Chapter 23. Modeling of Ceramic to Metal Brazed Joints

  1. John B. Wachtman Jr.
  1. Pierre O. Charreyron,
  2. Donald O. Patten Jr and
  3. Bradley J. Miller

Published Online: 26 MAR 2008

DOI: 10.1002/9780470312568.ch23

Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12

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

Author Information

  1. Norton Company Advanced Ceramics Goddard Road Northboro, MA 01532–1545

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374887

Online ISBN: 9780470312568

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Keywords:

  • thermal expansion;
  • intensity;
  • ceramic/metal bonds;
  • microstructures;
  • finite element analysis (FEA)

Summary

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.