Development of Numerical Estimation Technique for Production of Welded Structure with High Accuracy

焊接结构高精度生产数值估算技术的开发

• 批准号: 15206080
• 负责人: MURAKAWA Hidekazu
• 金额: $ 31.53万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15206080/
• 关键词: Welding Distortion; Finite Element Method; Thermal Elastic Plastic Analysis; Nonlinearity; Parallelization; 固有変形; 界面要素; 溶接順序; 逆解析; 残留応力

Most of the construction processes in the welded structures is the thermal working, which is phenomenally a kind of unsteady and nonlinear behavior. An objective of this research was to visualize and reveal such a nonlinear behavior by using various simulation methods based on the computational science. The main results in this study were as follows;(1) The inherent deformation method, in which the inherent deformation is introduced into the elastic finite element method (FEM) as the initial strain, is one of the effective methods to predict the plate panel welded structures such as ships and bridges. Where, the values of the inherent deformations for various weld joints must be known beforehand. So, in this study, a simple and efficient method to estimate inherent deformation of typical weld joints by using inverse analysis was developed and its validity was revealed through the examinations for joint specimens and large structures.(2) FEM is a powerful tool to predict the welding residual stresses and deformations. However, the three-dimensional (3D) thermal-elastic-plastic FE analysis requires very long computational times and most of the previous computations using 3D-FEM were limited to simple problems such as a bead-on plate welding and a butt joint welding. So, in this research, an iterative substructure method was developed as a method to reduce the computational time in 3D analysis based on the understanding that the welding problem is a strong nonlinear transient problem and the nonlinearity in welding is much localized. By using this method, the computing time was accelerated more than 10 times and the welding distortion of a part of the practical structure under a single pass welding can be analyzed. Also, it was succeeded to analyze and quantitatively predict the welding distortion of a part of nuclear reactor after multi pass welding.

焊接结构的施工过程主要是热加工过程，热加工过程是一种非稳态、非线性行为。本研究的一个目的是通过使用基于计算科学的各种模拟方法来可视化和揭示这种非线性行为。（1）固有变形法是将固有变形作为初始应变引入到弹性有限元法中的一种方法，是预测船舶、桥梁等壁板焊接结构的有效方法之一。其中，必须事先知道各种焊接接头的固有变形值。为此，本文提出了一种简单有效的利用反分析方法估算典型焊接接头固有变形的方法，并通过对接头试件和大型结构的试验验证了该方法的有效性。(2)有限元法是预测焊接残余应力和变形的有力工具。然而，三维（3D）热弹塑性有限元分析需要很长的计算时间，大多数以前的计算使用3D-FEM仅限于简单的问题，如焊缝上板焊接和对接接头焊接。因此，在这项研究中，一个迭代子结构方法被开发作为一种方法，以减少计算时间在三维分析的基础上的理解，焊接问题是一个强非线性瞬态问题和焊接中的非线性是非常本地化。采用该方法，计算速度提高了10倍以上，并可对实际结构的某部位进行单道焊的焊接变形分析。并成功地对某核反应堆部件多道焊后的焊接变形进行了分析和定量预测。

项目成果

Actual Application of FEM to Analysis of Large Scale Mechanical Problem in Welding

有限元在焊接大型力学问题分析中的实际应用

• 发表时间: 2007
• 期刊: Science and Technology of Welding and Joining Vol. 12 No. 2
• 作者: 横田幸哉;羽藤英二;H.Nishikawa
• 通讯作者: H.Nishikawa

大規模溶接シミュレーション手法の高速化に関する検討

加速大型焊接模拟方法研究

• 发表时间: 2006
• 期刊: 溶接構造シンポジウム2006講演論文集 Vol. 2
• 作者: M.Karppinen;H.Yamauchi;S.Otani;T.Fujita;T.Motohashi;Y.-H.Huang;M.Valkeapaa;H.Fjellvag;S.Okamura et al.;西川弘泰
• 通讯作者: 西川弘泰

Fast Computational Scheme for Large Scale Nonlinear Transient Problems in Welding Mechanics

焊接力学中大规模非线性瞬态问题的快速计算方案

• 发表时间: 2005
• 期刊: Advances in Computational & Experimental Engineering and Sciences 2005, Proceedings of the 2005 International Conference on Computational & Experimental Engineering and Sciences (ICCES'05) Chapter 2(CD-ROM)
• 作者: Shobhakar Dhakal;Keisuke Hanaki;Ai Hiramatsu;H.Murakawa
• 通讯作者: H.Murakawa

H.Murakawa: "Simulation of Resistance Welding for Selection of Optimum Welding Conditions and Process Control"Transactions of JWRI. Vol.32 No.1. 215-218 (2003)

H.Murakawa：“用于选择最佳焊接条件和过程控制的电阻焊接模拟”JWRI 交易。

D.Deng, Y.Luo, H.Serizawa, M.Shibahara, H.Murakawa: "Numerical Simulation of Residual Stress and Deformation Considering Phase Transformation Effect"Transactions of JWRI. Vol.32 No.2. 325-334 (2003)

D.Deng、Y.Luo、H.Serizawa、M.Shibahara、H.Murakawa：“考虑相变效应的残余应力和变形的数值模拟”JWRI 汇刊。