| Autor: |
Danyal Magnus, Mansoor Khan, David R. Sory, William G. Proud, James D. Lee |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
SHOCK COMPRESSION OF CONDENSED MATTER - 2019: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. |
| ISSN: |
0094-243X |
| DOI: |
10.1063/12.0001017 |
| Popis: |
Primary blast injury mitigation remains a priority of the explosion protection community. The blast mitigation properties of polymer and hydrogel materials in response to shock tube loading was investigated. Sample materials included homogeneous and cellular variants of polyurethane and agarose. Compressive high-rate material characterisation performed on these materials at 1,300 s−1 strain rate using a high-sensitivity Split-Hopkinson Pressure Bar showed that the addition of hollow particulate to the homogeneous matrix of polymer or hydrogel effectively modified the stress-strain characteristics of the material for energy absorbing applications. To assess blast mitigation performance, samples were manufactured at shock tube scale with a 60 mm diameter and loaded with either a rigid or intermediate strength (gelatine) rear boundary condition in a closed system. Analysis of peak pressure mitigation showed that elastically deforming materials enhanced the peak pressure delivered to the protected structure by 10-15%, while materials undergoing dynamic plastic processes, as for brittle hydrogels, mitigated the peak pressure by 20-25%. The presence of a rear boundary air gap between the armour material and protected structure was found to influence the mitigation performance, with peak pressure enhancement for polymer samples due to acceleration of the mass against the rear surface. Conversely, hydrogels exhibited up to 20% greater mitigation at the maximal air gap distance of 30 mm due to increased fracture and cell buckling. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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