The Thermal Stress and Deformation in Cartridge Cases

: A refined theoretical model for predicting the states of stress, strain and displacement in a cartridge case is presented. The results are valid during loading of the case, but prior to the time at which the case is extracted from the weapon. The combined effects of thermal and mechanical loading due to propellant gas products are included. The applied temperature may be steady state of transient. The case is modeled as a thermo-elasto-plastic metal with linear workhardening using the Tresca yield criterion. The weapon chamber is elastic. The simple expressions for the stresses, strains and displacements are algebraic, requiring only the solution of several 4 X 4 matrices. No numerical results are presented.