Effect of cyclic loading on the creep performance of silicon nitride

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Tension-tension cyclic fatigue tests (triangular waveform, {sigma}{sub max} = 100 MPa, R = 0.1) were conducted on hot isostatically pressed (HIPed) silicon nitride at frequencies spanning several orders of magnitude (5.6 {times} 10{sup {minus}6} to 0.1 Hz or 10{sup {minus}3} MPa/s to 18 MPa/s) at 1,370 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 ... continued below

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8 p.

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Wereszczak, A.A.; Ferber, M.K.; Kirkland, T.P. & Lin, C.K.J. April 1, 1995.

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Description

Tension-tension cyclic fatigue tests (triangular waveform, {sigma}{sub max} = 100 MPa, R = 0.1) were conducted on hot isostatically pressed (HIPed) silicon nitride at frequencies spanning several orders of magnitude (5.6 {times} 10{sup {minus}6} to 0.1 Hz or 10{sup {minus}3} MPa/s to 18 MPa/s) at 1,370 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.

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8 p.

Notes

OSTI as DE95010289

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  • 40. International gas turbine and aeroengine congress and exposition, Houston, TX (United States), 5-8 Jun 1995

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  • Other: DE95010289
  • Report No.: CONF-950629--6
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/52850 | External Link
  • Office of Scientific & Technical Information Report Number: 52850
  • Archival Resource Key: ark:/67531/metadc691504

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  • April 1, 1995

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 19, 2016, 12:55 p.m.

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Wereszczak, A.A.; Ferber, M.K.; Kirkland, T.P. & Lin, C.K.J. Effect of cyclic loading on the creep performance of silicon nitride, report, April 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc691504/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.