ForschungPublikationen
A computational framework for the interplay between delamination and wrinkling in functionally graded thermal barrier coatings

A computational framework for the interplay between delamination and wrinkling in functionally graded thermal barrier coatings

Kategorien Artikel in Fachzeitschriften
Jahr 2015
Autoren José Reinoso, Marco Paggi, Raimund Rolfes
Veröffentlicht in Journal: Computational Materials Science.
Beschreibung

Stiff films bonded to compliant substrates are used in a wide range of technological applications and especially in thermal barrier coatings (TBC). Thin films can be made of Functionally Graded Materials (FGMs) with a heterogeneous composition that usually range from a metallic to a ceramic phase. Aiming at investigating the phenomenon of delamination of thin FGM layers from compressed elastic substrates, a fully 3D nonlinear computational framework combining nonlinear fracture mechanics based on a novel interface element formulation for large displacements and a solid shell finite element to model the thin film is proposed. A comprehensive numerical analysis of delamination in TBCs is carried out, paying a special attention to the interplay between fracture and wrinkling instabilities. Results of the computations are also compared with benchmark 2D semi-analytical results, showing good accuracy of the proposed method that can be applied to general 3D configurations that are difficult to address by semi-analytical approaches.

DOI 10.1016/j.commatsci.2015.08.031