Abstract
Residual stresses in Si{sub 3}N{sub 4} and SiC have been measured with X-ray diffraction after grinding and thermal shock. The produced surface stresses are compressive after both treatments. The stresses show a strong dependence on the quenching temperature up to a certain temperature when cracks relax the stresses. The influence of the amount of reinforcing phase on the residual stress state in a Al{sub 2}O{sub 3}/SiC whisker composite was investigated and correlated to a modified Eshelby model. The agreement is excellent. The composite was quenched in liquid He (4K) and the stress state measured after show no relaxation of stresses, indicating elastic behaviour. An in situ strain measurement as a function of temperature conducted on a Al{sub 2}O{sub 3}/SiC whisker composite and a SiC/TiB{sub 2} particle composite show very good agreement with the Eshelby model for the Al{sub 2}O{sub 3}/SiC system but not agreement for the SiC/TiB{sub 2} system. The reason is believed to be stress relaxation during sample preparation. (au) (53 refs., 24 figs., 14 tabs.).
Citation Formats
Oden, M.
Residual stress in ceramics and ceramic composites.
Sweden: N. p.,
1992.
Web.
Oden, M.
Residual stress in ceramics and ceramic composites.
Sweden.
Oden, M.
1992.
"Residual stress in ceramics and ceramic composites."
Sweden.
@misc{etde_10127694,
title = {Residual stress in ceramics and ceramic composites}
author = {Oden, M}
abstractNote = {Residual stresses in Si{sub 3}N{sub 4} and SiC have been measured with X-ray diffraction after grinding and thermal shock. The produced surface stresses are compressive after both treatments. The stresses show a strong dependence on the quenching temperature up to a certain temperature when cracks relax the stresses. The influence of the amount of reinforcing phase on the residual stress state in a Al{sub 2}O{sub 3}/SiC whisker composite was investigated and correlated to a modified Eshelby model. The agreement is excellent. The composite was quenched in liquid He (4K) and the stress state measured after show no relaxation of stresses, indicating elastic behaviour. An in situ strain measurement as a function of temperature conducted on a Al{sub 2}O{sub 3}/SiC whisker composite and a SiC/TiB{sub 2} particle composite show very good agreement with the Eshelby model for the Al{sub 2}O{sub 3}/SiC system but not agreement for the SiC/TiB{sub 2} system. The reason is believed to be stress relaxation during sample preparation. (au) (53 refs., 24 figs., 14 tabs.).}
issue = {(no.329)}
place = {Sweden}
year = {1992}
month = {Oct}
}
title = {Residual stress in ceramics and ceramic composites}
author = {Oden, M}
abstractNote = {Residual stresses in Si{sub 3}N{sub 4} and SiC have been measured with X-ray diffraction after grinding and thermal shock. The produced surface stresses are compressive after both treatments. The stresses show a strong dependence on the quenching temperature up to a certain temperature when cracks relax the stresses. The influence of the amount of reinforcing phase on the residual stress state in a Al{sub 2}O{sub 3}/SiC whisker composite was investigated and correlated to a modified Eshelby model. The agreement is excellent. The composite was quenched in liquid He (4K) and the stress state measured after show no relaxation of stresses, indicating elastic behaviour. An in situ strain measurement as a function of temperature conducted on a Al{sub 2}O{sub 3}/SiC whisker composite and a SiC/TiB{sub 2} particle composite show very good agreement with the Eshelby model for the Al{sub 2}O{sub 3}/SiC system but not agreement for the SiC/TiB{sub 2} system. The reason is believed to be stress relaxation during sample preparation. (au) (53 refs., 24 figs., 14 tabs.).}
issue = {(no.329)}
place = {Sweden}
year = {1992}
month = {Oct}
}