| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Research Abstract |
Pressure attenuation effect of blast wave through porous layers and high visco-elastic material are one of the important re-search topics related to safety assessment and prevention from explosion hazards. Part of projects regarding shock wave and blast wave motions in complex multi-phase media investigated the attenuation of strong shock pressure in sand layer, polyurethane foam and glass beads. Peak overpressures in complex particle layer decrease quickly than that in air, as the blast wave is degenerated into compression waves due to its interaction with three-dimensional porosity distribution. Pressure attenuation caused in present complex media are about 90% of the peak overpressure value in air. In the case of interaction between underwater shock wave and high visco-elastic fluid, the diameter of gas bubble and contractile cycle depend on the fluid kinetic viscosity and strength of underwater shock pressure. Peak overpressure in silicon oils decrease to about 40～54% of the incident peak overpressure in water. Impulse of silicon oils increase in accord with the kinetic viscosity ratio.
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