To enrich the detection methods of interface morphology for multi-layer composite materials,an acoustic wave propagation interface matrix model was constructed.The debonding and water inlet statuses of adhesive structure interfaces were simulated by using the air and water respectively,the expressions of acoustic reflection and transmission coefficients in multi-layer structure with transverse wave incidence were deduced,the interaction between ultrasound and different interfaces was studied,and the influence of incident angle on the propagation characteristics of acoustic waves was analyzed.The results show that when the incident angle of transverse wave is between 30°～40° or 30°～60°,the well-connection,debonding and water inlet interfaces can be better identified by using the reflection coefficient method or transmission coefficient method of transverse wave,respectively.In addition to 0°,the critical angle and 90°,interface morphology can also be easily identified by using the longitudinal wave transmission coefficient method.Regardless of the incident angle of the transverse wave,the method of longitudinal wave reflection coefficient cannot distinguish the debonding and water inlet interfaces.The proposed method provides a basis for the experimental detection of adhesive structure by ultrasound.
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