Discrete Impact Modeling of Interand Intra-laminar Failure in Composites

Discrete Impact Modeling of Inter- and Intra-laminar Failure in Composites Christophe Bouvet, Natthawat Hongkarnjanakul, Samuel Rivallant, and Jean-Jacques Barrau Abstract The goal of this study is to initiate a “test-calculation dialogue” on low velocity/low energy impact tests in laminated composites. The different types of impact damage developing during an impact test, i.e. matrix cracking, fiber failure, interface delamination and permanent indentation, are simulated. The bibliography shows a general lack of detailed validation of impact modeling and the originality of this work is to use refined and complementary experimental data to build and validate a numerical model. The good correlation between the model and this refined experimental database gave us relative confidence in the model, despite a few non- standard material parameters. Permanent indentation was particularly focused and studied. Then we propose an original scenario to create permanent indentation, with a debris blocking phe- nomenon in the matrix cracks, as well as the corresponding model. The fiber failure model was set up using an original formulation between the integration points of the volume element in order to dissipate a constant energy release rate per unit area. Finally the model was used to evaluate the distribution of the dissipated energy among the different damage types, and demonstrated an interesting distribution between fiber failure and delamination. 1 Introduction Composite materials have been increasingly used in airframe and space applications in recent decades because of their advantageous characteristics, such as their low specific weight, enhanced mechanical strength, and high stiffness coefficient. C. Bouvet () • N. Hongkarnjanakul • S. Rivallant • J.-J. Barrau INSA; UPS; Mines Albi; ISAE; ICA (Institut Cl´ ement Ader), Universit´ e de Toulouse, ISAE, 10, avenue Edouard Belin, 31055 Toulouse Cedex 4, France e-mail: [email protected] 1

Discrete Impact Modeling of Interand Intra-laminar Failure in Composites

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matrix cracking laminate

laminate composites

fiber failure

testcalculation dialogue

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