nas113 workshop 1 - msc softwarepages.mscsoftware.com/...hole_tension_test_021312.pdf ·...

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Composites Technology Day, February 2012

Copyright 2012 MSC.Software Corporation

WORKSHOP 3

Open-Hole Tension Test Coupon

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Objectives

• Workshop Objectives

– Become familiar with the basic steps of setting up a progressive ply

failure analysis

• Software Version

– Patran 2011

– MD Nastran 2011.1

• Required File:

– tension_test_coupon.db

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Problem Description

• Determine the allowable strength of a new 15-ply composite layup

design

• The left end is fixed and a tensile load is applied to the right end.

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a

Step 1. Open an existing Patran Database

Start Patran and open a database

containing the composite test

coupon:

a. Click File Open in the Defaults

group.

b. Select

tension_test_coupon.db as

the File name.

c. Click OK.

c

b

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Plot loads and boundary conditions:

a. Click the Loads/BCs tab.

b. Set Action to Plot Markers.

c. Select Displ_fixed and click

Apply. This plots the simple

support at the left end of the

part.

d. Select Displ_pull and click

Apply. This plots the 0.2 in

enforced displacement applied

to the right end of the part.

e. Click Reset Graphics to clear

the markers.

Step 2. Review Loads and Boundary Conditions a

b

c

e

d

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Step 3. Define Ply Material Properties

Define Ply Material:

a. Click the Properties tab.

b. Click 2D in the Orthotropic

group.

c. Enter ply for Material Name.

d. Click on Input Properties….

e. Enter 17E6, 1.4E6, 0.34,

0.45E6, 0.45E6, 0.45E6 as

shown.

f. Click OK.

g. Click Apply.

h. Click on Input Properties …

again.

i. Select

Failure1(SOL400/600) /

Puck / Gradual.

j. Enter 200E3, 100E3, 15E3,

30E3, 15E3, 0.35, 0.35, 0.27,

0.27, 0.01 as shown.

k. Click OK.

l. Click Apply again.

b

c

d

e

h

f

g

i

j

k l

a

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b

c d

e

g

f

Step 4. Define Composite Layup

Define the layup:

a. Click Laminate in the Composite Group.

b. Enter laminate for Material Name.

c. Click ply under Existing Materials 15 times to make 15 plies.

d. Click on ply 1’s empty Thickness cell.

e. Enter 0.01 in the Set Thickness box and press the Enter key.

f. Click on ply 1’s empty Orientation cell.

g. Enter the following into the Input Data box: 45/-45/45/-45/90/45/-45/0/-45/45/90/-45/45/-45/45 and press the Enter key.

h. Click Apply.

h

a

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f

Step 5. Define Element Property

Define element property:

a. Click Shell in the 2D

Properties group.

b. Enter plate for Property Set

Name.

c. Select Laminate for Options.

d. Click Input Properties….

e. Click on the Mat Prop Name

icon and select laminate.

f. Click in the Material

Orientation box, then screen

select Coord 0.

g. Select Large Strain for

Nonlinear Formulation.

h. Click OK.

b

d

c

a

f

e

e

g

h

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Step 5. Define Element Property (cont.)

Define element property (cont.)

i. Click Select Application

Region…

j. Rectangular select all 6

surfaces.

k. Click Add.

l. Click OK.

m. Click Apply.

i

m

j

j

k

l

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Step 6. Set up Analysis

Set up analysis:

a. Click the Analysis tab.

b. Select Analysis Deck.

c. Enter Job Name

tensile_coupon.

d. Click on Solution Type….

e. Select Implicit Nonlinear.

f. Click on Solution

Parameters….

g. Select Shell Shear

Correction and SOL400

Run.

h. Click OK.

i. Click OK.

b

c

d

e

f

g

h

i

a

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Step 6. Set up Analysis (Cont.)

Setup Analysis:

j. Click on

Subcases….

k. Click on Default

under Available

Subcases.

l. Click on Subcase

Parameters….

m. Click on Load

Increment

Params….

n. Select Adaptive for

Increment Type.

o. Enter 0.05 for

Maximum Time

Step.

p. Click OK.

q. Click OK.

r. Click Apply.

s. Click Cancel.

t. Click Apply.

j

k

l

m

n

o

p q

r s t

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Step 7. Edit Nastran Input File

– Open the newly created input file tensile_coupon.bdf with

WordPad (or any other text editor)

– Search for MATF (Edit/Find…).

– Change the third field from 0 to 2 (for gradual selective PFA).

– Save the modified file.

2

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Step 8. Submit Job to MD Nastran

Run the analysis:

a. Double click the MD Nastran icon

on the desktop.

b. Browse and select

tensile_coupon.bdf.

c. Click Open

d. Enter scr=no as optional keywords

e. Click Run

a

b

c

d

e

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Step 8. Submit Job to MD Nastran

– Open tensile_coupon.sts file to check the job status – normal completion if job

ends with exit number 0.

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Step 9. Attach Results File

Access Results file:

a. Select MASTER/DBALL.

b. Click on Select Results

File….

c. Browse to the working

directory and select

tensile_coupon.MASTER.

d. Click OK.

e. Click Apply.

a

b

c

d

e

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Step 10. Plot Results

Display ply stresses:

a. Click the Results tab.

b. Click Fringe.

c. Select the last

increment under

Select Result Cases.

d. Select Composite

Stress, Ply Stress

under Select Fringe

Result.

e. Click Apply.

On you own, review other

layers and other

stress components.

d

b

c

a

e

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Step 10. Plot Results (cont.)

Display damage:

a. Select Total Damage for

Progressive Failure under

Select Fringe Result.

b. Click Apply.

c. Select Matrix Damage for

Progressive Failure and

click Apply.

d. Select Fiber Damage for

Progressive Failure and

click Apply.

Damage value indicates the

degree of material stiffness

degradation.

Damage = 1.0 – residual

stiffness

b

a

c

d

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Step 10. Plot Results (cont.)

Change fringe plot extrapolation

option to average:

a.Click Plot Options

b.Set Extrapolation to Average.

c.Click Apply.

a

a

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Step 11. Plot Load-Deflection Curve

e

f g

j

h

b

c

i

d

Plot load-deflection curve:

a. Click the Reset Graphics icon.

b. Click Graph.

c. Select all increments under

Select Result Cases.

d. Select Constraint Forces

Translational under Y Result.

e. Select X Component Quantity.

f. Select Result for X.

g. Click Select X Result….

h. Select Displacements,

Translational under Select X

Result.

i. Select X Component Quantity

j. Click OK.

k. Click the Target Entities icon.

l. Pick the independent node of

the RBE2 where the enforced

displacement is applied.

m. Click Apply.

k

l

m

a

l

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Step 11. Plot Load-Deflection Curve (Cont.)

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End of Workshop 3

File/Quit to exit Patran.

nas113 workshop 1 - msc softwarepages.mscsoftware.com/...hole_tension_test_021312.pdf ·...

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