Application of Matrix Theory in Acoustic Testing Method for Interfacial Debonding of Adhesive Structure

作者：Ding Jun Cai; Wu Bin; He Cun Fu

来源：Transactions of Beijing Institute of Technology, 2017, 37(3): 221-226 and 249.

DOI：10.15918/j.tbit1001-0645.2017.03.001

• Fluid-solid coupling
• Interfacial debonding
• Liquid solid coupling
• Multi-layered structure
• Reflection and transmission coefficients
• Two-layered structures
• Ultrasonic body waves
• Ultrasonic inspections

It is a difficult and challenging subject for ultrasonic inspection to test and evaluate the debonding interface of adhesive structure. Assuming, the debonding interface layer to be a fluid thin layer, the acoustic reflection and transmission coefficient expressions were derived based on the transfer matrix method for the body waves striking debonding structure with fluid-solid (gas-solid and liquid-solid) coupling interfaces. Firstly, this method was applied to a two-layered structure and the correctness of the method was verified by comparing with the existing results. Then, the influences of the incident angle and frequency changes of the acoustic wave on the body wave propagation characteristics were analyzed for adhesive structure with rigid interfaces and debonding structure with fluid-solid coupling interfaces. The results show that the propagation modes of the body waves in the multilayered structure mainly dependent on the incident angle, frequency and other parameters. The rigid interfaces, gas-solid and liquid-solid coupling interfaces can be distinguished in the case of the incident angle and frequency of the acoustic wave are appropriate. The research results provide a theoretical reference for identifying the adhesive interface debonding with ultrasonic spectrum technique.

• 出版日期2017
• 单位北京大学