Meso-scopic deformation in brittle granular materials

18th APS-SCCM; 24th AIRAPT

Neal, William D.^1,2 ; Appleby-Thomas, Gareth J.^3 ; Collins, Gareth S.^2

Institute of Shock Physics, Imperial College London, SW7 2AZ, United Kingdom^1

Applied Modelling and Computational Group, Imperial College London, SW7 2AZ, United Kingdom^2

Dynamic Response Group, Cranfield University, Shrivenham, United Kingdom^3

关键词: Dynamic compaction;    Dynamic experiment;    Fracture behaviour;    Glass microspheres;    Particle fracture;    Particulate systems;    Qualitative differences;    Quasi-static regime;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112047/pdf
DOI  :  10.1088/1742-6596/500/11/112047

来源: IOP

【 摘 要 】

Compaction is the process of removing void-space from a porous material. In brittle particulate systems, the majority of densification is caused by particle fracture. This preliminary study aimed to investigate the differences in fracture behaviour between quasi-statically and shock loaded glass-microsphere beds. Macro-scale quasi-static (20 μm s-1) and dynamic compaction curves were measured that show subtle qualitative differences in stress-density space. Samples were recovered from a quasi-static and dynamic experiment at a similar order of stress. Differences in fracture behaviour were observed that may explain the differences in crush curves. Results suggest that the primary total-fracture process occurs relatively instantaneously at low stresses in the quasi-static regime. The sphere fracture process is slow relative to the stress-wave therefore causing a different fracture pattern in the shock regime.