NAS101 W1.pdf

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Workshop 1-2NAS101 Workshops

Copyright 2001 MSC.Software Corporation

Pin Joint Truss Subjected to Point Loads (cont.)

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Pin Joint Truss Subjected to Point Loads (cont.)

Figure 1-1

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Problem Description:

a.Connected by pin joints

b.Simply supported at left end, roller at right endc.Treat it as two dimensional structure

d.Wood material

A = 5.25 in2

E = 1.76E6 psi

= .3 tension allowable =1900 psi

compression allowable = 1900 psi

e.Apply point loads at gr id points 2,4, and 6 as shown in Figure

1-1

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Suggested Exercise Steps:

1. Create a finite element model of the truss

members. Create a finite element mesh. (GRID and

CROD)

2. Define material properties. (MAT1)

3. Define element properties and apply them to the

model. (PROD)

4. Apply loads and boundary conditions to the model.

5. Submit the model to MSC.Nastran for analysis.

6. Post-Process results using MSC.Patran.

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Create all the nodes for this model

a. Create / Node / Edit.

b. Input [0 0 0] for this first node

c. ClickApply.

Step 1. Finite Element: Create /Node /Edit

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STEP 1A: Repeat previous steps to create all the following nodes:

NODE Location:[ ]

2 144,72,0

3 192,0, 0

4 288, 144, 0

5 384, 0, 0

6 432, 72 ,0

7 576, 0, 0

S O

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STEP 1B: Turn On the label on the screen

Show Label

St 2 ( t) Fi it El t C t /El t /Edit

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a. Create element edit

b. Change the shape to Bar

c. Click inside the Node 1 box

and place your cursor on the

screen and Select node 1 and

node 2 to create the first

element

Step 2 (cont). Finite Element: Create /Element /Edit

STEP 2A Add d l t f l t 2 t 4

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STEP 2A: Add more rod elements: from element 2 to 4

STEP 2B Add d l t f l t 5 t 8

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STEP 2B: Add more rod elements: from element 5 to 8

STEP 2C Add d l t f l t 9 t 11

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STEP 2C: Add more rod elements: from element 9 to 11

St 3 M t i l C t /I t i / M l I t

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Step 3. Material: Create /Isotropic/ Manual Input

Create the material aluminum.a. Create / Isotropic / Manual

Input.

b. Type in mat for the Material

Name.

c. Click on the Input Properties

button to bring up the Input

Option window.

d. Enter 1.76E6 for the ElasticModulus and 0.3 for Poisson

Ratio.

e. Click OK to return to the main

material menu.

f. ClickApply.

d

c

Step 3A Material: Create /Isotropic/ Manual Input/Failure

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Step 3A. Material: Create /Isotropic/ Manual Input/Failure

Create the failure limit.a. Click on the Input Input

Properties again

b. Click on the Constitutive

Model changed to Failure

button to bring up the Input

Option window.

c. Enter 1900 for the Tension

Stress limitd. Enter 1900 for the compression

stress limit

e. Click OK to return to the main

material menu.

f. ClickApply.

Step 4 Element Properties: Create /1D/ Rod

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Step 4. Element Properties: Create /1D/ Rod

Create the element properties.a. Create / 1D / Rod.

b. Enter rod as the Property Set

Name.

c. Click on the Input Properties

button.

d. Click on the mat in the

Material field on the bottom

section of the Input Propertieswindow.

e. Enter 5.25 as the cross

sectional area.

f. Click OK.

g. Select element 1:11 for the

Application Region.(pick the

1D element icon)

h. ClickAdd.i. ClickApply.

Step 5 Loads/BCs: Create/ Displacement/Nodal

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Step 5. Loads/BCs: Create/ Displacement/Nodal

Create the boundary conditionfor the model.

a. Create / Displacement /

Nodal.

b. Enter clamp as the New

Set Name.

c. Click on the Input Data.

d. Enter for the

Translation field.e. Click OK.

f. Click on Select

Appl ication Region .

g. Select FEM as the

geometry filter..

h. Select Node 1 for the

Application Region.

i. ClickAdd.j. Click OK.

k. ClickApply.

Step 5A Loads/BCs: Create/ Displacement/Nodal

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Step 5A. Loads/BCs: Create/ Displacement/Nodal



Nodal.

b. Enter dof456 as the New

Set Name.


d. Enter for the

Rotations field.e. Click OK.

f. Click on Select



geometry filter..

h. Select Node 1:7 (all the

nodes) for the Application

Region.i. ClickAdd.

j. Click OK.

k. ClickApply.

Step 5B Loads/BCs: Create/ Displacement/Nodal

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Step 5B. Loads/BCs: Create/ Displacement/Nodal



Nodal.

b. Enter rightside as the

New Set Name.


d. Enter < ,0 , 0> for the

Translation field.e. Click OK.

f. Click on Select



geometry filter..

h. Select Node 7 for the

Application Region.

i. ClickAdd.j. Click OK.

k. ClickApply.

Step 5C (cont ) Loads/BCs: Create Boundary Conditions

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Step 5C.(cont.) Loads/BCs: Create Boundary Conditions

After you have completed

previous steps,then you see the

constraints on the model as

shown below:

Step 6 Loads/BCs: Create/Force /Nodal

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Step 6. Loads/BCs: Create/Force /Nodal

Apply distributed load to the model.a. Create / Force / Nodal

b. Enter horizontal as the New

Set Name.

c. Click on the Input Data

button.

d. Enter in the

Force field.

e. Click OK.f. Click on Select Application

Region button.


Geometry Filter.

h. Select Node 2,4,6 for the

Application Region.

i. ClickAdd, and OK.

j. ClickApply.

Step 6A Loads/BCs: Create/Force /Nodal

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Step 6A. Loads/BCs: Create/Force /Nodal

Apply distributed load to the model.a. Create / Force / Nodal

b. Enter vertical as the New

Set Name.

c. Click on the Input Data

button.

d. Enter in the

Force field.

e. Click OK.f. Click on Select Application

Region button.


Geometry Filter.

h. Select Node 2,4,6 for the

Application Region.

i. ClickAdd, and OK.

j. ClickApply.

Step 6(cont ) Loads/BCs: Create Distributed Load

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Step 6(cont.) Loads/BCs: Create Distributed Load

You can see the combine

load value of 1985 on the

screen. This load is equal

to p= (1500**2+1300*2)

Step 7 Analysis: Analyze/ Entire Model/Full Run

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Step 7. Analysis: Analyze/ Entire Model/Full Run

Submit the model for analysis.a. Analyze / Entire Model / Full

Run.

b. Click on the Solution Type.

c. Select LINEAR STATIC as the

Solution Type.

d. Click OK.

e. ClickApply.

Step 8 Analysis: Attach XDB/ Result Entities/ Local

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Step 8. Analysis: Attach XDB/ Result Entities/ Local

Attach the XDB result file.a. Attach XDB / Result Entities /

Local.

b. Click on Select Result File.

c. Select the file called w1.xdb

d. Click OK.

e. ClickApply.

Step 8 (cont ) Results: Create/Quick Plot

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Step 8 (cont.) Results: Create/Quick Plot

Create a Quick Plot of the results.a. Create / Quick Plot.

b. Select SC1 result case.

c. Select Displacement,

Translational for the

Deformation Result.

d. ClickApply.

Note: Maximum

Deformation is 5.13E-1.

These information appear

at the lower right hand

corner of the plot.

NAS101 W1.pdf

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