Abstract
This paper proposes an effective method for controlling the morphology of impulsive pressure waves in hydro-spark forming, making use of the technique of underwater shock wave focusing. Free forming experiments using ellipsoidal reflectors with two kinds of minor-to-major axis ratios b / a =0.6 and 0.8 are performed under several blank-setting conditions. The height of the formed product depends solely on the impulse of the shock wave, regardless of its focusing behavior, while the shape of the product is controlled by distribution of the applied pressure wave. It is demonstrated that the reflector having b / a =0.8 yields a wide range of pressure distribution, which can be estimated from the shock wave front distribution calculated considering the effect of non-linear reflection.
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