LASER INDUCED SPALL IN ALUMINUM AND COPPER

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Abstract
Spall at ultra high strain rate was investigated using short, pulsed laser induced shock waves in metallic foils. All the stages of damage evolution from incipient to complete perforation of the target, were observed. A phenomenological model was developed for laser produced spall in the 100 kilobar regime. By substituting the experimental values in the model, spall pressures of 26 ± 6 kbar for pure Al and 28 ± 6 kbar for pure Cu at strain rates of 3x107 sec-1, were found. The experimental results of energy threshold for spall, and of spall width, were in good agreement with the values deduced from simulations

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