Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy

J. F. McCARVER; R. O. RITCHIE

doi:10.1016/0025-5416(82)90084-2

Author(s)

J. F. McCARVER
R. O. RITCHIE

Detail(s)

Original language	English
Pages (from-to)	63-67
Journal / Publication	Materials Science and Engineering
Volume	55
Issue number	1
Publication status	Published - Aug 1982
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/0025-5416(82)90084-2 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-0008916524&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(d8b2a6c9-2c53-4952-ad22-4d84c1e25a09).html

Abstract

A study was made of the near-threshold fatigue crack propagation behaviour of a wrought nickel-base superalloy, René 95, with reference to the effect of crack size on the threshold stress intensity ΔK₀ no detectable crack growth. Measured threshold ΔK₀ values at low load ratios (R = 0.1) for physically short (0.01 - 0.20 mm) cracks were found to be 60% smaller than the corresponding ΔK₀ values for long (about 25 mm) cracks. However, short crack threshold values at R = 0.1 were found to be similar to long crack thresholds at R = 0.8. Such behavior is rationalized in terms of fatigue crack closure, specifically involving the role of fracture surface roughness from crystallographic crack growth in nickel-base alloys. The large difference observed between the threshold values for long and physically short cracks serves to illustrate the potential problems in applying conventional (long crack) fatigue data to defect-tolerant lifetime predictions for structural components containing small flaws.

Citation Format(s)

[ RIS ] [ BibTeX ]

Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy. / McCARVER, J. F.; RITCHIE, R. O.
In: Materials Science and Engineering, Vol. 55, No. 1, 08.1982, p. 63-67.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

McCARVER, JF & RITCHIE, RO 1982, 'Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy', Materials Science and Engineering, vol. 55, no. 1, pp. 63-67. https://doi.org/10.1016/0025-5416(82)90084-2

McCARVER, J. F., & RITCHIE, R. O. (1982). Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy. Materials Science and Engineering, 55(1), 63-67. https://doi.org/10.1016/0025-5416(82)90084-2

McCARVER JF, RITCHIE RO. Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy. Materials Science and Engineering. 1982 Aug;55(1):63-67. doi: 10.1016/0025-5416(82)90084-2

McCARVER, J. F. ; RITCHIE, R. O. / Fatigue Crack Propagation Thresholds for Long and Short Cracks in René 95 Nickel-base Superalloy. In: Materials Science and Engineering. 1982 ; Vol. 55, No. 1. pp. 63-67.