Results 211 to 220 of about 5,843 (265)
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Damage Assessment of Similar Martensitic Welds Under Creep, Fatigue and Creep-Fatigue Loading
Volume 6: Materials and Fabrication, 2020Abstract For the assessment of welds under high-temperature conditions in the creep or creep-fatigue regimes, the knowledge on the damage location and its temporal evolution are of high importance. The failure behavior of similar welds of ferritic-martensitic steels in the creep regime is well known.
Stefan Weihe +2 more
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Engineering Fracture Mechanics, 1988
Abstract This article concerns some of our recent studies on the crack initiation, early stage crack growth and its subsequent crack growth under high temperature creep, fatigue and creep-fatigue multiplication. The criteria for these and some new ideas are proposed. For instance, the relative notch opening displacement (RNOD) criterion for the crack
A.Toshimitsu Yokobori, Yokobori Takeo
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Abstract This article concerns some of our recent studies on the crack initiation, early stage crack growth and its subsequent crack growth under high temperature creep, fatigue and creep-fatigue multiplication. The criteria for these and some new ideas are proposed. For instance, the relative notch opening displacement (RNOD) criterion for the crack
A.Toshimitsu Yokobori, Yokobori Takeo
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2009
Abstract The overarching goal of life-prediction research is to develop models for the various types of time dependencies in the crack-tip damage accumulation that occur in materials subjected to elevated temperatures. This article focuses on describing the models based on creep, oxidation kinetics, evolution of crack-tip stress fields ...
Jeffrey L. Evans, Ashok Saxena
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Abstract The overarching goal of life-prediction research is to develop models for the various types of time dependencies in the crack-tip damage accumulation that occur in materials subjected to elevated temperatures. This article focuses on describing the models based on creep, oxidation kinetics, evolution of crack-tip stress fields ...
Jeffrey L. Evans, Ashok Saxena
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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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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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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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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-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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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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Advances in Creep, Fatigue and Creep–Fatigue Interaction of High Temperature Structural Materials
Transactions of the Indian National Academy of Engineering, 2022A. Nagesha +3 more
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