Compression Experiments and Axial Buckling Stability Analysis of Molded Combustible Cartridge Cases
To ensure the structural integrity of molded combustible cartridge cases in gun weapon sys-tem,axial compression experiments and buckling stability analysis were carried out.Through the com-pression deformation process of the cartridge cases sample,it can be known that the key of stability a-nalysis is to solve the elastic-plastic buckling problem.Then,axial compression stability models with consideration of the material and geometric nonlinear properties were constructed,and the relative de-viation between the critical load,the buckling deformation and the tested results was 5.9％and 2.3％.Under the condition of equal thickness structure,the nonlinear buckling law of the whole car-tridge case was presented by changing the length-radius ratio and the radius-thickness ratio,and the most sensitive factor is the radius-thickness ratio determined by the correlation analysis.Moreover,the buckling responses of the stepped and the tapered variable thickness structures were compared,which in-dicated that the taper type could obviously improve the structural stability of the whole cartridge case.When the thickness ratio is set to 2 in the taper type,the critical load increases by 27.4％and buckling deformation is reduced by 29.2％while the charge volume only decreases by 4％.The obtained results can provide a basis for the application and the optimization design of combustible cartridge cases.
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