| Citation: | ZHANG Chao, FANG Xin, LIU Jianchunet al. Damage prediction and failure mechanism of composite laminates under high-velocity hailstone impact[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(4): 698-707. doi: 10.13700/j.bh.1001-5965.2020.0636(in Chinese)
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Aiming at the potential risk of hailstone impact on the safety of composite structures, a continuum damage mechanics based nonlinear finite element model was developed to study the mechanical behavior of carbon fiber composite laminates under high-velocity hailstone impact. The Lagrangian method and smoothed particle hydrodynamics (SPH) method were used together to model the impact of hailstone, and the equation of state of water was introduced to describe the flow characteristics of the hailstone after breaking. A rate-dependent constitutive model of unidirectional composite, as well as 3D Hashin failure criteria and material stiffness reduction rule, was applied to predict the in-plane damage in composite layers. Interface elements governed by bilinear cohesive model were employed to simulate the inter-laminar delamination phenomena induced by impact. A user material subroutine VUMAT was coded and implemented to obtain the numerical solution based on ABAQUS/Explicit solver. The transient process of composite laminates under hailstone impact was reproduced and the damage characteristics and failure mechanism were analyzed in detail. The effects of impact velocity and impact angle of hailstone on the impact properties of composite laminates are discussed, which provides proper reference for numerical investigation of hailstone impact problems in composite structures.
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