It is of great practical significance to study the high velocity bird impact resistance of fiber metal honeycomb sandwich structures as they are lightweight aerospace structures.In this work,a continuum damage mechanics based nonlinear finite element model is developed to study the mechanical behavior and damage mechanics of fiber metal honeycomb sandwich structures subjected to high velocity bird impact.The smooth particle hydrodynamics(SPH)method is employed to model the hydrodynamic behavior of the bird body.The Johnson-Cook model is utilized to capture the damage response of aluminum layer.The 3D Hashin failure criteria are adopted to predict the intra-laminar damage evolution of composites considering the high strain-rate effect.Cohesive elements are incorporated to simulate the inter-laminar delamination phenomena.A user material subroutine VUMAT is coded and implemented to obtain the numerical solution based on the ABAQUS/Explicit solver.The effects of bird velocity,honeycomb height and plate thicknesses on the bird impact properties of fiber metal honeycomb sandwich structures are discussed and the damage characteristics are analyzed in detail in pre-stress conditions.This study provides a proper reference for numerical study on bird impact problems of other sandwich structures.
关键词
纤维金属板夹芯结构/鸟体冲击/损伤/分层/有限元建模
Key words
fiber metal sandwich structure/bird impact/damage/delamination/finite element modeling
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