水滴超高速撞击Whipple 防护结构的毁伤特性

In this paper, an experimental study on spherical water droplets with diameters of 3.7 and 6.4 mm at hypervelocity impacting typical Whipple protection structure (consisting of a buffer plate and a effect plate) was carried out at room temperature, and the damage characteristics of the double-layer aluminum plate created by different diameter spherical water droplet projectile were obtained. The finite element method-smoothed particle hydrodynamics (FEM-SPH) adaptive method in LS-DYNA software was used to study the damage characteristics of the Whipple protective structure impacted by water droplets with diameters varing in the range of 3−7 mm at different velocities. The influences of water droplet diameter, impact velocity, target plate thickness and other factors on the damage charateristics were analyzed. An empirical formula of dimensionless perforation diameter of water droplet impacting aluminum plate was obtained at hypervelocity in the range of 2−8 km/s. The minimum velocities for different water droplet diameters varing in the range of 3−7 mm required for the Whipple protection structure was obtained.