Dynamical Properties Of Impacted Target By Using Laser Doppler Velocity Interferometer (Ldvi)

Jai Ki Kim; Sang Soo Lee

doi:10.1117/12.967848

1 March 1983 Dynamical Properties Of Impacted Target By Using Laser Doppler Velocity Interferometer (Ldvi)

Jai Ki Kim, Sang Soo Lee

Proceedings Volume 0348, 15th Intl Congress on High Speed Photography and Photonics; (1983) https://doi.org/10.1117/12.967848
Event: 15th International Congress on High Speed Photography and Photonics, 1982, San Diego, United States

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.

Citation Download Citation

Jai Ki Kim and Sang Soo Lee "Dynamical Properties Of Impacted Target By Using Laser Doppler Velocity Interferometer (Ldvi)", Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); https://doi.org/10.1117/12.967848

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