Bending-based techniques measure interface fracture energy in alumina coatings on mild steel, indicating geometric dependency.
Two novel bending‐based interface fracture energy measurement techniques, the modified clamped beam and the modified cantilever, are compared on a model system consisting of air plasma–sprayed alumina over mild steel. Multiple values of interface energies are obtained on the same sample using digital image correlation (DIC)–based crack opening displacement (COD) measurements, converting both these techniques into high throughput. The mean and standard deviation in interface fracture energy ( G C ) are found to be geometry dependent, with the modified clamped beam yielding a G C of 56 ± 16 J/m 2 , while the modified cantilever results in a G C of 89 ± 5 J/m 2 . The role of the phase angle and stress state on G C and the resulting spread in the data is discussed. The advantages and limitations of the two geometries are contextualized for testing a variety of thermal spray coating/substrate combinations and other ceramic/metal interfaces.
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Abbas et al. (2025) studied this question.
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