基于改进桥联模型的CFRP层合结构抗冲击载荷动态力学性能研究

Dynamic Mechanical Property Study of CFRP Laminate Structure Based on Modified Bridging Model Under Compressive Impact

  • 摘要: 为研究碳纤维增强树脂基复合材料(CFRP)在冲击载荷下的力学响应,本文基于桥联模型,采用含应变率效应的动态本构方程以及屈服准则,对CFRP层合板进行了优化设计和动态压缩强度分析.利用相关文献中的层合板准静态及动态试验结果,对改进的桥联模型程序进行验证,结果吻合良好.在此基础上,对比分析了几种CFRP层合板铺层设计方案,优选并制备其中一铺层的层合板,实施了中等应变率的压缩试验,前期理论计算结果与试验结果有较好一致性.本文工作可用于抗高冲击载荷CFRP层合结构的优化设计及性能预测.

     

    Abstract: To investigate mechanical response of CFRP material under shock loading, a dynamic constitutive equation and yield criterion considering strain rate effects, which are based on bridging model, were used to conduct the design optimization and analyses the dynamic compressive strength of CFRP laminates. The calculated mechanical properties of some laminates under different strain rates are first compared with the experimental results, which are obtained from relevant literatures. The results calculated by improved bridging model and theoretical model are agreed well with the test results. Then, through analyzing some structure design schemes, one structure design scheme is selected and manufactured to conduct medium strain rate compressive tests. The previous theoretical results are consistent with experimental results. This work can be used for the optimization design and predict the property of CFRP laminate structure under shock loading.

     

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