@article{oai:iwate-u.repo.nii.ac.jp:00009887,
 author = {ONODERA, Hideki and TAKAYAMA, Kazuyoshi},
 issue = {2},
 journal = {JSME international journal. Ser. B, Fluids and thermal engineering},
 month = {Jan},
 note = {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 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 pressures larger than P_c, Z_i/Z_t decreases asymptotically to a small finite value.},
 pages = {268--274},
 title = {Shock Wave Structure in Polyurethane Foam},
 volume = {37-B},
 year = {1994}
}