Stress analysis of two different types of cracks due to fatigue of cord-rubber composites has been carried out using micromechanical 2D and 3D finite element analysis. The von-Mises/Tresca stresses that characterize the severity of crack tips in rubber composites has been computed from the finite element analysis. Numerical results of von-Mises/Tresca stress values are presented for two crack types and crack sizes under transverse strain and shear strain loading conditions. The results presented demonstrate that crack type, loading, and crack size have a strong effect on the values of von-Mises/Tresca stresses. The results of the von-Mises/Tresca stress should help in estimating the severity of local failures in cord-rubber composites.
In this study, the strain rate sensitivity of a discontinuous short fiber reinforced composite and the strain rate effect on the damage evolution are investigated. The studied material is a polymeric composite with a polyamide 6.6 matrix reinforced with oriented randomly short glass fibers at a 50% weigh ratio (PA6.6GF50). Tensile tests at low and high strain rate are conducted. In addition, interrupted tensile tests are carried out to quantify the damage at specific stress levels and strain rates. To perform the interrupted tensile tests, an intermediate fixture is realized via double notched mechanical fuses with different widths designed to break at suitable stress levels. The damage is estimated by the fraction of debonded fibers and matrix fractures. Based on the experimental observations, it is concluded that the ultimate stress and strain, and the damage threshold are mainly governed by the strain rate. Furthermore, it is established that the considered composite has a non-linear dynamic behavior with a viscous damage nature.
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