Simulation of Strain and Residual Stress in Nitriding Process
Tatsuo INOUE
Abstract:Based on the nitrogen distribution and associated volume dilatation in substrate during nitriding process evaluated in the first report of this series of papers, a method to simulate induced strain and elastic-plastic stress based on incremental strain hypothesis is proposed. Bearing in mind that the process is limited in the very thin layer of the substrate, stress and strain condition is carefully discussed to clarify to be plain stress state. Strain incremental theory by use of Prandtl-Reuss constitutive equation with bilinear stress-strain relation is applied. Simulated results on residual stress distribution gives reasonable correspondence with experiments. Key Words:Nitriding strain/stress, Plane stress condition, Strain incremental simulation, Residual stress