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Titolo:
Elevated-temperature "ultra" fast fracture strength of advanced ceramics: An approach to elevated temperature "inert" strength
Autore:
Choi, SR; Gyekenyesi, JP;
Indirizzi:
Cleveland State Univ, Cleveland, OH 44115 USA Cleveland State Univ Cleveland OH USA 44115 Univ, Cleveland, OH 44115 USA NASA, Lewis Res Ctr, Cleveland, OH 44135 USA NASA Cleveland OH USA 44135NASA, Lewis Res Ctr, Cleveland, OH 44135 USA
Titolo Testata:
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
fascicolo: 1, volume: 121, anno: 1999,
pagine: 18 - 24
SICI:
0742-4795(199901)121:1<18:E"FFSO>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOT-PRESSED SI3N4; SILICON-NITRIDE; CRACK-PROPAGATION; FATIGUE BEHAVIOR; GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Choi, SR Cleveland State Univ, Cleveland, OH 44115 USA Cleveland State Univ Cleveland OH USA 44115 veland, OH 44115 USA
Citazione:
S.R. Choi e J.P. Gyekenyesi, "Elevated-temperature "ultra" fast fracture strength of advanced ceramics: An approach to elevated temperature "inert" strength", J ENG GAS T, 121(1), 1999, pp. 18-24

Abstract

The determination of "ultra" fast fracture strengths of five silicon nitride ceramics at elevated temperatures has been made by using constant stress-rate ("dynamic fatigue") testing with a series of "ultra" fast test rates. The test materials included four monolithic and one SiC whisker-reinforcedcomposite silicon nitrides. Of the five test materials, four silicon nitrides exhibited the elevated-temperature strengths that approached their respective room-temperature strengths at an "ultra" fast test rate of 3.3 x 10(4) MPa/s. This implies that slow crack growth responsible for elevated-temperature failure can be eliminated or minimized by using the "ultra" fast test rate. These ongoing experimental results have shed light on laying a theoretical and practical foundation on the concept and definition of elevated-temperature "inert" strength behavior of advanced ceramics.

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Documento generato il 14/07/20 alle ore 06:41:12