...Sudarshan Rangaraj; Klod Kokini, Fellow ASME This work describes the application of two-dimensional finite element models with a cohesive zone to study quasi-static crack extension in functionally graded Yttria stabilized Zirconia (YSZ)-Bond Coat (BC) alloy (NiCoCrAlY) thermal barrier coatings (TBC...

...A. M. Karlsson Recent studies have shown that Pt-aluminide—a common bond coat material in thermal barrier coatings—undergoes martensitic transformations during thermal cycling. The transformations are associated with both large transformation strain and a strain hysteresis, leading to accumulation...

...Wangang Xie; Kevin P. Walker; Eric H. Jordan; Maurice Gell This paper describes the implementation and modification of a previously proposed unified viscoplastic constitutive model to simulate the behavior of a Yttria Stabilized Zirconia plasma sprayed thermal barrier coating. The model was recast...

... phenomena thermal barrier coatings austenitic stainless steel plasma arc sprayed coatings porosity crack-edge stress field analysis ultrasonic materials testing crack detection voids (solid) microcracks scanning electron microscopy For fossil fuel fired power generation, higher thermal...

...Mark E. Walter; Bolarinwa Onipede; Wole Soboyejo; Chris Mercer Thermal barrier coating (TBC) systems are receiving a great deal of attention as a result of their ability to enable higher operating temperatures without sacrificing component durability in gas turbine systems. Nonetheless...