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运用悬臂弯曲应力腐蚀破裂（ＳＣＣ）试验的方法，研究了低强钢焊接接头的应力腐蚀裂纹（ＳＣｃｒａｃｋ）的亚临界稳定扩展问题．提出了用弹塑性断裂力学（ＥＰＦＭ）参量ＪＭ描述应力腐蚀裂纹尖端应力应变场；分析了在ＳＣＣ条件下ＪＭ的计算方法，通过试验与计算测得了焊接接头各区的ｄａ／ｄｔＪＭ曲线，并分析了各区的ＳＣＣ敏感性大小
Using the method of Cantilever Bending Stress Corrosion Cracking (SCC), the subcritical stable propagation of stresscracking crack in low-strength steel welded joints was studied. The elastic-plastic fracture mechanics (EPFM) parameter JM is used to describe the stress-strain field of stress corrosion cracking tip. The calculation method of JM under SCC conditions is analyzed. The da / dt-JM curves of the welded joints are obtained through the experiments and calculations The sensitivity of SCC in each area was analyzed