The article developed new fatigue models based on unloading energy for molybdenum alloys. According to the relationship between unloading energy, strain amplitude and number of cycles in fatigue experiment of molybdenum alloys，a low cycle fatigue model is established, which has a simpler structure and certain universality, and a unified fatigue model based on unloading elastic strain energy density is established. The new unified fatigue model can predict fatigue life, and shows that the fatigue strength coefficient (σ_f^,) is related to fatigue energy coefficient (W_a), which provides a new idea for exploring the physical meaning of Basquin-Manson-Coffin model.

本文开发了基于卸载能量的钼合金新疲劳模型。根据钼合金疲劳试验中卸载能量、应变幅值和循环次数之间的关系，建立了结构更简单、具有一定通用性的低周疲劳模型，以及基于卸载弹性应变能密度的统一疲劳模型。成立。新的统一疲劳模型可以预测疲劳寿命，并表明疲劳强度系数（σ _f ^,）与疲劳能量系数（W _a）相关，为探索 Basquin-Manson-Coffin 模型的物理意义提供了新思路.