Dynamic cratering process during penetration of rigid projectile into concrete target
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摘要: 为了进一步研究弹体侵彻混凝土靶的开坑作用过程，基于开坑破坏过程分析对开坑阶段进行划分，结合弹体头部形状函数、Z模型流线场分布以及法向膨胀理论，建立考虑混凝土飞溅过程影响的开坑阻力计算模型，并运用文献中试验数据验证模型的可靠性。在此基础上，进一步分析了典型弹靶参数对弹体侵彻混凝土靶动态开坑作用过程的影响规律。研究结果表明：弹体开坑飞溅区范围随弹体头部形状系数和混凝土强度的增大而减小；飞溅区范围达到稳定的时间和动态开坑作用时间随初速和混凝土强度的增大而缩短，随弹体头部形状系数的增大而增大；相较于弹体头部形状系数和混凝土强度，初始撞击速度对动态开坑作用过程的影响更显著。Abstract: In order to study the cratering stage in the dynamic penetration process of projectiles into the concrete targets, the cratering stage is further divided into two phases according to the damage of the projectile during penetration. Combined with the shape function of projectile head, streamline field of the Z model and normal expansion theory (NET), an analytical and calculation model of penetration resistance during the cratering stage is established, which considers the influence of concrete ejection process. Reliability of penetration resistance model during the cratering stage is then verified by test data taken from published papers. The advantages of the present model compared with the existing classical model are analyzed, while the influences of initial impact velocity of projectile, the caliber-radius-head and uniaxial compressive strength of concrete on the dynamic process during the cratering stage are analyzed. With the increase of the initial impact velocity of projectile, the diameter and depth of the ejection region gradually increase, the time of the ejection region to reach the maximum size is gradually shortened, and the time of the dynamic process during the cratering stage is also shortened. With the increase of the caliber-radius-head of the projectile, the diameter and depth of the ejection region gradually decrease, the time of the ejection region to reach the maximum size gradually increases, and the time of the dynamic process during the cratering stage increases, too. With the increase of uniaxial compressive strength of concrete, the diameter and depth of the ejection region are gradually reduced, the time of the ejection region to reach the maximum size is gradually shortened, and the time of the dynamic process during the cratering stage is also shortened. The velocity has the greatest influence on the dynamic process during the cratering stage of the projectile penetration into the concrete target, followed by the caliber-radius-head of the projectile and uniaxial compressive strength of concrete.
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Key words:
- projectile /
- penetration /
- concrete target /
- dynamic cratering
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图 2 弹体侵彻混凝土靶开坑阶段划分
Figure 2. Two phases in the cratering stage during projectile penetration into concrete target
图 3 弹体侵彻混凝土靶的开坑过程
Figure 3. The process of projectile penetration into concrete target
图 7 弹体侵彻混凝土靶体的开坑效应计算流程
Figure 7. Calculation process of crater effect of projectile penetrating concrete target
图 8 弹体侵彻混凝土靶开坑过程的计算结果对比
Figure 8. Comparison of calculation results of penetration process during the cratering stage
图 9 弹体头部形状系数为3时开坑过载计算结果与试验对比
Figure 9. Comparison of acceleration between calculated and test results during the cratering stage of J=3
图 10 弹体头部形状系数为6时开坑过载计算结果与试验对比
Figure 10. Comparison of acceleration between calculated and test results during the cratering stage of J=6
图 11 弹体入靶过程中速度衰减的计算结果与试验结果的对比
Figure 11. Comparison of velocity change between calculation results and test results
图 13 不同撞击速度下混凝土靶的动态开坑作用过程
Figure 13. Cratering process of concrete under different impact velocities
图 14 不同头部形状弹体撞击混凝土靶的动态开坑作用过程
Figure 14. Cratering process of concrete under impact of projectile with different ogive nose shapes
图 15 弹体撞击不同强度混凝土靶的动态开坑作用过程
Figure 15. Cratering process of concrete with different compressive strength of target
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