Analysis 12345

1 © 2013 ANSYS, Inc. December 11, 2013 ANSYS Confidential and Proprietary Information 2013 ANSYS Advisory Council Meeting

ANSYS 15.0 Composites Technology

2 © 2013 ANSYS, Inc. December 11, 2013

ACP Training

New Features in ACP 15.0


ACP Training

Easy Submodeling for Composites

Global Results

IRFs shell

SHELL

SOLID

IRFs solid

Create solid model of critical part (C5 – E2)

and map shell results to the cut faces (D7 - E3)


ACP Training

Enhanced Interlaminar Shear Stress for Solid Composites

Consideration of solid element stacks for stress computation:

• Boundary conditions at top and bottom surface

• Continuity between elements


ACP Training

Enhanced Interlaminar Shear Stress for Solid Composites

Solid Stack 3 elements Layup Result (solid185)

ACP: Recomputed stresses


ACP Training

Support for Thermal Solid Composites in Mechanical

Thermal solid composites are now supported in models with Imported Layered Sections.

Thermal analysis now supports solid layer elements SOLID278/SOLID279


ACP Training

Temperature Dependent Material Model in ACP Post

ACP Post supports evaluation of temperature dependent strength and Failure Criteria given the following additional data:

• Temperature dependent material properties

• Computed layered element temperatures


ACP Training

1D Lookup Tables

New 1D Lookup Tables defined by

• Start Point

• Orientation

• Value / Coordinate Pairs


ACP Training

Interface Delamination

Interface delaminations can now be modeled in Mechanical

Supported techniques to define failure criteria:

• Virtual Crack Closure Technique (VCCT)

• Cohesive Zone Model (CZM)

Definition:

1. Define CZM material properties/ VCCT fracture criteria in ED

2. Create delamination interface in ACP or Mechanical

3. Configure and run crack growth analysis in Mechanical


ACP Training

Interface Delamination

ACP


ACP Training

CDM-Based Progressive Damage

• New nonlinear solution process in MAPDL to simulate the damage propagation in composites beyond first ply failure

• Damage evolution with Continuum Damage Mechanics (CDM) method

Example: progressive damage of a composite plate under stretch load

Start of damage (layer 1)

Progressed damage (layer 1)

Progressed damage (layer 3)


ACP Training

Geometry Export of Ply and Laminate Surfaces

Export ply geometries with offset and fiber alignment for further processing:

- Generate 3D shapes

- Check collision

- Production data

Color stands for the fiber angle


ACP Training

Failure Criteria Enhancments: Hoffman and LaRC 04 failure criteria

New 2D and 3D failure criteria

Quadratic failure criteria Damage mode based


ACP Training

ACP Program Improvements

• Refactored ACP Post:

• Explicit computation of results for defined geometrical scope

• Handling of plots in GUI similar to ANSYS Mechanical

• Easy transfer of composite definitions between ACP cells and between WB projects


ACP Training

Thank you for your attention


ACP Training

Composite Topics for the Future

• Shear dependent material models for woven materials

• Material degradation models (knock-down factors)

• Composite fatigue framework

• Consider stresses and spring back effects induced during manufacturing

• Specific functionality for winded and braided plies

• Mapping of composite layups to existing meshes.

• Working with effective ply boundaries

• Coincident volume fill mesh for sandwich cores and filler areas

• Separate module for composite solid meshing


ACP Training

Result

Hollow blade

Volume fill mesh operations for 'noodles' or sandwich cores

ACP Shell Layup

Layered shell with filled volume mesh

Combined ACP Solid Model with shell mesh


ACP Training

Specific functionality for winded and braided plies

• Complex laminate properties (thickness, sequence and fiber orientations) in the pole regions

• Layup in ACP is directly derived from winding simulation

Import winding data

Export shell or solid model


ACP Training

Shear Dependent Material Models for Woven Materials

• Draping simulation can compute

• Effective fiber directions

• Thickness variations

• Shear of woven materials

• Material shear significantly affects the material properties

Consider shear dependent material properties in the analysis


ACP Training

Material Degradation Models (Knock-down factors)

• Due to manufacturing process related issues the quality of composite material is not constant over a part.

• Areas of reduced quality are often known upfront or can be identified by destructive as well as non-destructive inspection methods.

• There shall be an option based on look-up tables to define degradation-values dependent on locations for certain material properties


ACP Training

Fatigue Analysis for Composites

• Prominent topics with composite structures.

• Classical models based on macroscopic material-models requires a huge amount of test-data. For general laminates this approach is not feasible

• Fatigue-models have to be able to calculate stresses and strains for fibers and matrices based on the nodal solutions for every model.

• Fatigue then can be evaluated for fiber and matrix separately for every layer within every element relaying only on a limited set of material-data for fibers and matrix.


ACP Training

Working with effective ply-boundaries

Explore concepts to handle ply boundaries independent of FE mesh discretization

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Analysis 12345

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