可以使用文本编辑器进行编辑，当然也可以用Fortran编译器，如果对自己的用户子程序文件的语法不放心，可以先用Fortan 编译器进行编译，不过编译前要先建立Project，关于Fortran 编译，这里不再介绍）。

完成后，点击submit 即可进行分析。

3 结果以下两张图分布是用户子程序和ABAQUS 自带的材料模型得到的应力云图，可以看出两种图形完全相同。

4 UMAT 子程序对于初学者来说，需要注意的是，FORTRAN 对于程序语言格式上的要求。

例如，对于FORTRAN 语言，前六个字符必须空出来，等等。

检查语法最好的方法就是在FORTRAN 编译器上进行编译。

SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD,RPL,DDSDDT,1 DRPLDE,DRPLDT,STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED,2 CMNAME,NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT,3 PNEWDT,CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,KSTEP,KINC)include 'aba_param.inc'CHARACTER*8 CMNAMEDIMENSION STRESS(NTENS),STATEV(NSTATV),DDSDDE(NTENS,NTENS),1 DDSDDT(NTENS),DRPLDE(NTENS),STRAN(NTENS),DSTRAN(NTENS),2 TIME(2),PREDEF(1),DPRED(1),PROPS(NPROPS),COORDS(3),DROT(3,3),3 DFGRD0(3,3),DFGRD1(3,3)C UMAT FOR ISOTROPIC ELASTICITYC CANNOT BE USED FOR PLANE STRESSC ----------------------------------------------------------------C PROPS(1) - EC PROPS(2) - NUC ----------------------------------------------------------------CIF (NDI.NE.3) THENWRITE (6,*) 'THIS UMAT MAY ONLY BE USED FOR ELEMENTS1 WITH THREE DIRECT STRESS COMPONENTS'CALL XITENDIFCC ELASTIC PROPERTIESEMOD=PROPS(1)ENU=PROPS(2)EBULK3=EMOD/(1-2*ENU)EG2=EMOD/(1+ENU)EG=EG2/2EG3=3*EGELAM=(EBULK3-EG2)/3CC ELASTIC STIFFNESSCDO K1=1, NDIDO K2=1, NDIDDSDDE(K2, K1)=ELAMEND DODDSDDE(K1, K1)=EG2+ELAMEND DODO K1=NDI+1, NTENSDDSDDE(K1 ,K1)=EGEND DOCC CALCULATE STRESSCDO K1=1, NTENSDO K2=1, NTENSSTRESS(K2)=STRESS(K2)+DDSDDE(K2, K1)*DSTRAN(K1)END DOEND DOCRETURNEND5 INP 输入文件*Heading** Job name: Job-1 Model name: Model-1 ** Generated by:Abaqus/CAE 6.10-1*Preprint, echo=NO, model=NO, history=NO, contact=NO **** PARTS ***Part, name=Part-1*End Part****** A SSEMBLY ***Assembly, name=Assembly ***Instance, name=Part-1-1, part=Part-1 *Node1, 0.0399999991, 0.0399999991, 0.4000000062, 0.0399999991, 0.029*******, 0.4000000063, 0.0399999991, 0.0199999996, 0.4000000064, 0.0399999991, 0.00999999978, 0.4000000065, 0.0399999991, 0., 0.4000000066, 0.0399999991, 0.0399999991, 0.3899999867, 0.0399999991, 0.029*******, 0.3899999868, 0.0399999991, 0.0199999996, 0.3899999869, 0.0399999991, 0.00999999978, 0.38999998610, 0.0399999991, 0., 0.38999998611, 0.0399999991, 0.0399999991, 0.37999999512, 0.0399999991, 0.029*******, 0.37999999513, 0.0399999991, 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ABAQUS用户子程序学习小结

1。

1 FORTRAN语言不区分大小写，文件扩展名为for，正文从第7列开始，第1～5列是标号区,第六列是续行标志区.1.2 FORTRAN语言中的“I-N规则”：I、J、K、L、M、N开头的为整型变量,其他开头为实型变量;2 DIMENSION COORDS(3）表示声明一个含3个元素的数组，下标分别为1、2、3，访问形式为COORDS（n），n为1～3;3 子程序(*。

for）文件中如何输出调试信息：WRITE(6，*)’COORDS(1)’,COORDS（1)，在＊。

dat文件中可看到输出，如果希望WRITE输出到msg文件中，则写为WRITE（7，*）'COORDS..。

；4 用户子程序DLOAD中COORDS数组的含义：COORDS(1)也是一个数组，存贮单元集合中所有单元积分点的X坐标，COORDS（2）存贮Y坐标,相应INP文件中的写法为：*DLOADPY,PYNU其中PY为单元集合名称,定义方法为:*Elset, elset=BEAM，generate1，5, 1。

.*ELSET,ELSET=PYBEAM5 DLOAD中F的定义方法:F只有定义在单元积分点上才有效，例如：F=1.0*COORDS (1)附一个简单实例：beam.inp文件:*Heading＊＊Job name：Job—1 Model name：beam*Preprint，echo=NO，model=NO，history=NO，contact=NO＊**＊PARTS*＊*Part, name=PART—1＊End Part＊*＊＊ASSEMBLY＊*＊Assembly, name=Assembly＊**Instance，name=PART-1-1, part=PART-1＊Node1, 0., 0。

