摘要
针对5种不同焊接加固模式,建立了输电塔主材角钢焊接加固构件应力及变形的三维数值分析模型。依据热弹塑性理论,对不同加固模式下角钢主材焊接加固构件应力和变形进行了模拟计算,分析了其应力和变形特征,并与负载条件下计算结果进行比较,探讨了加固模式对塔材焊接加固构件应力、变形及负载能力的影响。研究结果表明,对于不同加固构件,焊缝及近缝区存在应力集中,等效应力接近材料屈服强度,但高应力区域较窄。加固模式Ⅲ、Ⅳ和Ⅴ的最大焊接残余变形量较小,约6 mm;在20000 Pa外载荷条件下,加固构件的纵向应力和等效应力分布基本没有变化;而横断面为矩形时,加固件承载能力比其它模式相对较强。
For five different welding reinforcement modes, a three-dimensional numerical model of stress and deformation of angle steel welded reinforcement pieces of power transmission tower was established. Based on thermal-elastic-plastic theory, the residual stresses and distortions in welding of angle steel structure under different welding reinforcement modes were calculated and their stress and distortion feature were analyzed, which was also compared with that under load conditions. The effects of the reinforcement modes on the stress and deformation of angle steel component were discussed. The results show that, for different reinforced components, the stress concentration occurs in and near weld zone.The Von-Mises equivalent stress is closed to the yield stress of base metal. But, the region with high stress is relatively narrow.The maximum deformations of reinforcement mode Ⅲ,Ⅳ and Ⅴ are relatively small, which are about 6 mm. Under the condition of 20000 Pa external load, the longitudinal stress and equivalent stress distribution of the reinforcement component are basically unchanged. The carrying capacity of the welded reinforcement structure with rectangular cross section is relatively better compared with these of the other reinforcement modes.
作者
杜宝帅
张忠文
钱红伟
邓化凌
胥国祥
李新梅
索帅
DU Baoshuai;ZHANG Zhongwen;QIAN Hongwei;DENG Hualing;XU Guoxiang;LI Xinmei;SUO Shuai(State Grid Shandong Electric Power Research Institute,Ji'nan 250002,China;Key Laboratory of Advanced Welding Technology of Jiangsu Province,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《热加工工艺》
北大核心
2021年第13期133-138,141,共7页
Hot Working Technology
基金
国网山东省电力公司科技项目(52062618001T)。
关键词
输电塔
残余应力
残余变形
数值模拟
焊接加固
power transmission tower
residual stress
residual deformation
numerical simulation
welding reinforcement
作者简介
杜宝帅(1982-),男,山东枣庄人,正高级工程师,博士,主要从事焊接冶金、数值模拟、激光材料加工研究,电话:0531-67982894,E-mail:dubaoshuai@163.com。
