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表面粗糙度和内部非金属夹杂物这两种缺陷形式都会明显影响高强度钢FV520B-Ⅰ的疲劳寿命。以FV520B-Ⅰ的超声疲劳实验数据为基础,结合根据经典的断裂力学,将表面粗糙度以及内部非金属夹杂物与FV520B-Ⅰ疲劳寿命联系起来得到疲劳寿命预测基础模型。从实验数据中选取合适的疲劳数据对基础模型进行拟合,确定与FV520B-Ⅰ相关参数,从而分别建立了针对两种不同缺陷情况下FV520B-Ⅰ的疲劳寿命预测模型。疲劳寿命预测模型的建立为FV520B-Ⅰ的疲劳寿命研究作出了贡献,准确并有针对性的预测疲劳寿命对保障设备的正常生产运行有重要的意义。
Surface defects and internal non-metallic inclusions in both defects will significantly affect the high-strength steel FV520B-Ⅰ fatigue life. Based on the experimental data of FV520B-Ⅰ ultrasonic fatigue, combined with the classical fracture mechanics, the fatigue life prediction basic model was obtained by correlating the surface roughness and internal non-metallic inclusions with the fatigue life of FV520B-Ⅰ. Fatigue data were selected from the experimental data to fit the basic model, and the parameters related to FV520B-Ⅰ were determined. The fatigue life prediction models of FV520B-Ⅰ for two different defects were established respectively. The establishment of the fatigue life prediction model has contributed to the research on the fatigue life of FV520B-Ⅰ. Accurate and targeted prediction of fatigue life is of great significance to the normal production and operation of the equipment.