6. Solution and Post-Processing - oss.jishulink.comoss.jishulink.com/upload/201605/1462979588811_Lesson_6_Solution... · 6. Solution and Post-Processing 7. Laminate Theory 8. Laminate

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© 2013. Siemens Product Lifecycle Management Software Inc. All rights reserved

Siemens PLM Software

1. Introduction to Laminate Composite Simulation

2. Zone-Based Process

3. Ply-Based Process

4. Modeling 3D Laminates

5. Materials and Micromechanics

6. Solution and Post-Processing

7. Laminate Theory

8. Laminate Failure Analysis

9. Laminate Dynamic Simulation

10. Laminate Optimization

Activities:

• Structural Analysis of Thick

Laminated Support

• Post reporting using mudguard

solution

Lesson 6

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Nastran solver properties- Laminate

You can export the 2D laminate as a PCOMP, PCOMPG, or PSHELL card.

Exported as NSM on the PCOMP, PCOMPG, or PSHELL cards.

If selected, SOUT is exported as YES on the PCOMP or PCOMPG card

Exported as GE on the PCOMP or PCOMPG cards.

Provide special purpose stiffness calculation for PCOMP and PCOMPG cards.

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Nastran solver properties -Laminate

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Nastran solver properties - Laminate

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What’s the Difference between PCOMP and PCOMPG?

Ply 100

Ply 103

Ply 101

4 ply global layup

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Ply Stresses - PCOMPG

Ply 100

Ply 103

Ply 101

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Ply Stresses - PCOMP

Ply 1

Ply 4

Ply 2

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Nastran solver properties - Laminate

Nastran internally converts the PCOMP and PCOMPG cards, along with the

associated material cards, to an equivalent PSHELL card with up to 4 anisotropic

MAT2 material cards.

Each MAT2 card represents a different behavior, depending on the PSHELL MID

that references it:

• MID1: Membrane

• MID2: Bending

• MID3: Transverse Shear

• MID4: Membrane-bending Coupling

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Nastran laminate export options for PCOMP , PCOMPG and PSHELL cards

Laminate Option NASTRAN Definition

None with Symmetric

stacking recipe

Only plies on one side of the mid plane are specified on the PCOMP card.

Does not apply for the PCOMPG card.

None with other

stacking recipes

All the plies are specified on the PCOMP or PCOMPG cards.

MEM Only membrane terms are retained. Intended for SOL 200.

BEND Only bending terms are retained. Intended for SOL 200.

SMEAR Stacking sequence is ignored, shear and bending-membrane coupling terms

are set to 0. Intended for SOL 200.

SMCORE with

Symmetric with Core

Stacking sequence is ignored, shear and bending-membrane coupling terms

are set to 0. Intended for SOL 200.

SMCORE + transverse

shear with Symmetric

with Core

For a sandwich, provides a PSHELL equivalent that includes membrane,

bending and transverse shear stiffness for which the extreme fiber stresses

(top of top ply and bottom of bottom ply) will be accurate. For all solutions.

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SMCORE + Transverse Shear

PSHELL representation of symmetric sandwich that allows for accurate recovery

of maximum and minimum isotropic facesheet stresses

Includes the following stiffness components:

• Membrane

• Bending (smeared facesheet representation)

• Transverse Shear

The simple PSHELL representation will not provide accurate stresses

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SMCORE + Transverse Shear - Max Stresses at –Z0 (Bottom of Ply 1)

PCOMP PSHELL

SMCORE+Tranverse Shear

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Nastran solver properties - Laminate Output Request SOUT • For the 2D laminate property, SOUT specifies whether or not the results are

written as text to the .f06 file.

• The results are always written to the .op2 file.

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Nastran solver properties- Solid Laminate

You can export the 3D laminate as a PCOMPS or a homogeneous PSOLID card.

If selected, SOUT is exported as YES on the PCOMPS card

Exported as GE on the PCOMPS card.

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Nastran solver properties – Solid Laminate Output Request SOUT • For the 3D solid laminate property, SOUT specifies whether or not the results

are written to the op2 file.

• Different behavior than for 2D laminates

• If you want results in NX Post, you must check this option.

• It is checked by default in the solid laminate modeler dialog.

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NX Nastran solver properties – Solid Laminate

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NX Nastran solver properties -– Solid Laminate

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Homogeneous Properties for 3D Laminates

Selectively replace PCOMPS by PSOLID

At the laminate/layup level

At the individual ply level

Benefit: faster solution time, fewer results

Equivalent 3D orthotropic material properties

are computed on-the-fly

Valid for symmetric and balanced layups

The further away the layup is from this

condition, the poorer the homogeneous

representation will be.

