Low-velocity impact damage initiation in graphite/epoxy/Nomex honeycomb-sandwich plates

摘要: Abstract Low-velocity impact and static indentation tests on sandwich plates composed of 4- to 48-ply graphite/epoxy cross-ply laminate facesheets Nomex honeycomb cores have been performed characterize damage initiation as a function facesheet thickness loading rate. Force histories during low-velocity are measured by using an instrumented impactor integrated produce energy histories. Energy shown reveal initiation. Static show that is similar produced impact. The force at which initiates be lower for than tests, differences between equilibrium curves the two types discussed. difference greater with thicker facesheets. This may indicate limitation applicability common assumption quasi-steady process.