The coupled elasto-viscoplasticity-damage model for finite deformation and interface failure in thermal barrier coatings by using the phase field method
Abstract
Thermal Barrier Coatings (TBCs) are essential for protecting engine turbine blades, but their performance is often compromised by the interface debonding and ceramic spalling caused by high-temperature creep and material property mismatches. Therefore, this work introduces a coupled elasto-viscoplasticity-damage constitutive model developed within the framework of large deformation theory to investigate the interface damage mechanisms in TBCs. The coupled model uniquely integrates a crack phase field to simulate fracture in bulk materials with an interface phase field that regularizes discontinuous properties at inhomogeneous material boundaries, allowing both failure types to be described in a unified way. Numerical implementation through Abaqus UMAT and UEL subroutines reveals that TBC failure modes are highly sensitive to coating thickness; thinner coatings primarily develop transverse cracks, whereas thicker coatings shift toward interface delamination. Additionally, the study finds that the plastic deformation of the substrate can actually inhibit interface crack propagation, though lower hardening modulus in the substrate may exacerbate local coating spalling. Ultimately, it suggests that the overall fracture behavior of TBCs can be regulated by adjusting the ratio of interface to coating fracture toughness, providing a vital computational foundation for optimizing the design of layered microstructures to enhance engine safety.
Details
- Organisationseinheit(en)
-
Institut für Photonik
- Externe Organisation(en)
-
Peking University
Tongji University
Bauhaus-Universität Weimar
Duy Tan University
- Typ
- Artikel
- Journal
- Composite Structures
- Band
- 389
- ISSN
- 0263-8223
- Publikationsdatum
- 06.2026
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Keramische und Verbundwerkstoffe, Tief- und Ingenieurbau
- Elektronische Version(en)
-
https://doi.org/10.1016/j.compstruct.2026.120428 (Zugang:
Geschlossen
)
