CFRP積層材の低エネルギ衝撃損傷評価に関する研究

第2報, 損傷力学に基づく数値解析手法の適用

抄録

The aim of this study is to establish a convenient evaluation method of the residiral strength after impact with low energy considering damage development of CFRP laminates by FEM. In this paper, we have developed a numerical simulation program on damage development considering the angles of transverse cracks to the loading direction based on damage mechanics. The angle of transverse cracks were not 90^° to the loading direction and changed with the distance from the impact point. It is revealed that the numerical results of crack angles have a same tendency with the experimental results, and the mechanical behaviors of transverse cracks and delamination, which are difficult to observe with experiments, can be clarified. We have also proposed an evaluation method of bending after impact (BAI) test instead of CAI, and the residual strength after impact is evaluated by the proposed method. The numerical results of the residual strength after the occurrence of damages have a good agreement with experimental results. From these results, it is recognized that the proposed numerical method is more convenient than CAI.