短纤维增强复合材料纤维和界面层残余热应力分析

A short fiber reinforced composition and interface residual stress analysis

基于应力传递的剪滞理论,详细分析推导了纤维中的残余热正应力和界面层中的剪应力解析公式,并与已有的理论公式进行了比较。同时分析了纤维与基体脱粘的原因及热残余应力主要影响因素,主要包括:纤维和界面层材料的弹性模量,界面层的厚度以及纤维的长径比等。通过分析得出:纤维中的压应力和界面层中的剪应力都随着界面层的厚度及其弹性模量的增大而增大;纤维长径比的大小对纤维中的压应力和界面层中的剪应力大小及分布的影响很小。

Based on the shear lag theory, the formulations of thermal residual stress in short fiber reinforced composites and interface shear stress were derived in details . The effects of the interface properties on thermal residual stress was analyzed mainly in this paper. In order to investigate the effect of various parameters on thermal residual stress , an analytical formulation was provided .The following parameters were found to have influence upon thermal residual stress: the module E of short fiber and interface material, the thickness of interface and length-width ratio of fiber's. The numerical analysis showed that the results well agreed with the formulation presented in reference materials. It could be concluded that the stress in fiber and shear stress in interface will become greater when the thickness of interface or the module E of the interface increasing, and the fiber's aspect ratio has little influence on the stress in fiber and shear stress in interface.