Experimental and Numerical Study of Submillimeter-Sized Hypervelocity Impacts on Honeycomb Sandwich Structures

摘要: Abstract This paper deals with hypervelocity impacts of submillimer-sized debris on honeycomb sandwich panels. These debris, which are mostly present within the low Earth orbit, indeed represent a real threat for spacecrafts and satellites. In fact, large enough to be tracked, pre-determined avoidance manoeuvre is usually conducted prevent any damage. Submillimer-sized however, too small identified therefore spatial structures must protected against such threat. Honeycomb structural panels whipple shields have been used as primary shielding orbital impact. The protection capability estimated using Ballistic Limit Equations (BLE). data built from experimental tests shield transposed case Whipple shield, cloud generated at impact bumper sheet expands until reaching rear wall. BLE only depends materials properties, geometry, angle incidence velocity. For panels, partially channelled cells, thus limiting its radial expansion. channelling effect function cell geometry. presented by Centre d’Etudes de Gramat (CEG) in 2008 has introduced order take into consideration effect. study proposes extend results CEG. main approach consider relative dimensions between projectile diameter geometry evaluate perforation risks impacts. process panel first modelled commercial hydrocode LS-Dyna hybrid Lagrange Smooth Particle Hydrodynamics (SPH) solvers. numerical model validated through several experiments carried out Thiot Ingenierie Shock Physics Laboratory velocities up 9.3 km/s. then define ballistic curve defines critical specific subjected finally compared ones obtained CEG leading an updated estimation