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

Abstract

Here, 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 Lab. (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. doi: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. doi: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 = {Here, 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 = {2018},
month = {6}
}

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Works referenced in this record:

Evaluation of the sintering regime on the mechanical and physical properties of the NiO – YSZ anode support tubes
journal, October 2017

  • Soydan, Ali Murat; Akduman, Osman Yagiz; Durgun, Abdullatif
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Strength characterization of tubular ceramic materials by flexure of semi-cylindrical specimens
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Material Selection for Ceramic Gun Tube Liner
journal, September 2006

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Weibull Effective Volumes and Surfaces for Cylindrical Rods Loaded in Flexure
journal, March 2003


The mechanical properties of tubular solid oxide fuel cells
journal, December 2003


    Works referencing / citing this record:

    Evaluation of the sintering regime on the mechanical and physical properties of the NiO – YSZ anode support tubes
    journal, October 2017

    • Soydan, Ali Murat; Akduman, Osman Yagiz; Durgun, Abdullatif
    • International Journal of Hydrogen Energy, Vol. 42, Issue 43
    • DOI: 10.1016/j.ijhydene.2017.06.022

    Strength characterization of tubular ceramic materials by flexure of semi-cylindrical specimens
    journal, May 2014


    Material Selection for Ceramic Gun Tube Liner
    journal, September 2006

    • Carter, Robert H.; Underwood, John H.; Swab, Jeffery J.
    • Materials and Manufacturing Processes, Vol. 21, Issue 6
    • DOI: 10.1080/10426910600602879

    Weibull Effective Volumes and Surfaces for Cylindrical Rods Loaded in Flexure
    journal, March 2003


    Failure Stress and Apparent Elastic Modulus of Diesel Particulate Filter Ceramics
    journal, April 2012

    • Wereszczak, Andrew; Fox, Ethan; Lance, Michael
    • SAE International Journal of Materials and Manufacturing, Vol. 5, Issue 2
    • DOI: 10.4271/2012-01-1252