Chapter 23. Modeling of Ceramic to Metal Brazed Joints
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1989 The American Ceramic Society, Inc.
Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12
How to Cite
Charreyron, P. O., Patten, D. O. and Miller, B. J. (1989) Modeling of Ceramic to Metal Brazed Joints, in Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470312568.ch23
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1989
Print ISBN: 9780470374887
Online ISBN: 9780470312568
- thermal expansion;
- ceramic/metal bonds;
- finite element analysis (FEA)
Closed form solutions are derived for the stress field at a rigid interface between materials of dissimilar thermal expansion. The crack tip stress singularity is characterized by a Mode II stress intensity factor increasing tike the square root of bond length. A fine mesh finite element analysis shows that braze ductility blunts but does not eliminate bond terminus singularities. It also points out the negative effect of strain hardening. The Dugdale model is used to derive a stress function for the stresses in adherends joined via a plastic interlayer. An approximate form of stresses in the braze is presented. The Dugdale model predicts infinite tensile stresses in the ceramic at bond edges because of surface load discontinuity. It also allows estimation of the extent of braze yielding. Finally, the applicability of a linear elastic fracture criterion is discussed.