基于LS-DYNA的杆式弹侵彻规律研究OA

In order to study the penetration performance of long-rod projectile under hypervelocity conditions,numerical simulation model of vertical penetration unreinforced concrete target was established by using ANSYS/LS-DYNA.The influence of the projectile material,length-to-diameter ratio,projectile cone angle and head cone angle on the penetration capability of the long-rod projectile was analyzed within the impact velocity range from 2.0 to 6.0 Ma.The finite element simulation was used to compare the three materials of 93 tungsten alloy,G50 alloy steel and TA7 titanium alloy.The effects of the structural parameters such as the aspect ratio form 4 to 10,the cone angle from 0° to 10° and the head cone angle from 30° to 180° were studied.The results demonstrate that during hypervelocity penetration,93 tungsten alloy exhibits the highest penetration efficiency under identical mass and length-to-diameter ratio,significantly outperforming G50 alloy steel and TA7 titanium alloy.The impact of projectile length-to-diameter ratio and cone angle on dimensionless penetration depth is more pronounced,and their optimal values within the investigated range are 10 and 10°,respectively.The projectile head cone angle is a critical factor affecting the transition speed of hole expansion,and a reduction in head cone angle can enhance the transition speed and penetration efficiency.When the head cone angle exceeds 120°,the penetration depth is beginning to stabilize.Under all tested conditions,the maximum penetration depth occurs at a projectile impact velocity of approximately 4.5 Ma.The results of this study can provide reference for the material selection and structural design of the hypervelocity penetrator warhead.