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

　　關(guān)鍵詞：焊接接頭，環(huán)境致裂，擴(kuò)展裂紋，力學(xué)場，數(shù)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(lián)系方式

　　薛何：xue_he@hotmail.com

責(zé)任編輯：趙澤南

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