Creep behavior of Si3N4-whisker-reinforced Si3N4-matrix composites using an in situ dynamic beam profiling method

Célio A. Costa, Judith Todd Copley

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A four-point flexure test, capable of simultaneously measuring load-point and beam-center displacements and permitting in situ profiling of the beam throughout the test, has been developed. Compressive and tensile strains in the outer fibers, together with the neutral axis displacement, were determined in real time for Si3N4-whisker-reinforced Si3N4-ceramic-matrix composites. Combining these data with the closed form solution of Chen and Chuang gave excellent correspondence between the creep exponents determined from flexure tests with those determined independently from tensile and compressive creep tests.

Original languageEnglish (US)
Pages (from-to)607-615
Number of pages9
JournalJournal of the American Ceramic Society
Volume82
Issue number3
StatePublished - 1999

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Creep
Ceramic matrix composites
Tensile strain
Composite materials
Fibers
silicon nitride

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

Cite this

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N2 - A four-point flexure test, capable of simultaneously measuring load-point and beam-center displacements and permitting in situ profiling of the beam throughout the test, has been developed. Compressive and tensile strains in the outer fibers, together with the neutral axis displacement, were determined in real time for Si3N4-whisker-reinforced Si3N4-ceramic-matrix composites. Combining these data with the closed form solution of Chen and Chuang gave excellent correspondence between the creep exponents determined from flexure tests with those determined independently from tensile and compressive creep tests.

AB - A four-point flexure test, capable of simultaneously measuring load-point and beam-center displacements and permitting in situ profiling of the beam throughout the test, has been developed. Compressive and tensile strains in the outer fibers, together with the neutral axis displacement, were determined in real time for Si3N4-whisker-reinforced Si3N4-ceramic-matrix composites. Combining these data with the closed form solution of Chen and Chuang gave excellent correspondence between the creep exponents determined from flexure tests with those determined independently from tensile and compressive creep tests.

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