不同孔隙率CFRP层合板静态力学性能研究

为了研究孔隙率对织物碳纤维/环氧树脂复合材料层合板静态力学性能的影响规律,分别测量了孔隙率为0.33%至1.50%的CFRP层合板的弯曲强度和层间剪切强度,并进行有限元模拟.在适用于复合材料单向板的改进Hashin失效准则基础上,建立了适用于织物纤维增强复合材料静态力学强度的失效准则.通过引入复合材料基本强度参数预测不同孔隙率CFRP层合板的力学性能,结合刚度突然退化模型,采用ABAQUS软件建立了有限元模型.试验结果表明,随着孔隙率的增加,复合材料层合板的弯曲强度和层间剪切强度均呈下降趋势.有限元模型较为准确地预测了不同孔隙率织物碳纤维/环氧树脂复合材料层合板的弯曲强度和层间剪切强度.

Research on the static mechanical properties of CFRP laminates with different void contents

The influence of porosity on the static mechanical strength of carbon fiber fabric reinforced epoxy composites laminates was investigated.The bending strength and ILSS test on the CFRP laminates with porosity levels from 0.33% to 1.50% were conducted and simulated by a finite element analysis model.The paper proposes a failure criterion of the static mechanical strength of the fabric fiber reinforced composites based on the improved Hashin failure criterion that is suitable for the undirectional composite laminates.The basic composite strength parameters are used to evaluate the mechanical properties of CFRP laminates with different porosities.A finite element analysis model is established by using ABAQUS software combined with the sudden stiffness degradation model.The experiment results show that the bending strength and ILSS decrease with the increasing of porosities.The bending strength and ILSS of the fabric carbon fiber reinforced epoxy composites laminates are simulated accurately by the finite element model.