ABSTRACT
Slow crack growth a,-udysis was ped'onned with tJ_ee different
loading histories including constant s_'css-mteJconstant slress-ratc
testing (Case I loading), constant skess/constant stress-rate testing
(Case II loading), and cyclic stress/constant stress-rate testing (Case ITI
loading_ Strength degradation due to slow crack growth and/or
damage accumulation was determined numerically as a function of
percentage of interruption time between the two loading sequences for
a given loading history. The numerical solutions were examined with
the experimental data determined at elevated temperatures using four
different advanced ceramic materials, two silicon nitrides, one silicon
carbide and one alumina for the Case I loading history, and alumina for
the Case H loading history. The numerical solutions were in reasonable
agreement with the experimental data, indicafin 8 that notwithstandin 8
some degree of creep deformation presented for some test materials
slow crack growth was a governing mechanism associated with failure
for all the test materials.
ABSTRACT
Slow crack growth a,-udysis was ped'onned with tJ_ee different
loading histories including constant s_'css-mteJconstant slress-ratc
testing (Case I loading), constant skess/constant stress-rate testing
(Case II loading), and cyclic stress/constant stress-rate testing (Case ITI
loading_ Strength degradation due to slow crack growth and/or
damage accumulation was determined numerically as a function of
percentage of interruption time between the two loading sequences for
a given loading history. The numerical solutions were examined with
the experimental data determined at elevated temperatures using four
different advanced ceramic materials, two silicon nitrides, one silicon
carbide and one alumina for the Case I loading history, and alumina for
the Case H loading history. The numerical solutions were in reasonable
agreement with the experimental data, indicafin 8 that notwithstandin 8
some degree of creep deformation presented for some test materials
slow crack growth was a governing mechanism associated with failure
for all the test materials.
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