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8/10/2019 Track 1 1530 ACP Joe Luxmoore

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© 2011 ANSYS, Inc. June 24, 20131

Analysis of composite structures with ACP

Joe Luxmoore



© 2011 ANSYS, Inc. June 24, 20132

Introduction to ANSYS Composite PrePost

Demo

Agenda



© 2011 ANSYS, Inc. June 24, 20133

Layered composites simulationrequires:

• Orthotropic material stiffness terms(E’s, G’s, nu’s)

• Lamina (ply) thickness• Fibre Orientation – draping• Understanding of stacking sequence

implications (in-plane and out-of-planecoupling, bending and twisting duringcure)

• Orthotropic strengths• Understanding of numerous potential

modes of failure and the variousfailure theories

What makes composites analysischallenging?



© 2011 ANSYS, Inc. June 24, 20134

ANSYS developstools to thoroughly

investigatecomposites designsup to advancedfailure analysis,

with unparalleledease of use.



© 2011 ANSYS, Inc. June 24, 20135

ANSYS composites technology

Solid-ShellLayered Solid

Shell

Discrete/SmearedReinforcement

• Layered shell and solid elements for more than two decades• Multi-material beams, with support for multiple layers and multiple

section integrations• Temperature dependent orthotropic material props with structural

temps at each layer• ANSYS Composite PrepPost adds ease of use and results evaluation• Integration into Workbench allows for rapid design studies• VCCT and CZM, to characterise delamination and debonding• Recent addition of progressive damage to characterise post first ply

failure



© 2011 ANSYS, Inc. June 24, 20136

Incorporating composites into a typical design workflow

Modeling Layered Composites Efficiently

Materials,Layups & Mesh B/Cs and Simulations

CompositePost-ProcessingModel/Cleanup

Design Studies


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Preprocessing with ACP



Materials



Rosettes (coordinate systems)

•

Rosettes are used to definereference directions (0 ° Fiber direction)

• The x-axis of a rosette defines the reference direction




Parallel Rosettes




Cylindrical Rosette



© 2011 ANSYS, Inc. June 24, 201312


Edge-Wise Rosette



© 2011 ANSYS, Inc. June 24, 201313

Assign rosette(s) to element sets to control fibre directions

Oriented element sets (OES)



© 2011 ANSYS, Inc. June 24, 201314

Oriented element sets (OES)



© 2011 ANSYS, Inc. June 24, 201315

Create ply groups using fabrics/stackups and OES(s)

Ply groups

Check fibre angle against referencedirection layer-by-layer



© 2011 ANSYS, Inc. June 24, 201317

Draping

Green – parallel to rosette, Blue – draped prediction

Interface to NX Fibersim



© 2011 ANSYS, Inc. June 24, 201318

Postprocessing failure criteria

Results Interrogation• Worst case failure criteria over all layersshows• Hm (1) – Hashin matrix – Layer 1• Pick element and see stress/strain and failurethrough the thickness



© 2011 ANSYS, Inc. June 24, 201319

Interlaminar normal stresses

Through-Thickness Stress Plots – Solids

Through-Thickness Stress Plots – Shells

Make Through-Thickness Stress Plots and account for Interlaminar normal stresses with shells• Below we look at the stress through the thickness in the bend• Traditional shell approaches can not account for interlaminar normal stress (shown in blue curve)• ANSYS Composite PrepPost can predict these based on the work of Roos, Kress & Ermanni• Make more accurate assessments without the need for large 3D models



© 2011 ANSYS, Inc. June 24, 201321

Composite

Composite

Metal

Solid modellingMechanical analysis of assembledmodel including contact

Assembling Multiple Inputs in Mechanical

Solid Composite Analysis inside Mechanical



© 2011 ANSYS, Inc. June 24, 201322

Modeling Layered Composites EfficientlyEven more..

• Flat pattern prediction• Right click suppress parts or plies• Map composite thickness from 3D CAD• Build complex assemblies including contact• Customize layups using scripts and tables• 2-Way FSI with composites• Progressive damage and fracture

track 1 1530 acp joe luxmoore

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