钨合金球形破片侵彻低碳钢的弹道极限速度计算模型

The penetration failure characteristics of tungsten alloy spherical fragments penetrating into low-carbon steel plate at different target speeds are analyzed to obtain a ballistic limit calculation model of tungsten alloy spherical fragments penetrating into low-carbon steel plate in a wider speed range. A ballistic limit calculation model including the main mechanical parameters of projectile and target is proposed. The fragment rigidity, plasticity, erosion and fragmentation penetration iare considered in the proposed model. A calculation method of velocity threshold for different failure characteristics of tungsten alloy is established for the need of solving the model. Based on the existing experimental data, the model coefficients are obtained by using trust region method. In addition, the ballistic limit of fragments penetrating into Q235 and Q345E steel plates is test, and the calculation accuracy of the model is analyzed according to the test results. The results show that the calculated average error and maximum error of the model are 10% lower than those of the test results, and the average error of the model is reduced by 60% compared with the existing ballistic limit calculation model.