STRESS EFFECT ON BOUNDARY-CONDITIONS AND ELASTIC-WAVE PROPAGATION THROUGH AN INTERFACE BETWEEN ANISOTROPIC MEDIA

Elastic wave propagation through a plane interface between two general ly anisotropic stressed solids is considered. The case when one solid is replaced with fluid is considered separately due to its importance for the development of immersion techniques for ultrasonic stress dete rmination. The incident wave plane can coincide with or deviate from p lanes of material symmetry. Static stresses are assumed to be locally homogeneous and to satisfy static boundary conditions. The analysis is applicable for both applied and residual stresses. For numerical impl ementation a method and an analysis of the reflection-refraction probl em on the boundary of separation between two anisotropic solids [Rokhl in et al., J. Acoust. Soc. Am. 79, 906 (1986)] is modified to take str esses into account. Simulations are performed to implement the theory described and to clarify the stress effect on elastic wave interaction with a solid interface. Changes in propagation directions, polarizati ons, and energy transmission and reflection coefficients due to the pr esence of stresses are discussed. The stress-induced birefringence is explored quantitatively. Conditions for destructive interference of sh ear waves are presented. (C) 1998 Acoustical Society of America. [S000 1-4966(98)05909-8]