Nonlinear mesoscopic materials exhibit anomalous elastic nonlinearity in which fast and slow dynamics effects are mixed up. The former is an instantaneous nonlinear phenomenon due to the explicit strain dependence of velocity and damping. Slow dynamics is a non-equilibrium effect, governed by the dependence of the linear modulus and Q-factor on the dynamic strain level: when excited at constant strain, the sample properties vary in time (over minutes or more) until they reach a new equilibrium state. When excitation is removed, again slowly in time, the system recovers its original viscoelastic properties. The goal of this contribution is to show how slow dynamics might affect fast dynamics measurements and thus point out that care should be given to all time scales of the experiment, e.g. lag time between amplitude change and acquisition, duration of the acquisition and relaxation time between successive measurements.

非线性介观材料表现出异常的弹性非线性，其中快动力学效应和慢动力学效应混合在一起。前者是瞬时非线性现象，这归因于速度和阻尼的明显应变依赖性。慢速动力学是一种非平衡效应，受线性模量和Q因子对动态应变水平的依赖性控制：以恒定应变激发时，样品特性会随时间变化（超过几分钟或更长），直到达到新的平衡状态。消除激励后，系统又会慢慢恢复，从而恢复其原始的粘弹性。此贡献的目的是说明慢速动态如何影响快速动态测量，并因此指出应注意实验的所有时间范围，例如，振幅变化和采集之间的滞后时间，