Results 261 to 270 of about 42,527 (308)
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1983
Creep has been a subject of considerable practical and theoretical interest. In recent years, however, there has been a shift in the way creep has been viewed. In earlier times creep was looked at as a plastic deformation process with the emphasis on studying plastic flow as a function of time, temperature, stress, etc.
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Creep has been a subject of considerable practical and theoretical interest. In recent years, however, there has been a shift in the way creep has been viewed. In earlier times creep was looked at as a plastic deformation process with the emphasis on studying plastic flow as a function of time, temperature, stress, etc.
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Crack Growth in Creeping Solids
1983The creep crack growth behavior in a creep-ductile material, 6061 aluminum, and a creep brittle material, Ti-6242, has been investigated. In the creep ductile material an observed load dependency in the relation between the load-point displacement rate, ˙Δ, and the crack growth rate, ˙a, precluded the straightforward application of the C* approach.
VM Radhakrishnan, AJ McEvily
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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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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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Creep crack growth in creep-brittle Ti-6242 alloys
Materials at High Temperatures, 1992A creep-brittle titanium alloy Ti-6242, which is being used for aeroengine applications, was chosen to study the effects of loading conditions and microstructure on creep crack growth (CCG) behaviour at 500°C. Tests were made on compact tension (CT) specimens under both displacement rate control and under constant load.
B. Dogan, A. Saxena, K.-H. Schwalbe
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Creep crack growth under small-scale creep conditions
International Journal of Fracture, 1990Two different constitutive models are employed to describe creep crack growth under small-scale creep conditions theoretically. The first model combines elastic/nonlinear viscous deformation fields \(\mathop \varepsilon \limits^ \cdot = \mathop \sigma \limits^ \cdot /E + A{\sigma ^n}\) with a critical-strain criterion, e = e c to be satisfied at a ...
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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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Cavitation damage and creep crack growth
Metallurgical Transactions A, 1981The effect has been investigated of prior damage on the creep crack propagation characteristics of 0.5 pct Cr, 0.5 pct Mo, 0.25 pct V steel at 823 K. On a macroscopic basis, the parametersK 1 andC * both appear to correlate withda/dt although the parameterC * is unable to ...
R. Pilkington, D. A. Miller, D. Worswick
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Creep crack growth in alloy 718
Metallurgical Transactions A, 1977Subcritical crack growth behavior in Alloy 718 was studied under creep conditions at 538, 649, and 760°C (1000, 1200, 1400°F) and crack growth rates were correlated using both linear and nonlinear elastic fracture mechanics. The results show that for a given stress intensity value crack growth rate increases significantly with increase in temperature ...
K. Sadananda, P. Shahinian
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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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