A laser technique for evaluating the spall resistance of brittle coatings was demonstrated. The method utilizes laser heating to motivate the spall by generating compressive stress in the coating. Critical exposure to laser heating thereby causes spalling at defective regions of the coating (nondefective regions are apparently immune to spalling). The laser spall results were calibrated against indentation tests in conjunction with a spalling criterion based on a critical bending strain.
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Loh et al. (1986) studied this question.
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