Development of parallelized analysis system of welding deformation for mega steel construction.

巨型钢结构焊接变形并行分析系统开发

• 批准号: 22760634
• 负责人: ITOH Shinsuke
• 金额: $ 2.16万
• 依托单位: Osaka Prefecture University (2011)Osaka University (2010)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22760634/
• 关键词: 材料; 構造工学; 溶接変形; 有限要素法

Welding is one of the essential processes for assembling steel structures such as ships and bridges. However, it is impossible to avoid residual stress and distortion. To prevent or minimize these problems, quantitative prediction and effective control of welding residual stress and deformation are necessary.To compute welding deformation, two methods are often used. One is the thermal elastic plastic finite element method(FEM) and the other is elastic FEM using inherent deformation. Thermal elastic plastic FEM is effective for accurate evaluation of welding deformation but requires large computational time. Elastic FEM using inherent deformation requires very short computational time, but the inherent deformations of all welding joints composing the structure must be known beforehand. However, these two methods can be combined to take advantage of both. The inherent deformations of welding joints are computed using thermal elastic plastic FEM and stored in a database, which is used to compute the welding deformations of large structures using elastic FEM.Nevertheless, these methods for welding analysis can require very long computational time and memory, even if the model is a simple weld joint. Therefore, for faster calculations and analyzing large structures, we developed the iterative substructure method(ISM) and idealized explicit FEM for welding simulation. In this study, a thermal elastic plastic analysis using ISM is applied to a weld joint model. The plastic strain distribution obtained by ISM is used for inherent strain analysis using idealized explicit FEM to analyze a block model of a large ship. The block model is 8.5 m x 8.5 m x 4.4 m with more than 300 welding lines. The simulated results agree well with the measured distortion. In addition, the influence of the welding direction on the welding deformation of the targeted ship block is investigated.

焊接是船舶和桥梁等钢结构装配的基本工艺之一。然而，不可能避免残余应力和变形。为了防止或减少这些问题的发生，必须对焊接残余应力和变形进行定量预测和有效控制。一种是热弹塑性有限元法，另一种是考虑固有变形的弹性有限元法。热弹塑性有限元法是精确评价焊接变形的有效方法，但计算量大。使用固有变形的弹性有限元法需要非常短的计算时间，但是必须预先知道组成结构的所有焊接接头的固有变形。然而，这两种方法可以结合起来，以利用两者。焊接接头的固有变形采用热弹塑性有限元法计算并存储在数据库中，该数据库用于采用弹性有限元法计算大型结构的焊接变形。然而，这些焊接分析方法需要很长的计算时间和内存，即使模型是简单的焊接接头。因此，为了更快的计算和分析大型结构，我们开发了迭代子结构法（ISM）和理想化显式有限元焊接模拟。在这项研究中，热弹塑性分析，使用ISM适用于焊接接头模型。利用ISM得到的塑性应变分布，采用理想化显式有限元法对某大型船舶的块体模型进行了固有应变分析。模块模型为8.5 m x 8.5 m x 4.4 m，有300多条焊接线。仿真结果与实测结果吻合较好。此外，还研究了焊接方向对船体总段焊接变形的影响。

项目成果

理想化陽解法FE Mによる大型船体ブロックの固有ひずみ解析

使用理想化显式方法 FE M 进行大型船体固有应变分析

• 作者: 畑将司;伊藤真介;杉廣武俊;神尾淳;山下泰生;柴原正和;望月正人
• 通讯作者: 望月正人

Application of Inherent Strain Analysis Using Idealized Explicit FEM for Prediction of Welding Deformation in Ship Block Building

应用理想化显式有限元固有应变分析来预测船舶分段建造中的焊接变形

• 发表时间: 2011
• 期刊: The Proceedings of the 20th International Offshore and Polar Engineering Conference
• 作者: S.Itoh;M.Hata;M.Shibahara;M.Mochizuki
• 通讯作者: M.Mochizuki