Development of idealized explicit FEM using GPU parallelization and its application to large-scale analysis of residual stress of multi-pass welded pipe joint
Development of idealized explicit FEM using GPU parallelization and its application to large-scale analysis of residual stress of multi-pass welded pipe joint
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DOI：
10.1007/s40194-015-0235-2
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发表时间：
2015-07-01
影响因子：
2.1
通讯作者：
Shibahara, Masakazu
中科院分区：
文献类型：
--
作者：
Ikushima, Kazuki;Itoh, Shinsuke;Shibahara, Masakazu
在本研究中，作者开发了理想化显式有限元法（IEFEM），以实现更短的计算时间和更低的内存消耗在焊接变形和残余应力分析。IEFEM由图形处理单元（GPU）并行化以实现更快的计算。为了表明其适用于大规模的问题，所提出的方法被应用到分析的多道焊的V形槽管接头，有1万个单元，13层，33个通道。分析中考虑了各向同性硬化、随动硬化和组合硬化，研究了硬化规则对残余应力分布的影响。结果表明，残余应力分布按各向同性硬化、复合硬化和随动硬化的顺序依次增大。此外，分析的残余应力和实验测量显示出良好的一致性。计算时间约为70 h。结果表明，该方法能够实时、准确地分析大范围的焊接残余应力问题。
In this research, the authors developed the idealized explicit finite element method (IEFEM) to achieve shorter computing time and lower memory consumption in analyses of welding deformation and residual stress. IEFEM was parallelized by a graphics processing unit (GPU) to achieve even faster computation. To show its applicability to large-scale problems, the proposed method was applied to the analysis of the multi-pass welding of V-groove pipe joint that has 1 million elements, 13 layers, and 33 passes. In the analysis, isotropic hardening, kinematic hardening, and combined hardening were considered to investigate the influence of hardening rule on residual stress distribution. As a result, it is found that residual stress distributions were larger in the order of isotropic hardening, combined hardening, and kinematic hardening. In addition, the analyzed residual stress and experimental measurements showed good agreement. The computing time was approximately 70 h. From these results, it was shown that IEFEM can analyze a large-scale welding residual stress problem in realistic time with high accuracy.