A modified boundary layer modeling approach is used to predict the fracture toughness and crack resistance behaviors of solid oxide fuel cell (SOFC) materials. In this approach, a pre-existing crack inside a layer or at an interface between two different layers is assumed under plane strain conditions. Fracture is allowed to occur in a small process window situated at the crack tip. The process window is contained in a circular region, which can involve two different materials and their interface. Elastic asymptotic crack-tip fields are prescribed as remote boundary conditions. Special attention focuses on the cracking of the interface between the glass seal and the electrolyte material.
Revised: July 13, 2011 |
Published: January 1, 2004
Citation
Nguyen B.N., B.J. Koeppel, P. Singh, M.A. Khaleel, and S. Ahzi. 2004.Numerical Characteriztion of the Fracture Behavior of Solid Oxide Fuel Cell Materials by Means of Modified Boundary Layer Modeling. In 28th International Conference and Exposition on Advanced Ceramics and Composites, 25-30 Jan. 2004, Cocoa Beach, FL, USA. Published in: Ceramic Engineering and Science Proceedings, edited by E. Lara-Curzio, M. J. Readey, 25, 393-399. Westerville, Ohio:The American Ceramic Society.PNNL-SA-40285.