The Theory Analysis And Experiment Research Of The Strength And Tempera-ture Field Of The Composite Laminated Barrel

The barrel mass occupies a large proportion in the whole of the automatic weapon. This phenomenon is especially outstanding in the large caliber machine gun. In order to satisfy the request that the automatic weapon weight should become much lighter, we must seek the new technology approach. The gun barrel is designed with new type of composite material, which has lighter weight, higher stiffness and strength. At the same time, we must explore the design theory and method suitable for the composite material gun barrel. This paper aims at supplying the theory basis and practical method of composite material gun barrel.In allusion to the characteristic that gun barrel shots bullets at large quantity, high frequency and so on, the author suggests that the composite laminated barrel structure model is composed of heat resistant material liner tube, metal inner tube and composite material outside. The main target is to lighten the barrel weight. At the same time, it takes into account the request of barrel projectile precision, working life, producibility and so on. In order to research stress, strain of the composite laminated barrel and the tube wall temperature distribution, the author established a mechanical model of the composite laminated barrel by adopting elastic mechanics generalized Hooke's Law, secondary damage rule in three-dimensional layer and heat conduction theory. According to this model, by using mathematical methods such as finite difference and pursuant recurrence, the author developed an analytical software in VB programmer environment to simulate the strength and the temperature field of the composite material barrel. With this software, we can simulate and analyze stress, strain, strength and temperature field of different composite laminated barrels. In the finite element software platform of ANSYS, the author established finite element model of the composite laminated barrel, which could solve the strength under many kinds of complex load conditions. At the same time the author calculated the natural vibration frequency of the composite laminated barrel. To meet the research needs, the experiments have carried out and the wall strain, the heat transfer effect and the dynamic temperature of the composite laminated barrel have been measured. The author confirmed the accuracy of the composite laminated barrel mechanics and the temperature field model with the data from the experiment and the finite element analysis. The method of "pre-heating enhanced simulation test" is proposed and developed. By means of tests and measurement on heat resistance of liner materials, promising liner material is determined eventually.Via a great deal of numerical simulation and test investigation, the author has obtained control range of important construction parameters of the composite laminated barrel. Further more, the author has discussed the projectile fire mode which was fit for the composite laminated barrel of large caliber machine gun. All of these can be useful for designing composite material gun barrel.