氧化锆颗粒系统的动力学体积响应的模拟研究

Simulation on the Spectrum of Dynamical Volume Responses of Zirconia Granular System

数值研究了垂直脉冲激励下单分散球形氧化锆颗粒体系的动力学体积响应谱,分析了激励振幅对颗粒体系弛豫过程和体积响应谱的影响。结果发现:1在经历一系列低于临界振幅Γ*的垂直脉冲激励激励后,颗粒系统最终达到一个新的稳态;且达到新稳态所需的弛豫时间τ_0和最终堆积密度ρ_f都取决于外部激励的振幅;2由数值方法得到的氧化锆颗粒系统的体积响应因子的实部存在一个子峰,虚部存在两个子峰,这两个子峰可能代表了颗粒系统在外部激励条件下不同状态的转变点。

The LIGGGHTS software is used to calculate the dynamic volume response spectrum of the monodisperse spherical zirconia system excited by the vertical pulse,the effect of the excitation amplitude on the relaxation process of the granular system and the volume of the response spectrum are analyzed. The following conclusions are made： 1and if the granular system experiences a pulse excitation whose amplitude is be lower than the critical amplitude Γ＊,with the increment of the number of taps,the system goes gradually to a new steady state,the relaxation time τ_0 and final accumulation density ρ_f needed to reach the new steady state are controlled by the amplitude of excitation. 2 there is a sub peak of the real part and two sub peaks of imaginary part of the volume of the zirconia particles system,The two peaks may represent the transition point of the particle system under the external excitation.