2，20.，0.3, 40。

，0。

4, 60., 0.5，80。

, 0.6，100.，0.*Element，type=B311, 1, 22, 2，33, 3, 44, 4，55, 5，6*Elset，elset=BEAM, generate1, 5, 1＊＊Region：(Section—1-BEAM：BEAM), （Beam Orientation:BEAM）*＊Section：Section—1-BEAM Profile：Profile-1＊Beam Section，elset=BEAM，material=STEEL，temperature=GRADIENTS, section=RECT 0.2, 5.0。

ABAQUS材料用户子程序UMAT学习报告

具有友好的用户界面和易用的操作流程，方便用户进行学习和使用
UMAT子程序简介
UMAT子程序是 ABAQUS材料用户自定义模块，允许用户根据实际需求编写材料本构模型。
UMAT子程序采用C 语言编写，用户需要具备一定的编程基础。
UMAT子程序可以实现多种材料本构模型，如弹性、塑性、蠕变等。
UMAT子程序实现细节
编程语言和接口
A B A Q U S 材料用户子程序 U M AT 使用Fortran语言编写
U M AT 子程序中可以定义材料属性、本构关系等
添加标题
添加标题
添加标题
添加标题
U M AT 子程序通过 A B A Q U S 提供的接口与主程序进行交互
不足：使用门槛较高，需要用户具备一定的编程基础
未来展望：期待更多的用户参与开发，不断完善子程序功能
总结：UMAT子程序为用户提供了强大的材料模型描述能力，但使用过程中需要注意其局限性
在ABAQUS中的未来发展方向
开发更高效的材料模型集成人工智能和机器学习技术增强与CAD软件的集成扩展对多物理场模拟的支持
适用于金属材料
适用于复合材料
适用于橡胶材料
适用于陶瓷材料
参数的合理选择
参数选择需符合实际物理模型参数选择需考虑材料特性参数选择需经过实验验证参数选择需注意收敛性和稳定性
收敛性和稳定性问题
收敛性： U M AT 子程序在迭代过程中应满足收敛条件，否则可能导致计算失败或结果不准确。
边界条件和初始条件
边界条件：描述模型在边界上的行为，如位移、速度等初始条件：描述模型在初始时刻的状态，如温度、压力等

abaqus 子程序简单案例

abaqus 子程序简单案例1. 案例一：ABAQUS子程序在计算机辅助工程中的应用在计算机辅助工程中，ABAQUS子程序是一种被广泛应用的工具，用于求解各种复杂的物理问题。

它可以在ABAQUS有限元软件中调用，通过编写用户自定义的子程序来实现特定的功能。

下面将介绍一些常见的ABAQUS子程序案例。

2. 案例二：ABAQUS子程序在材料力学中的应用ABAQUS子程序在材料力学中的应用非常广泛。

例如，可以通过自定义的子程序来模拟材料的非线性行为、塑性变形、断裂行为等。

通过在子程序中编写相应的材料本构模型和损伤模型，可以准确地预测材料的力学性能。

3. 案例三：ABAQUS子程序在流体力学中的应用ABAQUS子程序在流体力学中也有重要的应用。

例如，可以通过自定义的子程序来模拟流体的非牛顿性、多相流动、湍流等现象。

通过在子程序中编写相应的流体本构模型和湍流模型，可以准确地模拟流体的流动行为。

4. 案例四：ABAQUS子程序在结构力学中的应用ABAQUS子程序在结构力学中也非常有用。

例如，可以通过自定义的子程序来模拟结构的非线性行为、接触和摩擦、动力响应等。

通过在子程序中编写相应的结构本构模型和接触模型，可以准确地预测结构的力学性能。

5. 案例五：ABAQUS子程序在热传导中的应用ABAQUS子程序在热传导中的应用也非常广泛。

例如，可以通过自定义的子程序来模拟材料的热传导行为、热辐射、相变等。

通过在子程序中编写相应的热传导模型和相变模型，可以准确地预测材料的热学性能。

6. 案例六：ABAQUS子程序在电磁场中的应用ABAQUS子程序在电磁场中的应用也有一定的研究价值。

例如，可以通过自定义的子程序来模拟电磁场的非线性行为、磁饱和、电磁感应等。

通过在子程序中编写相应的电磁场模型和电磁感应模型，可以准确地模拟电磁场的行为。

7. 案例七：ABAQUS子程序在声学中的应用ABAQUS子程序在声学领域中也有一定的应用。

Abaqus材料用户子程序UMAT基础知识及手册例子完整解释

1、为何需要使用用户材料子程序（User-Defined Material, UMAT ）？很简单，当ABAQUS 没有提供我们需要的材料模型时。

所以，在决定自己定义一种新的材料模型之前，最好对ABAQUS 已经提供的模型心中有数，并且尽量使用现有的模型，因为这些模型已经经过详细的验证，并被广泛接受。

UMAT 子程序具有强大的功能，使用UMAT 子程序：(1)可以定义材料的本构关系，使用ABAQUS 材料库中没有包含的材料进行计算，扩充程序功能。

(2) 几乎可以用于力学行为分析的任何分析过程，几乎可以把用户材料属性赋予ABAQU S 中的任何单元。

(3) 必须在UMAT 中提供材料本构模型的雅可比（Jacobian ）矩阵，即应力增量对应变增量的变化率。

(4) 可以和用户子程序“USDFLD ”联合使用，通过“USDFLD ”重新定义单元每一物质点上传递到UMAT 中场变量的数值。

2、需要哪些基础知识？先看一下ABAQUS 手册（ABAQUS Analysis User's Manual ）里的一段话：Warning: The use of this option generally requires considerable expertise(一定的专业知识). The user is cautioned that the implementation （实现） of any realistic constitutive （基本） model requires extensive （广泛的） development and testing. Initial testing on a single eleme nt model with prescribed traction loading （指定拉伸载荷） is strongly recommended. 但这并不意味着非力学专业，或者力学基础知识不很丰富者就只能望洋兴叹，因为我们的任务不是开发一套完整的有限元软件，而只是提供一个描述材料力学性能的本构方程（Constitutive equation ）而已。

