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Title: Tensile fracture behavior of two types of silicon nitride specimen geometries conducted by ten U.S. groups

Abstract

The work reported was conducted to provide a basis for structural ceramic mechanical property standardization activities under way in the US, Germany, Japan, and Sweden. All measurements reported here were conducted by 10 US groups on GN-10 silicon nitride within an International Energy Agency program including the US, Germany, Japan, and Sweden. This cooperative work included tensile strength studies of two geometries of button-head tensile specimens. The authors conducted some of the measurements and performed data analyses and interpretation. The tensile fracture behavior of GN-10 silicon nitride was studied at room temperature. A total of 150 strain-gaged button-head tensile specimens were measured. One hundred of a straight collet design and 50 of a tapered collet design were fractured. All specimens were highly strain gaged and the outputs for each were measured during loading to fracture. Bending moments were calculated. Analysis of the Weibull m and {sigma}{sub {Theta}} estimators at upper and lower confidence bounds of 95% and 5% did not indicate a clear choice between the two designs. For specimens which fractured in the gage section, the unbiased maximum likelihood Weibull estimators for m and {sigma}{sub {Theta}} were 12.5 and 730 and 10.4 and 716, for the straight and taperedmore » collet configurations, respectively. These are not statistically different at the 95% and 5% confidence levels. Strengths were also analyzed in terms of a three-parameter Weibull model. The straight collet specimen data fitted the three parameter model well with a threshold stress estimator {gamma} of 506 MPa, while the tapered collet specimens provided a poorer fit to the model and had a threshold stress estimator of 432 MPa, a difference of about 15%.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
OSTI Identifier:
20075976
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TENSILE PROPERTIES; SILICON NITRIDES; STRAIN GAGES; DATA COMPILATION; DATA ANALYSIS; STATISTICAL DATA

Citation Formats

Tennery, V.J., Breder, K., Ferber, M.K., and Jenkins, M.G. Tensile fracture behavior of two types of silicon nitride specimen geometries conducted by ten U.S. groups. United States: N. p., 2000. Web. doi:10.1111/j.1151-2916.2000.tb01352.x.
Tennery, V.J., Breder, K., Ferber, M.K., & Jenkins, M.G. Tensile fracture behavior of two types of silicon nitride specimen geometries conducted by ten U.S. groups. United States. doi:10.1111/j.1151-2916.2000.tb01352.x.
Tennery, V.J., Breder, K., Ferber, M.K., and Jenkins, M.G. Mon . "Tensile fracture behavior of two types of silicon nitride specimen geometries conducted by ten U.S. groups". United States. doi:10.1111/j.1151-2916.2000.tb01352.x.
@article{osti_20075976,
title = {Tensile fracture behavior of two types of silicon nitride specimen geometries conducted by ten U.S. groups},
author = {Tennery, V.J. and Breder, K. and Ferber, M.K. and Jenkins, M.G.},
abstractNote = {The work reported was conducted to provide a basis for structural ceramic mechanical property standardization activities under way in the US, Germany, Japan, and Sweden. All measurements reported here were conducted by 10 US groups on GN-10 silicon nitride within an International Energy Agency program including the US, Germany, Japan, and Sweden. This cooperative work included tensile strength studies of two geometries of button-head tensile specimens. The authors conducted some of the measurements and performed data analyses and interpretation. The tensile fracture behavior of GN-10 silicon nitride was studied at room temperature. A total of 150 strain-gaged button-head tensile specimens were measured. One hundred of a straight collet design and 50 of a tapered collet design were fractured. All specimens were highly strain gaged and the outputs for each were measured during loading to fracture. Bending moments were calculated. Analysis of the Weibull m and {sigma}{sub {Theta}} estimators at upper and lower confidence bounds of 95% and 5% did not indicate a clear choice between the two designs. For specimens which fractured in the gage section, the unbiased maximum likelihood Weibull estimators for m and {sigma}{sub {Theta}} were 12.5 and 730 and 10.4 and 716, for the straight and tapered collet configurations, respectively. These are not statistically different at the 95% and 5% confidence levels. Strengths were also analyzed in terms of a three-parameter Weibull model. The straight collet specimen data fitted the three parameter model well with a threshold stress estimator {gamma} of 506 MPa, while the tapered collet specimens provided a poorer fit to the model and had a threshold stress estimator of 432 MPa, a difference of about 15%.},
doi = {10.1111/j.1151-2916.2000.tb01352.x},
journal = {Journal of the American Ceramic Society},
issn = {0002-7820},
number = 5,
volume = 83,
place = {United States},
year = {2000},
month = {5}
}