International Journal for Multiscale Computational Engineering

ISSN for PRINT: 1543-1649

For Online Access

Best Paper Award Selection - Editorial Board Site

2007, Volume5

Issue 3-4

189 pages

DOI: 10.1615/IntJMultCompEng.v5.i3-4

Issue price - $276.00

Himanshu Bhatnagar
Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210, USA

Mark E. Walter
Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210, USA

Somnath Ghosh
Ohio State University

Despite providing superior protection of engine components from severe temperatures, thermal barrier coatings are susceptible to catastrophic failure due to large-scale interfacial delamination. Under operating conditions, interfacial waviness increases due to bond coat creep and the cyclic nature of the thermal loading. Recent analyses show that the top coat incurs cracks at the sites of interfacial undulation. The top coat cracks propagate and coalesce under cyclic thermal load, which leads to catastrophic interfacial delamination. In this article, a finite element model of the thermal barrier coating (TBC) system is developed in the commercial code ABAQUS to investigate dependencies on various parameters and to develop a simplified parametric understanding of the top coat crack initiation and propagation. A parametric domain map for assessing crack initiation and propagation is developed in terms of geometric parameters of the TBC. Thus the domain map identifies which TBC geometries yield a fail-safe

DOI: 10.1615/IntJMultCompEng.v5.i3-4.50 Download article, 227-242 pages

Article price - $35.00

<< Previous article   Next article >>