Development of Computer-aided nondestructive Evaluation Method of Welding Residual Stresses for Life Extension of Large Plants

大型设备延寿焊接残余应力计算机辅助无损评价方法的开发

• 批准号: 11305012
• 负责人: KOBAYASHI Hideo
• 金额: $ 15.07万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11305012/
• 关键词: Bead Flush Method; Eigen-Strain; Welding Residual Stresses; Reinforcement of Weld; Inverse Analysis; Life Extension; 適切化法; 残留応力; 溶接; 非破壊評価

Along and near the bead line of welded structures, there remain eigen-strains, such as thermal strain, plastic strain, and transformation strain. These produce welding residual stresses which have a significant effect on integrity of structures. For the life extension of those components, residual stresses must be evaluated nondestructively. In this study, a computer-aided nondestructive evaluation method was proposed. There, eigen-strain distributions are calculated by the inverse analysis from released elastic strains due to removal of reinforcement of the weld. Then residual stresses are evaluated by the commercial finite element code by imposing eigen-strains as initial strains.Firstly, a basic formulation was attempted for a thin welded plate. Its utility was confirmed by conduction computer simulations as well as experiments. Especially in experiments, results from proposed method were compared with those by the X-ray method, the hole drilling method and the sectioning method. It was shown that all the results obtained agreed very well.Then attempt was made to extend this method to thick welded plates as well as thin welded pipes. Simulations showed that proposed method may have utility for those problems.

焊缝沿着及焊缝附近存在热应变、塑性应变、相变应变等本征应变。这些会产生焊接残余应力，对结构的完整性有很大影响。为了延长这些部件的使用寿命，必须对残余应力进行非破坏性评估。在这项研究中，提出了一种计算机辅助无损评价方法。在那里，本征应变分布计算从释放的弹性应变，由于删除的焊缝钢筋的逆分析。然后，采用商业有限元程序，以特征应变作为初始应变，计算焊接薄板的残余应力。它的效用被证实了传导计算机模拟以及实验。特别是在实验中，将该方法与X射线法、钻孔法和切片法的结果进行了比较。结果表明，所得结果吻合较好，并尝试将该方法推广到厚板和薄壁焊管。仿真结果表明，该方法对解决这些问题具有一定的实用价值。

项目成果

Lee Hyoungno: "Thermo-Elasto-Plastic Analysis of Welding Eigenstrain and Its Application to the Bead-Flush Method"Proc.of the 25th Symposium on Fatigue. 83-86 (2000)

Lee Hyoungno：“焊接特征应变的热弹塑性分析及其在焊珠齐平法中的应用”第 25 届疲劳研讨会论文集。

中村 春夫: "ビードフラッシュ法の溶接配管への適用に関する基礎研究"日本機械学会2001年度年次大会講演論文集. 01-1(I). 403-404 (2001)

Haruo Nakamura：“焊道闪光法在焊接管道中的应用的基础研究”日本机械工程师学会 2001 年年会论文集 01-1(I) 403-404 (2001)。

Kumagai Katsuhiko: "Computer Aided Nondestructive Evaluation Method of Welding Residual Stresses by Removing Reinforcement of Weld"ASTM STP. 1389. 128-142 (2000)

熊谷胜彦：“通过去除焊缝钢筋的计算机辅助焊接残余应力无损评估方法”ASTM STP。

熊谷克彦: "余盛り除去法による溶接残留応力の解析援用非破壊評価(適切化法の導入とひずみ変化測定位置の最適化)"日本機械学会論文集. A65・634. 1397-1404 (1999)

Katsuhiko Kumagai：“通过多余堆去除法进行焊接残余应力的分析辅助无损评估（优化方法的介绍和应变变化测量位置的优化）”日本机械工程学会会刊A65·634。 (1999)