有限要素法を用いたCFRP/エポキシ接着剤界面のレーザー衝撃破壊シミュレーション

抄録

To reduce aircraft structural weight, Carbon Fiber Reinforced Plastics (CFRP) has been widely used. In addition, for the joining technology of dissimilar materials, adhesive bonding has been actively developed instead of mechanical fastening. For the practical use, it is important to clarify dynamic facture behavior of adhesive bonding subjected to impact loading as well as static mechanical characteristics. In this study, to evaluate interfacial fracture strength between CFRP and epoxy resin adhesive at high loading-rate, Laser Shock-wave Adhesion Test (LaSAT) was conducted. LaSAT can produce interfacial delamination using shock wave due to laser ablation. Moreover, to efficiently evaluate bonding strength with a reduction of experimental costs, LaSAT with CbA (Certification by Analysis) may be useful. For such an industrial claim, this study conduct FEM simulation to reproduce interfacial delamination by LaSAT. The present FEM simulated wave propagation and employed interfacial failure criterion, so that interfacial delamination was successfully reproduced in the numerical simulation.