Abrasion Behavior Research Of Coating Based On ABAQUS

Currently, automatic weapons firing accuracy have become increasingly demanding,projectile during launch, gunpowder temperature 2000℃ ~ 3000℃ gas to barrel thermal shock, and very short duration of action, it will generate in the vicinity of the surface of the bore the temperature difference between the instantaneous dynamic effect, so that the inside surface of a very large thermal stress. Continuous emission, continuous pulsed with heat shock exacerbate hot barrel of the barrel so that the cumulative expansion of large thermal stress coupled with friction cause the inside surface of the projectile caused an abrasion,resulting in lower shooting accuracy, barrel shortened life expectancy.In this paper, 89 type 12.7mm heavy machine gun Case, for example, the use of computer simulation technology, dynamic explicit solver using the ABAQUS finite element simulation software barrel wear behavior were studied.The key point of friction and wear research Barrel:First, heat transfer and friction and wear models basic theory. Combined with internal ballistics theory and heat exchange in the form of heat transfer on the barrel of the theoretical analysis and solving life-sized tube propellant gas temperature heat transfer process required boundary conditions.Secondly, as used herein, the physical quantity with a dimensionless unit and material properties and parameters used to collect induction, friction and wear model established herein. Respectively mesh model, constitutive relation, Barrel wear characteristics are analyzed to determine the mesh density and mesh type constitutive model and material used in this article.Third, wear characteristics simulated firing 120 rounds of ammunition status pants tube analysis speed bullets, gunpowder and impact of stress field and temperature of the fluid pressure on the gunpowder barrel temperature field and thermodynamic properties of barrel of a detailed analysis.Finally, the high velocity bullet in the bore of stress analysis,the establishment of a bullet and the coating of friction and heat equivalent model, usingexplicit method for solving power of the barrel thermodynamic characteristics were analyzed,whereby frictional heat on the body pipe coating thermodynamic properties.Study on friction and wear behavior of the bullet barrel coating, showing the distribution of the coating barrel wear and wear condition and the effect of the coating friction and wear bullet firing increase in the number of the barrel. The results showed that the barrel wear mainly in the proximal end of the gun position, with the increase in the number of bullet firing a corresponding increase in the cumulative amount of wear and there is a small amount of a single amount of wear is reduced, while the establishment of a total amount of wear transmit multiple bullets formula. In this study, friction and wearing of the barrel to provide a certain significance.