Abstract

Contact acoustic nonlinearity (CAN) is well-known source in nonlinear ultrasonic, resulting from the interaction of a finite-amplitude wave with contact-type defects, including imperfectly bonded interfaces, closed fatigue cracks, and composite delaminations. Practical nonlinear ultrasonic wave propagation involves complex boundary conditions and need to be studied delicately. A numerical study was performed to investigate the interactions between elastic waves and a closed crack of different orientations under various prestresses. Validated FE models of both clapping and slipping mechanisms using proper boundary conditions were extended to investigate the nonlinear interaction between an arbitrary elastic wave and a general contact interface. The transmission, second harmonic and third harmonic coefficient as a function of static prestress and orientation angle are obtained. This work leads to possibilities in NDE applications to quantitatively evaluate the size and orientation of closed cracks.

How to Cite:

Yuan, M. ., (2019) “Numerical simulation of ultrasonic wave interaction with a closed crack of different orientations under various prestresses”, Review of Progress in Quantitative Nondestructive Evaluation .