An experimental study of high-velocity impact on elastic–plastic crushable polyurethane foams

摘要: Abstract The mechanical behavior of elastic–plastic polyurethane foams was studied experimentally under high-velocity local impact loading in normal and oblique directions, particular, the energy absorption situation damage zone were investigated. In order to obtain properties, at first quasi-static compressive global performed on foams. Then, several samples rigid with different thicknesses (between 10 80 mm) densities 40 320 kg/m3) prepared subjected (with projectile velocity range between 30 140 m/s). results showed that foam density ( kg / m 3 ) thickness (mm) has highest them also increasing increases area rear side foam. Furthermore, it found consists two cylindrical frustum-like zones. It shown absorbed dependent both thickness; therefore, attempted statistically formulize relationship one hand other based experimental data. effect nose including five shapes such as flat-ended, hemi-spherical, semi-elliptical, right-conical sharp-conical investigated penetration depth into target. have revealed decreasing curvature radius cross-section; hence, too weak against sharp noses. On hand, performing impacts angle changes shape from ellipsoid-like triangle-shape.