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Title: Threshold angle and valid fracture of the sectored flexural specimen

Abstract

Abstract The sectored flexural specimen was developed over a decade ago to measure the strength of ceramic and glass tubes and cylinders in which flaws on a tube's or cylinder's outer surface are limiters of axial tensile failure stress. Using the specimen's geometry, the associated axial tensile failure stress can be analytically calculated from the failure force measured from simple uniaxial bending, and multiple specimens (and test data) can be harvested from a single tube or cylinder. The sector angles of specimens in previous studies were somewhat arbitrarily chosen and usually produced validly occurring fractures and data; however, if the angle used was too small (relative to the tube's or cylinder's geometry), then undesirable application‐irrelevant edge‐located failures resulted. To avoid such failures in specimen design, a threshold sector angle was identified to guide the selection of a minimum sector angle (and consequential cross section) for any arbitrary sector flexural specimen harvested from a tube or cylinder. If the sector angle of the specimen is larger than the threshold value, then fracture will not occur at a specimen's edge and the measured axial failure stress will be limited by surface‐located flaws on the tube's or cylinder's outer surface.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3]
  1. Oak Ridge Associated Univ., Oak Ridge, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of North Florida, Jacksonville, FL (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1485006
Alternate Identifier(s):
OSTI ID: 1460419
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Applied Ceramic Technology
Additional Journal Information:
Journal Volume: 16; Journal Issue: 1; Journal ID: ISSN 1546-542X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; brittle materials; failure; strength

Citation Formats

Oistad, Brian A., Wereszczak, Andrew A., Chen, Branndon R., and Jadaan, Osama M. Threshold angle and valid fracture of the sectored flexural specimen. United States: N. p., 2018. Web. doi:10.1111/ijac.13055.
Oistad, Brian A., Wereszczak, Andrew A., Chen, Branndon R., & Jadaan, Osama M. Threshold angle and valid fracture of the sectored flexural specimen. United States. https://doi.org/10.1111/ijac.13055
Oistad, Brian A., Wereszczak, Andrew A., Chen, Branndon R., and Jadaan, Osama M. Sat . "Threshold angle and valid fracture of the sectored flexural specimen". United States. https://doi.org/10.1111/ijac.13055. https://www.osti.gov/servlets/purl/1485006.
@article{osti_1485006,
title = {Threshold angle and valid fracture of the sectored flexural specimen},
author = {Oistad, Brian A. and Wereszczak, Andrew A. and Chen, Branndon R. and Jadaan, Osama M.},
abstractNote = {Abstract The sectored flexural specimen was developed over a decade ago to measure the strength of ceramic and glass tubes and cylinders in which flaws on a tube's or cylinder's outer surface are limiters of axial tensile failure stress. Using the specimen's geometry, the associated axial tensile failure stress can be analytically calculated from the failure force measured from simple uniaxial bending, and multiple specimens (and test data) can be harvested from a single tube or cylinder. The sector angles of specimens in previous studies were somewhat arbitrarily chosen and usually produced validly occurring fractures and data; however, if the angle used was too small (relative to the tube's or cylinder's geometry), then undesirable application‐irrelevant edge‐located failures resulted. To avoid such failures in specimen design, a threshold sector angle was identified to guide the selection of a minimum sector angle (and consequential cross section) for any arbitrary sector flexural specimen harvested from a tube or cylinder. If the sector angle of the specimen is larger than the threshold value, then fracture will not occur at a specimen's edge and the measured axial failure stress will be limited by surface‐located flaws on the tube's or cylinder's outer surface.},
doi = {10.1111/ijac.13055},
journal = {International Journal of Applied Ceramic Technology},
number = 1,
volume = 16,
place = {United States},
year = {Sat Jun 30 00:00:00 EDT 2018},
month = {Sat Jun 30 00:00:00 EDT 2018}
}

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