| Suspension track train is a kind of rail transportation system.It has no influence on the ground traffic due to the suspension of air rail train in the air,and it can disperse the ground traffic pressure.As an important branch of urban rail transit,the suspension track train can be used as a supplement in the existing urban public transport system in our country.Because the suspension track train works in the air,so the weight of the suspension track train has a great impact of its bearing capacity.In order to improve its carrying capacity,lightweight design is the main means.The carriage panel has a important influence on the lightweight of the suspension track train as an integral part of the air rail train.Carbon fiber-aluminum honeycomb sandwich panel has the advantages of small specific gravity,high specific stiffness ratio,sound insulation,noise reduction,thermal insulation and other excellent properties.It can be applied to the suspension track train,which can effectively reduce the weight of the train and improve the ride comfort of the train.Stiffness is an important performance index of carbon fiber-aluminum honeycomb sandwich panel,the study on the stiffness of carbon fiber-aluminum honeycomb sandwich panel was studied in this paper.In this paper,in the same structural parameters of aluminum honeycomb core,theoretical calculation,simulation and experiment study were used to get stiffness of sandwich panel in different layer form,and the flexural stiffness were analyzed by three method in this paper.Firstly,the equivalent formula of honeycomb core and laminated plate theory were analyzed in the paper.According to the clear honeycomb core specification,the axial elastic modulus was obtained by equivalent calculation;and the bending stiffness was obtained by using the laminated plate theory of equivalent carbon fiber-aluminum honeycomb sandwich panel.Secondly,the simulation model of carbon fiber-aluminum honeycomb sandwich pane was establish in ABAQUS,through putting uniform load on the middle area of the upper surface,the relationship between the load and the maximum strain in the middle position of lower surface was calculated in the software,and the fitting line graph was draw in MATLAB to get the slope and the bending stiffness;According to the compare of the equivalence theory value and simulation value,the results were almost consistent and the theory of the maximum difference is 11.3%.Finally,8 kinds of test pieces were made,and the bending stiffness of Carbon fiber-aluminum honeycomb sandwich panel was tested by the universal testing machine and the resistance strain gauge.Compared with experimental data and the theory value for each group,the bending stiffness values got in experiment are very close to the results in theoretical simulation,there has mostly 8.6% difference between average values and simulation values,and 8.1% difference between average values and theoretical values.It can be seen that the simulation and theoretical calculation can effectively analyze the bending stiffness.Analysis of the carbon fiber panel layer angle,stacking sequence and layer thickness were also studied to get the influence to the bending stiffness.According to the results,we can get the conclusion: the smaller ply angle and larger thickness of carbon fiber panel,the greater bending stiffness of it,and the influence of stacking sequence on the bending stiffness is very small.The results of this study have practical significance for the design of carbon fiber-aluminum honeycomb sandwich panel. |
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