Abstract
Honeycomb sandwich structure is widely used in aircrafts and ships to absorb impact energy. Damage caused by low-energy impact is difficult to investigate, but will significantly reduce the strength of the sandwich structure. This paper presented a systematical experimental study on the damage behavior of honeycomb sandwich structure under different configurations. Drop weight tests were carried out to investigate the effect of impact energy, core material and face plate structure on the dynamic response of sandwich plate. Delamination regions were obtained through ultrasonic scanning. Conclusions were made that the damage behavior of the face plate was similar with composite laminates while the energy absorption capacity was related to the parameters of the honeycomb core and the mismatch angle of the face plate.
Highlights
A sandwich structure consists of three parts: two stiff face plates and a light weighted core
The face plate was stacked by unidirectional composite laminates, while the core was composed by honeycomb structure made of Nomex
The face plates of the sandwich plate were stacked by T700/3234 unidirectional carbon/epoxy composite while the honeycomb core was made of Nomex
Summary
A sandwich structure consists of three parts: two stiff face plates and a light weighted core. The damage caused by a low-energy impact is difficult to obtained, but will significantly reduce the strength of the structure, especially the interface strength. It is important to summarize the damage regulation of sandwich structure under low-energy impact. The face plate was stacked by unidirectional composite laminates, while the core was composed by honeycomb structure made of Nomex. The delamination within face plate, the debonding between face plate and core, and the crush of honeycomb may seriously reduce the strength of the whole structure. The effect of impact energy, core material and face plate stacking sequence were investigated by three groups of tests. The damage regulation of sandwich structure was summarized and some future works were listed
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