Triaxial Acceleration Measurement for Oblique Penetration Into Concrete Target

Abstract

To obtain accurate data of the motion parameters of a rigid projectile during the oblique penetration event, a triaxial acceleration measurement device (TAMD) was developed, and a method for the calibration of a high-g accelerometer was presented by using a Hopkinson bar and a grating laser Doppler interferometer. The buffer structure was designed, and the cushioning capacity of it was studied to improve the survivability of the multichannel data recorder. A set of penetration experiments with concrete targets that had average compressive strengths of 35 and 45 MPa was conducted to characterize the response of monolithic concrete targets to projectile impact. The 96-mm-diameter 630-mm-long ogive-nose projectiles were machined from 35CrMnSiA steel and designed to contain a TAMD in the tail of the cavity. The projectiles were launched by a 100-mm-diameter smooth-bore powder gun to striking velocities between 300 and 600 m/s, and impacted the concrete target at an oblique angle of 0°-30°. The acceleration during the launch and the triaxial deceleration during the penetration were successfully recorded by the TAMD. The measured penetration data and deceleration-time data were analyzed.