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为了研究沥青混合料在重复荷载作用下的疲劳特性并描述疲劳-蠕变损伤效应共同作用的过程,考虑沥青混合料具有的动态性质,从粘弹性损伤力学基本理论出发,基于应变等效假设,采用复数模量定义了损伤变量。通过分析沥青混合料在周期荷载作用下的损伤变化规律,运用疲劳-蠕变耦合损伤理论,建立了疲劳-蠕变损伤效应共同作用时的损伤演化方程,提出了体现温度及应力影响的损伤模型和疲劳寿命预测模型,并对损伤模型进行了分析。研究结果表明:构建的损伤模型满足热力学准则和物理条件;沥青混合料疲劳失效是由疲劳-蠕变损伤效应共同影响所致;利用提出的疲劳模型可以更好地预测不同温度和应力条件下的沥青混合料疲劳寿命。
In order to study the fatigue behavior of asphalt mixture under repeated loading and to describe the interaction between fatigue and creep damage effects, considering the dynamic properties of asphalt mixture, based on the basic theory of viscoelastic damage mechanics and based on the strain equivalent assumption, The complex variable defines the damage variable. By analyzing the change law of asphalt mixture damage under cyclic loading and using the theory of fatigue-creep coupling damage, the damage evolution equation under fatigue-creep damage effect is established, and the damage model that reflects the influence of temperature and stress is proposed And fatigue life prediction model, and analyzed the damage model. The results show that the damage model meets the thermodynamic criteria and physical conditions. The fatigue failure of asphalt mixture is caused by the fatigue-creep damage effect. By using the proposed fatigue model, the fatigue model can be better predicted under different temperature and stress conditions Asphalt mixture fatigue life