Digitale Medien
Oxford, UK
:
Blackwell Publishing Ltd
Fatigue & fracture of engineering materials & structures
19 (1996), S. 0
ISSN:
1460-2695
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Maschinenbau
Notizen:
Abstract— Creep-fatigue tests were performed at 650°C in air on a N18 nickel base superalloy, using double notched and smooth specimens. The deformation mechanisms observed by TEM at the notch root are shown to be compatible with the constitutive set of equations used in the finite element analysis which is presented. For a given Kmax at the notch root, the crack growth rate is much higher in a notched specimen than in a smooth one. This effect can be explained by a variation of the crack closure stress level with the local R ratio and the local stress. A strong accelerating effect of the R ratio, especially for negative values, is found in smooth specimens. Introducing a Kop correction in the experimental results leads to a good agreement between the measured crack growth rate plotted versus Keff in notched and smooth samples.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1460-2695.1996.tb01046.x
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