浅谈ABAQUS用户子程序

这些用户子程序接口使用户解决一些问题时有很大的灵活性，同时大大的扩充了ABAQUS的功能。

例如：如果荷载条件是时间的函数，这在ABAQUS/CAE 和INPUT 文件中是难以实现的，但在用户子程序DLOAD中就很容易实现。

二．在ABAQUS中使用用户子程序ABAQUS的用户子程序是根据ABAQUS提供的相应接口，按照FORTRAN语法用户自己编写的代码。

在一个算例中，用户可以用到多个用户子程序，但必须把它们放在一个以.FOR为扩展名的文件中。

即任何用户子程序都不能调用任何其他用户子程Home序，但可以调用用户自己编写的FORTRAN子程序和ABAQUS应用程序。

ABAQUS用户子程序学习小结

ABAQUS用户子程序学习小结1 FORTRAN语言中的“I-N规则”:I、J、K、L、M、N开头的为整型变量，其他开头为实型变量;1.1 Fortran书写格式:1-5列:标号区;6列:续写标号区，一般就写"1";7-72列:语句区，本区内空格无效;注释行以C开头，本行内书写格式无要求;参考周煦《FORTRAN77结构化程序设计》，中国科学技术出版社，1995，38-40页 2 DIMENSION COORDS(3)表示声明一个含3个元素的数组，下标分别为1、2、3，访问形式为COORDS(n)，n为1,3;3 子程序(*.for)文件中如何输出调试信息:WRITE(6,*)'COORDS(1)',COORDS(1)，在*.dat文件中可看到输出，如果希望WRITE输出到msg文件中，则写为WRITE(7,*)'COORDS...;4 用户子程序DLOAD中COORDS数组的含义:COORDS(1)也是一个数组，存贮单元集合中所有单元积分点的X坐标，COORDS(2)存贮Y坐标，相应INP文件中的写法为:*DLOADPY,PYNU其中PY为单元集合名称，定义方法为:*Elset, elset=BEAM, generate1, 5, 1...*ELSET,ELSET=PYBEAM5 DLOAD中F的定义方法:F只有定义在单元积分点上才有效，例如:F=1.0*COORDS (1)附一个简单实例:beam.inp文件:*Heading** Job name: Job-1 Model name: beam *Preprint, echo=NO, model=NO, history=NO, contact=NO**** PARTS***Part, name=PART-1*End Part**** ASSEMBLY***Assembly, name=Assembly***Instance, name=PART-1-1, part=PART-1 *Node1, 0., 0.2, 20., 0.3, 40., 0.4, 60., 0.5, 80., 0.6, 100., 0. *Element, type=B311, 1, 22, 2, 33, 3, 44, 4, 55, 5, 6*Elset, elset=BEAM, generate1, 5, 1** Region: (Section-1-BEAM:BEAM), (Beam Orientation:BEAM)** Section: Section-1-BEAM Profile: Profile-1*Beam Section, elset=BEAM, material=STEEL, temperature=GRADIENTS, section=RECT0.2, 5.0.,0.,-1.*End Instance*Nset, nset=ENDS, instance=PART-1-11, 6*Nset, nset=_M4, internal, instance=PART-1-16,*Nset, nset=_M5, internal, instance=PART-1-11,*End Assembly**** MATERIALS***Material, name=STEEL*Elastic210000., 0.3*ELSET,ELSET=PYBEAM**** BOUNDARY CONDITIONS**** Name: Disp-BC-1 Type: Symmetry/Antisymmetry/Encastre*Boundary_M4, ENCASTRE** ---------------------------------------------------------------- **** STEP: Step-1***Step, name=Step-1*Static**** LOADS**** Name: CFORCE-1 Type: Concentrated force*DLOADPY,PYNU**** OUTPUT REQUESTS****** FIELD OUTPUT: F-Output-1 ***Output, field, variable=PRESELECT **** FIELD OUTPUT: F-Output-2 ***Output, field*Element OutputSF,**** HISTORY OUTPUT: H-Output-1 ***Output, history*Node Output, nset=ENDSCF1, CF2, CF3, CM1, CM2, CM3, RF1, RF2 RF3, RM1, RM2, RM3, U1, U2, U3, UR1 UR2, UR3*El Print, freq=999999*Node Print, freq=999999*End Stepbbb.for文件SUBROUTINE DLOAD(F,KSTEP,KINC,TIME,NOEL,NPT,LAYER,KSPT,COORDS,1 JLTYP,SNAME) CINCLUDE 'ABA_PARAM.INC'CDIMENSION TIME(2), COORDS (3)CHARACTER*80 SNAMEWRITE(6,*)'COORDS(3)',COORDS(3)F=1.0*COORDS (1)RETURNEND运行方法:在Abaqus Command提示符后输入:abaqus job=beam user=bbb interactive 子程序如下～如何编写，调研子程序,子程序USDFLD中给固化度赋了一个初值1×10-4。

