Impact Analysis of Fiber-reinforced Composites Based on Elasto-plastic Constitutive Law

Abstract

Impact analysis of 3D braided composites and laminated plane woven fabric composites was performed using the elasto-plastic constitutive law to describe the nonlinear, anisotropic and asymmetric properties of fiber-reinforced composites. As for the yield criterion, the modified Drucker—Prager yield criterion was utilized to represent the anisotropic and asymmetric properties, while the anisotropic hardening was described based on the kinematic hardening with the anisotropic evolution of the back-stress. Experiments to obtain the material parameters of the proposed constitutive law were also carried out based on uni-axial tension and compression tests for fiber-reinforced composites. Then, the proposed constitutive law was implemented into a finite element code and was verified by comparing the finite element simulation of the impact tests with experiments. In addition, impact performance of the braided composites and laminated composites was also compared with each other.

Fatigue study on the actuation performance of macro fiber composite (MFC): theoretical and experimental approach

“…In the present study, the flow rule Q is considered same as the yield criteria F. In general, hardening rule can be classified as kinematic and isotropic hardening. In order to predict the fatigue effects on composites using theoretical model, few literature studies suggested that the kinematic hardening rule can be used provided cyclic load has minimal effect on its performance [39][40][41]. From this experimental studies, it is identified that the fatigue load has minimal effect on the actuation performance of MFCs before sudden failure (refer figure 4).…”