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THE PRESENT WORK FOCUSED ON THE STRESS RESPONSE OF ANISOTROPIC 30SIMN2MOVA STEEL GUN BARREL UNDER COUPLED THERMO-MECHANICAL LOADS, NAMELY, THE CONTACT PRESSURE AND FRICTION OF PROJECTILE, THERMAL LOAD AND PRESSURE OF PROPELLANT GAS. THE EFFECT OF TEMPERATURE ON THE MECHANICAL PROPERTIES OF GUN BARREL WAS ALSO CONSIDERED. FINITE ELEMENT ANALYSIS WAS EMPLOYED TO CALCULATE THE NONLINEAR COUPLED PROCESSES. TWO THERMAL-DISPLACEMENT COUPLED FINITE ELEMENT MODELS (FEM) WERE BUILT BY ABAQUS SOFTWARE. THE FIRST WAS THE INTERACTION MODEL OF PROJECTILE AND BARREL WHICH WAS TO CALCULATE THE STRESS OF BARREL ENGRAVED BY COPPER JACKET AND STEEL JACKET PROJECTILE. THEN THE RESULTS OF BARREL IN THE INTERACTION MODEL, AS AN INITIAL CONDITION, WERE IMPORTED TO THE SECOND FEM WHICH WAS APPLIED WITH THERMAL LOAD AND PRESSURE OF PROPELLANT GAS. USING THIS METHOD, THE COMBINED EFFECT OF PROJECTILE AND GAS ON THE BARREL WAS OBTAINED. THE RESULTS SHOWED THAT THE RIFLING AT CHAMBER THROAT HAS THE LARGEST STRESS AND CIRCUMFERENTIAL STRESS UNDER COUPLED LOADS. IT GIVES A REQUEST THAT THE GUN BARREL SHOULD HAVE THE BETTER CIRCUMFERENTIAL MECHANICAL PROPERTIES. BESIDES THE PLASTIC DEFORMATION OF THE RIFLING AT THE CHAMBER THROAT WAS OBSERVED WHICH GAVE THE REASON THAT 30SIMN2MOVA GUN BARREL HAD A LOW SERVICE LIFE PARTLY.
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