Abaqus材料用户子程序UMAT基础知识及手册例子完整解释

1、为何需要使用用户材料子程序（User-Defined Material, UMAT ）？很简单，当ABAQUS 没有提供我们需要的材料模型时。

UMAT 子程序具有强大的功能，使用UMAT 子程序：(1)可以定义材料的本构关系，使用ABAQUS 材料库中没有包含的材料进行计算，扩充程序功能。

(2) 几乎可以用于力学行为分析的任何分析过程，几乎可以把用户材料属性赋予ABAQU S 中的任何单元。

(3) 必须在UMAT 中提供材料本构模型的雅可比（Jacobian ）矩阵，即应力增量对应变增量的变化率。

(4) 可以和用户子程序“USDFLD ”联合使用，通过“USDFLD ”重新定义单元每一物质点上传递到UMAT 中场变量的数值。

21ABAQUS用户材料子程序_1502407

21 ABAQUS用户材料子程序(UMAT)虽然ABAQUS为用户提供了大量的单元库和求解模型，使用户能够利用这些模型处理绝大多数的问题；但是实际问题毕竟非常复杂，ABAQUS不可能直接求解所有可能出现的问题。

所以ABAQUS提供了大量的用户自定义子程序（User Subroutine），允许用户在找不到合适模型的情况下自行定义符合自己问题的模型。

这些用户子程序涵盖了建模、载荷到单元的几乎各个部分。

用户子程序具有以下的功能和特点：（1）如果ABAQUS的一些固有选项模型功能有限，用户子程序可以提高ABAQUS中这些选项的功能；（2）通常用户子程序是用FORTRAN语言的代码写成；（3）它可以以几种不同的方式包含在模型中；（4）由于它们没有存储在restart文件中，如果需要的话，可以在重新开始运行时修改它；（5）在某些情况下它可以利用ABAQUS允许的已有程序。

要在模型中包含用户子程序，可以利用ABAQUS执行程序，在执行程序中应用user 选项指明包含这些子程序的FORTRAN源程序或者目标程序的名字。

提示：ABAQUS的输入文件除了可以通过ABAQUS/CAE的作业模块中提交运行外，还可以在ABAQUS Command窗口中输入ABAQUS执行程序直接运行：ABAQUS job=输入文件名 user=用户子程序的Fortran文件名ABAQUS/Standard和ABAQUS/Explicit都支持用户子程序功能，但是他们所支持的用户子程序种类不尽相同，读者在需要使用时请注意查询手册。

在接下来的两章里，我们将讨论两种常用的用户子程序——用户材料子程序和用户单元子程序。

本章将通过在ABAQUS/Standard中创建Johnson-Cook的材料模型，介绍编写ABAQUS/Standard的用户材料子程序UMAT。

在ABAQUS/Explicit中编写用户材料子程序VUMAT与之相似，但是由于隐式和显式两种方法本身的差异，它们之间也有一些不同，请读者在具体使用前仔细查阅ABAQUS手册中的相关内容。

ABAQUS子程序

ABAQUS用户子程序当用到某个用户子程序时，用户所关心的主要有两方面：一是ABAQUS提供的用户子程序的接口参数。

有些参数是ABAQUS传到用户子程序中的，例如SUBROUTINE DLOAD中的KSTEP，KINC，COORDS；有些是需要用户自己定义的，例如F。

二是ABAQUS何时调用该用户子程序，对于不同的用户子程序ABAQUS调用的时间是不同的。

有些是在每个STEP的开始，有的是STEP结尾，有的是在每个INCREMENT的开始等等。

当ABAQUS调用用户子程序是，都会把当前的STEP和INCREMENT利用用户子程序的两个实参KSTEP和KINC传给用户子程序，用户可编个小程序把它们输出到外部文件中，这样对ABAQUS何时调用该用户子程序就会有更深的了解。

（子程序中很重要的就是要知道由abaqus提供的那些参量的意义，如下）首先介绍几个子程序：一．SUBROUTINE DLOAD(F,KSTEP,KINC,TIME,NOEL,NPT,LAYER,KSPT,COORDS, JLTYP,SNAME)参数：1．F为用户定义的是每个积分点所作用的荷载的大小；2．KSTEP,KINC为ABAQUS传到用户子程序当前的STEP和INCREMENT值；3．TIME(1),TIME(2)为当前STEP TIME和INCREMENT TIME的值；4．NOEL,NPT为积分点所在单元的编号和积分点的编号；5．COORDS为当前积分点的坐标；6．除F外，所有参数的值都是ABAQUS传到用户子程序中的。

