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裂尖应力和应变是影响核电关键焊接接头应力腐蚀开裂速率的主要因素之一,裂尖高应变区的金属蠕变会造成裂尖力学场的变化,并对应力腐蚀开裂速率产生影响。本文以紧凑拉伸试样为研究对象,采用ABAQUS有限元软件,分析了裂尖高应变区蠕变对裂尖应力和应变的影响。结果表明,蠕变能显著缓解裂尖区域的应力集中现象,而对裂尖区域的等效塑性应变影响较小。裂纹尖端不同方向处的应力随蠕变时间的增加而减小,裂尖蠕变量随着裂尖距离的增大而减小,0°方向的应力值和蠕变量最大。
Crack tip stress and strain are one of the main factors that affect the rate of stress corrosion cracking in critical welded joint of nuclear power plant. The creep of metal in the crack tip high strain area will cause the change of crack tip mechanical field and affect the rate of stress corrosion cracking. In this paper, a compact tensile specimen is taken as the research object. The ABAQUS finite element software is used to analyze the influence of creep on the crack tip stress and strain in the high strain zone. The results show that creep energy can significantly relieve the stress concentration in the crack tip area, but has little effect on the equivalent plastic strain in the crack tip area. The stress in different directions of the crack tip decreases with the increase of creep time. The crack tip creep decreases with the increase of crack tip distance, and the stress and creep in 0 ° direction are the largest.