Study On The Buffering And Energy-absorbed Property Of Combined Hexagonal Aluminum Honeycomb

Aluminum honeycomb,as a structural material,is a good energy-absorption material with low density,relatively small stress strength,large crushing strain and strong ability in energy absorption.It is widely used as energy absorbers and protective components in various industries such as aerospace,automotive and military defense industry.According to the existing literatures,many studies are carried out which mainly focused on the following aspects: the out-of-plane and in-plane crushing behavior of single aluminum honeycombs;mechanical behavior of aluminum honeycomb sandwich panels.In this work,two types of honeycombs with different sizes of cells are applied in the study.We focus on the out-of-plane inserting and crushing behavior of combined aluminum honeycomb structures,in which the honeycomb samples are stacked without lining boards and can insert into each other.By quasi-static compression and dynamic compression,the crushing and energy-absorbed property is analyzed in detail.Compared with single aluminum honeycomb and series aluminum honeycomb,combined aluminum honeycomb is designed with different thickness to study the stress response and difference between buffering and energy absorption.By traditional Split Hopkinson Pressure Bar(SHPB),inserting stress response of combined aluminum honeycomb is discussed in dynamic compacting condition.By modified SHPB technology,the whole dynamic cushion response of combined aluminum honeycomb is investigated in low speed loading condition.In the experiment,force is measured by PVDF sensor and displacement is measured by a laser in situ measurement.In addition,the inserting process of combined honeycombs is simulated by finite element model we also compare the process with the experiment.As a result,combined aluminum hexagonal honeycomb has excellent properties of buffer and energy-absortion.Different with the principle of single honeycomb and series honeycomb,combined honeycomb has a unique response,inserting interaction.The study of combined honeycomb provides a new method to design the stress response of buffer energy-absorbing structure and a new idea for the energy-absorbing design of aluminum honeycomb,which make the structure diversified and devisable.