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Title: Size-Scaling of Tensile Failure Stress in a Hot-Pressed Silicon Carbide

Abstract

Quasi-static Weibull strength-size scaling of hot-pressed silicon carbide is described. Two surface conditions (uniaxial ground and uniaxial ground followed by grit blasting) were explored. Strength test coupons sampled effective areas from the very small (4 x 10{sup -3} mm{sup 2}) to the very large (4 x 10{sup 4} mm{sup 2}). Equibiaxial flexure and Hertzian ring crack initiation were used for the strength tests, and characteristic strengths for several different specimen geometries were analyzed as a function of effective area. Characteristic strength was found to substantially increase with decreased effective area for both surface conditions. Weibull moduli of 9.4- and 11.7 well-represented strength-size scaling for the two ground conditions between an effective area range of 10{sup -1} and 4 x 10{sup 4} mm{sup 2}. Machining damage was observed to be the dominant flaw type over this range. However, for effective areas <10{sup -1} mm{sup 2}, the characteristic strength increased rapidly for both ground surface conditions as the effective area decreased, and one or more of the inherent assumptions behind the classical Weibull strength-size scaling were in violation in this range. The selections of a ceramic strength to account for ballistically induced tile deflection and expanding cavity modeling are considered in contextmore » with the measured strength-size scaling. The observed size-scaling is briefly discussed with reference to dynamic strength.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [2]
  1. ORNL
  2. U.S. Army research Laboratory, Adelphi, MD
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1024225
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
International Journal of Applied Ceramic Technology
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 1546-542X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; DEFECTS; EXPLOSIVE FRACTURING; HOT PRESSING; MACHINING; SILICON CARBIDES; SIMULATION

Citation Formats

Wereszczak, Andrew A, Kirkland, Timothy Philip, Strong, Kevin T, Campbell, James, LaSalvia, Jerry, and Miller, Herbert. Size-Scaling of Tensile Failure Stress in a Hot-Pressed Silicon Carbide. United States: N. p., 2010. Web. doi:10.1111/j.1744-7402.2010.02517.x.
Wereszczak, Andrew A, Kirkland, Timothy Philip, Strong, Kevin T, Campbell, James, LaSalvia, Jerry, & Miller, Herbert. Size-Scaling of Tensile Failure Stress in a Hot-Pressed Silicon Carbide. United States. https://doi.org/10.1111/j.1744-7402.2010.02517.x
Wereszczak, Andrew A, Kirkland, Timothy Philip, Strong, Kevin T, Campbell, James, LaSalvia, Jerry, and Miller, Herbert. 2010. "Size-Scaling of Tensile Failure Stress in a Hot-Pressed Silicon Carbide". United States. https://doi.org/10.1111/j.1744-7402.2010.02517.x.
@article{osti_1024225,
title = {Size-Scaling of Tensile Failure Stress in a Hot-Pressed Silicon Carbide},
author = {Wereszczak, Andrew A and Kirkland, Timothy Philip and Strong, Kevin T and Campbell, James and LaSalvia, Jerry and Miller, Herbert},
abstractNote = {Quasi-static Weibull strength-size scaling of hot-pressed silicon carbide is described. Two surface conditions (uniaxial ground and uniaxial ground followed by grit blasting) were explored. Strength test coupons sampled effective areas from the very small (4 x 10{sup -3} mm{sup 2}) to the very large (4 x 10{sup 4} mm{sup 2}). Equibiaxial flexure and Hertzian ring crack initiation were used for the strength tests, and characteristic strengths for several different specimen geometries were analyzed as a function of effective area. Characteristic strength was found to substantially increase with decreased effective area for both surface conditions. Weibull moduli of 9.4- and 11.7 well-represented strength-size scaling for the two ground conditions between an effective area range of 10{sup -1} and 4 x 10{sup 4} mm{sup 2}. Machining damage was observed to be the dominant flaw type over this range. However, for effective areas <10{sup -1} mm{sup 2}, the characteristic strength increased rapidly for both ground surface conditions as the effective area decreased, and one or more of the inherent assumptions behind the classical Weibull strength-size scaling were in violation in this range. The selections of a ceramic strength to account for ballistically induced tile deflection and expanding cavity modeling are considered in context with the measured strength-size scaling. The observed size-scaling is briefly discussed with reference to dynamic strength.},
doi = {10.1111/j.1744-7402.2010.02517.x},
url = {https://www.osti.gov/biblio/1024225}, journal = {International Journal of Applied Ceramic Technology},
issn = {1546-542X},
number = 5,
volume = 7,
place = {United States},
year = {2010},
month = {1}
}