The effect of nonlinear material behavior on stress analysis of composite plates

In this study, the analysis of the mechanical behavior of notched and pin-joint composite plates was carried out experimentally and numerically. In the study where single and double serial pin joints were used, [0^0 ]_8 layered composite plates reinforced with epoxy resin matrix and woven glass fibers were used. Stress-strain behavior in composite materials is generally linear. However, it deviates from linearity in the case of using thin-section materials or materials that are more ductile than carbon, such as glass. This situation causes an increase in the error rate in numerical analyzes made by accepting the material behavior as linear. In the study, linear and non-linear stress behavior and damage behavior of thin-section glass fiber epoxy composites were performed using the progressive damage analysis method in the finite element package program. In the experimental and numerical study, the effect of geometric parameters (E/D, M/D) on the mechanical behavior of the plate was investigated. In the numerical study, linear and nonlinear solutions were achieved using Hashin damage theory and compared with the experimental results. The comparison charts showed that the nonlinear damage analysis more consistent with the experimental results with respect to linear analysis results.