Numerical Simulation Of Temperature Stress Filed And Fatigue Life Analysis For Artillery Barrel

The artillery barrel is under high temperature and high pressure coupling impact load during the process of aritllery launching. With the shooting number increasing, the material mechanical strength of artillery barrel will be reduced. When the decreased strength of artillery barrel closes to the yield limit strength of material, the artillery barrel is easy to damage, so as to affect the service life of the artillery barrel. In this paper, using finite element method and considering the high temperature and high pressure caused by propellant gas duiring the process of shooting, temperature transient thermal response and stress response of artillery barrel were studied in different situation and rules under natural cooling. The change laws of temperature and stress field of artillery barrel were research. And the fatigue life of the artillery barrel under different conditions were calculated. So as to provide reference for the strength of the artillery barrel design. The main contents and conclusions are as follows:Using the finite element method to calculate the transient temperature field of the artillery bareel, transient thermal responses of the artillery barrel were researched under different firing condition including single-shot firing, slow firing of ten-shot and rapid firing of ten-shot. Through the simulation calculation of the transient temperature field for different shooting conditions, the changing laws and distributions in radial and axial directions of the artillery barrel temperature field were studied under natural cooling condition. In the process of artillery launching, artillery barrel wall temperature rises rapidly under the effect of powder gas, and heat transiferes from the artillery barrel inner surface to outer wall. The heat generated by the gunpowder gar burning can not come out through the artillery barrel heat exchange with the outside world completely at each shot interval the process of multiple continuous shooting. The temperature of the artillery barrel under the condition of multiple continuous shooting will continue to rise. The shorter the shooting time interval, the faster the temperature rise. This will effect the mechanic properties of material and the strenghth of artillery structure, at same time descrise the life of artillery.Using ANSYS software to study the transient stress field of artillery barrel, transient stress responses of the artillery barrel were researched under different firing condition including single-shot firing, slow firing of ten-shot and rapid firing of ten-shot. Through the simulation calculation of the transient heat stress field for different shooting conditions, the changing laws and distributions in radial and axial directions of the artillery barrel Mises stress field were studied under natural cooling condition. In the process of artillery launch, artillery barrel is under higher Mises stress condition by the gunpower gas burning, and then the Mises stress declines in a very short period of time. Temperature stress at various points declines quickly along the barrel diameter. The whole barrel reaches the peak Mises stress at the same time. The peak Mises stresses in each firing have no difference in slowly shoting. In rapid continuous shooting condition, shooting instantaneity characteristic determines the peak Mises stress generated in the inner wall of artillery barrel. The affected areaes are limited in barrel wall.The ANSYS software is used for fatigue life calculation of artillery barrel. The results show that the fatigue life of artillery barrel inner wall is409times,356times and265times respectively under the condition of single-shot firing, slowly continue shooting. The fatigue life of the results is limited to the inner wall of artillery barrel.