Determination of tensile and compressive creep behaviour of ceramic materials from bend tests

Four-point bend test measurements on trapezoidal bars, together with equations for the general stress dependence case, are employed to determine the individual compressive and tensile creep rates of hot-pressed Si3N4 specimens. The general stress dependence equations are developed from the governing...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 1978-03, Vol.13 (3), p.580-586
Main Authors: Talty, Patrick K., Dirks, Richard A.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Four-point bend test measurements on trapezoidal bars, together with equations for the general stress dependence case, are employed to determine the individual compressive and tensile creep rates of hot-pressed Si3N4 specimens. The general stress dependence equations are developed from the governing equations for the case of a linear dependence of creep rate on stress, as discussed by Finnie (1966). The ratio of compressive to tensile creep for previously unstrained specimens averages 0.18; the value for prestrained specimens is 0.48. An analysis based on four-point bend testing of rectangular bars corroborates the conclusions of the trapezoidal bar tests.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00541808