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通过比较热机械疲劳寿命的３种不同唯象描述方法，讨论了相位差对疲劳寿命的影响，提出对疲劳寿命的唯象描述应采用总应变范围Δεｔ或非弹性应变范围Δεｉｎ，才符合工况模拟试验和疲劳寿命预测的基本条件。
By comparing the thermodynamic fatigue life of three different phenomenological description methods to discuss the phase difference on the fatigue life, proposed fatigue life phenomenal description should be used in the total strain range Δεt or inelastic strain range Δεin, only in line with the working conditions Simulation tests and fatigue life prediction of the basic conditions.