土体产生应力松弛的原因就是因为应变分为粘性应变和弹性应变，在其总应变不变的情况下，粘性应变随时间的增加而变大，故弹性应变则相应的减少，这就造成了应力的减小。
将所得变化规律与等效粘性阻尼理论相结合，给出了一种依赖于应变和频率的非线性阻尼本构关系式。
Based on above fitted relation and equivalent viscous damping theory, a nonlinear constitutive equation of damping alloy depending on strain amplitude and frequency is put forward.
研究认为温度与应变率影响的变形机制与位错运动过程的粘性效应有关。
The results indicate that the deformation mechanic under the action of temperature and strain rate is related to the viscosity effect in process of dislocation motions.
文中假定，弹性阶段的粘性效应可以略去，仅在塑性应变中粘性才起作用。
It is assumed that the viscosity effect can be neglected for elasticity strain, and only for plasticity strain, the viscosity is significant.
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