关键词: Nomex蜂窝, 低速平头冲击, 精细模型, 斜冲击

Abstract: The anti-flat punch impact performance of Nomex honeycomb sandwich structure is studied on the ballistic characteristics under high-speed or high-energy impact, and it is mostly in the form of the punch perpendicular to the plate surface, rather than the common oblique impact. In order to study the low-speed flat-head impact resistance of the aluminum panel Nomex honeycomb structure, a detailed model of the Nomex honeycomb sandwich structure was established in ABAQUS. A hemispherical head low-velocity impact test platform was built for impact test. The accuracy of the simulation model was verified by comparing the impact force-time curve and punch velocity-time curve. The damage morphology, mechanical response and energy absorption of the structure under 0°, 15°, 30° and 45° flat head impact were discussed by simulation. The results show that as the impact angle increases during oblique impact, the maximum concave depth of the surface decreases, and the horizontal slip distance increases but the debonding area is the same. The impact angle increases from 0° to 45°, the contact time increases by 34.88%, and the peak contact force drops by 12.79%, and the honeycomb wicking can be reduced by 63.28%.

Key words: Nomex honeycomb, low speed flat head impact, detailed model, oblique impact