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Effects of mixed mode loading on fatigue and creep–fatigue in SRR-99 single crystals

Reed, P.A.S., Tucker, P.H. and Joyce, M.R. (2005) Effects of mixed mode loading on fatigue and creep–fatigue in SRR-99 single crystals Materials Science and Engineering: A, 394, (1-2), pp. 256-265. (doi:10.1016/j.msea.2004.11.028).

Record type: Article


Fatigue tests have been carried out at 20, 650 and 850 °C over a range of frequencies on SRR-99 single crystals under both pure mode I and mixed mode I/II loading conditions in vacuum at a stress-ratio of 0.5. At low temperatures, predominantly slip band crack growth (which remained effectively in-plane) was observed, although the scale of the facets increased under mixed mode loading. At high temperatures mixed mode loading resulted in deflected co-operative slip crack growth along a direction that experienced the maximum opening mode (analogous to Stage II crack growth). Some pore cavitation and interlinking was observed at the highest temperatures and lowest frequencies. The effect of increased dwell time at 850 °C was to increase crack growth rates compared with the highest frequency test, although differences in the magnitude of these effects were seen for the two different loading conditions. The increased constraint experienced by the deflected crack offers a partial explanation for this.

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Published date: 2005
Keywords: mixed mode loading, high temperature fatigue, single crystal, srr 99, frequency effects
Organisations: Engineering Sciences


Local EPrints ID: 23178
ISSN: 0921-5093
PURE UUID: 0e1e4d97-0bdb-45f3-90a4-0facc2d26b1b
ORCID for P.A.S. Reed: ORCID iD

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Date deposited: 15 Mar 2006
Last modified: 17 Jul 2017 16:19

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Author: P.A.S. Reed ORCID iD
Author: P.H. Tucker
Author: M.R. Joyce

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