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通过试件试验,揭示了ZG_(25)钢疲劳浅裂纹的长度与扩展速率和门槛值的关系,以及扩展速率与应力强度因子幅的变化关系。分析确定了ZG_(25)钢的浅裂纹最大尺寸。用有效应力强度因子幅,巫在其中引进材料的参数,作为裂纹扩展的控制参量,使浅裂纹和长裂纹的数据点处在同一个分布带内,即可用一个关系式来描述浅裂纹和长裂纹的扩展规律。
Through the test of the specimen, the relationship between the fatigue crack length and the expansion rate and the threshold value of ZG_ (25) steel was revealed, and the relationship between the expansion rate and the amplitude of stress intensity factor was revealed. The maximum crack size of ZG_ (25) steel was analyzed. With the effective stress intensity factor, the parameter in which the witch introduces the material as the control parameter for the crack propagation causes the data points of the shallow crack and the long crack to be in the same distribution band, a relationship can be used to describe the shallow crack and the long Crack propagation law.