薄基体装甲钢弹击侵彻行为与极限抗弹性研究

Study on Penetration Behaviors and Ultimate Anti-ballistic Performance of Thin Matrix Armor Steel

采用计算机仿真分析研究4.6 mm厚薄基体装甲钢在53式7.62 mm普通钢芯弹不同弹速下的侵彻行为,利用最小二乘法对不同弹速下靶板抗弹性参数(背凸高度与弹坑深度)进行回归分析,以构建抗弹性参数与弹速间的数学模型,进而结合靶板击穿时的背凸高度与弹坑深度,对该靶材极限抗弹弹速进行预测。仿真分析过程中靶板材料参数设置选用忽略温度影响的简化Johnson-Cook本构模型,相应模型参数由准静态与动态压缩应力-应变曲线计算所得。为确保预测模型准确,对靶板进行不同射距下的打靶测试,而后利用打靶实测结果对预测模型进行修正。研究结果表明:仿真计算结果与打靶实测结果吻合度较高,弹坑深度与背凸高度的仿真计算精度分别达86.5%与88.2%;该薄基体装甲钢抗弹性优良,其弹击失效的极限弹速预计为1000 m/s左右;在所考察弹速范围内,靶板背凸高度(H)和弹坑深度(D)与弹速(v)和弹速平方(v^(2))均近似成线性正比关系,修正后分别满足关系式H=-9.575+0.01644v,H=-3.213+1.05988×10^(-5) v^(2),D=-13.425+0.02372v与D=-4.247+1.52939×10^(-5) v^(2),且经修正后的数学模型预测精度均达92%以上。

In this paper,the penetration behaviors of 4.6 mm thickness armor steel under different projectile velocities of type 537.62 mm common steel core bullet were studied by computer simulation analysis.The anti-ballistic performance parameters(including back projection height and crater depth)of the target plate under different projectile speeds was calculate by regression analysis with the least square method.Furthermore,a mathematical model between anti-ballistic performance parameters and projectile speed was constructed.And then,combined with the back projection height and crater depth when the target plate was shot through,the ultimate resistance velocity of the target was predicted.During simulation,the simplified J-C constitutive model was selected to set the material parameters of the target plate ignoring influence of temperature.The corresponding model parameters were calculated from the quasi-static and dynamic compressive stress-strain curves.In order to ensure the accuracy of the prediction model,the anti-ballistic performance of target plate was tested at different shooting distances.Thereby the prediction model was modified by using the actual measured results.The results show that,the simulation results are in good agreement with actual shooting results,and the simulation accuracy of crater depth and back projection height reach to 86.5%and 88.2%,respectively.This thin armor steel shows excellent anti-ballistic performance,and the ultimate velocity of its impact failure is estimated to be about 1000 m/s.Within the velocity range of the projectile,the back projection height(H)and crater depth(D)of target plate are approximately linear to the projectile velocity(v)and the square velocity(v^(2)),which could be expressed as H=-9.575+0.01644v,H=-3.213+1.0598810^(-5) v^(2),D=-13.425+0.02372v and D=-4.247+1.5293910^(-5) v^(2) after modification,and the prediction accuracy of all the modified models are above 92%.