【摘要】 针对持续射击状态自动步枪枪管瞬态温度和变形预测问题,建立枪管的热弹耦合轴对称有限元计算模型,通过与实验结果对比,验证了模型的正确性。计算获得了连续射击150发过程中枪管温度和变形情况,分析了枪管壁厚和射击频率对枪管瞬态温度和变形影响情况。计算结果表明:小口径自动步枪枪管外径越大,150发连发射击后残余温度和径向热弹变形越小;射击频率降低15%,对枪管150发射击后的残余温度和径向残余变形影响不大。更多还原

【Abstract】 Aiming at predicting the temperature and deformation of automatic rifle’s barrel in successive firing process, a thermal-elastic coupling axial symmetry finite element model was established. Compared with the experiment results, the correctness of the model was verified. The temperature and deformation situation of gun barrel during 150 successive firing processes were calculated. Analyze the influence of barrel wall thickness and firing frequency on barrel transient temperature and deformation. The calculation results show that the barrel wall thickness of small caliber automatic rifle increased, less residue temperature and deformation of gun barrel after 150 successive shooting decreased. When firing rate decreases 15%, residue temperature and deformation of gun barrel have not change.更多还原