Angular grain fragmentation with DEM modeling: application to fault gouge shearing [0.03%]
基于DEM的碎裂角粒结构及其在断层磨粉带中的应用研究
Nathalie Casas,Guilhem Mollon,Marco Maria Scuderi
Nathalie Casas
Understanding grain fragmentation in fault gouge is essential for capturing the mechanical behavior and evolution of fault zones under shear. In this study, we present a 2D Discrete Element Method (2D-DEM) framework that simulates comminuti...
Numerical investigation of crack propagation regimes in snow fracture experiments [0.03%]
雪断裂实验中裂纹扩展模式的数值研究
Grégoire Bobillier,Bastian Bergfeld,Jürg Dual et al.
Grégoire Bobillier et al.
A snow slab avalanche releases after failure initiation and crack propagation in a highly porous weak snow layer buried below a cohesive slab. While our knowledge of crack propagation during avalanche formation has greatly improved over the...
Efficient DEM simulations of railway ballast using simple particle shapes [0.03%]
采用简单颗粒形状的铁路道砟DEM仿真研究
Bettina Suhr,Klaus Six
Bettina Suhr
For complex shaped materials, computational efficiency and accuracy of DEM models are usually opposing requirements. In the literature, DEM models of railway ballast often use very complex and computationally demanding particle shapes in co...
The concept of the mobilized domain: how it can explain and predict the forces exerted by a cohesive granular avalanche on an obstacle [0.03%]
动员域的概念：它如何解释和预测堆积颗粒流施加在障碍物上的力
M L Kyburz,B Sovilla,J Gaume et al.
M L Kyburz et al.
Abstract: The calculation of the impact pressure on obstacles in granular flows is a fundamental issue of practical relevance, e.g. for snow avalanches impacting obstacles. Previous research shows that the load on the obs...
DEM modelling of railway ballast using the Conical Damage Model: a comprehensive parametrisation strategy [0.03%]
基于圆锥损伤模型的铁路道砟材料离心机试验及本构模型参数标定研究
Bettina Suhr,William A Skipper,Roger Lewis et al.
Bettina Suhr et al.
Despite ongoing research, the parametrisation of a DEM model is a challenging task, as it depends strongly on the particle shape representation used, particle-particle contact law and the simulated applications: for railway ballast e.g. lab...
Microstructural differences between naturally-deposited and laboratory beach sands [0.03%]
天然沉积砂和实验室滩砂的微观结构差异研究
Amy Ferrick,Vanshan Wright,Michael Manga et al.
Amy Ferrick et al.
The orientation of, and contacts between, grains of sand reflect the processes that deposit the sands. Grain orientation and contact geometry also influence mechanical properties. Quantifying and understanding sand microstructure thus provi...
Simple particle shapes for DEM simulations of railway ballast: influence of shape descriptors on packing behaviour [0.03%]
用于铁路道砟DEM模拟的简单粒子形状：形状描述符对堆积行为的影响
Bettina Suhr,Klaus Six
Bettina Suhr
Abstract: In any DEM simulation, the chosen particle shape will greatly influence the simulated material behaviour. For a specific material, e.g. railway ballast, it remains an open question how to model the particle shap...
I Soriano,E Ibraim,E Andò et al.
I Soriano et al.
The mechanical behaviour of fibre-reinforced sands is primarily governed by the three-dimensional fibre architecture within the sand matrix. In laboratory, the normal procedures for sample preparation of fibre-sand mixtures generally produc...
Linking attractive interactions and confinement to the rheological response of suspended particles close to jamming [0.03%]
吸引力与受限状态之间关系决定颗粒临界堆积时的流变响应
Michael A Jones,Christopher Ness
Michael A Jones
We study the response to simple shear start-up of an overdamped, athermal assembly of particles with tuneable attractive interactions. We focus on volume fractions close to the jamming point, where such systems can become disordered elastop...
Transparent experiments: releasing data from mechanical tests on three dimensional hydrogel sphere packings [0.03%]
透明实验：关于三维水凝胶球元释放数据的机械试验
Jonathan Barés,Nicolas Brodu,Hu Zheng et al.
Jonathan Barés et al.
We describe here experiments on the mechanics of hydrogel particle packings from the Behringer lab, performed between 2012 and 2015. These experiments quantify the evolution of all contact forces inside soft particle packings exposed to com...