功能：1．荷载可以被定义为积分点坐标、时间、单元编号和单元节点编号的函数。

2．用户可以从其他程序的结果文件中进行相关操作来定义积分点F的大小。

例1：这个例子在每个积分点施加的荷载不仅是坐标的函数，而且是随STEP变化而变化的。

SUBROUTINE DLOAD(P,KSTEP,KINC,TIME,NOEL,NPT,LAYER,KSPT,COORDS,1 JLTYP,SNAME)INCLUDE 'ABA_PARAM.INC' CDIMENSION TIME(2),COORDS(3)CHARACTER*80 SNAMEPARAMETER (PLOAD=100.E4)IF (KSTEP.EQ.1) THEN ！当STEP=1时的荷载大小P=PLOADELSE IF (KSTEP.EQ.2) THEN ！当STEP＝2时的荷载大小P=COORDS(1)*PLOAD ！施加在积分点的荷载P是坐标的函数ELSE IF (KSTEP.EQ.3) THEN ！当STEP=3时的荷载大小P=COORDS(1)**2*PLOADELSE IF (KSTEP.EQ.4) THEN ！当STEP=4时的荷载大小P=COORDS(1)**3*PLOADELSE IF (KSTEP.EQ.5) THEN ！当STEP=5时的荷载大小P=COORDS(1)**4*PLOADEND IFRETURNENDUMAT 子程序具有强大的功能，使用UMAT 子程序：(1) 可以定义材料的本构关系，使用ABAQUS 材料库中没有包含的材料进行计算，扩充程序功能。

ABAQUS初学者用户子程序小例子

实例：最简单的杆件单轴拉伸，材料本构模型采用线弹性模型，E＝206000MPa, ν=0.3。

左端约束，右端施加均布力q=1。

Author: xueweek希望这个小例子能帮助初学者减少一两天的摸索时间1材料本构模型：σ=Eε在Property中定义材料时，在General下选中User Material，输入206000，0.3。

以上两个数值代表E、ν，在用户子程序中代表着PROPS(1)、PROPS(2)。

然后在General 下选中Depvar，由于该例子中没有使用状态变量，因此在第一项中输入大于0的数值即可。

建模大家都会，故省略2ABAQUS调用用户子程序大家在论坛上也可以看到很多方法，我这里指介绍最简单的一种。

在Job Manager中点击Edit选项，在General选项的最后一项中选择自己建立好的用户子程序文件。

（注：用户子程序文件可以使用文本编辑器进行编辑，当然也可以用Fortran 编译器，如果对自己的用户子程序文件的语法不放心，可以先用Fortan编译器进行编译，不过编译前要先建立Project，关于Fortran编译，这里不再介绍）。

完成后，点击submit即可进行分析。

3结果以下两张图分布是用户子程序和ABAQUS自带的材料模型得到的应力云图，可以看出两种图形完全相同。

4UMAT子程序对于初学者来说，需要注意的是，FORTRAN对于程序语言格式上的要求。

例如，对于FORTRAN语言，前六个字符必须空出来，等等。

检查语法最好的方法就是在FORTRAN编译器上进行编译。

SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD,RPL,DDSDDT,1 DRPLDE,DRPLDT,STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED,2 CMNAME,NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT,3 PNEWDT,CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,KSTEP,KINC)include 'aba_param.inc'CHARACTER*8 CMNAMEDIMENSION STRESS(NTENS),STATEV(NSTATV),DDSDDE(NTENS,NTENS),1 DDSDDT(NTENS),DRPLDE(NTENS),STRAN(NTENS),DSTRAN(NTENS),2 TIME(2),PREDEF(1),DPRED(1),PROPS(NPROPS),COORDS(3),DROT(3,3),3 DFGRD0(3,3),DFGRD1(3,3)C UMAT FOR ISOTROPIC ELASTICITYC CANNOT BE USED FOR PLANE STRESSC ----------------------------------------------------------------C PROPS(1) - EC PROPS(2) - NUC ----------------------------------------------------------------IF (NDI.NE.3) THENWRITE (6,*) 'THIS UMAT MAY ONLY BE USED FOR ELEMENTS 1 WITH THREE DIRECT STRESS COMPONENTS'CALL XITENDIFCC ELASTIC PROPERTIESEMOD=PROPS(1)ENU=PROPS(2)EBULK3=EMOD/(1-2*ENU)EG2=EMOD/(1+ENU)EG=EG2/2EG3=3*EGELAM=(EBULK3-EG2)/3CC ELASTIC STIFFNESSCDO K1=1, NDIDO K2=1, NDIDDSDDE(K2, K1)=ELAMEND DODDSDDE(K1, K1)=EG2+ELAMEND DODO K1=NDI+1, NTENSDDSDDE(K1 ,K1)=EGEND DOCC CALCULATE STRESSCDO K1=1, NTENSDO K2=1, NTENSSTRESS(K2)=STRESS(K2)+DDSDDE(K2, K1)*DSTRAN(K1)END DOEND DOCRETURNEND5INP输入文件*Heading** Job name: Job-1 Model name: Model-1** Generated by: Abaqus/CAE 6.10-1*Preprint, echo=NO, model=NO, history=NO, contact=NO**** PARTS***Part, name=Part-1*End Part****** ASSEMBLY***Assembly, name=Assembly***Instance, name=Part-1-1, part=Part-1*Node1, 0.0399999991, 0.0399999991, 0.400000006 2, 0.0399999991, 0.029*******, 0.400000006 3, 0.0399999991, 0.0199999996, 0.400000006 4, 0.0399999991, 0.00999999978, 0.400000006 5, 0.0399999991, 0., 0.400000006 6, 0.0399999991, 0.0399999991, 0.389999986 7, 0.0399999991, 0.029*******, 0.389999986 8, 0.0399999991, 0.0199999996, 0.389999986 9, 0.0399999991, 0.00999999978, 0.389999986 10, 0.0399999991, 0., 0.389999986 11, 0.0399999991, 0.0399999991, 0.379999995 12, 0.0399999991, 0.029*******, 0.379999995 13, 0.0399999991, 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ABAQUS用户材料子程序UMAT介绍

