Numerical Analysis and Research of Crack Tip Macro-Micro Stress Concentration for Polymer-matrix Composites

Abstract

In this study the numerical analysis and simulation of the microstress field for the polymer matrix composites are achieved by combining the finite element method with the homogenization theory at the location of the crack tip where macrostress concentration occurs. The relation of the macro-micro stress concentration is investigated, and the results obtained show that the microstress concentration coefficients are relevant to the material property of inclusion at the microstatus, but not with the inclusion volume fraction or the location at the macrostructure. The microstress field is obtained in which the material property of inclusion is changed from flexibility to rigidity and the inclusion material possesses different volume fractions. The distribution rule of concentration coefficient for the principal stress, the radial stress, the tangential stress, and the Von Mises stress is displayed along the circumferential interface of inclusion respectively.

Keywords

polymer-matrix composites homogenization method finite element analysis macro-micro stress concentration

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