| Autor: |
William Proud, William Neal, David J. Chapman |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| DOI: |
10.1063/1.3686568 |
| Popis: |
Shock compaction studies of sand, and other brittle granular materials, have produced wave profiles that show an unsteady precursor-wave followed by a steady shock-wave. Two theories exist regarding the meso-mechanical deformation that occurs within this precursor wave: inter-particle rearrangement and particle fracture. Plate impact experiments were conducted on beds of quasi-mono-disperse soda-lime glass microspheres. The thickness of the granular bed was varied to measure evolution of the precursor waves. Granular beds comprising smaller particles produce higher magnitude precursor waves which indicates a higher bulk material strength. This theory of increasing strength with decreasing scale agrees with other studies. The precursor waves within beds of 63 μm microspheres appear to reach a steady state within the run distance of the beds used in this investigation but thicker beds of 200 and 500 μm particles are potentially required to observe a steady state precursor wave. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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