（一）UMAT简介
用户可以定义包括：边界条件、荷载条件、接触条件、材料特性以及利用用户子程序和其它应用软件进行数值交换等等。这些用户子程序接口使得用户解决一些问题时有很大的灵活性，同时大大的扩充了 ABAQUS 的功能。
（一）UMAT简介
通过用户材料子程序（User-defined Material Mechanical Behavior，简称UMAT）接口，用户可定义任何补充的材料模型，不但任意数量的材料常数都可以作为资料被读取，而且ABAQUS 对于任何数量的与解相关的状态变量在每一材料计数点都提供了存储功能，以便在这些子程序中应用。
（四）子程序的调用
将这两个文件拷贝到分析目录D:>Temp下，将子程序的后缀改为.for，然后在D:\Temp下面用运行在command中： abaqus job=your job name user=your umat

在cae中调用子程序可以采用以下方法：打开 job下面的edit菜单，点general，点击user subroutine后面的select，即可选择你所需要的用户子程序。

PROPS(NPROPS)材料常数矩阵，矩阵中元素的数值对应于关键字“*USER MATERIAL”下面的数据行。 SSE ， SPD ， SCD分别定义每一增量步的弹性应变能，塑性耗散和蠕变耗散。它们对计算结果没有影响，仅仅作为能量输出。
（三）编程思路
其他变量： STRAN ( NTENS ) ：应变矩阵； DSTRAN ( NTENS ) ：应变增量矩阵； DTIME ：增量步的时间增量； NDI ：直接应力分量的个数； NSHR ：剪切应力分量的个数； NTENS ：总应力分量的个数， NTENS = NDI + NSHR 。

abaqus2用户单元子程序

a b a q u s2用户单元子程序-CAL-FENGHAI.-(YICAI)-Company One120 ABAQUS用户单元子程序(UEL)在这一章中将列举两个在这些年里发展过的ABAQUS/Standard用户单元子程序（UEL）。

另外，到目前为止，ABAQUS还只有隐式求解器ABAQUS/Standard支持用户自定义单元，而显式求解器ABAQUS/Explicit中还不支持这一功能。

非线性索单元20.1.1 背景钢索斜拉桥和斜拉索结构广泛应用于土木工程建筑上。

索力的计算分析是设计和施工的关键环节。

本节介绍的就是这方面的工作。

香港理工大学土木与结构工程系采用ABAQUS有限元软件进行计算，完成了香港Ting Kau斜拉桥和Tsing Ma悬索桥的结构计算和分析。

对于钢索计算，他们采用梁单元进行模拟。

由于梁单元含有弯曲刚度，计算的高阶频率值偏高，周期较低。

一般假设索是单向受拉力的构件。

随着应变的非线性增加，索力呈非线性增加。

尽管ABAQUS单元库中有500个以上的单元类型，但是，还没有索单元。

本文发展了三维非线性索单元模型，形成ABAQUS的用户单元子程序，可以利用ABAQUS输入文件调入到具体的分析中。

ABAQUS材料用户子程序UMAT学习报告

NDI：某一点上直接应力组件数。 NSHR：某一点上剪切应力组件数。 NTENS：总应力分量个数，（=NDI+NSHR）。
NSTATV：存储与解有关的状态变量数组个数。 PROPS (NPROPS)：材料常数数组。 COORDS：当前积分点坐标。DROT(3,3) ：旋转增量矩阵。 CELENT：特征元素长度。
载入输入文件umat.inp，得到如下图形。
按下图所示操作载入umat.for子程序文件按下图所示创建作业（Job）
点一击段S时ub间m后it之，后结，果结如果下如图下所图示所。示。
最后查看可视化后处理，得到如下云图。
2、验证利用UMAT进行二次开发的实例
实例：最简单的杆件单轴拉伸，材料本构模型ARDMLO子A程D序；；特此殊外分，布读的取牵结
果引文力件的可U采T用RAUCRLODAFIDL ；子温程度序场。边界的 UTEMP 。
4、用户定义的单元
对于特殊类型的单元，可采用 UEL 子程序进行定义。
5、用户定义的材料特性和本构关系
几乎可以用于力学行为分析的任何分析过程，几乎可以把用户材料属性赋予 ABAQUS 中的任何单元。
必须在 UMAT 中提供材料本构的雅可比（ Jacobian）矩阵，即应力增量对应变增量的变化率。
2、UMAT书写格式
定义了一些相关参数与变量的精确度，从 ABAQUS 安装目录下可找到
UMAT 中的应力矩阵、应变矩阵以及矩阵 DDSDDE、 DDSDDT、 DRPLDE 等，都是直接分量存储在前，剪切分量存储在后。直接分量有 NDI 个，剪切分量有 NSHR 个。各分量之间的顺序根据单元自由度的不同有一些差异，所以编写 UMAT 时要考虑到所使用单元的类别。

