文献类型：会议论文

英文题名：Deformation-induced microstructure effects on ultrasonic waves: Simple shear versus pure shear

作者：Tang, S.H.[1]; Wu, S.[1]

机构：[1] East China University of Science and Technology, Shanghai 200237, China

会议论文集：Proceedings of 2006 ASME Pressure Vessels and Piping Division Conference - ASME PVP2006/ICPVT-11 Conference - Pressure Vessel Technologies for the Global Community

会议日期：July 23, 2006 - July 27, 2006

会议地点：Vancouver, BC, Canada

语种：英文

外文关键词：Finite element method - Fractals - Microstructure - Plastic deformation - Point defects - Polycrystalline materials - Ultrasonic waves - Velocity measurement - Wave effects

摘要：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. Copyright ? 2005 by ASME.