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由于接头组织和材料力学特性的不均匀,特别是当焊接热影响区的硬化对应力腐蚀破裂有重要的促进作用时,核电一回路316L管道焊接接头的应力腐蚀裂纹更容易扩展。考虑到焊接力学不均匀性,本文分析了恒应力强度因子(KI)和恒载荷条件下316L管道焊缝扩展裂纹尖端的局部应力应变场。研究结果表明,由于焊接力学不均匀性和裂纹长度的影响,恒KI和恒载荷条件下,扩展裂纹端部力学场有很大差异;恒载荷对扩展裂纹尖端应力应变的影响比恒KI要大得多。
Due to the non-uniformity of joint structure and material mechanical properties, stress corrosion cracking of 316L pipe joints of nuclear power primary circuit can be more easily extended, especially when the HAZ hardening has an important role in stress corrosion cracking. Considering the inhomogeneity of welding mechanics, the local stress and strain fields of 316L pipe welds at crack tip under constant stress intensity factor (KI) and constant load are analyzed. The results show that due to the influence of welding mechanics inhomogeneity and crack length, the mechanical field at the crack tip is greatly different under constant KI and constant load. The effect of constant load on the stress and strain of crack tip is larger than that of constant KI Much more.