Works for NX Nastran, ANSYS and ABAQUS

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Nastran laminate results

Output Request

Force

Stress/Strain

Output Format PCOMP / PCOMPG/ PSHELL PSOLID/PCOMPS (NX) PCOMP / PCOMPG

PCOMP / PCOMPG/

PSHELL/PSOLID

PCOMPS (NX only)

Output Result Shell stress resultants Solid element forces Ply stresses and strains Ply and bond failure indices Ply and bond strength ratios Element stresses Element strains Ply stresses and strains Failure indices Strength ratios

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Nastran solutions that support ply results

• Linear statics 101

• Normal modes 103

• Buckling 105

• Nonlinear 1061

• Direct transient response 109

• Modal transient response 112

• Cyclic statics 114

• Nonlinear transient response 1291

• Design optimization 200

• Advanced nonlinear 601

Note

1. Not available for large displacement analysis

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NX Post – Native coordinate system

Native Coordinate System • Native means that the result in the op2, rst, fil or odb file is presented by

NX Post without transformation of the solver result.

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Results Coordinate Systems in NX Post

• By default, shell stress resultants are displayed in the native (element)

coordinate system.

• DMAP can be used to force storage in the material system

• Ply stress and ply strain results are displayed in the native (ply)

coordinate system.

• Interlaminar ply stress and strain results are displayed in the:

• Native (material) coordinate system for 2D elements.

• Hence the core ribbon direction should be the material direction!

• Native (ply) coordinate system for 3D elements.

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Results Locations in NX Post

• Ply results are at:

• The middle of the ply for 2D elements

• Where selected, for 3D elements

• Interlaminar results are at:

• The top of the ply for 2D elements

• The top and bottom of the ply (as requested) for 3D elements

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Elemental/Nodal Output in NX Post

• 2D element ply results are at the element centroid only.

• Elemental in NX Post

• 3D element results are as selected

• Elemental in NX Post

• Element-Nodal in NX Post

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Strength Ratios • To turn on the computation of Nastran strength ratios, you must edit

your solution and add the following PARAM:

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Shell stress resultant notations

NX Laminate Composites

Nx

Ny

Nxy

Mx (-Mx wrt Nastran)

My (-My wrt Nastran)

Mxy (-Mxy wrt Nastran)

Qx

Qy

Nastran

Fx

Fy

Fxy Mx My Mxy Vx

Vy

ABAQUS SF1 SF2 SF3 SM1 SM2 SM3 SF5 SF4

ANSYS

N11

N22

N12 M11 M22 M12 Q13

Q23

NX Post Processing

Nxx

Nyy

Nxy Mxx Myy Mxy Qxz

Qyz

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Nastran shell stress resultant convention The Nastran convention, shown in the following graphics, differs from the convention used by NX Laminate Composites in that the signs of the moments per

unit length Mx, My, and Mxy are reversed.

Nastran force convention Nastran moment convention

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Activity: Structural analysis of a thick laminated support

In this activity, you will:

•

• •

Create a laminate physical property.

Use the Extrude Laminate

command to inflate a 2D mesh with a laminate physical property definition.

Solve and display results in the post-

processing navigator

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View Laminate – Post Processing

A sketch of the laminate with the number of plies and total thickness.

Ply layup information that

includes the global ply ID, the

material composition,

thickness, and angle of the

ply .

The minimum and

maximum values of the

selected results and the ply

ID where the extrema occur

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NXLC Advanced post reporting of laminate results Use the Advanced Post Report command to quickly identify critical element and ply data over many solutions. The enveloping, filtering, and sorting tools help you to find the critical element and ply data that you want without reviewing all the solver ply data. The command reads results from Nastran, ANSYS, or Abaqus, and computes: • Ply stresses and strains (2D)

• Ply and bond failure indices

• Ply and bond margins of safety

• Ply and bond strength ratios

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Laminate post reporting reads the shell stress resultants from the structural Solver, calculates ply stresses and strains and failure indices, strength ratios and margins of safety Laminate post reporting reads ply stresses and strains from the structural

2D results from solvers and laminate post reporting

solver and calculates failure indices, strength ratios and margins of safety

Solution

Shell Stress Resultants

Ply Stresses

Ply Strains

Ply failure indices &

strength ratios

So

lver

Ply Stresses

Ply Strains

Ply failure indices,

strength ratios &

margins of safety

NX

LC

Post R

epo

rting

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3D results from solvers and laminate post reporting

Laminate post reporting reads ply stresses and strains from the structural solver and calculates failure indices, strength ratios and margins of safety

Solution

Ply Stresses

Ply Strains

Ply failure indices &

strength ratios

So

lver

Ply failure indices,

strength ratios &

margins of safety

NX

LC

Po

st

Rep

ortin

g

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Advanced post processing of laminate results

Spreadsheet and graphical post reports use the laminate properties in your active FEM. • This allows you to switch failure theories or even modify your laminates after the solution was solved to perform what-if analyses without re-solving.

