| 欧阳鸿武*,雷刚,唐昕,孟力平.循环压制下圆筒内硬球颗粒物性演化特征[J].实验力学,2020,35(5):867~876 |
| 循环压制下圆筒内硬球颗粒物性演化特征 |
| Properties evolution characteristics of cylinder confined hard spheres under cyclic compression |
| 投稿时间：2019-05-14 修订日期：2019-06-23 |
| DOI：10.7520/1001-4888-19-084 |
| 中文关键词: 颗粒介质 循环压制 拓展Janssen模型 堆积密度 弹性模量 |
| 英文关键词:granular medium cyclic compression modified Janssen model packing density elastic modulus |
| 基金项目:国家自然科学基金资助项目(51475475) |
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| 中文摘要: |
| 为探明颗粒介质在循环压制下的变形行为和力学响应，采用拓展Janssen模型连续介质理论和循环压制试验对圆筒内硬球颗粒介质的物性演化特征开展研究。颗粒介质受轴向循环压制变形过程中伴随着固-液转变，有利于提高密度分布和力网结构的均匀性。堆积密度和弹性模量E的演化与循环压制次数n相关：(n)=0+[(∞)-0]×(1-e-n/α)， E(n)=E0+A1×(1-e-n/β1)+A2×(1-e-n/β2)，其中E0+A1+A2=E(∞)。基于拓展Janssen模型计算方法与试验测量相结合，获取压制过程中颗粒介质的应力场、变形场分布情况，以及边界的摩擦状态和颗粒介质弹性模量的演化特征。颗粒介质在循环压制作用下力-位移的迟滞效应随n逐渐减弱，系统趋于力学平衡状态，力学响应表现为类弹性体特征。 |
| 英文摘要: |
| To study the deformation behavior and mechanical response of spheres in cylindrically-confined granular medium under cyclic compression, the physical evolution characteristics of hard spheres in cylinder are investigated based on the continuum medium theory of modified Janssen model and cyclic compression experiments. It is found that the solid-to-fluid transition, accompanied by cyclic axial compression deformation, can improve the spatial uniformity of the packing density distribution and force network structure. The evolutions of the packing density and elastic modulus E are found as functions of the number of cycles n: (n)=0+[(∞)-0]×(1-e-n/α) and E(n)=E0+A1×(1-e-n/β1+A2-n/β2), where E0+A1+A2 |
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