Chapter 48. Creep-Induced Strengthening of Soda-Lime Glass and Silicon Nitride
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1996 The American Ceramic Society
Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3
How to Cite
Jakus, K., Ritter, J. E., Atri, R. and Widjaja, S. (1996) Creep-Induced Strengthening of Soda-Lime Glass and Silicon Nitride, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch48
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1996
Print ISBN: 9780470375426
Online ISBN: 9780470314821
Creep-induced strengthening of glass and hot-pressed silicon nitride specimens with a stress concentration was studied. Single-edge-notch flexure bars were crept in 3-point bending with the notch in tension. When the specimens were cooled under load, a compressive stress was expected to develop around the notch due to stress redistribution during creep. Post-creep strength tests showed that there was significant strengthening in glass even though no residual compression was predicted by Finite Element Analysis for this material. The observed strengthening was attributed to crack blunting by localized creep at crack tips. Possible creep-induced strengthening in Si3N4 was obscured by strength changes due to oxidation and/or creep damage during the high temperature exposure.