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Proceedings Paper

Dynamical Properties Of Impacted Target By Using Laser Doppler Velocity Interferometer (Ldvi)
Author(s): Jai Ki Kim; Sang Soo Lee
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Paper Abstract

A laser Doppler velocity interferometry for measuring the velocity of reflecting free surface is developed and applied to the investigation of the bulging properties of a steel target. The instantaneous free surface motion of the target impacted by a steel projectile driven to 25.6m/sec by shock wave, is observed by using a laser Doppler velocity interferometer. The measuring time is synchronized with the impact time by using a trigger pin. As the projectile with the flat elivated nose approaches to the target, the trigger pin first makes contact to the projectile and at the instant of the impact, a signal pulse for triggering oscilloscope is genetated. Initially thick targets (1.2 - 2.4cm) are used for the measurement of the elastic motion of the free surface, and their maximum velocities are measured. In the thinner target, the free surface gets bulging plastic deformation. Its maximum bulging velocity, which depends on the thickness of the target, is measured for thickness 0.5 - 0.8cm. It is found the maximum bulging velocity decreases approximately inversely with respect to the thickness of the target. The time and target thickness dependence of bulging deformation of the mild steel is determined for the constant impact velocity. The parameters in Bingham's form of shearing force are also determined from the thickness dependent maximum bulging velocities.

Paper Details

Date Published: 1 March 1983
PDF: 6 pages
Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983);
Show Author Affiliations
Jai Ki Kim, Korea Advanced institute of Science & Technology (Korea)
Sang Soo Lee, Korea Advanced institute of Science & Technology (Korea)

Published in SPIE Proceedings Vol. 0348:
15th Intl Congress on High Speed Photography and Photonics
Lincoln L. Endelman, Editor(s)

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