Saim Abbas, Sanjay Sampath, Sudhanshu Mallick, B. Nagamani Jaya
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Influence of Geometry on Interface Fracture Energy Measurements of Thermal Spray Coatings
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 (GC) are found to be geometry dependent, with the modified clamped beam yielding a GC of 56 ± 16 J/m2, while the modified cantilever results in a GC of 89 ± 5 J/m2. The role of the phase angle and stress state on GC 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.
期刊介绍：
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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