Theoretical Research On Impact Response Of Porous Materials With Initial Ultra-low Densities

High velocity impact response of porous materials with initial ultra-low densities are discussed allsidedly in this article, including shock Hugoniot, shock temperature and bulk velocity at high pressure and so on. Potential plasma oscillation for porous metals at high shock temperature is also involved simply. An extended Hugoniot equation of state (EOS) including thermoelectronic contribution is obtained in an EQS frame in which pressure is as an independent variable. This EOS has the capability of predicting the shock Hugoniots of porous materials with initial theoretical densities larger than 5% perfectly. The rebuilding of the J. M. Walsh method for shock temperature is also accomplished to calculate the shock temperatures for special matters, for example, porous materials which have their Hugoniots dilated. Besides, a new calculation method for bulk sound velocities of porous materials with ultra-low densities is derived and the influence of plasma oscillations in porous metals to its EQS is discussed. Progress in these fields is important theoretically for experiments on porous materials to investigate the thermodynamic properties of matters in the so- called Blind Region, with pressure P 20 - 3OGPa, density p