skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.

Abstract

To establish mechanical properties and failure criteria of silicon carbide (SiC-N) ceramics, a series of quasi-static compression tests has been completed using a high-pressure vessel and a unique sample alignment jig. This report summarizes the test methods, set-up, relevant observations, and results from the constitutive experimental efforts. Results from the uniaxial and triaxial compression tests established the failure threshold for the SiC-N ceramics in terms of stress invariants (I{sub 1} and J{sub 2}) over the range 1246 < I{sub 1} < 2405. In this range, results are fitted to the following limit function (Fossum and Brannon, 2004) {radical}J{sub 2}(MPa) = a{sub 1} - a{sub 3}e -a{sub 2}(I{sub 1}/3) + a{sub 4} I{sub 1}/3, where a{sub 1} = 10181 MPa, a{sub 2} = 4.2 x 10{sup -4}, a{sub 3} = 11372 MPa, and a{sub 4} = 1.046. Combining these quasistatic triaxial compression strength measurements with existing data at higher pressures naturally results in different values for the least-squares fit to this function, appropriate over a broader pressure range. These triaxial compression tests are significant because they constitute the first successful measurements of SiC-N compressive strength under quasistatic conditions. Having an unconfined compressive strength of {approx}3800 MPa, SiC-N has been heretofore testedmore » only under dynamic conditions to achieve a sufficiently large load to induce failure. Obtaining reliable quasi-static strength measurements has required design of a special alignment jig and load-spreader assembly, as well as redundant gages to ensure alignment. When considered in combination with existing dynamic strength measurements, these data significantly advance the characterization of pressure-dependence of strength, which is important for penetration simulations where failed regions are often at lower pressures than intact regions.« less

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
920770
Report Number(s):
SAND2004-6005
TRN: US200803%%22
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; COMPRESSION STRENGTH; PRESSURE DEPENDENCE; SILICON CARBIDES; STATIC LOADS; MECHANICAL TESTS; SILICON NITRIDES; Ceramics.; Silicon carbide.; Materials-Mechanical properties-Mathematical models.

Citation Formats

Brannon, Rebecca Moss, Lee, Moo Yul, and Bronowski, David R. Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.. United States: N. p., 2005. Web. doi:10.2172/920770.
Brannon, Rebecca Moss, Lee, Moo Yul, & Bronowski, David R. Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.. United States. https://doi.org/10.2172/920770
Brannon, Rebecca Moss, Lee, Moo Yul, and Bronowski, David R. 2005. "Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.". United States. https://doi.org/10.2172/920770. https://www.osti.gov/servlets/purl/920770.
@article{osti_920770,
title = {Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.},
author = {Brannon, Rebecca Moss and Lee, Moo Yul and Bronowski, David R},
abstractNote = {To establish mechanical properties and failure criteria of silicon carbide (SiC-N) ceramics, a series of quasi-static compression tests has been completed using a high-pressure vessel and a unique sample alignment jig. This report summarizes the test methods, set-up, relevant observations, and results from the constitutive experimental efforts. Results from the uniaxial and triaxial compression tests established the failure threshold for the SiC-N ceramics in terms of stress invariants (I{sub 1} and J{sub 2}) over the range 1246 < I{sub 1} < 2405. In this range, results are fitted to the following limit function (Fossum and Brannon, 2004) {radical}J{sub 2}(MPa) = a{sub 1} - a{sub 3}e -a{sub 2}(I{sub 1}/3) + a{sub 4} I{sub 1}/3, where a{sub 1} = 10181 MPa, a{sub 2} = 4.2 x 10{sup -4}, a{sub 3} = 11372 MPa, and a{sub 4} = 1.046. Combining these quasistatic triaxial compression strength measurements with existing data at higher pressures naturally results in different values for the least-squares fit to this function, appropriate over a broader pressure range. These triaxial compression tests are significant because they constitute the first successful measurements of SiC-N compressive strength under quasistatic conditions. Having an unconfined compressive strength of {approx}3800 MPa, SiC-N has been heretofore tested only under dynamic conditions to achieve a sufficiently large load to induce failure. Obtaining reliable quasi-static strength measurements has required design of a special alignment jig and load-spreader assembly, as well as redundant gages to ensure alignment. When considered in combination with existing dynamic strength measurements, these data significantly advance the characterization of pressure-dependence of strength, which is important for penetration simulations where failed regions are often at lower pressures than intact regions.},
doi = {10.2172/920770},
url = {https://www.osti.gov/biblio/920770}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {2}
}