摘要： 以安全端異種金屬焊接接頭為代表的核電關鍵焊接結構環境致裂已成為影響壓水堆長期安全運行的關鍵問題。研究表明，焊接接頭擴展裂紋尖端區域的高溫水環境、材料和力學因素是決定焊接結構材料環境致裂擴展速率的決定因素。為了準確了解力學性能不均勻性和殘余應力場共存條件下的焊接接頭擴展裂紋尖端的力學參量，本研究巧妙地利用彈塑性有限元方法，建立了擴展裂紋尖端局部應力分析方法、焊接接頭殘余應力場建立方法，以及焊接接頭不均勻材料力學性能的表征方法。 本文研究結果為準確分析焊接接頭環境致裂擴展裂紋尖端的力學參量，以及準確評價核電關鍵焊接結構材料環境致裂擴展速率提供了一種新的分析方法。

　　關鍵詞：焊接接頭，環境致裂，擴展裂紋，力學場，數值模擬

 Numerical Simulation Of Mechanical Field At Tip Of Environmentally Assisted Cracking In Welded Joints Of Nuclear Power Plant
Xue He^*,  Gong Xiaoyan ^*
* (School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China)

　　Abstract:Environmentally assisted cracking （EAC） in welded components, such as the safe-end dissimilar metal welded joints, is a critical issue affecting the long-term operation and safety of pressurized water reactor in nuclear power plants. Researches indicate that the aqueous environment, material and mechanical factors at the tip of growing crack are the critical factors of the EAC growing rate in welded structural materials. To understand the mechanical factors at the growing crack tip in welded joint with the mechanical heterogeneity and the residual stress in detail, the local stress analysis approach at the growing crack tip, the applied mode of the welded residual stress field and the definition means of welded mechanical heterogeneity are established in this study. The results provide a new approach for analyzing the mechanical factors at the EAC tip and accurately evaluating the EAC growth rate of welded structural materials in nuclear power plant

　　Key words:welded joint, environmentally assisted cracking, growing crack, mechanical field, numerical simulation

　　聯系方式

　　薛何：xue_he@hotmail.com

責任編輯：趙澤南

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