物理学报2016，Vol.65Issue(12)：124501-1-124501-10,10.DOI:10.7498/aps.65.124501
类固态颗粒物质的剪切弹性行为测量∗
Measurement of shear elasticity of granular solid
摘要
Abstract
Using a direct shear-box capable of very low shearing rate, we measure the force-displacement curve of cyclic, large-amplitude shear, and also the total plastic displacement residual after each cycle, for samples of glass beads. As the shear rate decreases, we observe a transition from normal, elastoplastic behavior to pure elastic behavior, with reducing residual, or total plastic, displacement after each cycle. Remarkably, this transition is also observed for large amplitude of the cyclic shear, up to 90%of the failure value. The force-displacement relation is necessarily rate-dependent during this transition. These experimental results demonstrate that granular solids may respond in a purely elastic manner, both for low amplitude force oscillations of high frequencies (such as sound) and for large amplitude ones of low frequencies, implying that the granular matter has a purely elastic regime, in which the theory of elasticity holds fully true. This regime has been overlooked in the literature, probably because its deformation rate is nearly two orders of magnitude lower than those typically used. Theoretically, the present measurements support granular solid hydrodynamics, or the fact that strong deviation from elastoplastic dynamics and rate independence take place in the low frequency limit, with a rate-dependent transition to the classic theory of elasticity.关键词
颗粒固体/率相关/弹性/塑性Key words
granular solid/rate-dependence/elasticity/plasticity引用本文复制引用
颜细平,彭政,何菲菲,蒋亦民..类固态颗粒物质的剪切弹性行为测量∗[J].物理学报,2016,65(12):124501-1-124501-10,10.基金项目
国家自然科学基金(批准号:10904175,11274390)资助的课题.@@@@* Project supported by the National Natural Science Foundation of China (Grant Nos.10904175,11274390) （批准号:10904175,11274390）
