低速冲击碳纤维增强铝合金层合板力学响应

Dynamic response of carbon fiber reinforced aluminum alloy laminate at low-velocity impact

基于ABAQUS/Explicit建立低速冲击碳纤维增强铝合金(CFRP/Al)层合板有限元模型。采用Johnson-Cook本构模型模拟铝合金蒙皮力学行为,使用材料子程序VUMAT定义3D Hashin准则,以此判定碳纤维增强复合材料层内失效,Cohesive单元模拟层间胶粘层分离与分层损伤。模拟结果表明,铝合金蒙皮可以有效提高碳纤维增强基复合材料抗冲击性能,并且随着蒙皮厚度增加,CFRP/Al层合板变形量、接触力峰值会有所增大,吸能量和剩余冲击能占比有所减小;随着冲击能增加,层合板变形量、吸能量、接触力峰值、剩余冲击能占比皆呈增大趋势。

The finite element model of low-velocity impact carbon fiber reinforced aluminum alloy(CFRP/Al)laminate was estublished based on ABAQUS/Explicit.The Johnson-Cook principal structure model was used to simulate the mechanical behavior of aluminum alloy skin,and the 3D Hashin criterion was defined by the material subroutine VUMAT,so as to determine the intra-ply failure of carbon fiber reinforced composites,and the Cohesive unit simulated the inter-ply adhesive layer separation and delamination damage.The simulation results show that the upper and lower surface aluminum alloy skins can effectively improve the impact resistance of carbon fiber reinforced matrix composites,and as the thickness of the skin increases,the deformation amount and the peak contact force of the CFRP/Al laminate will increase,and energy absorption and the proportion of residual impact energy will decrease.With the increase of impact energy,the deformation amount,energy absorption,contact force peak and the proportion of residual impact energy of the laminates all showed an increasing trend.