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为了使总应变寿命方程能够在较大寿命范围内具有理想的预测精度且其参数物理意义明确,基于总应变寿命方程中疲劳强度系数与疲劳延性系数的物理意义,建立了总应变寿命方程参数与单调拉伸强度极限和断面收缩率之间的关系,并结合TC4,GH4169及GH901合金的单调拉伸及疲劳试验数据,对其各自的总应变寿命方程参数进行了拟合,进而开展了疲劳寿命预测.结果表明:采用该方法确定的总应变寿命方程参数具有明确的物理意义,且对TC4,GH4169及GH901合金的疲劳寿命预测结果较为理想,其分散带基本在2倍以内.
In order to make the total strain life equation have an ideal prediction accuracy over a large lifetime and the physical meaning of the parameters is clear, based on the physical meaning of the fatigue strength coefficient and the fatigue ductility coefficient in the total strain life equation, the total strain life equation parameters and The relationship between the monotonous tensile strength limit and the reduction of area, and the monotonic tension and fatigue test data of TC4, GH4169 and GH901 alloy were fitted to their respective total strain life equation parameters, and then the fatigue life The results show that the parameters of the total strain life equation determined by this method have clear physical meaning and the predicted fatigue life of TC4, GH4169 and GH901 alloys is ideal, and the dispersion zone is basically within 2 times.