Shock Wave Structure in Polyurethane Foam.

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  • 軟多孔質フォーム内の衝撃波伝ぱ
  • ナンタコウシツ フォームナイ ノ ショウゲキハ デンパ

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An experimental study was made of shock wave propagation in polyurethane (PUR) foam. The experiment was conducted in a shock tube by measuring pressure along the PUR foam by means of holographic interferometry and streak camera recording. It was found that the stress-strain curve of PUR have 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 pressure larger than Pc, Zi, /Zt decreases asymptotically to a small finite value.

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