碳纤维-玻璃纤维混杂增强环氧树脂复合材料低速冲击性能及其模拟

本文基于实验和数值模拟方法研究了碳纤维-玻璃纤维混杂增强环氧树脂复合材料低速冲击性能.采用商业有限元软件ABAQUS建立了层间/层内两类混杂复合材料低速冲击模型,采用基于应变形式的Hashin失效准则模拟面内损伤;零厚度Cohesive内聚力单元预测层间分层;编写VUMAT子程序定义渐进失效过程,并结合C扫和Micro...

Low-velocity impact behavior and numerical simulation of carbon fiber-glass fiber hybrid reinforced epoxy composites

The low velocity impact behavior of carbon fiber-glass fiber hybrid composites were investigated based on experimental and numerical simulation.Two finite element models of interlayer and intralayer hybrid composites under low velocity impact were established in ABAQUS software.The strain-based Hashin failure criteria was adopted to predict the intralaminar damage and zero thickness Cohesive elements were used to simulate the delamination.The progress damage process were carried out by user-defined subroutine VUMAT.Internal microscopic damage state and damage distribution condition were obtained by means of C-scan and Micro-CT technique.The results show that the interlayer hybrid structure composites provide better impact-resistant properties,while the I-C hybrid structure composites present the best impact behavior.The difference of impact response of hybrid structure composites is not obvious when the impact-side face is glass fiber.The impact property of CN-1 intralayer hybrid structure composites is better than that in CN-2 intralayer hybrid structure composites.The damage induced by low velocity impact includes the fiber broken near impact point,matrix damage and delamination.Hybrid structure can reduce impact damage effectively.The glass fiber layers in interlayer hybrid structure experienced severe damage and the hybrid interface have influence on the damage of intralayer laminates.The carbon fiber bundles provide protection effect on neighbor glass fiber bundle.