DH36高强度船板钢对接焊残余应力与变形数值模拟与试验分析  

Numerical Simulation and Experimental Analysis of Residual Stress and Deformation in DH36 High-strength Ship Plate Steel Butt Welding

作　　者：苗玉刚 王林[1] 王子然 卓振坚 林春香 谭国平 谢祖靠 MIAO Yu-gang;WANG Lin;WANG Zi-ran;ZHUO Zhen-jian;LIN Chun-xiang;TAN Guo-ping;XIE Zu-kao(National Key Laboratory of Science and Technology on Underwater Vehicle,Harbin Engineering University,Harbin 150001,China;CSSC Huangpu Wenchong Shipbuilding Company Limited,Guangzhou 511462,China)

机构地区：[1]哈尔滨工程大学水下机器人技术国家级重点实验室,哈尔滨150001 [2]中船黄埔文冲船舶有限公司,广州511462

出　　处：《武汉理工大学学报》2023年第10期104-111,共8页Journal of Wuhan University of Technology

基　　金：国家自然科学基金面上项目(51975138);工信部高技术船舶科研项目(CJ05N20)。

摘　　要：为了解某大洋开采船钻台面分段合拢焊缝产生的焊接变形和残余应力,对局部焊接接头结构即DH36高强度船板钢多层多道对接焊产生的焊接变形和残余应力进行了数值模拟和试验分析。为了提高数值模拟的准确性,基于热弹塑性理论,以SYSWELD软件为计算平台,建立了基于固态相变的三维“热-冶金-机械”耦合的多物理场热弹塑性有限元计算方法。数值模拟与试验结果表明,DH36多层多道对接焊主要产生角变形;焊缝及近焊缝区沿着焊接方向的纵向残余应力主要为拉应力;横向残余应力分布比较复杂,沿着中央横截面上表面除了在最后一道焊缝及其附近是压应力其余为拉应力。数值模拟与试验结果误差很小,考虑固态相变因素的热弹塑性有限元法可以对焊接变形和残余应力进行准确的预测。To gain insight into welding deformations and residual stresses induced by the closure weld on the surface of an oceanic mining vessel's drilling platform,we conducted numerical simulations and experimental analyses.Specifically,we focused on the welding deformations and residual stresses resulting from multi-layer,multi-pass butt welding of DH36 high-strength ship plate steel.In this study,in order to improve the accuracy of the numerical simulation,a three-dimensional"thermal-metallurgical-mechanical"coupled multi-physics thermal elastic-plastic finite element method based on solid-state phase transformation was developed using SYSWELD software as the computational platform.Numerical simulation and experimental results show that the DH36 multi-layer multi-pass butt welding mainly produces angular deformation;the longitudinal residual stresses in the weld and near-weld area along the welding direction are mainly tensile stresses;the distribution of transverse residual stresses is more complex,along the upper surface of the central cross-section except for the last weld and its vicinity are compressive stresses and the rest are tensile stresses.The numerical simulation results have very little error compared to the experimental results,so the thermal elastic-plastic finite element method,which takes into account the solid-state phase transformation factor,can give an accurate prediction of welding deformation and residual stress.

关 键 词：DH36钢 焊接变形 焊接应力 数值模拟 热弹塑性有限元法 固态相变 

分 类 号：TG404[金属学及工艺—焊接]