摘要
针对海洋生活平台桩腿的齿条与筒体焊接变形问题,基于迭代子结构法(ISM)和多核并行计算技术的高效热-弹-塑性有限元计算代码,依据结构对称性的特点,建立实际齿条与筒体焊接结构的1/4有限元模型,预测的焊接变形和测量结果趋势一致,数值基本吻合。为了提高建造精度,采用在筒体内表面进行堆焊的工艺措施,产生反变形,抵消齿条与筒体焊接产生的变形,焊接变形量可减70%。
Focusing on the welding deformation between rack and cylinder welding in leg structure of living offshore, high effective thermal-elastic-plastic FE analysis with the iterative substructure method(ISM) and parallel computation was proposed for welding deformation prediction. The quarter FE model of rack and cylinder welded structure was established due to its symmetrical feature. The numerical result has a good agreement with those of measurement. In order to improve the fabrication accuracy, the bead-on-plate welding on inner surface of cylindrical leg structure was applied to generate inverse deformation for previous welding deformation mitigation; the welding deformation can be reduced by 70%.
引文
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