研究了不同极化电位下高强钢在3.5%NaCl溶液中疲劳裂纹扩展速率的变化规律. 在强阴极极化(-1100 mV~1200 mV)和阳极极化(-200 mV~400 mV)条件下,高强钢腐蚀疲劳裂纹扩展寿命明显缩短, 而极化电位为-800 mV~1000 mV时, 高强钢腐蚀疲劳寿命延长. 在Paris经验公式的基础上,引入环境加速因子C(E), 建立裂纹扩展速率da/dN与极化电位E之间的关系模型. 依据此模型计算的数值与实验值的平均相对误差小于9%,模型精度满足工程应用的要求.
The corrosion fatigue crack propagation (CFCP) behavior of high strength steel under various polarization conditions was investigated. It was found that the CFCP life was shortened when the intense cathodic (-1100 mV~-1200 mV) and anodic (-200 mV~-400 mV) polarization potentials were applied. However, the CFCP life was prolonged with cathodic polarization potentials at -800 mV~1000 mV. A model of the relationship between CFCP rate da/dN and polarization potential E for the high strength steel was established. The average relative error between experimental and calculated CFCP rates was less than 9%. The results indicated that the model might completely be satisfied with the engineering precision requirement.
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