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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
3 © 2013 ANSYS, Inc. December 11, 2013
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)
4 © 2013 ANSYS, Inc. December 11, 2013
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
5 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
Enhanced Interlaminar Shear Stress for Solid Composites
Solid Stack 3 elements Layup Result (solid185)
ACP: Recomputed stresses
6 © 2013 ANSYS, Inc. December 11, 2013
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
7 © 2013 ANSYS, Inc. December 11, 2013
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
8 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
1D Lookup Tables
New 1D Lookup Tables defined by
• Start Point
• Orientation
• Value / Coordinate Pairs
9 © 2013 ANSYS, Inc. December 11, 2013
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
10 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
Interface Delamination
ACP
11 © 2013 ANSYS, Inc. December 11, 2013
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)
12 © 2013 ANSYS, Inc. December 11, 2013
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
13 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
Failure Criteria Enhancments: Hoffman and LaRC 04 failure criteria
New 2D and 3D failure criteria
Quadratic failure criteria Damage mode based
14 © 2013 ANSYS, Inc. December 11, 2013
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
15 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
Thank you for your attention
16 © 2013 ANSYS, Inc. December 11, 2013
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
17 © 2013 ANSYS, Inc. December 11, 2013
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
18 © 2013 ANSYS, Inc. December 11, 2013
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
19 © 2013 ANSYS, Inc. December 11, 2013
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
20 © 2013 ANSYS, Inc. December 11, 2013
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
21 © 2013 ANSYS, Inc. December 11, 2013
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.
22 © 2013 ANSYS, Inc. December 11, 2013
ACP Training
Working with effective ply-boundaries
Explore concepts to handle ply boundaries independent of FE mesh discretization