Nonlinear Computational Welding Mechanics for Large Structures
Nonlinear Computational Welding Mechanics for Large Structures
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DOI：
10.1115/1.4041395
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
K. Ikushima;M. Shibahara
中科院分区：
文献类型：
--
作者：
K. Ikushima;M. Shibahara
在包括船舶在内的薄板钢结构的建造中，焊接被广泛用于连接部件。薄板结构在焊接过程中不可避免地会产生变形，从而产生各种问题。本文提出了一种基于热弹塑性分析方法的大型结构施工变形预测分析方法。该方法采用了一种高速热弹塑性分析方法--理想化显式有限元方法，并将代数多重网格法引入该方法以实现对大型薄板结构的高效分析。为了考察该方法的分析精度和性能，将该方法应用于一个简单加筋结构的焊接变形分析。将该方法应用于某船体建造过程中的焊接变形预测。计算结果表明，改进的方法具有与传统方法基本相同的分析精度，而计算速度明显快于传统方法。该方法可以分析由1000多万个自由度组成的船体结构的焊接变形，这是常规方法难以求解的。
In the construction of thin plate steel structures, including ships, welding is widely used to join parts. Welding inevitably causes deformation in thin plate structures, which may cause various problems. In the present study, an analysis method is developed to realize the prediction of deformation during the construction of large-scale structures based on the thermal elastic plastic analysis method. The developed method uses the idealized explicit finite element method (IEFEM), which is a high-speed thermal elastic plastic analysis method, and an algebraic multigrid method (AMG) is also introduced to the IEFEM in order to realize an efficient analysis of large-scale thin plate structures. In order to investigate the analysis accuracy and the performance of the developed method, the developed method is applied to the analysis of deformation on the welding of a simple stiffened structure. The developed method is then applied to the prediction of welding deformation in the construction of a ship block. The obtained results indicate that the developed method has approximately the same analysis accuracy as the conventional method, and the computational speed of the developed method is dramatically faster than that of the conventional method. The developed method can analyze the welding deformation in the construction of the ship block structure which consists of more than 10 million degrees-of-freedom and is difficult to solve by the conventional method.