Effect of cyclic loading on the creep performance of silicon nitride

Andrew A. Wereszczak, Mattison K. Ferber, Timothy P. Kirkland, Chih Kuang J. Lin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Tension-tension cyclic fatigue tests (triangular waveform, σmax = 100 MPa, R = 0.1) were conducted on hot isostatically pressed (HIPed) silicon nitride at frequencies spanning several orders of magnitude (5.6×10-6 to 0.1 Hz or 10-3 MPa/s to 18 MPa/s) at 1370°C in air. The amount of cyclic creep strain was found to be a function of the frequency or stressing rate with greater strains to failure observed as the frequency or stressing rate decreased. The total strain was viewed as the sum of elastic, anelastic (or transient recoverable), and plastic (viscous or non-recoverable) strain contributions, after the empirical Pao and Marin model. The plastic strain was found to be the dominant component of the total creep and was unsatisfactorily represented by the Pao and Marin model. To circumvent this, a time exponent was introduced in the plastic strain term in the Pao and Marin model. This modification resulted in good correlation between model and experiment at the slower frequencies examined but over-predicted the cyclic creep strain at the faster frequencies. The utility of using the modified Pao and Marin model to predict cyclic creep response from static creep and strain relaxation tests is described.

Original languageEnglish
Title of host publicationManufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791878828
DOIs
StatePublished - 1995
EventASME 1995 International Gas Turbine and Aeroengine Congress and Exposition, GT 1995 - Houston, United States
Duration: 5 Jun 19958 Jun 1995

Publication series

NameProceedings of the ASME Turbo Expo
Volume5

Conference

ConferenceASME 1995 International Gas Turbine and Aeroengine Congress and Exposition, GT 1995
Country/TerritoryUnited States
CityHouston
Period5/06/958/06/95

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