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The crack tip deformations and strain energy release rates were calculated for interface cracks in multilayer ceramic coatings subjected to transient heating followed by cooling. It was shown that the interface nearest to the surface of the coating experiences the largest G. As the length of the crack increases, G becomes significantly larger. Reducing the thermal expansion coefficient and modulus of elasticity of the coating reduces the maximum interfacial strain energy release rate.
Interface cracks, multilayer ceramic coatings, thermal loads, strain energy release rate, thermal expansion coefficient, modulus of elasticity
Professor, School of Mechanical Engineering, Purdue University, West Lafayette, IN
Doctoral Student, Mechanical Engineering, Purdue University, West Lafayette, IN