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1987
In this chapter, the technologically important subject of fatigue at high temperatures is taken up again. In Chapter 18, fatigue failure due to more or less homogeneous cavitation of grain boundaries in the whole specimen was discussed, whereas now failure by the growth of cracks under cyclic-loading conditions will be investigated.
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In this chapter, the technologically important subject of fatigue at high temperatures is taken up again. In Chapter 18, fatigue failure due to more or less homogeneous cavitation of grain boundaries in the whole specimen was discussed, whereas now failure by the growth of cracks under cyclic-loading conditions will be investigated.
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The Effect of Discontinuous Crack in Creep Crack Growth Tests
Volume 6A: Materials and Fabrication, 2013Discontinuous cracks ahead of the leading crack tip may be present in observedcertain creep crack growth tests as well as in components. In this work, a single crack of different dimensions and distance from the leading crack has been numerically modeled in a compact tension specimen using elastic, elastic-plastic and elastic-plastic-creep loading.
Nak Hyun Kim +4 more
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Modelling of Creep Crack Growth
1989Models for describing creep crack growth in terms of linear and non-linear fracture mechanics concepts are presented. When an elastic stress field is preserved at a crack tip it is shown that crack growth rate can be correlated by the stress intensity factor K and when a creep stress distribution is attained by the creep fracture parameter C*.
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Creep Crack Growth in T23 Weldments
Advances in Materials Technology for Power Plants, 2013Abstract The use of the bainitic creep strength enhanced ferritic steel T/P23 has increased over the last decade in a wide range of applications including headers, superheater and reheater tubing and in waterwall tubing. Many issues have been reported in weldments of this material, such as hydrogen induced cracking, reheat cracking and ...
J.A. Siefert, J.R. Foulds
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Mixed-Mode Creep and Creep/Fatigue Crack Growth
1991Pure mode-I, pure mode-II and mixed-mode fatigue, creep and creep/fatigue crack growth tests have been carried out on Jethete M152, an aeroengine casing material, at 550°C. A reasonably good correlation of the creep crack growth rates was obtained using the C* parameter.
T. H. Hyde, A. C. Chambers
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1984
The failure of ceramic structures at elevated temperatures involves the nucleation, growth and coalescence of cavities. The final stage of this process requires the propagation of a crack through the body. Depending on conditions, the fraction of life spent in this crack growth stage may be insignificant, or it may be life limiting.
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The failure of ceramic structures at elevated temperatures involves the nucleation, growth and coalescence of cavities. The final stage of this process requires the propagation of a crack through the body. Depending on conditions, the fraction of life spent in this crack growth stage may be insignificant, or it may be life limiting.
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Structural assessments of creep crack growth
Nuclear Engineering and Design, 1989Abstract A procedure developed within the CEGB for assessing defective components operating in the creep range is described. The procedure utilises simplified methods based on reference stress techniques to estimate three significant times: the time for failure by continuum damage mechanisms without crack extension, the time for incubation prior to ...
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A creep stress intensity factor approach to creep–fatigue crack growth
Engineering Fracture Mechanics, 2015V N Shlyannikov, A V Tumanov
exaly