Nonlinear buckling analysis in patched hybrid composite plates by vacuum infusion method

In this study, the buckling behavior of layered hybrid composite plates has been investigated numerically and experimentally for notched and patched samples. In the experimental study; carbon-aramid woven fabric was chosen as hybrid material. The fabrics were cut to have the same orientation angle and the production of composite plates as four layers in a overlap was carried out in a temperature-controlled vacuum infusion production unit. Circular hole, U single edge and half circle double edge notches were formed in the experimental samples produced. Circular holed specimens were patched with a wet patch on one face and adhesion performance on the buckling load was investigated. In addition, buckling test results were compared for composite plates with and without nanoparticles in patch matrix material. In the numerical study; The buckling behavior of composite plates patched with nano-doped and non-doped wet patch method was realized with finite element package program ANSYS. As a result, numerical results describing nonlinear buckling behavior for plates were found to be consistent with experimental results. According to the results obtained; In general, the successful applicability of the wet patch method has been shown since there is no separation at the patch interface at the end of the buckling. Wet patch repair of circular hole samples increased the damage loads by 65% compared to non-hole samples. 1% by weight of CNT and graphene admixture to patch material with fiber angle parallel to loading direction increased damage loads by 22.5% and 12.6%, respectively, by 2% CNT and graphene admixture by 50% and 1% partial as the lowered.