Study on analysis model for simulating hot cracking phenomenon at heat affected zone of weldment

模拟焊件热影响区热裂纹现象的分析模型研究

• 批准号: 13450405
• 负责人: KITAMURA Mitsuru
• 金额: $ 6.21万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450405/
• 关键词: liquation crack; hot crack; finite element method; three-dimensional; elastic-plastic; elevated temperature; heat affected zone (NAZ); laser welding; 3次元熱伝導解析手法; 3次元熱弾塑性歪み解析手法; 電子ビーム溶接; 高温歪み計測; 溶接熱影響部; 3次元解析モデル; 相変化; 高温割れ; 非線形解析; 溶融凝固; 溶

The object of this study is to make clear and obtain hot crack phenomenon at the heat affected zone (HAZ) of a weldedment from the view point of dynamics. Especially, the main object is to investigate and propose the three-dimensional thermal elastic-plastic analysis model/method for the weldment under the conditions of elevated temperature and large nonlinearity. The summary of this study is as following.The new-type of the three-dimensional thermal elastic-plastic analysis model/method was proposed and validated, which was able to apply for laser/electron-beam welding methods in addition to an arc welding method. The high-accuracy analysis with finite element method was able to be proposed by using the new-type special method of setting of a material constant at elevated temperature, of dealing of a molten metal, of setting of a heat source and so on.The new-type method for accurate and dynamic measurement of the temperature and strain at the elevated temperature zone very near the molten part was investigated and proposed. Moreover an actual measurement by using the proposed method was carried out. The proposed new-type analysis method was able to be validated by comparing the analysis result to the measurement result in detail.Furthermore, the new-type evaluating/prediction method for liquation cracking at HAZ of a weldedment was proposed based on the equivalent-plastic strain obtained from the above analysis method.

本研究的目的是从动力学的角度阐明并获得焊接件热影响区的热裂纹现象。特别是研究并提出了高温、大非线性条件下焊接件的三维热弹塑性分析模型/方法。提出并验证了一种新型的三维热弹塑性分析模型/方法，该模型/方法除适用于弧焊方法外，还可以应用于激光/电子束焊接方法。利用高温下材料常数的设定、金属熔体的处理、热源的设定等新型的特殊方法，可以实现高精度的有限元分析。研究并提出了一种精确、动态地测量靠近熔融部分的高温区温度和应变的新型方法。并用所提出的方法进行了实际测量。通过将分析结果与测量结果进行详细对比，验证了所提出的新型分析方法的有效性。此外，基于该分析方法得到的等效塑性应变，提出了一种新型的焊接件热影响区液化裂纹评估/预测方法。

项目成果

M.Kitamura: "Prediction of Liquation Crack Initiation at HAZ of Laser Weldment Based on Strain Analysis at Elevated Temperature"Proc.of the Seventeenth Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures. TEAM-2003. 287-296 (2003)

M.Kitamura：“基于高温应变分析的激光焊接热影响区液化裂纹萌生预测”第十七届亚太海洋结构技术交流暨咨询会议记录。

M.Yamamoto, K.Shinozaki, M.Kitamura, M.Shirai: "Three Dimensional Strain Analysis on laser Weldment for Prediction of liquation Crack Initiation"Proc.of PLASTICITY'03:The Tenth International Symposium on Plasticity and its Current Applications. 502-504 (2

M.Yamamoto、K.Shinozaki、M.Kitamura、M.Shirai：“用于预测液化裂纹萌生的激光焊件三维应变分析”Proc.of PLASTICITY03：第十届国际塑性及其当前应用研讨会。

M.Kitamura, M.Hassan, K.Shinozaki, M.Yamamoto, A.Takata, M.Shirai: "Prediction of liquation Crack Initiation at HAZ of Laser Weldment Based on Strain Analysis at Elevated Temperature"Proc.of the Seventeenth Asian-Pacific Technical Exchange and Advisory Me

M.Kitamura、M.Hassan、K.Shinozaki、M.Yamamoto、A.Takata、M.Shirai：“基于高温应变分析的激光焊件 HAZ 处液化裂纹萌生预测”第十七届亚洲会议论文集

K.Shinozaki: "Prediction of Hot Crack Initiation at HAZ of Laser Weldment of Ni-base Superalloys (Report 2)"Manuscripts of the national meeting of The Japan Welding Society. 287-296 (2003)

K.Shinozaki：“Ni基高温合金激光焊接HAZ处热裂纹萌生的预测（报告2）”日本焊接学会全国会议手稿。

M.Yamamoto: "Prediction of Liquation Crack Initiation at HAZ of Laser Weldment Based on Strain Analysis at Elevated Temperature"Proceedings of the International Welding/joining Conference Korea 2002. 244-249 (2002)

M.Yamamoto：“基于高温应变分析的激光焊接 HAZ 液化裂纹萌生预测”韩国国际焊接/连接会议记录 2002. 244-249 (2002)