Patran实例教程

Step 3. Create elements of the hole shell (Cont.)
a. b. c. d. e. elements: create/mesh /surface Elem shape : Quad Mesher :Paver Topology : Quad 4 Surface list :enter surface5(or you can select surface 5) apply
Step 2. Create Geometry of the hole shell (Cont.)
a. Geometry: Create /curve / point b. Option 2 point c. The starting point list enter [0 2.5 0] d. The ending point list enter[10 2.5 0] e.Apply
Step 3. Create elements of the hole shell
a. b. c. d.
elements: create/mesh seed/uniform Length :enter 0.5 And select the whole drawing apply
Step 3. Create elements of the hole shell (Cont.)
a
Step 2. Create Geometry of the hole shell (Cont.)
a. Geometry: Create /curve /2DArcAngles b. Radius Enter 2.5 start angle :enter 0 c. end angle :enter 90 d. The center point list : enter [10 0 0] e. apply
Step 2. Create Geometry of the hole shell (Cont.)
a. b. c. d.
Geometry: edit/surface/break Suቤተ መጻሕፍቲ ባይዱface list :surface 1 Curve list: curve 5 apply
Step 2. Create Geometry of the hole shell (Cont.)
a. b. c. d. e.
f.
elements: create/mesh /surface Elem shape : Quad Mesher : IsoMesh Topology : Quad 4 Surface list :ebter surface4(or you can select surface 4) apply
a. b. c. d.
Geometry: edit/surface/break Surface list :surface 3 Curve list: curve6 apply
Step 2. Create Geometry of the hole shell (Cont.)
a. b. c. d.
Geometry: delete/any First just select curve and select the whole drawing Next select surface Select the surface you want to delete (surface 2)
Step 2. Create Geometry of the hole shell (Cont.)
a. Geometry: create /curve/2DArcAngles b. Radius Enter 1.2 start angle :enter -10 c. end angle :enter 210 d. The center point list : enter [10 0 0] e. apply
The shell with a hole
Workshop Objectives Model a shell with a hole, using solid elements, subjected to a concentrate force. The solid elements will undergo bending. MD Patran and MD Nastran will be used to create or analyze the linear static model. Problem Description Display the component of stress in the axial direction (direction along the length of the plate structure) and the deformed shape of the plate model. the material :E=210000 106 pa and v=0.3 The force :1 N Software Version MD Patran R2 MD Nastran R2
b.
c.
Step 3. Create elements of the hole shell (Cont.)
a. b. elements: sweep/element /extrude Element id list :just selest the whole drawing Node id list: just select the whole drawing too Extrude distance :enter 1 The others Keep default value apply
d
e
f
b
c
g
Key Concepts and Steps: Database: create a new database with Analysis Code = MD Nastran and Analysis Type = Structural Geometry: create a geometric surface to represent the plate Elements: mesh the surface with plate elements Loads/BCs: constrain one end of the shell model, and apply the constant tip load to the other end of the plate model. Materials: specify an isotropic material Properties: create a 3D shell/plate property Analysis: Solution Type = Nastran Linear Static, Solution Sequence = 101, Method = Full Run Analysis: access analysis results by attaching the XDB file to database Results: plot X-component of stress and displacement results
Step 2. Create Geometry of the hole shell (Cont.)
a. b. c. d.
Geometry: create /curve/point starting point list : enter [7 3 0] Ending point list : enter [7 -1 0] apply
Step 1. Create a Database
a
• Create a database named • Hole shell.db and specify the • model preferences: a. File / New b. Enter Hole shell as the file name. c. Click OK. d. Choose Default Tolerance. e. Select MD Nastran as the Analysis Code. f. Select Structural as the Analysis Type. g. Click OK.
a
b
c
d e
Step 2. Create Geometry of the hole shell (Cont.)
a. Geometry: Create /curve / point b. Option 2 point c. The starting point list enter [0 0 0] d. The ending point list enter[0 2.5 0] e.Apply
c.
Step 3. Create elements of the hole shell (Cont.)
a. b. c. d. e. Elements :transform/element/ mirror Define mirror plane normal : Coord 0.2 Element list : elm 1: 342(you can select the whole drawing) Apply The others Keep the default value
f.
Step 3. Create elements of the hole shell (Cont.)
a. elements: equivalence/All/tolerance cube Nodes to be exclude:just select the junction of the surface 2 and 3 apply
(Cont)
c.
d. e. f.
Step 3. Create elements of the hole shell (Cont.)
a. b. Elements :delete/mesh/ surface Surface list : surface 4 5(or you can select the whole drawing ) apply
b c
d e
Step 2. Create Geometry of the hole shell (Cont.)
e a. b. Geometry: Create /surface /curve Starting curve list: enter curve2(or you can click the curve 2 ,it can position automatically) Ending curve list: enter curve 4(or u can click the curve 4 ,it can position automatically) Apply Click on the button
c.
d. e.
b c d
Step 2. Create Geometry of the hole shell (Cont.)
a. Geometry: create /curve/2DArcAngles b. Radius Enter 1.2 start angle :enter -10 c. end angle :enter 210 d. The center point list : enter [10 0 0] e. apply
Step 2. Create Geometry of the hole shell
a. Geometry: Create /curve / point b. Option 2 point c. The starting point list enter [0 0 0] d. The ending point list enter[12.5 0 0] e.Apply