An evaluation method of bonding strength at a bonded solid-solid interface by contact acoustic nonlinearity

Abstract

This paper presents a nondestructive method to evaluate the bonding strength of the interface of bonded solid-solid. It is based on a contact acoustic nonlinearity (CAN) phenomenon produced by a bonded solid-solid interface when a longitudinal wave propagates through the interface. The CAN model is set up to depict a bonded state by the relationship between the bonding strength and the crack width in the interface and the CAN parameter described by the ratio, 2 21 / AA , between the amplitudes of the second harmonic and fundamental waves. According to this model, a nondestructive evaluation of the bonding strength can be established. When the CAN parameter and the crack width are measured, the bonding strength can be evaluated from the model. In this paper, experiments have been done to demonstrate the model and the bonding strengths of some samples are evaluated based on the CAN method, The results (the example of 10.2kg/cm 2 by CAN model) are well agree with the bonding strengths (9.9 kg/cm 2 ) measured by hanging clogs to destroy their interfaces.