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Multiaxial creep-fatigue damage
Nuclear Engineering and Design, 1978Abstract This paper presents an alternative method for extending the various methods of creep-fatigue damage assessment from the uniaxial to general multiaxial regimes. Specifically, the method gives a procedure for determining a reasonable strain range in multiaxial situations where loading may not be proportional.
D.W. Lobitz, R.E. Nickel
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Design and Assessment for Creep-Fatigue and Creep-Fatigue Crack Growth
Volume 1B: Codes and Standards, 2016Creep-fatigue assessments require inputs for both creep damage and fatigue damage. Then these damage terms are combined using some form of interaction diagram to enable estimation of the creep-fatigue life. Similarly, creep-fatigue crack growth assessments need separate calculations of creep crack growth, fatigue crack growth and again possibly some ...
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Creep-Fatigue-Oxidation Interactions
2012The fracture maps of Ashby display the various modes of creep fracture. Creep damage results from the nucleation of cavities on grain boundaries. Viscoplastic deformation can be the controlling mechanism. Hull and Rimmer model is at the basis of diffusion controlled nucleation.
Dominique François +2 more
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1994
In this chapter the main factors influencing high temperature creep—fatigue crack growth in engineering materials are discussed. The significance of minimum to maximum load ratio R, frequency, environment and temperature are considered in turn. Transgranular cycle dependent and intergranular time dependent controlled cracking processes are identified ...
G. A. Webster, R. A. Ainsworth
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In this chapter the main factors influencing high temperature creep—fatigue crack growth in engineering materials are discussed. The significance of minimum to maximum load ratio R, frequency, environment and temperature are considered in turn. Transgranular cycle dependent and intergranular time dependent controlled cracking processes are identified ...
G. A. Webster, R. A. Ainsworth
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Creep-Fatigue Damage Evaluation of Grade 91 Steel Using Interrupt Creep Fatigue Test
Volume 1A: Codes and Standards, 2018The Sodium Fast-cooled Reactor (SFR), are generation IV nuclear power plants, have a target operating temperature of 550°C which makes creep-fatigue behavior more critical than a generation III nuclear power plants. So it is important to understand the nature of creep-fatigue behavior of the piping material, Grade 91 steel.
Uijeong Ro +4 more
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Mechanisms of creep-fatigue interaction
Metallurgical Transactions A, 1982Experiments on a model material have shown that creep-fatigue interaction is possible by one of several mechanisms. At low temperatures failure occurs by initiation and propagation of a crack, and is transgranular. At higher temperatures failure is caused by cumulative damage of intergranular cavities dispersed throughout the specimen.
S. Baik, R. Raj
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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/fatigue/environmental interactions
1995The cyclic behaviour of materials at high temperature is more complicated than its low-temperature equivalent, because the amplitude and the duration of the cycle both cause material damage.
R. K. Penny, D. L. Marriott
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High temperature creep-fatigue design
Transactions of the Indian Institute of Metals, 2010Generation IV fission and future fusion reactors envisage development of more efficient high temperature concepts where materials performances are key to their success. This paper examines different types of high temperature creep-fatigue interactions and their implications on design rules for the structural materials retained in both programmes.
A. -A. F. Tavassoli +2 more
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2001
Fatigue consists of the cycling loading of a structure over time, that is loading and unloading. Thus, the new aspect introduced is the unloading, which suppresses proportional loading at the crack tip and leads to the accumulation of residual stresses after unloading.
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Fatigue consists of the cycling loading of a structure over time, that is loading and unloading. Thus, the new aspect introduced is the unloading, which suppresses proportional loading at the crack tip and leads to the accumulation of residual stresses after unloading.
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