基于非完善界面单向纤维复合材料弹性模量预测与应力分析

ESTIMATION OF ELASTIC MODULUS AND ANALYSIS OF STRESS OF UNIDIRECTIONAL FIBER COMPOSITES BASED ON IMPERFECT INTERFACE

界面缺陷对复合材料的性能有着显著的影响,基于弹性力学以及能量原理基本理论,利用基于界面上应力连续而位移有一定突变的无厚度弹簧模型,对含界面缺陷的材料性能进行了探究。得出界面的非完善参数、纤维相体积分数对材料的纵向与横向弹性模量、泊松比以及应力的影响规律。并将计算结果与完善界面、开孔的经典结果以及实验数据进行了对比验证。计算结果表明,利用非完善界面参数预测含缺点界面的材料性能并进行应力分析比利用完善界面模型计算的结果更精确。

The interface defects have a significant effect on the properties of the materials performance. In this paper,the spring model without thickness has been considered to investigate the composite properties with imperfect interface in the elastic theory and energy principle. The relationships between the imperfect parameter,the volume fraction of fiber,and the effective properties,including the effective longitudinal and transverse elastic modulus and Poisson＇s ratio were studied. Meanwhile,the results for the imperfect interface were compared by the classical results of perfect interface and a hole at two limit cases,and the test data. The result for finite positive values of interface parameter shows that the interface parameter can be used to estimate the material properties with the interface defects.