Aim The fields of temperature

temperature grads

thermal stress

thermal strain of barrel in large caliber antiaircraft machine gun fired continually are studied. Methods The FEA methods is adopted when the physical model and FEA model are founded and the boundary condition of FEA model are loaded. The distribution of temperature

temperature grads

thermal-stress

thermal-strain are analyzed. Results The temperature

temperature grads

thermal-stress

thermal-strain of barrel in large caliber antiaircraft machine gun fired continually are presented. Conclusion Thermal pulse affecting thermal-stress

thermal-strain is the subordinate factor at first

then it becomes the primary factor. So

thermal pulse is the primary origin of thermal-stress

thermal-strain of barrel. At the same time

it is the primary factor resulting in destroying the barrel.