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基于不可逆热力学提出一个新的高周疲劳损伤力学模型,该模型考虑载荷频率对疲劳寿命的影响。模型中的参数H和c对于无频率效应的材料是常数,而对于有频率效应的材料则是与频率有关的函数。同时,讨论了不同应力比时模型的表达形式。利用AlZnMgCu1.5和AMg6N两种材料在不同频率下的疲劳实验数据验证提出的模型。结果表明,该模型能够准确预测材料在不同加载频率和应力比条件下的疲劳寿命。
A new high-cycle fatigue damage mechanics model based on irreversible thermodynamics is proposed. The model considers the effect of load frequency on fatigue life. The parameters H and c in the model are constant for materials with no frequency effect, and frequency dependent for materials with frequency effect. At the same time, the expressions of different stress ratio models are discussed. The proposed model was validated by fatigue experimental data of AlZnMgCu1.5 and AMg6N at different frequencies. The results show that the model can accurately predict the fatigue life of materials under different loading frequency and stress ratio.