Abstract
This article presents a numerical technique for computing the biaxial yield surface of polymer-matrix composites with a given microstructure. Generalized Method of Cells in combination with an Improved Bodner-Partom Viscoplastic model is used to compute the inelastic deformation. The validation of presented model is proved by a fiber Bragg gratings (FBGs) strain test system through uniaxial testing under two different strain rate conditions. On this basis, the manufacturing process thermal residual stress and strain rate effect on the biaxial yield surface of composites are considered. The results show that the effect of thermal residual stress on the biaxial yield response is closely dependent on loading conditions. Moreover, biaxial yield strength tends to increase with the increasing strain rate.
Highlights
Due to their remarkable mechanical characteristics and wide range of potential applications, composites have attracted extensive attention of researchers
Initial and subsequent yield surfaces of highly anisotropic materials were studied by experimental methods
For fiber-reinforced composites, the representative volume elementorced (RVE) is extracted from the cross comp section which is perpendicular to the fiber direction
Summary
Due to their remarkable mechanical characteristics and wide range of potential applications, composites have attracted extensive attention of researchers. Namely the analytical micromechanical method and the finite element method, have been used to study yield the behaviors of composites under complex stress conditions. Initial and subsequent yield surfaces of highly anisotropic materials were studied by experimental methods. Few studies concerning the thermal residual stress and strain rate influence on the yield surface of composites with different fiber off-axis angles have been reported. The prediction results under uniaxial tensile conditions are validated by experimental data of a FBGs strain test system. On this basis, the effects of thermal residual stress and strain rate on the yield surfaces of composites with different fiber off-axis angles are investigated
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