A Discrete Model for Simulation of Composites Plate Impact Including Coupled Intra- and Inter-ply Failure
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- 作者：Sebastian Jäger ; Anthony Pickett ; Peter Middendorf
- 关键词：A. Delamination ; B. Fracture ; C. Impact behaviour ; D Finite element analysis (FEM)
- 刊名：Applied Composite Materials
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：23
- 期：2
- 页码：179-195
- 全文大小：4,759 KB
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Anthony Pickett (1)
Peter Middendorf (1)
1. Institute of Aircraft Design, University Stuttgart, Stuttgart, Germany - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Characterization and Evaluation Materials
Mechanics
Polymer Sciences
Industrial Chemistry and Chemical Engineering - 出版者：Springer Netherlands
- ISSN：1573-4897
文摘
Laminated composites can undergo complex damage mechanisms when subjected to transverse impact. For unidirectional laminates it is well recognized that delamination failure usually initiates via intra-ply shear cracks that run parallel to the fibres. These cracks extend to the interface of adjacent orthogonal plies, where they are either stopped, or propagate further as inter-ply delamination cracks. These mechanisms largely determine impact energy absorption and post-delamination bending stiffness of the laminate. Important load transfer mechanisms will occur that may lead to fibre failure and ultimate rupture of the laminate. In recent years most Finite Element (FE) models to predict delamination usually stack layers of ply elements with interface elements to represent inter-ply stiffness and treat possible delamination. The approach is computationally efficient and does give some estimate of delamination zones and damaged laminate bending stiffness. However, these models do not properly account for coupled intra-ply shear failure and delamination crack growth, and therefore cannot provide accurate results on crack initiation and propagation. An alternative discrete meso-scale FE model is presented that accounts for this coupling, which is validated against common delamination tests and impact delamination from the Compression After Impact (CAI) test. Ongoing research is using damage prediction from the CAI simulation as a basis for residual strength analysis, which will be the published in future work.