钛合金焊接应力应变的数值模拟  

Simulation on welding stress and strain of titanium alloy

作　　者：李菊[1] 关桥[1] 郭德伦[1] 史耀武[2] 

机构地区：[1]北京航空制造工程研究所,100024 [2]北京工业大学,100022

出　　处：《焊接》2010年第2期14-17,共4页Welding & Joining

基　　金：航空基金资助项目(05H25014)

摘　　要：采用数值模拟方法研究在移动热源情况下钛合金焊接应力应变发展过程。研究结果表明:钛合金焊接应力应变发展模式与铝合金和不锈钢等材料不同。无论是在点状加热还是移动热源情况下,在残余状态,钛合金焊缝均处于卸载状态,并未达到拉伸屈服。熔池内的金属是在两侧有压缩塑性应变的框架下熔化的;冷却过程中,焊缝也是在已有的压缩塑性应变的框架下的拉伸,虽然焊缝承受扣伸塑性应变,但不足以完全抵消已产生的压缩塑性应变,残余状态仍为负的不协调应变。The welding stress and strain of titanium alloy welded with moving arc were simulated.The results showed that there are different welding stress and strain models among titanium alloy,aluminum alloy and stainless steel.In residual states of both spot are welding and moving are welding,the welds of titanium alloy are all in unloaded zones,the residual stresses are lower than the yield strength.The metal in the molten pool is melted in the frame of compress plastic strain near weld; in the cooling process,the weld is tensioned in the frame of existed compress plastic strain,the compress plastic strain in the weld can not be compensated completely by the tensile plastic strain,the residual strain is still a negative value.

关 键 词：钛合金 焊接 应变 数值模拟 

分 类 号：TG404[金属学及工艺—焊接]