【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
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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甥性应变的框架下的拉伸,虽然焊缝承受拉伸塑性应变,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.
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