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在分析多轴疲劳几种常用非比例度定义的基础上,提出了一种非比例度定义方法,进而以American Society of Mechanical Engineers(ASME)规范案例中非比例加载多轴疲劳设计准则采用的应变参量作为基本损伤参量,发展了一种新的多轴疲劳寿命预测模型.结果表明:1所提出的非比例度定义可以描述任意已知轮廓的、非周期的、变幅的非比例加载路径;2与两种常用的多轴非比例加载疲劳寿命模型的预测结果对比可知,新的寿命预测模型对14种比例和非比例加载路径下304不锈钢材料的寿命预测与试验吻合更好,预测结果基本位于2倍分散带以内.
Based on the analysis of several commonly used definitions of non-proportional degrees of multi-axial fatigue, a non-proportional definition method is proposed, and then the strain applied in non-proportional multi-axial fatigue design criteria in American Society of Mechanical Engineers (ASME) Parameter as a basic damage parameter, a new multi-axis fatigue life prediction model is developed. The results show that the proposed non-proportional definition can describe a non-proportional and non-periodic loading path with any known contour, 2 and the two commonly used multi-axial non-proportional loading fatigue life model prediction results show that the new life prediction model of 14 kinds of proportional and non-proportional loading path of 304 stainless steel life prediction and test better agreement, the basic prediction results Within 2 times the dispersion zone.