軟多孔質フォーム内の衝撃波伝ぱ

小野寺 英輝, 高山 和喜

doi:10.1299/kikaib.58.666

軟多孔質フォーム内の衝撃波伝ぱ

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書誌事項

タイトル別名

Shock Wave Structure in Polyurethane Foam.
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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説明

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 P_C, the wave impedance ratio of the incident shock wave and transmitted pressure wave Z_i./Z_t increased sharply. This indicates that only a small amount of energy is transmitted into the foam if the pressure is below P_c. For pressure larger than P_c, Z_i, /Z_t decreases asymptotically to a small finite value.