Failure behavior of four-directional braided composites under tensile loading

초록

Three-dimensional braided composites have distinct features in a strength point of view that include better out-of-plane stiffness and no failure in delamination and interlaminar crack compared to conventional composite laminates. Researchers consider the fourdirectional braided composites as a future composite, mainly in the automobile and aerospace [1]. Many researchers have recently been introducing microscale models and mechanical stiffness prediction; the study towards failure behavior is still being investigated [2].This work aims to develop a failure model to predict its behavior for 3D four-directional braided composite under tensile loading. Due to the repetition of mesoscale (10-3m) unit cell in the macro (100m) composite part, the mesoscale unit cell model is chosen for the study that covers yarn (fiber bundles) and matrix. Then the numerical study is performed to estimate the failure behavior; python script and Abaqus subroutine are used for the modeling and failure prediction. The effect of nonlinearity in yarn and matrix with progressive damage under tensile is studied. The results are verified by comparing with existing literature results. The proposed model will be beneficial for future failure calculation to reduce the cost and time of experiments.