ABAQUS用户材料子程序开发及应用

ABAQUS用户材料子程序开发及应用ABAQUS用户材料子程序开发及应用摘要：本文介绍了ABAQUS用户材料子程序的开发与应用。

首先，简要介绍了ABAQUS软件及其在工程领域的广泛应用。

然后，详细阐述了用户材料子程序的概念及作用，并介绍了子程序的开发流程和必要步骤。

接着，以一个具体的材料模型开发为例，详细介绍了子程序的实现方法和注意事项。

最后，以轴对称挤压模拟为例，展示了用户材料子程序在实际工程分析中的应用，并讨论了其优点和局限性。

关键词：ABAQUS；用户材料子程序；开发；应用一、引言ABAQUS是一款广泛应用于工程领域的有限元分析软件。

其强大的建模和分析能力使得工程师可以准确地模拟和分析各种结构和材料的行为。

然而，对于一些非标准材料或特殊材料，ABAQUS自带的材料模型可能无法满足工程师的需求。

此时，用户材料子程序的开发就显得尤为重要。

二、用户材料子程序的概念及作用用户材料子程序是指由ABAQUS用户自行编写的用于描述非标准材料行为的子程序。

它可以根据特定的材料性质和应变-应力关系，定义材料模型的行为，并将其与ABAQUS的有限元分析过程相结合。

通过用户材料子程序，工程师可以更加准确地模拟和分析特殊材料的行为，提高分析结果的可靠性和准确性。

三、用户材料子程序的开发流程和步骤用户材料子程序的开发包括以下几个基本步骤：1. 确定材料模型：根据实际需要和具体材料的性质，选择合适的材料模型。

常见的模型包括线弹性模型、塑性模型、粘弹性模型等。

2. 编写用户材料子程序：使用合适的编程语言（如Fortran）编写用户材料子程序，实现材料模型的行为。

子程序应包括材料刚度矩阵计算、应力和塑性应变更新等关键计算部分。

3. 软件接口设置：将编写好的用户材料子程序与ABAQUS 软件进行接口设置，以实现子程序与有限元分析的集成。

4. 验证与调试：使用合适的测试用例对子程序进行验证和调试，确保其计算结果与实际情况吻合。

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李青清华大学工程力学系摘要本文首先概要介绍了ABAQUS的用户子程序和应用程序，然后从参数，功能两方面详细论述了DLOAD, UEXTERNALDB, URDFIL三个用户子程序和GETENVVAR，POSFIL，DBFILE三个应用程序，并详细介绍了ABAQUS的结果文件（.FIL）存储格式。

这些用户子程序接口使用户解决一些问题时有很大的灵活性，同时大大的扩充了ABAQUS的功能。

例如：如果荷载条件是时间的函数，这在ABAQUS/CAE 和INPUT 文件中是难以实现的，但在用户子程序DLOAD中就很容易实现。

二．在ABAQUS中使用用户子程序ABAQUS的用户子程序是根据ABAQUS提供的相应接口，按照FORTRAN语法用户自己编写的代码。

在一个算例中，用户可以用到多个用户子程序，但必须把它们放在一个以.FOR为扩展名的文件中。

运行带有用户子程序的算例时有两种方法，一是在CAE中运行，在EDIT JOB菜单的GENERAL子菜单的USER SUBROUTINE FILE对话框中选择用户子程序所在的文件即可；另外是在ABABQUS COMMAND用运行，语法如下：Home序，但可以调用用户自己编写的FORTRAN子程序和ABAQUS应用程序。

当用户编写FORTRAN子程序时，建议子程序名以K开头，以免和ABAQUS内部程序冲突。

2．当用户在用户子程序中利用OPEN打开外部文件时，要注意以下两点：一是设备号的选择是有限制的，只能取15－18和大于100的设备号，其余的都已被ABAQUS占用。

二是用户需提供外部文件的绝对路径而不是相对路径。

3．ABAQUS 应用程序必须由用户子程序调用。

当用到某个用户子程序时，用户所关心的主要有两方面：一是ABAQUS提供的用户子程序的接口参数。

有些参数是ABAQUS传到用户子程序中的，例如SUBROUTINE DLOAD中的KSTEP，KINC，COORDS；有些是需要用户自己定义的，例如F。

二是ABAQUS何时调用该用户子程序，对于不同的用户子程序ABAQUS调用的时间是不同的。

有些是在每个STEP的开始，有的是STEP结尾，有的是在每个INCREMENT的开始等等。

下面就选出几个常用的用户子程序和应用程序进行详细解释：一．SUBROUTINEDLOAD(F,KSTEP,KINC,TIME,NOEL,NPT,LAYER,KSPT,COORDS,JLTYP,SNAME)参数：1．F为用户定义的是每个积分点所作用的荷载的大小；2．KSTEP,KINC为ABAQUS传到用户子程序当前的STEP和INCREMENT值；3．TIME(1),TIME(2)为当前STEP TIME和INCREMENT TIME的值；4．NOEL,NPT为积分点所在单元的编号和积分点的编号；5．COORDS为当前积分点的坐标；6．除F外，所有参数的值都是ABAQUS传到用户子程序中的。

