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A probabilistic model for multiaxial high cycle fatigue
Fatigue & Fracture of Engineering Materials & Structures, 2007ABSTRACTA probabilistic framework developed to model multiaxial high cycle fatigue tests is proposed. Up to now, with a probabilistic point of view (i.e., Weibull law), models account for the stress heterogeneity effect by introducing the concept of effective volume. It is proposed to extend this concept to multiaxial load histories.
Doudard, Cédric +2 more
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A model for high cycle fatigue
Engineering Fracture Mechanics, 1992Abstract Failure due to fatigue consists of such macroscopic events as crack initiation and propagation. Microscopic events including microcrack nucleation, microcrack growth and coalescence of some of the microcracks are also important in that such crack interactions can be considered to contribute to the development of a critical defect, i.e.
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Stress-Based Fatigue Analysis High Cycle Fatigue
2012So far, we have examined fatigue from a phenomenological point of view, describing the sequence of events that take place in metals from the early submicroscopic damage that precedes microcracks formation and eventually leads to the macrocrack generation.
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1994
Kovar®, an austenitic Fe-29Ni-17Co alloy, was tested in monotonic tension and axial fatigue at stress ratios (minimum stress/maximum stress) of R= -1 and 0.1. Two annealed microstructures, having grain sizes of 14 and 65 μm, were tested. The strainhardening exponent of tensile flow curves gradually increased with strain, and then remained constant at a
JA Wasynczuk +3 more
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Kovar®, an austenitic Fe-29Ni-17Co alloy, was tested in monotonic tension and axial fatigue at stress ratios (minimum stress/maximum stress) of R= -1 and 0.1. Two annealed microstructures, having grain sizes of 14 and 65 μm, were tested. The strainhardening exponent of tensile flow curves gradually increased with strain, and then remained constant at a
JA Wasynczuk +3 more
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Materials Science Forum, 2007
In the present paper examples for propagating and non-propagating conditions of slip bands and short fatigue cracks in a ferritic-austenitic duplex steel are given, which were quantified by means of SEM in combination with automated EBSD. To classify the results within the scope of predicting the service life under HCF- and VHCF-loading conditions a ...
Ulrich Krupp +6 more
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In the present paper examples for propagating and non-propagating conditions of slip bands and short fatigue cracks in a ferritic-austenitic duplex steel are given, which were quantified by means of SEM in combination with automated EBSD. To classify the results within the scope of predicting the service life under HCF- and VHCF-loading conditions a ...
Ulrich Krupp +6 more
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Fatigue & Fracture of Engineering Materials & Structures, 2001
High‐cycle fatigue (HCF) failures in aircraft engines are attributed to material damage states, created during processing or by in‐service loading and environmental conditions, and then propagated to failure by HCF loading. The loading configuration experienced by aircraft engine turbine blades consists of an axial load caused by the centrifugal ...
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High‐cycle fatigue (HCF) failures in aircraft engines are attributed to material damage states, created during processing or by in‐service loading and environmental conditions, and then propagated to failure by HCF loading. The loading configuration experienced by aircraft engine turbine blades consists of an axial load caused by the centrifugal ...
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Micromechanics of an extrusion in high-cycle fatigue
Philosophical Magazine A, 1989Abstract A most favourably oriented crystal located at a free surface of a f.c.c. polycrystal under cyclic tension and compression of high-cycle loading is considered. An extrusion in this crystal is shown to be caused by a positive slip in one thin slice P and a negative slip in a closely located slice Q.
T. H. Lin, S. R. Lin, X. Q. Wu
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2018
In vielen Anwendungsbereichen werden Bauteile und Strukturen mit mehr als 107 Lastwechseln belastet. Beispielsweise sind Radsatzwellen und Eisenbahnrader innerhalb von wenigen Jahren nicht selten 109 Lastwechseln ausgesetzt. Auch Helikoptergetriebe haben nach einer Lebensdauer von 5000 h 109 und mehr Lastwechsel [4-1].
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In vielen Anwendungsbereichen werden Bauteile und Strukturen mit mehr als 107 Lastwechseln belastet. Beispielsweise sind Radsatzwellen und Eisenbahnrader innerhalb von wenigen Jahren nicht selten 109 Lastwechseln ausgesetzt. Auch Helikoptergetriebe haben nach einer Lebensdauer von 5000 h 109 und mehr Lastwechsel [4-1].
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DAMAGE TO STRUCTURES BY HIGH-CYCLE FATIGUE
Fatigue & Fracture of Engineering Materials and Structures, 1982— The paper shows the practical significance of theoretical studies of fatigue crack propagation in real structures, and a comparison of the results of fracture mechanics theory with the actual failure mode of structures. It follows from these conclusions that neither the influence of the magnitude and complexity of structure, nor that of the random ...
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Micromechanics of Crack Initiation in High-Cycle Fatigue
1991The author presents some previous theories of fatigue crack, gating mechanism and the quantitative effects of mean stress, grain size, strain hardening, overload and creep on fatigue crack initiation. The paper is divided into seven sections entitled: (1) Introduction; (2) Dislocations and plastic strain; (3) Slip bands under monotonic loadings; (4) A ...
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