Chapter 12. Rotating Beam Fatigue Test of Two HPSN Ceramics
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1995 The American Ceramic Society
Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5
How to Cite
Chiu, Y. P. and Folkerts, J. (1995) Rotating Beam Fatigue Test of Two HPSN Ceramics, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch12
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1995
Print ISBN: 9780470375389
Online ISBN: 9780470314784
- thermal stability;
- slag resistance;
- chemical activity
Rotating beam fatigue test has been performed at room temperature for two advanced hot-pressed silicon nitrides (HPSN). Most of the tests were performed in the maximum stress range 590-850 MPa. The tests show three completion modes: fast fracture at set up, fatigue failure and runout (or suspension). The fatigue lives are widely scattered for both materials. First the median fatigue lives have been calculated at different maximum stresses using maximum likelihood method. The number of runout specimens as well as the median lives increase rapidly with decreasing maximum bending stress. Statistical analysis has been applied to obtain the fatigue exponents of the two materials. Comparison has been made on the fatigue strength of the HPSN, sintered Si3N4 and hard bearing steels. Some fractographic examinations have been made which show material flaws play an important role in failure initiation.