Sr. Choi et Jp. Gyekenyesi, Slow crack growth analysis of advanced structural ceramics under combined loading conditions: Damage assessment in life prediction testing, J ENG GAS T, 123(2), 2001, pp. 277-287
Citations number
18
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
Slow crack growth analysis was performed with three different loading histo
ries including constant stress-rate/constant stress-rate testing (Case I lo
ading), constant stress/constant stress-rate testing (Case II loading), and
cyclic stress/constant stress-rate testing (Case III loading). Strength de
gradation due to slow crack growth and/or damage accumulation was determine
d 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 temperature
s using Sour different advanced ceramic materials, two silicon nitrides, on
e silicon carbide and one alumina for the Case I loading history, and alumi
na for the Case II loading history. The numerical solutions were in reasona
ble agreement with the experimental data, indicating that notwithstanding s
ome degree of deep deformation presented for some test materials slow crack
growth was a governing mechanism associated with failure Sor all the test
materials.