Abstract
An elastica bend test is described that provides a rapid, convenient, and reproducible means for examining the interfacial delamination of brittle coatings on ductile substrates. By bending a coated strip into a half-loop and examining the microscopic cracking that is observed on the sample surface as the loop size decreases, information is obtained about the characteristic initial, mean, and final strains ε i, ε m and ε f that describe the distribution in strength of the coating. By measuring the distance between the cracks at high strains, we obtain an estimate of the interfacial shear strength τ.
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