Research On Energy Absorption And Application Of Cylindrical Honeycomb

Honeycomb due to excellent mechanical properties,often used as vehicle energy absorbing device absorbing elements,However,the traditional two-dimensional honeycomb has the disadvantages of the forming process being complicated,the boundary effect being obvious,the secondary processing existing,and the shape of the rectangle being usually difficult to adapt to the cylindrical installation space.In this paper,we propose a new type of honeycomb structure-cylindrical honeycomb,and study its forming process,energy absorption characteristics,structure optimization and application for the structural characteristics of cylindrical honeycomb,which provides a theoretical basis for the application of cylindrical honeycomb experimental basis.Work as follows:(1)The structure characteristics of cylindrical honeycomb were analyzed,the forming process of cylindrical honeycomb was established,the relative density of cylindrical honeycomb was deduced,and four evaluation parameters of mechanical properties of cylindrical honeycomb were defined as initial peak force,compression ratio,average compressive force and specific energy absorption.(2)The axial quasi-static compression of cylindrical honeycomb and the energy absorption characteristics under impact load are simulated.First,the quasi-static compression simulation of the cylindrical honeycomb was carried out.The results show that the compressive force-displacement curve is divided into elastic deformation stage,stable compression stage and compaction stage.Secondly,using the single variable method to simulate the three influence parameters of the side length a,the corrugated thickness t1 and the thickness t2 of the corrugated sheet,it is found that as a decreases,t1 increases,the energy absorption performance increases significantly.The change of t2 has no significant effect on the energy absorption characteristics.When the increase of t1 and t2 are the same,the intensity increase of the former is about 8 times that of the latter.Then,the static compressive strength of the honeycomb is numerically fitted by MATLAB to obtain the empirical formula and establish the response surface function.Finally,the axial impact load of the cylindrical honeycomb is simulated and the energy absorption characteristics are obtained.Compared with the energy absorption characteristics under quasi-static compression load,the dynamic impact strength is found to be higher than the quasi-static compression strength,and increase with the impact velocity increase,and the volatility is larger than the static pressure.(3)Quasi-static compression and drop-hammer impact experiments on cylindrical honeycomb.First,the quasi-static compression experiment is carried out to verify the correctness of the simulation and the theoretical model.Secondly,the quasi-static compression comparison is made between the cylindrical honeycomb and the two-dimensional honeycomb with the same specifications to obtain a honeycomb structure with about 15%.Finally,the correctness of the dynamic impact simulation model is verified by the drop-weight impact test on the cylindrical honeycomb.(4)Cylindrical honeycomb is taken as the energy-absorbing element to design the anti-climbing absorber of the vehicle,and the corresponding theoretical and experimental studies are carried out.First,the design of anti-climbing absorber with cylindrical honeycomb as the energy-absorbing element is carried out.Secondly,the theoretical feasibility is verified through vertical loading and quasi-static compression simulation of anti-climbing absorber.Finally,the experimental samples were fabricated and subjected to vertical loading,quasi-static compression and dynamic impact tests to verify that the anti-climbing absorber meets the design requirements and provides theoretical and experimental basis for the practical application of the cylindrical honeycomb.