FINITE ELEMENT ANALYSIS OF CREEP DAMAGE FOR WELDED JOINT OF HIGH TEMPERATURE COMPONENT
By the finite element analysis code ABAQUS and the function of coupling process between heat and stress, the welding residual stress of welded joint for Cr5Mo furnace tube was analyzed firstly, and the distribution of welding residual stress of welded joint was obtained. Then according to the theory of damage mechanics, ABAQUS user subroutine of the modified Kachanov-Rabotnov (K-R) constitutive equation was developed. Creep damage of welded joint was simulated by the user subroutine on consideration of the welding residual stress of welded joint for the tube. The distribution of creep stress and damage was obtained after the tube was in service for different hours. The results indicate that the hoop welding residual stress of welded joint for the tube is highest. Although the welding residual stress is relaxation at initial stage rapidly, the initial stress accumulative damage has much effect on the welded joint. The distribution trend of damage is similar to that of initial welding residual stress, and which shows that the welding residual stress has a great influence on the creep damage of welded joint.
ZHANG Guodong ZHOU Changyu
School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）