Simulation Analysis Of Temperature Field During Projectile Penetration

When a projectile penetrates a deep target at high speed,it needs to overcome the penetration resistance and the huge friction between the projectile and the medium.The energy lost by friction is mainly converted into heat energy.The thermal energy is mainly represented by the thermal effect of the projectile during penetration,that is,the surface of the projectile melts,and the temperature rise reaches the melting point of the material,causing the asymmetric distribution of the thermal stress on the projectile head,causing the projectile penetration trajectory to shift and reducing the penetration depth.Therefore,the study of the temperature distribution during penetration provides a reference for the correction of the yaw offset of the projectile.In this thesis,by analyzing the mechanism of plastic deformation work and frictional heat generation work during projectile penetration,the penetration heat conduction plastic analysis model is used to derive the thermal equilibrium equation,and then the projectile surface temperature distribution is calculated.Then,the Richter residual velocity energy method was used to evaluate the temperature rise conclusion.Taking 7.62 mm armor-piercing projectile as the research object,the thermal effect of penetrating different impedance media is simulated and analyzed.It is concluded that the ceramic target and the aluminum alloy target have a large impedance and cannot be corrected.The soil target can be corrected,but it needs to increase friction to do work,that is,increase Soil target thickness.For thin plates,the high-impedance target projectile breaks through,and the low-impedance target projectile temperature rise range is too small,so the medium-impedance medium aluminum alloy is taken as the research object to study the surface of the projectile during penetration with different penetration speeds and different incident angles The effect of temperature rise.The results show that during the penetration of the projectile into the aluminum alloy plate,inorder to achieve the expected penetration effect and avoid the temperature rise of the projectile being too high,vertical penetration or a small angle of incidence should be used.This thesis simulates the non-positive penetration of the projectile into the semi-infinite thick soil target,and obtains the absolute temperature difference between the two sides of the projectile,the pressure value of the medium to the projectile,and the duration of the temperature difference,which provides a basis for subsequent simulations;Ballistic trajectory,increase penetration depth,increase projectile's impact on deep targets.