JSME International Journal Series B Fluids and Thermal Engineering
Online ISSN : 1347-5371
Print ISSN : 1340-8054
ISSN-L : 1340-8054
Shock Wave Structure in Polyurethane Foam
Hideki OnoderaKazuyoshi Takayama
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1994 Volume 37 Issue 2 Pages 268-274

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Abstract

Shock wave propagation in polyurethane (PU(R)) foam was experimentally studied. The experiment was conducted in a shock tube by measuring pressure along the PU(R) foam in a shock tube, by means of holographic interferometry and streak camera recording. It was found that the stress-strain curve of PU(R) has an inflection point. When the pressure behind the incident shock wave was below the inflection-point pressure Pc, the wave impedance ratio of the incident shock wave and transmitted pressure wave Zi/Zt increased sharply. This indicates that only a small amount of energy is transmitted into the foam if the pressure is below Pc. For pressures larger than Pc, Zi/Zt decreases asymptotically to a small finite value.

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© The Japan Society of Mechanical Engineers
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