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Title: STRENGTH OF A C-SPHERE FLEXURE SPECIMEN

Abstract

A 'C-Sphere' flexure strength specimen geometry was conceived and developed to measure a relevant strength of bearing-grade Si{sub 3}N{sub 4} 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 Si{sub 3}N{sub 4} materials (NBD200 and SN101C) is given.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. ORNL
  2. University of Wisconsin, Platteville
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
931246
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 30th International Conference and Exposition on Advanced Ceramics and Composites, Cocoa Beach, FL, USA, 20060122, 20060127
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; BALL BEARINGS; FLEXURAL STRENGTH; DESTRUCTIVE TESTING; DEFECTS; PERFORMANCE; FINITE ELEMENT METHOD

Citation Formats

Wereszczak, Andrew A, Wang, Wei, Jadaan, Osama M., Lance, Michael J, and Lin, Hua-Tay. STRENGTH OF A C-SPHERE FLEXURE SPECIMEN. United States: N. p., 2007. Web.
Wereszczak, Andrew A, Wang, Wei, Jadaan, Osama M., Lance, Michael J, & Lin, Hua-Tay. STRENGTH OF A C-SPHERE FLEXURE SPECIMEN. United States.
Wereszczak, Andrew A, Wang, Wei, Jadaan, Osama M., Lance, Michael J, and Lin, Hua-Tay. Mon . "STRENGTH OF A C-SPHERE FLEXURE SPECIMEN". United States. doi:.
@article{osti_931246,
title = {STRENGTH OF A C-SPHERE FLEXURE SPECIMEN},
author = {Wereszczak, Andrew A and Wang, Wei and Jadaan, Osama M. and Lance, Michael J and Lin, Hua-Tay},
abstractNote = {A 'C-Sphere' flexure strength specimen geometry was conceived and developed to measure a relevant strength of bearing-grade Si{sub 3}N{sub 4} 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 Si{sub 3}N{sub 4} materials (NBD200 and SN101C) is given.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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