Theoretical and Experimental Study on the Wave Propagation through a Micro Gap

Abstract

In the present paper, a preliminary exploration which includes the theoretical analysis and experimental study on the wave propagation through a micro gap was carried out. Harmonic waves, normal incidence, smooth and flat interface were taken into account. The theoretical and experimental results both show that the initial gap width has significant influences on the harmonics. Their relations may be effective on nondestructive evaluation of a pre-existing gap.

Propagation of harmonic waves through micro gap with consideration of frictional contact

“…For the higher frequency wave modes (m=2), the reflection and refraction coefficients, behaving in a similar way, first increase then decrease and finally reduce to zero at d/A 0 =1. The similar behavior was manifested experimentally and theoretically by the present authors and coworkers [17][18] for the case of smooth contact and normal incidence. Comparing Fig.…”