A Self-consistent Model in the Local Residual Stress Evaluation of 316H Stainless Steel
The residual stresses in materials have a considerable effect on the mechanical properties,including creep and failure behaviour.Due to elastic and plastic anisotropy,differently oriented grains will exhibit different mechanical responses for a given macroscopic stress,leading to a variation of stresses within the grains.Experimental studies of meso-scale residual stress evolution can be used to validate crystal based plasticity and hardening models.In this paper,a self-consistent model and a simple multi-bar system are employed to determine how the evolution of the residual stress field depends on the constitutive assumptions for the individual grains.This framework has been used to evaluate data for the lattice strain evolution in 316H stainless steel measured from neutron diffraction experiments.A suitable model is identified,which captures the macroscopic response of the material and explains the way in which the meso-scale residual stresses evolve.The good agreement achieved between the self-consistent model and experiment demonstrates that this model reasonably reflects the mechanical physics of 316H stainless steel,and may help improve our understanding of the influence of the residual stress on the fracture and failure behaviour.
Residual stress Self-consistent model 316H stainless steel Neutron diffraction
Jianan Hu Bo Chen David Smith Peter Flewitt Alan C.F. Cocks
Department of Engineering Science,University of Oxford,OX1 3PJ,UK Department of Mechanical Engineering,University of Bristol,BS8 1TR,UK IAC,University of Bristol,BS8 1TR,UK
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）