| Citation: | ZHANG Chao, LIU Jianchun, FANG Xinet al. Damage analysis in composite laminates under low velocity oblique impact[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(12): 2388-2397. doi: 10.13700/j.bh.1001-5965.2021.0154(in Chinese)
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Fiber reinforced composite laminates are sensitive to low velocity impact events, and the induced damage extensively reduces the load-bearing capacity and service life of composite structures. A continuum damage mechanics based finite element model is proposed to investigate the mechanical behavior of composite laminates under low velocity oblique impact. The Hashin criteria and a gradual degradation model are employed to predict the intra-laminar damage initiation and evolution; cohesive elements ruled by the bilinear Traction-Separation constitutive relation are applied to simulate delamination. A user material subroutine VUMAT is then developed and implemented to obtain the numerical solution based on ABAQUS/Explicit solver. The numerical results are largely consistent with the available experimental data under normal impact, thus validating the effectiveness of the proposed model. The effects of the impact angle and impact energy on the oblique impact properties of composite laminates are discussed and the damage mode and failure mechanism are analyzed in detail, providing insight into the numerical study on general oblique impact problems in composite structures.
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