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讨论了3种不同环境下腐蚀钢板表面形貌特征,通过假设锈蚀坑的近似几何尺寸,利用ANSYS及n Code Design Life软件,分析锈坑尺寸变化对钢板应力集中系数及疲劳寿命的影响规律。结果表明,随着锈坑深径比和宽长比的增大,应力集中系数逐渐增大且疲劳寿命逐渐减小并趋于稳定;基于深径比及宽长比的半椭球体锈坑应力集中系数计算模型,得出锈坑深度相对于半径对疲劳寿命影响逐渐增大,锈坑宽度相对于长度对疲劳寿命影响逐渐增大的基本规律。
The surface topography of the steel plate under three different environments was discussed. The influence of the size of the rust pits on the stress concentration factor and fatigue life of the steel plate was analyzed by assuming the approximate geometric dimensions of the corrosion pits and the software ANSYS and n Code Design Life. The results show that with the increase of depth-diameter ratio and width-length ratio, the stress concentration factor gradually increases and the fatigue life decreases gradually and tends to be stable. The stress of the semi-ellipsoid rust pits based on the aspect ratio and the aspect ratio The calculation model of concentration coefficient obtained the basic rule that the effect of rust pit depth on the fatigue life increases with the radius and the effect of rust pit width on the fatigue life increases.