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薄壁球壳TIG预变形焊接工艺的数值模拟

Keywords: 预变形焊接,薄壁球壳,数值模拟,子结构

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Abstract:

为解决大型薄壁球壳结构TIG预变形焊接的变形分析问题,提出了基于非线性数值计算程序的子结构分析方法.将整体结构分为法兰-蒙皮子结构和蒙皮主结构两部分.首先,对子结构进行预变形分析.在此基础上采用热-弹塑性分析方法对带有预应力的子结构进行焊接热应力场分析.最后将子结构与主结构组合,并释放约束,得到了焊接后整体结构残余应力及变形场.结果表明,当焊缝边缘预应力接近材料屈服强度,可以将最大残余变形削减65%.

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