Chapter 48. Creep-Induced Strengthening of Soda-Lime Glass and Silicon Nitride

  1. John B. Wachtman Jr.
  1. Karl Jakus,
  2. John E. Ritter,
  3. Revti Atri and
  4. Sujanto Widjaja

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch48

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

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

Author Information

  1. Department of Mechanical Engineering, University of Massachusetts Amherst, Massachusetts 01003

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • concentration;
  • modification;
  • transformation;
  • evaluate;
  • implementation

Summary

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.