CRH2A型动车组缓冲梁结构焊接残余应力的有限元模拟*
朱瑞栋, 男, 1988年生, 硕士生
收稿日期: 2013-12-24
修回日期: 2014-03-05
网络出版日期: 2014-08-25
基金资助
* 国家自然科学基金项目51104142和青岛四方课题项目四合2011技开龚字第254号资助
FINITE ELEMENT SIMULATION OF WELDING RESIDUAL STRESS FOR BUFFER BEAM OF CRH2A HIGH SPEED TRAIN
Received date: 2013-12-24
Revised date: 2014-03-05
Online published: 2014-08-25
Supported by
Supported by National Natural Science Foundation of China (No.51104142)
朱瑞栋 , 董文超 , 林化强 , 陆善平 , 李殿中 . CRH2A型动车组缓冲梁结构焊接残余应力的有限元模拟*[J]. 金属学报, 2014 , 50(8) : 944 -954 . DOI: 10.11900/0412.1961.2013.00832
A finite element model of the buffer beam is established and the distribution of the welding residual stress is investigated by the finite element method. The results show that the calculated stress agrees well with the measured stress by the indentation strain-gage method. There are large and nonuniform residual stresses in the edge of the bottom flange and the processing hole. The welding of the workpieces hanging has an important effect on the residual stresses of the bottom flange. The replacement of A7N01 aluminum alloy with A6N01 aluminum alloy as the base metal can effectively reduce the residual stresses of the buffer beam. When the reinforcement plate is integrally formed with the buffer beam, the residual tensile stresses near the original weld are reduced remarkably. Two welders operating simultaneously on the opposite welds can significantly reduce the residual tensile stresses of the bottom flange.
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