Strength of a ceramic sectored flexural test specimen

A. A. Wereszczak; S. F. Duffy; E. H. Baker; J. J. Swab; G. J. Champoux

Strength of a ceramic sectored flexural test specimen

A. A. Wereszczak, S. F. Duffy, E. H. Baker, J. J. Swab, G. J. Champoux

Mechanical Properties and Mechanics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

A new test specimen, defined here as the "sectored flexural strength test specimen," was developed to measure the strength of ceramic tubes specifically for circumstances when flaws located at the tube's outer diameter are the strength-limiter when subjected to axial tension. The understanding of such strength-limitation is relevant when ceramic tubes are subjected to bending or when the internal temperature is hotter than the tube's exterior (e.g., heat exchangers). The test specimen is both economically and statistically attractive because eight test specimens (eight in the case of this project-but the user is not necessarily limited to eight) were extracted out of each length of tube. An analytic expression for maximum (or failure) stress, and relationships portraying effective area and effective volume as a function of Weibull modulus were developed. Lastly, it was shown through the testing of two ceramics that the sectored flexural specimen was very effective; it produced failures caused by strength-limiting flaws located on the tube's original outer diameter.

Original language	English
Pages (from-to)	17-23
Number of pages	7
Journal	Journal of Testing and Evaluation
Volume	36
Issue number	1
State	Published - Jan 2008

Funding

The authors wish to express their gratitude to Steve Goodrich of the University of Dayton Research Institute for the strength testing and H. -T. Lin of Oak Ridge National Laboratory for his assistance with the scanning electron microscopy. C.-H. Hsueh and A. Shyam of Oak Ridge National Laboratory are thanked for their useful comments and suggestions. Research sponsored by the U.S. Army Research Laboratory’s Ceramic Gun Barrel STO and the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the Heavy Vehicle Propulsion System Materials Program, and WFO Sponsor U.S. Army Research Laboratory, both under Contract DE-AC05-00OR22725 with UT-Battelle.

Funders	Funder number
Office of Transportation Technologies
WFO Sponsor U.S. Army Research Laboratory	DE-AC05-00OR22725
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Army Research Laboratory

Keywords

Ceramics
Effective area
Effective volume
Finite-element analysis
Fractography
Sectored flexural specimen
Strength
Weibull distribution

Cite this

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AU - Duffy, S. F.

AU - Baker, E. H.

AU - Swab, J. J.

AU - Champoux, G. J.

PY - 2008/1

Y1 - 2008/1

N2 - A new test specimen, defined here as the "sectored flexural strength test specimen," was developed to measure the strength of ceramic tubes specifically for circumstances when flaws located at the tube's outer diameter are the strength-limiter when subjected to axial tension. The understanding of such strength-limitation is relevant when ceramic tubes are subjected to bending or when the internal temperature is hotter than the tube's exterior (e.g., heat exchangers). The test specimen is both economically and statistically attractive because eight test specimens (eight in the case of this project-but the user is not necessarily limited to eight) were extracted out of each length of tube. An analytic expression for maximum (or failure) stress, and relationships portraying effective area and effective volume as a function of Weibull modulus were developed. Lastly, it was shown through the testing of two ceramics that the sectored flexural specimen was very effective; it produced failures caused by strength-limiting flaws located on the tube's original outer diameter.

AB - A new test specimen, defined here as the "sectored flexural strength test specimen," was developed to measure the strength of ceramic tubes specifically for circumstances when flaws located at the tube's outer diameter are the strength-limiter when subjected to axial tension. The understanding of such strength-limitation is relevant when ceramic tubes are subjected to bending or when the internal temperature is hotter than the tube's exterior (e.g., heat exchangers). The test specimen is both economically and statistically attractive because eight test specimens (eight in the case of this project-but the user is not necessarily limited to eight) were extracted out of each length of tube. An analytic expression for maximum (or failure) stress, and relationships portraying effective area and effective volume as a function of Weibull modulus were developed. Lastly, it was shown through the testing of two ceramics that the sectored flexural specimen was very effective; it produced failures caused by strength-limiting flaws located on the tube's original outer diameter.

KW - Ceramics

KW - Effective area

KW - Effective volume

KW - Finite-element analysis

KW - Fractography

KW - Sectored flexural specimen

KW - Strength

KW - Weibull distribution

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JO - Journal of Testing and Evaluation

JF - Journal of Testing and Evaluation

IS - 1

ER -

Strength of a ceramic sectored flexural test specimen

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Funding

Keywords

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