Study on Wave Formation in Explosive Bonding

概要

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The interface between explosively bonded metals exhibits a wavy shape, but the theory of the formation of wave has not been fully studied. In this paper an experiment on the effect of bonding parameters on the wavelength of wavy interface was made by using the semi-cylinder method and the angular method, and an attempt to explain the mechanism of wave formation was made. The results obtained are as follows : The parameters which have direct effects on the wavelength are both the collision angle and the thickness of flyer plate. The wavelength increases with the collision angle up to a critical angle, beyond which the wave vanishes. When the collision angle is same, the wavelength increases with the thickness of the flyer plate. According to the result of detailed investigation into the fluid behaviour of metals near the interface, the flow pattern at the wavy interface resembles the stream pattern in a fluid having a Karman vortex street, therefore the authors have concluded that the wave formation must be attributed to the vortex street generated behind the collision point, and they tried to estimate the wavelength and obtained the wavelength λ as a function of collision angle γ and the thickness of the flyer plate h has follows ; λ=A/C h(1-cosγ)(Fig. 11 (a)). The values calculated by this equation agreed well with measured values.
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