The results of penetration and perforation tests carried out on composite sandwich panels using hemispherical-ended and conical-nosed indenters/projectiles under quasi-static, drop-weight and ballistic impact conditions with impact velocities up to 305m/s are summarized. Load-displacement characteristics under quasi-static loading are presented. Ballistic limits and perforation energies are determined and a classification of the responses based on the panel thickness to projectile diameter ratio is deduced from the test data. A general empirical formula that predicts the dynamic perforation energies for FRP laminates and sandwich panels with such laminates as the skins and with foam cores loaded by hemispherical-ended projectile is derived. It is shown that the empirical equation correlates well with available experimental data. It is also shown that, to a first approximation, the formula obtained for hemispherical-ended projectiles is also applicable to conical-nosed projectiles.
|Number of pages||7|
|Journal||American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP|
|Publication status||Published - 1 Dec 1997|