Thermal elastic-plastic stress-strain analysis considering temperature rise due to plastic deformation under dynamic loading in undermatched joints

摘要

A heat-stress coupling FEM analysis considering the temperature rise effect under high-speed plastic deformation is used to model the behaviour of structural steels subjected to a dynamic loading and undermatched welded joints with strength heterogeneity. That is to say, to understand the mechanical properties and temperature rise behaviours of the sample steels at various strain rates and test temperatures, a thermal elastic-plastic analysis considering heat and stress coupling is performed, the analytical and experimental results are compared, and the stress-strain characteristics of structural steels and undermatched joints subject to a dynamic loading and the temperature rise histories under high-speed plastic deformation are investigated. The results suggest that, for both the undermatched joints and structural steels as homogeneous materials, the analytical results determined by the proposed model are well able to simulate the experimental results until fracture, including fracture beyond the maximum loading point, with good accuracy.The authors' thanks are due to Mr T Michiaki, Kawasaki Heavy Industries Corporation, Mr K Hashida, Katayama Stratek KK, and Mr T Kawabata, Sumitomo Metal Industries Corporation, for their many helpful comments and suggestions during the course of this study.