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Verification of DEM for Granular Materials by Tests Using Aluminium Rods

通过铝棒测试验证颗粒材料的 DEM

基本信息

批准号：
02650343
负责人：
MATSUOKA Hajime
金额：
$ 1.41万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650343/
关键词：
Granular materials Distinct element method (DEM)Two-dimensional model Stree-strain relation

项目摘要

The DEM is a method for simulating the behaviour of a discontinuous body by modelling the mechanical properties at contact points between disks or blocks. It can analyze the behaviour of granular materials like sands and discontinuous rocks. The parameters between particles such as elastic constants, coefficients of viscosity and coefficients of friction, and the particle size are usually determined so as to obtain appropriate analytical results, The research results are summarized as follows :1. The elastic constants between aluminium rods were determined as accurately as possible by the contact theory between circular rods. A method for measuring frictional coefficients between rods under the real behaviour of rods was proposed.2. The simulation results by DEM using the accurate parameters was compared with the results of direct shear box tests on the regular packing of aluminium rods with equal diameter. It became clear from the comparison that the DEM can simulate the behaviour of aluminium rods under direct shearing exactly. A similar comparison will be made for the irregular packing of aluminium rods with different diameter.3. The model tests on EPS, a very light fill material, were carried out in the laboratory, and were compared with the analytical results by DEM and FEM. Based on the comparison, DEM is more suitable than FEM for explaining the discontinuous behaviour of EPS.

DEM是一种通过模拟圆盘或块体之间接触点的力学特性来模拟不连续物体行为的方法。它可以分析砂子和不连续岩石等颗粒状材料的行为。为了得到合理的分析结果，通常需要确定颗粒间的弹性常数、粘滞系数、摩擦系数以及颗粒尺寸等参数，本文的研究成果总结如下：1.根据圆棒间接触理论，尽可能准确地确定了铝棒间的弹性常数。提出了一种在杆件实际工作状态下测量杆件间摩擦系数的方法。将精确参数的离散元模拟结果与等直径铝棒规则堆积的直剪箱试验结果进行对比。通过比较可知，离散元方法能较好地模拟铝棒在直接剪切作用下的行为。对于不同直径的铝棒的不规则包装，也会进行类似的比较。对超轻质填充材料EPS进行了室内模型试验，并与DEM和有限元分析结果进行了比较。通过比较，DEM比有限元更适合于解释EPS的不连续行为。