功能：1．荷载可以被定义为积分点坐标、时间、单元编号和单元节点编号的函数。

Home2．用户可以从其他程序的结果文件中进行相关操作来定义积分点F的大小。

例1：这个例子在每个积分点施加的荷载不仅是坐标的函数，而且是随STEP变化而变化的。

SUBROUTINE DLOAD(P,KSTEP,KINC,TIME,NOEL,NPT,LAYER,KSPT,COORDS,1 JLTYP,SNAME)CINCLUDE 'ABA_PARAM.INC'CDIMENSION TIME(2),COORDS(3)CHARACTER*80 SNAMEPARAMETER (PLOAD=100.E4)CIF (KSTEP.EQ.1) THEN ！当STEP=1时的荷载大小P=PLOADELSE IF (KSTEP.EQ.2) THEN ！当STEP＝2时的荷载大小P=COORDS(1)*PLOAD ！施加在积分点的荷载P是坐标的函数ELSE IF (KSTEP.EQ.3) THEN ！当STEP=3时的荷载大小P=COORDS(1)**2*PLOADELSE IF (KSTEP.EQ.4) THEN ！当STEP=4时的荷载大小P=COORDS(1)**3*PLOADELSE IF (KSTEP.EQ.5) THEN ！当STEP=5时的荷载大小P=COORDS(1)**4*PLOADEND IFRETURNEND二．UBROUTINEUEXTERNALDB(LOP,LRESTART,TIME,DTIME,KSTEP,KINC)参数：用户可以利用LOP开关来控制自己的代码程序何时被ABAQUS调用。

LOP=0（3）表示在计算的开始（结束）ABAQUS调用此用户子程序；LOP=1 (2) 表示在每个INCREMENT的开始（结束）ABAQUS调用此用户子程序；LOP了＝4 表示在每个RESTART的开始ABAQUS调用此用户子程序。

这为用户子程序提供了很大的灵活性。

功能：1．可以用来和其它用户子程序及其它软件进行数据通讯。

2．可以用来在适当的时间打开，关闭外部文件。

3．用户可以把自己编写的ABAQUS扩充功能的程序代码通过此用户子程序嵌Home入到ABAQUS中。

例2．新建一个与JOB名相同但扩展名(.ALE)不同的文件，此用户子程序用到了GETENVVAR应用程序来获得ABAQUS的环境变量，用DMKNAME子程序来合成所需的文件名。

SUBROUTINE UEXTERNALDB(LOP,LRSTART,TIME,DTIME,KSTEP,KINC)INCLUDE 'ABA_PARAM.INC'CHARACTER XINDIR*255,XFNAME*80CHARACTER DMKNAME*255,FNAMEX*80CLXFNAME=0LXINDIR=0XFNAME =' 'XINDIR =' 'CALL GETENVVAR('FNAME',XFNAME,LXFNAME) !读取input文件名CALL GETENVVAR ('OUTDIR',XINDIR,LXINDIR) !读取input文件所在的路径IF(LOP.EQ.0) THENFNAMEX=DMKNAME(XFNAME(1:LXFNAME),XINDIR(1:LXINDIR), '.ALE')！生成所要新建文件的文件名OPEN(UNIT=17,FILE=FNAMEX,STATUS='UNKNOWN',FORM='FORMATTED')！打开文件WRITE(17,*)'Opening new user external file...'WRITE(17,*)'Writing dummy data to this file...'END IFRETURNENDcC COMPOSE A FILENAME DIRECTORY/JOBNAME.EXTENCHARACTER*(*) FUNCTION DMKNAME(FNAME,DNAME,EXTEN)CCHARACTER*(*) FNAME,DNAME,EXTENC FNAME I JOBNAMEC DNAME I DIRECTORYC EXTEN I EXTENSIONC DMKNAME O DIRECTORY/JOBNAME.EXTENLTOT = LEN(FNAME)LF = 0DO K1 = LTOT,2,-1HomeIF (LF.EQ.0.AND.FNAME(K1:K1).NE.' ') LF = K1END DOLTOT = LEN(DNAME)LD = 0DO K1 = LTOT,2,-1IF (LD.EQ.0.AND.DNAME(K1:K1).NE.' ') LD = K1END DOLTOT = LEN(EXTEN)LE = 0DO K1 = LTOT,2,-1IF (LE.EQ.0.AND.EXTEN(K1:K1).NE.' ') LE = K1END DOIF ((LF + LD + LE) .LE. LEN(DMKNAME)) THENDMKNAME = DNAME(1:LD)//FNAME(1:LF)LTOT = LD + LFIF ( LE.GT.0) THENDMKNAME = DMKNAME(1:LTOT)//EXTEN(1:LE)END IFEND IFCRETURNEND三．SUBROUTINE URDFIL (LSTOP,LOVRWRT,KSTEP,KINC,DTIME,TIME) 参数：1．LSTOP是决定ABAQUS分析是否继续的开关。

如果LSTOP=1，分析中止；否则，分析继续。

2．LOVRWRT是决定能否把上个INCREMENT的结果文件覆盖的开关。

LOVRWRT＝1，覆盖，这样可大大减少结果文件的大小；否则，不覆盖。

3．LSTEP和LOVRWRT参数是留给用户自己定义的，KSTEP,KINC,DTIME,TIME是ABAQUS传给用户子程序的参数。

功能：1．读结果文件（.FIL）中的数据。

2．利用LSTOP开关，用户可中止ABAQUS计算URDFIL要用到以下两个ABAQUS应用程序：POSFIL和DBFILECALL POSFIL (NSTEP,NINC,ARRAY,JRCD)Home参数：1. NSTEP和NINC的值都是由调用它的URDFIL用户子程序接口中的参数KSTEP和KINC传递下来。

2. ARRAY是用来存放RECORD 2000的值3. JRCD为返回值。

如果在结果文件中找到相应的STEP和INCREMENT,返回值为0；否则为1。

功能：如果用户想要对某个STEP中的某个INCREMENT的结果数据进行操作，POSFIL可定位用户想要进行操作的STEP和INCREMENT数据在结果文件中的位置。

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