| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Development and Implementation of an Elasto-plastic, Failure and Fracture Model for Composite Materials |
| Author(s) |
Khizar Rouf, John Montesano, Mike Worswick |
| On-Site Speaker (Planned) |
Khizar Rouf |
| Abstract Scope |
FRP composites are increasingly being considered for load-bearing applications in the automotives due to their high specific mechanical properties and energy absorption. Successful integration of FRPs necessitates material models capable of accurately simulating the full-scale structural response. Most existing material models in widely-used finite element analysis software treat FRPs as linear elastic materials before failure and ignore strain rate effects. However, there is substantial experimental evidence that indicates that the stress-strain response of FRPs is nonlinear and strain rate dependent. This research focuses to develop, implement, and validate an invariant-based deformation and failure model, suitable for the shell elements, that considers the nonlinearity, pressure dependency, and strain rate-dependency and failure initiation of FRPs. The constitutive equations for modelling the elastic-inelastic response and failure initiation of FRPs are established by following the mathematical framework of the invariant formulation [1]. A user defined material model is developed in FORTRAN, based on the numerical solution of the constitutive equations, and implemented in the commercial finite element software LS-DYNA. Single element tests were performed for verification and validation of the material model. The model was found to capture the elastic response, inelastic response, strain rate-dependency and failure initiation with good accuracy. The model was also validated for a laminate and off-axis laminae. A good agreement was observed for the single element validation tests. The model is under further development for incorporating damage and performing validation at the component level.
Reference
[1] J. Boehler, Applications of Tensor Functions in Solid Mechanics., Vienna: Springer, 1987. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |