混杂复合三明治结构低速冲击特性及剩余压缩强度研究

STUDY ON THE LOW⁃VELOCITY IMPACT AND RESIDUAL COMPRESSIVE STRENGTH OF HYBRID COMPOSITE SANDWICH STRUCTURES

采用实验和仿真相结合的方法,探究蜂窝夹层结构在不同冲击能和不同边界条件下的冲击特性及剩余压缩强度。用Vumat子程序建立三维渐进失效准则,通过实验验证仿真模型的有效性。结果表明,简支试样更容易发生损伤,峰值力也更低,但吸能效果略好。同时,简支试样冲击后的剩余压缩强度较低。当冲击能较低时,边界条件对剩余压缩强度有着重要影响。而在较大的冲击能下,边界条件对剩余压缩强度的影响可以忽略。

The impact characteristics and residual compressive strength of the honeycomb sandwich structure under different impact energies and different boundary conditions were studied by testing and finite element analysis.The Vumat subroutine was used to establish a three⁃dimensional progressive failure criterion.The validity of the simulation model was verified by experiments.The results show that the simply supported specimens are more prone to damage and the peak force is lower,but the energy absorption effect is slightly better.At the same time,the residual compressive strength of the simply supported sample after impact is relatively low.When the impact energy is low,the boundary conditions have an important influence on the residual compressive strength.The influence of boundary conditions on the residual compressive strength can be ignored when the impact energy is large.