Neutron diffraction and numerical simulation to study the cutting induced relaxation of weld residual stress
Temperature and residual stresses were thermomechanically modeled in a 1000mm long welding plate based on the simplified variable length heat source. The stress relaxations were simulated as a function of the plate length after cutting of the initial weld specimen by using an element removal method and treating the prior stress field as the next cutting origin. Meanwhile residual stresses were sequentially measured in a weld with the length of 300mm and cut welds having 150, 10mm lengths for comparison using neutron diffraction. Both the modeling and experimental results of the residual stresses decrease from about 370 to OMPa as the total weld plate length decreases from 300mm to 10mm. It suggests that the minimum cutting length is about 300mm, which can prevent the stress relaxation less than 3％ of the initial stresses in a high-strength steel weld.
Residual stress Cut weld plate Stress relaxation Thermo-mechanical modeling Neutron diffraction
Wenchun Jiang Wanchuck Woo
Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, KoreaCollege of C Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
国际会议
2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012
济南
英文
75-81
2012-10-31（万方平台首次上网日期，不代表论文的发表时间）