Projectile Impact Behaviour of Sandwich Material with Nomex Honeycomb and Metallic Skins

Abstract

Projectile impact test is carried out to investigate damage and failure behaviour under different impact velocity from 90m/s to 160m/s. Strain-time history curve on the control points are analysed in this paper. Sandwich beam dynamic response and the degree of structural degeneration under impact loading both depends on the thickness of metallic skins. The projectile impact test demonstrate difference damage characteristics between the sandwich beams with different thickness skins. The peak stress value are estimated approximately to determine the skin deformation and sandwich beam global damage degree.

Compression after impact test (CAI) on NOMEX™ honeycomb sandwich panels with thin aluminum skins

“…Instead of the CAI test, to assess the residual strength of the impacted panels, a 4 points bending test was exploited in [16] to evaluate panels having aramid paper fold-cores and carbon-fiber reinforced plastic (CFRP) skins. Impact on sandwich panels with a Nomex ™ honeycomb core and aluminum skins was studied in [17] and by the same authors of the present research in [18] but in both cases the impact velocity is much higher than in the current research (160-800 m/s vs. 7 m/s).…”

“…This dimension is large enough to fully include the impact damage area. According with the definition of [17], the CAI test have been always performed keeping the honeycomb L direction always parallel with the compressive load. Impacted specimens used for the drop test (Section 2.1) have been cut to the required dimension.…”

Impact resistance of Nomex honeycomb sandwich structures with thin fibre reinforced polymer facesheets

“…Extensive research work was conducted on the mechanical response of the Nomex honeycomb sandwich structures under impact loading [6][7][8][9][10][11]. However, limited research work was undertaken on the perforation failure of honeycomb sandwich structures and most of these studies were focused on normal impact, i.e.…”