A parametric study of damage initiation and propagation in EB-PVD thermal barrier coatings

• Published in: Mechanics of materials Vol. 42; no. 1; pp. 96 - 107
• Main Authors: Bhatnagar, Himanshu, Ghosh, Somnath, Walter, Mark E.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 2010; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Crack initiation and propagation; Creep; Cyclic thermal loading; Exact sciences and technology; Finite element method; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Hysteretic cohesive zone model; Inelasticity (thermoplasticity, viscoplasticity...); Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Solid mechanics; Structural and continuum mechanics; Thermal barrier coatings; Finite element method; Thermal barrier coatings; Hysteretic cohesive zone model; Crack initiation and propagation; Cyclic thermal loading; Sensitivity analysis; Creep; Cohesive end; Rupture; Thermomechanical properties; Experimental study; Modeling; Oxide ceramics; Optimization; Crack propagation; Physical vapor deposition; Thermoelasticity; Principal stress; Delamination; Crack initiation; Damaging; Crack

In this paper, finite element models are used to investigate catastrophic failure of thermal barrier coatings (TBCs) due to delaminations along susceptible interface between thermally grown oxide (TGO) and the ceramic top coat. The top coat crack initiation and propagation is investigated using a th...