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实验表明:蠕变过程中的内耗兼有Maxwell二参量模型的性质和滞弹性三参量模型的性质。 本文提出一个用以描述蠕变过程中内耗的四参量模型。由此模型推导出的内耗表达式为 Q~(-1)=1/(ωτ_1)+△(ωτ_2)/(1+ω~2τ_2~2),式中ω为测量圆频率,τ_1和τ_2分别为粘弹性内耗和滞弹性内耗的弛豫时间,△为弛豫强度。 这个内耗表达式可以满意地说明蠕变过程中内耗随时间的变化,以及内耗对蠕变速率、实验温度和测量频率的依赖关系。 文中还从微观上分析了四参量模型中各元件的物理本质。
Experiments show that the internal friction in the process of creep has both the nature of the Maxwell two-parameter model and the nature of the three-parameter model of the anelasticity. This paper presents a four-parameter model to describe the internal friction during creep. The internal friction expression derived from this model is Q ~ (-1) = 1 / (ωτ_1) + Δ (ωτ_2) / (1 + ω ~ 2τ_2 ~ 2) where ω is the measured circular frequency, τ_1 and τ_2 For the viscoelastic internal friction and anelastic relaxation time of internal friction, △ is the relaxation strength. This internal friction expression satisfactorily describes the internal friction variation over time as well as the dependence of internal friction on creep rate, experimental temperature and measurement frequency. The article also analyzes the physical essence of each component in the four-parameter model from the microscopic point of view.