Lightweight Research On The Cabin Considering The Joint Load Of The Skeleton And The Sandwich

As a mobile working platform in the weapon equipment system,the square cabin is widely used in the modern military field because of its good mobility and mobility.At present,my country’s square cabin technology as a whole has problems such as bulky structure and low load-to-weight ratio,which makes it unable to cope with the current changing battlefield environment.The lightweight design can reduce the quality of the shelter structure,thereby improving the maneuverability of the shelter.Therefore,this paper discusses the joint bearing characteristics of the skeleton and the sandwich,and then develops the lightweight design of the shelter.The main research contents are as follows:Cross section optimization design of aluminum alloy profiles.Taking the strength and stiffness as constraints,the lightweight objective function under the joint load of beams and columns is constructed.First of all,the mechanical properties of different closed hollow cross-section profiles are analyzed,and the rationality of the structural design of the profile cross-section shape is explored.Secondly,on the basis of determining the optimal crosssectional shape,the size optimization of aluminum alloy profiles is carried out by using sensitivity analysis and mathematical induction.Finally,the change law between its bearing capacity and section size is studied systematically,so as to obtain the optimal section configuration.In-plane and out-of-plane load-carrying properties of shelter frames.The bearing capacity of the I-beam and the cross-beam are compared and analyzed,and the evolution law of the out-of-plane instability of the roof and floor skeleton is carried out.Combining the flexural characteristics of the beam and the compressive instability characteristics of the column,the in-plane load-carrying characteristics of the side plate skeleton under the joint load of the beam and column are discussed.Through the study of the load-bearing characteristics of the roof,bottom and side plates,the in-plane and in-plane instability characteristics of the cabin frame under different beam-column structure layouts are further revealed.Buckling behavior of aluminum alloy sandwich panels.The failure modes of aluminum alloy sandwich panels under different load types were preliminarily explored.The out-ofplane buckling characteristics of aluminum alloy sandwich panels under different size effects and shape coefficients were analyzed by comparing point-to-plane load characteristics.Combined with the classical laminate theory,the equivalent stability of aluminum alloy sandwich panels was studied.Common load-carrying properties of deck structures.According to the national military standard load spectrum,the out-of-plane instability characteristics of the tank roof and bottom plate under different working conditions are analyzed.Based on the load-bearing characteristics of the frame and the out-of-plane instability characteristics of the sandwich panels,the in-plane load-carrying capacity of the side panels of the square cabin is studied.Finally,through the study of the in-plane and in-plane bearing capacity of the roof,floor and side panels composed of the skeleton and the sandwich,the common bearing characteristics of the shelter deck are systematically discussed.In this study,the mechanical properties of profiles,frames,sandwich panels,and shelter panels were systematically studied by combining experiments and simulations,and the common load-bearing characteristics of frames and sandwich panels were ascertained.The research results can provide a certain reference for the lightweight design of the shelter structure.