Impulse saturation in metal plates under confined blasts

Large inelastic response of polyurea-coated steel plates to confined blast loading

“…Tables 2 and 3 list the air properties, EOS properties and the detonation parameters. The steel plate and polyurea coating were discretised using four-node shell elements [2][3][4] and eightnode solid brick elements [23,24,26], respectively. The interface between plate and coating have matching meshes.…”

“…The reason for this is that membrane action can strengthen the structure to a point where the blast load fails to induce further additional inelastic deformation. This is known as an impulse saturation phenomenon [36] -its importance to the mode I response of monolithic plates to confined blast loading was recently highlighted by Yuan et al [4]. The time taken for the central plate deflection to reach its maximum value, referred to as the saturation time t I Sat , is given by…”

“…Thin-walled structural members are used in a significant number of structural applications: aircraft, storage tanks, bulkheads in ships and etc. Their survivability -defined as the ability to retain service functionality in the face of threats -to extreme load cases have received increased attention lately, such as the confined blast performance of thin metallic plates [1][2][3][4]. The intensity of a confined blast is often amplified [5] through multiple shock wave reverberations, leading to prolonged loading duration, caused by the effects of confinement [6]; consequently, more severe structural damage, compared to its free-air counterpart (or external blasts) of equal charge mass, is a natural concomitant of the confinement effect [7].…”

Dynamic response and failure behaviour of thermoplastic fibre–metal​ laminates subjected to confined blast load

“…More complex shock wave superpositions and persistent quasi-static pressures affect the response of the structure. Furthermore, there is a saturation response to the problem of confined explosions [32][33][34][35]. This means that not all impulse loads contribute to the deformation of the structure.…”