AE3122 ABAQUS Lecture 1

ABAQUS/CAE®, provides a complete modeling and visualization environment for ABAQUS analysis products. With direct access to CAD models, advanced meshing and visualization, and with an exclusive view towards ABAQUS analysis products, ABAQUS/CAE is the modeling environment of choice for many ABAQUS users.
A truss problem
y, 2 20 in. 100 lbs
x, 1 20 in. Steel truss segments, Young’s modulus 30x106 lbs/in2 Diameter of each truss is 1 inch 200 lbs
Beam example
What is ABAQUS?
The ABAQUS suite of software for finite element analysis (FEA) is known for its high performance, quality and ability to solve more kinds of challenging simulations than any other software. The ABAQUS suite consists of three core products: ABAQUS/Standard, ABAQUS/Explicit and ABAQUS/CAE. Each of these packages offers additional optional modules that address specialized capabilities some customers may need.
To run ABAQUS
• At the command line
abaqus job=filename
Use the Input File filename WITHOUT the file extension (.inp)
The results
You will get many files after your job is complete. .dat Contains results information you can read. Very important for debugging. .fil Only for the computer .com Only for the computer .odb Only for the computer but will be used by CAE .msg Contains information you can read about how the job ran. Can be important for debugging. .prt Only for the computer .sta Contains information you can read about the status of the job while running .log Contains information you can read about how the job ran. Can be important for debugging.
ABAQUS documentation and online resources
• There are many online resources to help you find solutions. • ABAQUS Documentation http://www.isye.gatech.edu/v6.4 • Newsgroup sci.engr.analysis • ABAQUS Yahoo group • Engineering Computing Services http://www.ecs.gatech.edu
• I’ll pick T3D2 2-node linear displacement
Modal Section
*HEADING CANTILEVER BEAM ** ** This is in inches ** *NODE 1, 0., 0. 6, 100., 0. 7, 0., 20. 12, 100., 20. *NSET, NSET=FIXED 1, 7 *NGEN, NSET=allnodes 1, 6 7, 12 *ELEMENT, TYPE=T3D2, ELSET=BEAM 1, 1, 2 2, 2, 3 3, 3, 4 4, 4, 5 5, 5, 6 6, 7, 8 7, 8, 9 8, 9, 10 9, 10, 11 10, 11, 12 11, 1, 8 12, 2, 9 13, 3, 10 14, 4, 11 15, 5, 12 16, 6, 12 17, 2, 8 18, 3, 9 19, 4, 10 20, 5, 11 *SOLID SECTION, ELSET=BEAM, MATERIAL=STEEL 1., *MATERIAL, NAME=STEEL *ELASTIC 30.E6, *BOUNDARY FIXED, ENCASTRE
Simple Input file (History Section)
*STEP, PERTURBATION *STATIC ** ** The load is in pounds ** *CLOAD 6, 2, -20000. *EL PRINT, POSITION=AVERAGED AT NODES, SUMMARY=YES S11, E11 SF, *NODE FILE, NSET=allnodes U, CF, RF *OUTPUT, FIELD, VARIABLE=PRESELECT *ELEMENT OUTPUT SF, *OUTPUT, HISTORY *NODE OUTPUT, NSET=allnodes U, CF, RF *END STEP
•
Hale Waihona Puke Baidu
(From www.abaqus.com)
Why learn ABAQUS?
• Experience has shown that ABAQUS is the easiest FEA software package to learn. • Very good online documentation • Small learning curve which means you can model much faster.
AE3122 ABAQUS Lecture Part I
Patrick Roberts
gt0398b@prism.gatech.edu x5-2773 Weber 20X
Overview
• What is ABAQUS? • Why learn ABAQUS? • ABAQUS documentation and online resources • Solver structure • How to build a simple model
•
ABAQUS/Explicit®, provides ABAQUS analysis technology focused on transient dynamics and quasi-static analyses using an explicit approach appropriate in many applications such as drop test, crushing and many manufacturing processes.
I want to know stresses and strains in all truss segments due to the static loads shown in the figure.
Sketch out your FEA model
y, 2 7 6 8
7
12
9
8 13
10
9
11
Sketch out your FEA model
y, 2 20,000 lbs
1 1
2 2
3 3
4 4
5 5 6 x, 1
Nodes
Elements
Pick your elements
• ABAQUS has a large library of elements
(From ABAQUS documentation)
(From www.abaqus.com)
What is ABAQUS?
• ABAQUS/Standard®, provides ABAQUS analysis technology to solve traditional implicit finite element analyses, such as static, dynamics, thermal, all powered with the widest range of contact and nonlinear material options. ABAQUS/Standard also has optional add-on and interface products with address design sensitivity analysis, offshore engineering, and integration with third party software, e.g., plastic injection molding analysis.
10 15
12
11
17
14
19 20 4 4 5
16 x, 1
18 3
1
1
2
2
3
5
6
Steel truss segments, Young’s modulus 30x106 lbs/in2 Diameter of each truss is 1 inch
Pick your elements
(From ABAQUS documentation)
Solver Structure
Command line
ABAQUS CAE
Standard
How to build a simple model
• All models are called input files. • An input file has two sections; Model and History • The Model section contains all the information about the model and comes before the history section. • The History section is what you do to the model. You work on the model in Steps. • Input files have a .inp extension and can be created in any ASCII (text) editor.
• I’ll pick B31 2-node linear beam
Simple Input file (Model data)
*HEADING CANTILEVER BEAM ** ** This is in inches ** *NODE 1, 0. 6, 100. *NGEN, NSET=allnodes 1, 6 *ELEMENT, TYPE=B31 1, 1, 2 *ELGEN, ELSET=BEAM 1, 5 *BEAM SECTION, SECTION=RECTANGULAR, ELSET=BEAM, MATERIAL=STEEL 1., 2. *MATERIAL, NAME=STEEL *ELASTIC 30.E6, *BOUNDARY 1, ENCASTRE
Beam example
y, 2 20,000 lbs
x, 1 Steel beam, Young’s modulus 30x106 lbs/in2 Length 100 inches, width = 1 inch, height = 2 inches
Beam example
I want to know stresses and strains along the x-direction and the forces and moments in each section of the beam due to a static load.