ansys composite prep/post 12.1 modeling and · pdf file© 2009 ansys, inc. all rights...

© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

ANSYS Composite

Prep/Post 12.1

Modeling and Assessment

of Composite Structures

Pierre THIEFFRY

Lead Product Manager

ANSYS, Inc.

© 2009 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary

Summary

• Dedicated to allow for easy and efficient definition and

modification of layered-composite structures as well as their

specific post-processing

• Dedicated to provide leading-edge technology in pre- and

postprocessing of layered composite structures

• Integrates with Mechanical Simulation as well as with

Mechanical APDL

• Provides failure assessment as well as manufacturing

information such as draping and plybooks.


Terminology


Composites

• Composite materials are made of at least two distinct materials with different

material parameters for each phase

• Fiber reinforced composites (FRC) are composites where one material

component (fiber) is used as a reinforcing material for the matrix

• Composites have a wide range of usage: sports, civil engineering, automotive &

aerospace industry, shipbuilding, cables, consumer goods…


What is required to analyze

laminate composite structures?

• An accurate representation of the structure in its environment:

geometry, mesh, loads & boundary conditions

• An accurate representation of the composites : material behavior,

ply definitions, orientations of the fibers…

• A numerically accurate solver

• A wide array of tools to investigate and understand the results

and estimate the risks of failure

• Links to the manufacturing process (draping, plybooks …)

• All of this in a user-friendly environment!


The ANSYS

Composite

Prep/Post

Advantage


Accurate representation of the

geometry

• User of the ANSYS

Composite Prep/Post benefit

from all the advantages of

the ANSYS solutions:

– Direct CAD imports from all

major CAD products

– Import of standard geometry

formats (STEP, Parasolid…)

– Geometry cleaning

– Best-in class meshing

capabilities for surface and

solid models – with linear or

quadratic elements

• Meshing information as well

as loads and boundary

conditions are transferred to

ANSYS Composite PrepPost


Laminate modeling

• A hierarchical data description of materials, stackups and laminates

Base information:

Engineering data and material limits

Fabrics

Laminates

Stackups

Add thickness,

pricing and draping

information

Stack fabrics, add

pricing and draping

information

Define final

laminate

product

Stackups and laminates provides symmetry definition capabilities.


Easy-to-use yet advanced

definition of orientations

• A key element of the definition of

composite materials is the proper

orientation of the fibers

• ANSYS Composite PrepPost uses a

concept of oriented element-sets:

– user can define material application

direction and material 0° direction

– Multiple oriented element-sets can

be overlapping and differently

oriented: unique definition of

asymmetric laminate

– One or several coordinate systems

assigned to an oriented element-

set: no need for ply-subdivision

– Cartesian, cylindrical and spherical

systems are supported


Defining laminate areas

• Laminates and associated

orientations are defined on

zones (element groups)

• Zones can be applied a pre-

defined laminate

• Additional Laminates can be

constructed by progressive

stacking on zones

• Support for layer drop-off

• Easy generation of solid model

based on shell model (suitable

for thick laminate analysis)


Visualization of stacking sequences

• Stacking

sequences and

composite

thicknesses

can be

displayed on

arbitrary

sections or on

the entire

model


Computing the model’s solution

• The ANSYS Composite Prep/Post uses the ANSYS

Mechanical solutions to compute the base solution of

the model.

• All advantages of our core solutions are therefore

available:

– Support of the latest element generation: linear and

quadratic shells, linear and quadratic solids

– Layered element formulation

– Isotropic, orthotropic and anisotropic material models

– Fast and accurate solver

– Multiple time steps support


General post-processing

• Arbitrarily configurable envelope contour

failure plots

• Overlay Text-plots for easy identification of

the relevant failure-modes

• Generate superposition load cases based

on initial load cases


Failure Analysis

• ANSYS Composite PrepPost provides a unique

set of failure criteria to analyze the product:

– From simple criteria (max stress) to state-of-

the art analysis (Puck, Hashin, Cuntze)

– Interlaminar shear, normal stresses for shells

– Through thickness failure for shells

– Combination of failure criteria provides failure

envelope

– 3D implementation of main criteria (Tsai-Hill,

Hashin, Puck etc.)

– Ability to create user-defined criteria

• Results can be displayed as:

– Most critical failure criteria

– Critical layer

– Reserve, inversed reserve factors and safety

margin (based on stress limits)

– Standard results (stresses….) per layer


Draping and flat-wrap

• ANSYS Composite PrepPost

provides draping functionality to

analyze for drapability as well as

for calculation of the fiber-angle

correction

• Further ANSYS Composite

PrepPost can also provide the

flat-wrap of plies with their

distortion

• Flatwrap boundaries export to

STEP or IGES format

Flat-wrap

Draping

Correction of the element orientation after draping


Plybook generation

• A set of plies or

all plies are

selected for ply-

book

generation.


Additional capabilities

• Python scripting capabilities provide full

automation for the setup of the composite

models.

• ANSYS Composite PrepPost can update the

model definition upon design changes

without the need to redefine the entire model

through a simple update of the input mesh.


Summary


Summary

• Dedicated to allow for easy and efficient definition and

modification of layered-composite structures as well as their

specific post-processing

• Dedicated to provide leading-edge technology in pre- and

postprocessing of layered composite structures

• Integrates with Mechanical Simulation as well as with

Mechanical APDL

• Provides failure assessment as well as manufacturing

information such as draping and plybooks.

ansys composite prep/post 12.1 modeling and · pdf file© 2009 ansys, inc. all rights...

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