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POST PROCESSING OF STRESS RESULTS

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Workshop 4 – Introduction to MSC.Patran

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Objectives To post-process stress results from MSC/NASTRAN. To use MSC/PATRAN to create fill and fringe plots to determine if

the analyzed part will meet a customer-defined criteria or whether the part needs to be re-designed and re-analyzed.

Workshop 4 – Introduction to MSC.Patran

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Model Description In this exercise, you will examine the stress results of the clevis model

analyzed using the MSC.Marc code by rendering a variety of fringe and element fill plots.

Workshop 4 – Introduction to MSC.Patran

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Workshop 3 – Introduction to MSC.Patran

Suggested Exercise Steps1. Open up a database.

2. Analyze and attach results.

3. Read results.

4. Display range.

5. Create quick plot.

6. Create a viewport and group.

7. Create a new range.

8. Create 1st Invariant Plot with Custom Range

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Step 1. Open Up a Database

Create a new database named clevis.db.

a. File / Open… .

b. Select clevis.db for the Database List.

c. Click OK.

The viewport (PATRAN’s graphics window) will appear.

a

b

c

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Step 2. Analyze and Attach Results

The clevis model and results are imported for this exercise.

a. Analysis: Analyze / Entire Model / Full Run.

b. Click Apply.

Read in the Results to post process.

c. Read Results / Result Entities / Attach.

d. Click Select Results File… .

e. Select clevis.t16 for Selected Results File.

f. Click OK.

g. Click Apply.

b

a

d

c

g

e

f

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Step 3. Read Results

First create a fringe plot of the von Mises stress in the clevis, first with the Results form.

a. Result: Create / Quick Plot

b. Select the last result case, Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Result cases.

c. Select Stress, Global System for Select Fringe Result.

d. Select von Mises for quantity.

e. Click Apply.

e

d

c

b

a

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Step 4. Display Range

Create and assign a new numerical range to the viewport. Use the name, my_range, and the values Start=22000 and End=100 to define the new range containing 15 subrange levels.

a. Display / Ranges… .

b. Click Create.

c. Enter my_range as New Range Name.

d. Click OK.

e. Select Semi-Auto for Data Method.

f. Enter 22000 as Start

g. Enter 1000 as End.

h. Click Calculate.

i. Click Apply.

j. Click Assign target Range to Viewport.

k. Click Cancel.

c

da

e

b

i

h

g

fe

j

k

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Step 5. Create Quick Plot

Change the results label format to Integer.

a. Result: Create / Quick Plot

b. Click Fringe Attributes icon.

c. Click Label Style… .

d. Select Integer.

e. Click OK.

f. Click Apply.

e

d

c

b

a

f

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Step 6. Create Fringe

Render an element fill plot of the von Mises Stresses.

a. Results: Create / Fringe.

b. Click Select Results icon.

c. Select last result case, Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Results Cases.

d. Select Stress, Global System for Select Results Cases.

e. Select von Mises for Quantity.

f. Click Plot Options icon.

g. Select None for Domain.

h. Select Average for Extrapolation.

i. Click Apply.

i

h

g

d

c

fb

e

a

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Step 6. Create Fringe (Cont.)

Create a fringe plot of the maximum principal stress for elements 1 through 24 only.

a. Create / Fringe

b. Click Select Results icon.

c. Select last result case, Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Results Cases.

d. Select Stress, Global System for Select Results Cases.

e. Select Max Principal 2D for Quantity.

f. Click Target Entities icon.

g. Select Elements for Target Entity.

h. Copy and Paste the following Element ids, Elm 125 126 127 128 129 130 131 132 133 134 135 136 385 386 387 388 389 390 391 392 393 394 395 396

i. Click Plot Options icon.

j. Select All Entities for Domain.

k. Select Shape Fn. for Extrapolation.

l. Click Apply.

l

k

j

i

g

h

a

f

d

e

c

b

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Step 6. Create Fringe (Cont.)

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Convert the stress tensor results to the scalar , and create a fringe plot of the scalar with respect to the cylindrical coordinate system you created when building the clevis model. Plot the results on all elements.a. Select last result case,

Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Results Cases.

b. Select Stress, Global System for Select Results Cases.

c. Select X Component for Quantity.

d. Click Target Entities icon.e. Select Elements for Target

Entity.f. Select all visible elements for

Select Elements.g. Click Plot Options icon.h. Select CID for Coordinate

Transformation.i. Select Coord 1 for Select

Coordinate Frame.j. Click Apply.

Step 6. Create Fringe (Cont.)

xxg

f

e

a

d

c

b

h

i

j

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Step 6. Create Fringe (Cont.)

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Step 6. Create Fringe (Cont.)

In the default viewport, create a von Mises stress plot. Create another viewport containing only FEM and plot the 1st invariant with a customized range.

a. Click Select Results icon.

b. Select last result case, Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Results Cases.

c. Select Stress, Global System for Select Results Cases.

d. Select von Mises.

e. Click Apply.

a

b

c

e

d

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Step 7. Create Viewport and Group

Now, create a new viewport called view and create a new group call fem1, containing only FEM.

a. Viewport / Create… .

b. Enter view as New viewport Name.

c. Click Apply.

d. Click Cancel.

e. Group / Create… .

f. Enter fem1 as New Group Name.

g. Check Make Current and Unpost All Other Groups.

h. Select Add All FEM for Group Contents.

i. Click Apply.

j. Click Cancel.

b

dc

ji

h

g

f

e a

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Step 8. Create a New Range

Now, create a new range called range1, spanning from 20,000 to –20,000.

a. Display / Ranges….

b. Click Create.

c. Enter range1 as New Range Name.

d. Click OK.

e. Select Semi-Auto for Data Method.

f. Enter 20000 for Start.

g. Enter –20000 for End.

h. Click Calculate.

i. Click Apply.

j. Click Assign Target Range to Viewport.

k. Click Cancel twice.

a

d

c

k

fe

bj

i

h

g

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Step 9. Create 1st Invariant Plot with Custom Range

Finally, create a plot of the 1st invariant.

a. Click Select Results icon.

b. Select last result case, Default Stagic Step, A1:Incr=17, Time=1.00000 for Select Results Cases.

c. Select Stress, Global System for Select Results Cases.

d. Select 1st Invariant.

e. Click Apply.

f. File / Quit

e

d

c

b

a

f

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Workshop 4 – Introduction to MSC.Patran