T型材角接焊的变形和残余应力分析  

Analysis of the deformation and residual stress of T-joint fillet weld

作　　者：张喜梅[1] 张世联[1] 胡铁牛[1] 

机构地区：[1]上海交通大学,上海200030

出　　处：《舰船科学技术》2008年第3期72-77,共6页Ship Science and Technology

摘　　要：T型材焊接不仅常用于现代造船工程中,而且在近海平台和桥梁建造中也得到广泛应用。焊接过程中,高温移动热源及之后的快速冷却,使得在焊缝及其附近区域产生了残留的拉应力,由此产生焊接变形和残余应力。焊接变形和残余应力的存在,将影响钢结构的建造质量及疲劳强度。为预测焊接变形,基于ANSYS有限元软件应用于对T型材焊接过程进行模拟,求解残余变形和残余应力分布情况,以及边界约束条件对它们的影响。通过分析可得出,焊缝上的各点在焊接过程中,加热时受压应力,冷却时受拉应力。在热影响区内,沿焊缝方向多为拉应力,垂直焊缝方向多为压应力,也符合纵向应力比横向应力大的特点。T-joint fillet welds are not only frequently used in modern shipbuilding, but also extensively used in offshore structures and bridge structures. In the welding process, moving high temperature and subsequent rapid cooling cause residual tensile stress at the weld and nearby fields, then become welding distortion and remnants stress. The welding transformation and the residual stress will affect the quality of steel structure and the fatigue intensity during the building period. In order to predict welding distortions, go along the simulation base on the T-joint welding process, resolve the distortions and the distribution of residual stresses, and also the effect coursed by the boundary restriction. We can get the results though analysis that, the weld will suffer the pressure stress by heating and pull stress by cooling. At the heating effect area, the pull stress will appear along the weld direction, and pressure stress will appear at the vertical direction of the weld. It is also fit the trait that the weld direction stress is larger than the vertical direction stress.

关 键 词：T型焊接 残余应力 ANSYS有限元 间接耦合 

分 类 号：U671[交通运输工程—船舶及航道工程]