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- W30401097 abstract "Creep crack growth in an SiC whisker-reinforced Si{sub 3}N{sub 4} composite was studied at 1370 C in air. Indentation cracks on tensile surface of four-point bend specimens were monitored by periodic interruption of the creep test up to 0.84 percent creep strain. The growth rate of individual cracks was found to fluctuate with time resulting in relatively large scatter among the velocities of the different cracks placed on the tensile surface. This fluctuation was apparently caused by intermittent breaking of crack bridging ligaments that were formed by the nucleation of microcracks ahead of the main crack. On the average, the crack growth rate was only slightly sensitive to the apparent stress intensity factor, with a velocity exponent of 1.9, but showed a strong linear correlation with the measured creep strain rate. The relationship between velocity and creep strain rate could be of considerable importance in predicting component life made of this composite. 9 refs." @default.
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- W30401097 date "1989-10-01" @default.
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- W30401097 title "Creep crack growth in SiC whisker-reinforced Si sub 3 N sub 4" @default.
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