Effective Impulse for Fully Clamped Rectangular Plates Under Internal Blast Loading

Under internal blast loading, the response of a beam or plate is highly correlated with the phenomenon of saturated impulse, which governs the deflection of the structure. This paper aims to investigate the phenomenon of saturated impulse for fully clamped rectangular plates subjected to internal blast loading. Based on the rigid, perfectly plastic assumption, the relationship between saturation duration and saturation deflection is derived. Influences of the peak shock wave, the duration of shock wave and the peak quasi-static pressure loading on saturation duration and saturation deflection are discussed. It is found that there is a critical duration for the internal blast impulse to reach saturation, and beyond this duration, the deflection of plate will no longer increase as the loading increases further. The saturation deflection and saturation duration both exhibit regular variation patterns with the changes of the dimensionless peak shock wave, the duration of shock wave and the peak quasi-static pressure loading.