Deformation-Induced Microstructure Effects on Ultrasonic Waves: Simple Shear Versus Pure Shear

Abstract

Although similar in total strain in simple shear and pure shear, they are very diverse in deformation modes, and the effect of these deformation modes on ultrasonic waves is very different. This paper aims to investigate deformation-induced microstructures and their effects on ultrasonic waves under simple and pure shear states. Texture evolutions, plastic spins, point defects induced by cross slips and fractal dimensions are analyzed via finite element polycrystal model. The investigation indicates that the texture evolutions are the same and transverse wave velocities depend on textures mainly; however, the point defects induced by cross slips show a striking difference between simple shear and pure shear, this implies that longitudinal wave velocities are sensitively influenced by point defects during plastic deformation.