On the Interfacial Strength of Aluminum alloy / Epoxy Resin Adhesive and Loading Rate Dependency

Abstract

This study aims to evaluate the interfacial strength of aluminum alloy/epoxy resin adhesive by using two different tests of impact loading and quasi-static loading. For the impact test, laser shock adhesion test (LaSAT) was carried out. This method uses a strong shock wave induced by a laser ablation in order to apply the tensile stress at interface. The shock wave propagates from the back surface of substrate to interface. When the tensile stress wave reaches the critical value of interface, the delamination occurs. Since the magnitude of tensile wave is dependent on pulse laser energy, we gradually increase the laser energy to identify the critical energy for delamination. Moreover, the shock wave propagation was simulated in Finite Element Method (FEM). This numerical simulation calculates the applied tensile stress in the interface when the delamination occurs, and then we estimate the dynamic interfacial strength of Al alloy/epoxy resin. In addition, we carried out the uniaxial tensile test for estimating the quasi-static interfacial strength.