Comparison of Material's Surface Morphology under Simple and Pure Shear States Via Finite Element Method Analysis

Abstract

In the authors' series study on ultrasonic nondestructive evaluation method, longitudinal wave velocities propagating in the plastically deformed medium under simple and pure shear states were apparently different from each other. The investigation has suggested that the point defects induced by cross slip were one of the major reasons to cause such differences. As one of studies on this phenomenon, the current paper will present the authors extended investigation on how the surface morphology, i.e. surface roughness is developed under both shear states via finite element polycrystal model. Finally, the authors will also give a quantitative analysis on the irregularity of surface roughness via fractional dimensional analysis.