椭圆截面弹体侵彻混凝土阻力特性研究
Study on the Resistance Characteristics of Elliptical Cross-Section Projectile Penetrating Concrete

为研究椭圆截面异构型弹体侵彻混凝土过程中的弹体头部受力特性，开展圆形及等截面积不同长短轴之比的椭圆截面弹体侵彻混凝土过程数值模拟计算，对不同弹体侵彻过程中头部表面所受法向应力与法向速度关系进行了分析.获得了不同长短轴之比情况下的椭圆截面弹体头部表面所受法向应力与法向侵彻速度、单元所在位置角度之间的关系表达式，并进一步得到了椭圆截面弹体侵深计算公式.结果表明：与等截面积的圆形截面弹体相比，在相同法向速度情况下，椭圆截面弹体表面所受法向应力大小随着头部表面单元位置到椭圆中心距离的增大而增大；在侵彻速度相同时，弹体侵深随着截面长短轴之比的增大而增大.
In order to study the stress characteristics of projectile head during the process of penetrating concrete with elliptical cross-section heterogeneous projectile, numerical simulation of circular and equal cross-sectional area of the elliptical cross-section projectile penetrating concrete process was carried out, and the relationship between the normal stress and the normal velocity on the head surface during the penetration of different projectiles was analyzed. The relationship between the normal stress and the normal penetration velocity of the elliptical cross-section projectile's head surface at different ratios of the major axis to the minor axis and the position of the element was obtained, and the elliptic cross-section body penetration calculation formula was also obtained. The results show that compared with the same cross-sectional area of the circular cross-section projectile, and at the same normal velocity, the normal stress of elliptical cross-section projectile surface increases with the distance from the element of the head to the center of the ellipse. At the same penetration velocity, the penetration depth of the projectile increases with the ratio of the major axis to the minor axis of the cross section