TY - GEN
T1 - Trajectory and loads for oblique penetration into concrete targets by rigid projectile
AU - Gao, Xudong
AU - Li, Q. M.
N1 - Publisher Copyright:
© 2019 by International Ballistics Society All rights reserved.
PY - 2019
Y1 - 2019
N2 - This paper studies the trajectories and loads of rigid projectiles penetrating into concrete targets with oblique and attack angles, based on differential area force law with an empirical model of free surface effect. Investigations are conducted using 450kg, 300-mm-diameter ogive-nose projectiles, with striking velocities from 600 to 1000m/s, oblique angles from 5° to 25° and attack angles from 1° to 5°. The characteristics of trajectories and loads are summarized. An important characteristic is that the turning of trajectory direction only happens at the earlier stage of penetration, and then the trajectory converge to straight line and keep linear motion until the end. Consistent with the trajectory, the attack angle, lateral acceleration and moment all occur at this stage. The axial acceleration is mainly determined by the initial velocity, but the lateral acceleration and moment are determined not only by initial velocity but also by the initial oblique and/or attack angles. In terms of maximum loads of lateral acceleration and moment, the combined influence of initial oblique and attack angles is larger than a single factor. There exist a proper negative attack angle which can minimize the trajectory turning in oblique penetration cases.
AB - This paper studies the trajectories and loads of rigid projectiles penetrating into concrete targets with oblique and attack angles, based on differential area force law with an empirical model of free surface effect. Investigations are conducted using 450kg, 300-mm-diameter ogive-nose projectiles, with striking velocities from 600 to 1000m/s, oblique angles from 5° to 25° and attack angles from 1° to 5°. The characteristics of trajectories and loads are summarized. An important characteristic is that the turning of trajectory direction only happens at the earlier stage of penetration, and then the trajectory converge to straight line and keep linear motion until the end. Consistent with the trajectory, the attack angle, lateral acceleration and moment all occur at this stage. The axial acceleration is mainly determined by the initial velocity, but the lateral acceleration and moment are determined not only by initial velocity but also by the initial oblique and/or attack angles. In terms of maximum loads of lateral acceleration and moment, the combined influence of initial oblique and attack angles is larger than a single factor. There exist a proper negative attack angle which can minimize the trajectory turning in oblique penetration cases.
UR - http://www.scopus.com/inward/record.url?scp=85085941125&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85085941125
T3 - Proceedings - 31st International Symposium on Ballistics, BALLISTICS 2019
SP - 1807
EP - 1818
BT - Terminal Ballistics, Explosion Mechanics, Vulnerability and Survivability
A2 - Saraswat, V. K.
A2 - Reddy, G. Satheesh
A2 - Woodley, Clive
PB - DEStech Publications Inc.
T2 - 31st International Symposium on Ballistics, BALLISTICS 2019
Y2 - 4 November 2019 through 8 November 2019
ER -