Research On The Reinforced Aluminum Honeycomb's Energy Absorption Characteristics And Application

Aluminum honeycomb,with the advantages of light weight,easily deformation under compression and easily controlled,and less affected by the environment,is widely applied to aerospace,rail transportation,automobile manufacturing,construction and other fields,which can be acted as energy absorbing structure to alleviate the impact on the product and person,it also can be used for sound and heat insulation,etc.The anisotropic of the honeycomb structure makes it possible to withstand the load in different directions and absorb energy by the form of compressive deformation.In order to make better use of the energy absorption effect of honeycomb structure,not only to improve the strength of honeycomb but also to realize the miniaturization and light weight of honeycomb energy absorber,a reinforced honeycomb structure is proposed in this paper,which strength is improved obviously and is adjustable.At present,the research on the energy absorption characteristics of the reinforced honeycomb structure is not enough at domestic and overseas,it is necessary to study about the theoretical model,the static and dynamic compression simulation analysis,at last the corresponding experiment is needed to verify the above analysis.The hexagonal honeycomb's theoretical model of average stress under out of plane compression is analysised at first.On this basis,compression average stress model of the "1+1" type reinforced honeycomb that under out of plane was built according to the simplified super folding unit theory with Tresca and Mises yield criterion,respectively.The model was compared with hexagonal honeycomb average stress to analysis the change rule of honeycomb's strength,and to further establish the reinforced honeycomb average stress model for other specifications.This paper analyzed the evaluation method of the energy absorption characteristics of the honeycomb energy absorper,analyzed the factors that affect the energy absorption characteristics of the honeycomb,and compared the energy absorption characteristics of the reinforced honeycomb and the regular hexagonal honeycomb.Taking the whole honeycomb structure as the simulation object to research the energy absorption characteristics of honeycomb under out of plane compression.The simulation results verified the correctness of theoretical analysis of the reinforced honeycomb.Three types of speed were taken to simulate the compression under impact,prepared their modes of deformation and average stress,the energy absorption characteristic of regular hexagonal honeycomb and reinforced honeycomb was prepared at the same time.The quasi-static compression experiment was conducted to further verify the correctness of theoretical analysis and simulation calculation,the experimental results in good agreement with theoretical analysis,it also verified that the average stress theoretical model was more accurate based on Mises yield criterion.In this paper,the reinforced honeycomb was applied to the anti-climber.According to the requirements of rail train for anti-climber,a kind of backward guiding honeycomb type anticlimber was designed that based on the analysis of requirements.The designed anti-climber was filled with "4+1" type honeycomb that can satisfy the requirements,which meet the requirements while achieve a minimum volume.The ablity of vetical load was also tested by simulation and experiment.After meeting the requirements of vetical load,longitudunal compression was carried on anti-climber through the drop-testing machine to simulate vehicle collision conditions.The results of experiment indicated that the reinforced honeycomb type anti-climber was well satisfied the design requirements,and has a good application prospect in the field of rail traffic safety passive protection.The reinforced honeycomb structure proposed in this paper can improve the strength of honeycomb without changing the production process,and the strength of honeycomb can be adjusted by changing the space of the reinforced layer.In this paper,the mechanical properties and energy absorption characteristics of reinforced honeycomb were studied by theoretical analysis,simulation calculation and experimental verification,which lay the foundation for engineering application of the reinforced honeycomb in the buffer energy absorber.