Study on the dynamic response of combined honeycomb structure under blast loading: Fid-Bau Portal

Study on the dynamic response of combined honeycomb structure under blast loading

Meng, Yi / Lin, Yuliang / Zhang, Yuwu / Li, Xiangcheng

Abstract Combined aluminium honeycomb has been considered a promising structure in the protection field due to its excellent energy absorption capacity. To improve its application, it is crucial to understand the mechanical behaviour of combined honeycomb under explosion. Here, we examined the compression characteristics of combined honeycomb structure under explosion experimentally and through simulations. The effect of parameters, i.e. explosive scaled distance and slider thickness on compression depth and normalized compression stress were examined. Results showed that the energy absorption and compression strain decreased with the slider thickness and scaled distance. The normalized compression stress of the cutting stage remained unchanged and not sensitive to the slider thickness and scaled distance. Compared with other conventional honeycomb structures, the combined honeycomb structure exhibited promising application prospects in linear energy absorption structures. In addition, a semi-empirical formula was proposed to calculate the compression depth of two stack-up combined honeycomb, in which structural parameters and mechanics properties of the base material were considered. The predicted results were in good agreement with the experimental results.

Highlights • For Al5052 combined honeycomb, constant plateau stress is obtained for the whole range of loading parameters. • The progressive plastic folding of cell walls in the cutting process is observed in blast tests. • A semi-empirical formula is proposed to calculate the cutting depth of two stack-up combined honeycomb.