Comparation of failure criterions for pin loaded composite plates under fatigue loads

In this study, the behavior of circular perforated and pin-loaded models of laminated composites under cyclic loads was obtained by progressive damage analysis. Experimental studies were also carried out to verify the numerical results the specimens. The strength and stiffness changes of the experimental specimens were obtained, and residual strength and stiffness graphs, which changed according to the number of cycles, were created. These parameters were used in the progressive damage analysis. In the numerical study, Hashin Damage Criterion was used for progressive damage analysis and the results were also compared with Puck Damage Criterion. Different damage criteria and problem types can be solved under fatigue load with the help of the subprogram written in ANSYS APDL. In this direction, after the verification of the numerical study with the experimental study, a parametric study was also carried out for the numerical analysis. At high cycle numbers for low loads in the experiments, crushing damage around the hole and shear damage at the plate edge became evident along with matrix damage. This damage behavior was consistent with the analyses performed with Puck. In the Hashin damage criterion, fiber compression damages were dominant, especially on the pin contact surface around the hole.