Chapter 27. Strength of AC-Sphere Flexure Specimen

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. A. A. Wereszczak1,
  2. W. Wang2,
  3. O. M. Jadaan3,
  4. M. J. Lance4 and
  5. H.-T. Lin4

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch27

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Wereszczak, A. A., Wang, W., Jadaan, O. M., Lance, M. J. and Lin, H.-T. (2006) Strength of AC-Sphere Flexure Specimen, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch27

Author Information

  1. 1

    Ceramic Science and Technology Oak Ridge National Laboratory Oak Ridge, TN 37831

  2. 2

    Bournemouth University Dorset, UK BH12 5BB

  3. 3

    College of Engineering, Mathematics, and Science University of Wisconsin – Platteville Platteville, WI 53818

  4. 4

    Ceramic Science and Technology Oak Ridge National Laboratory Oak Ridge, TN 37831

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • geometry;
  • finite element analysis (FEA);
  • hydrostatic;
  • specimens;
  • ornl

Summary

A “C–Sphere” flexure strength specimen geometry was conceived and developed to measure a relevant strength of bearing–grade Si3N4 balls and to relate that to surface–located strength–limiting flaws and to ultimately link those flaw populations to rolling contact fatigue performance. A slot was machined into the balls to a set depth to produce the C–sphere geometry. C–sphere specimens were then diametrally compressed to produce a monotonically increasing flexure or hoop tensile stress at their surface that caused their fracture. The strength was determined using the combination of failure load, C–sphere geometry, and FEA, and the stress field was used to determine C–sphere effective areas and effective volumes as a function of Weibull modulus. A description of the specimen and the aforementioned analysis are provided and a comparison of C–sphere flexure strength distributions of two bearing grade SijN4 materials (NBD200 and SN101C) is given.