• It also allows you to validate your laminates using failure theories that are not

supported by the solver, including user-defined failure theories

• Post report currently computes elemental results only. NX automatically updates draping and zones if required, prior to accessing results. The quick post report queries the results without accessing the FEM.

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Laminate spreadsheet report The laminate spreadsheet report contains reports on the following laminate results: •

•

•

The shell stress resultants.

The specific components of ply stress and strain results.

The failure indices, strength ratios, and margins of safety.

You can output filtered and sorted ply results in laminate spreadsheet reports.

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Laminate spreadsheet summary tables The spreadsheet that is generated by the spreadsheet report or the quick report contains:

•

•

A top summary table that lists the worst ply values for all the result sets and structural data input selection.

A summary table for each result set and for each structural data input selection.

For each of the requested results, the summary tables display:

•

•

•

The location where the critical value occurs.

The critical value in blue.

The value of the other quantities at the same location.

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Laminate spreadsheet summary tables

Element

Layer/Ply

Location

Name of

laminate ppt

Failure

theory -

ply

Failure

theory - bond

Selected results &

components

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Laminate graphical report The laminate graphical report generates laminate results contours that you can display from the Post Processing Navigator. These results are stored in a binary file in the current directory. The laminate graphical report outputs the following laminate results:

• Ply stress and strain.

• Ply failure indices, strength ratios, and margins of safety.

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Laminate graphical report

Results are first enveloped over solutions, and then over all selected plies

Ply results

enveloped over all

solutions

Elemental results

enveloped over all

solutions and

over all plies

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Use the Show Critical Ply ID option of Post View to display the ID of the critical ply for the elemental, ply-enveloped results.


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Use the Show Critical Load Case option of Post View to display the ID of the critical load case for the elemental, ply-enveloped results.


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Results Source

• You can set the solver shell stress resultants or the solver ply stresses and

strains as the input to the laminate solver.

Results Location

• When using the shell stress resultants as the input, you can select any

combination of bottom, middle, and top locations for the ply stress/strain

calculation.

Results Coordinate System

• Results can be computed in the ply or the laminate coordinate systems.

• The laminate coordinate system option can only be used when the results source

is shell stress resultants.

Laminate graphical /spreadsheet reports

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Laminate graphical /spreadsheet reports

Computation Domain • You can also request the data on selected elements

and plies.

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Laminate quick report The laminate quick report exports the results summaries to an Excel spreadsheet or a CSV file without querying the active FEM. The quick report contains:

• •

A top summary table that lists the worst ply values for all the result sets. A summary table for each result set.

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NX Post Results Manipulation The NX Post results manipulation tools are capable of processing ply results

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Activity: Structural analysis of a satellite antenna

In this activity, you will:

• Create a simulation file with a Nastran or ANSYS solution.

• Use the View Laminate command

• Export ply results to a spreadsheet and a quick report.

• Create a graphical post report and identify the critical plies

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Review questions

1.

2.

3.

True/False. NX Laminate Composites can post process the results from Nastran, Abaqus, ANSYS, and LS-DYNA.

True/False. Spreadsheet and graphical post reports query the active FEM.

True/False. Spreadsheet and graphical post reports can filter and sort results.

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Answers to review questions

1. True/False. NX Laminate Composites can post process the results from Nastran, Abaqus, ANSYS, and LS-DYNA.

• False. You can only write out the LS-DYNA solver input file. NX does not support LS-DYNA solver and cannot post process LS-DYNA results.

2. True/False. Spreadsheet and graphical post reports query the active FEM.

• True. Spreadsheet and graphical post reports use the laminate properties in your active FEM, so that you can switch failure theories and even modify your laminates after the solution was solved to perform what-if analyses. The laminate quick report exports the results summaries to an Excel spreadsheet or a CSV file without querying the active FEM.

3. True/False. Spreadsheet and graphical post reports can filter and sort results.

• False. You can sort and filter the laminate results only with the spreadsheet report.

Documents

6. Solution and Post-Processing - oss.jishulink.comoss.jishulink.com/upload/201605/1462979588811_Lesson_6_Solution... · 6. Solution and Post-Processing 7. Laminate Theory 8. Laminate