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Specific features of high‐cycle and ultra‐high‐cycle fatigue
Fatigue & Fracture of Engineering Materials & Structures, 2002ABSTRACT Several specific features of high‐cycle fatigue (HCF) and ultra‐high‐cycle fatigue (UHCF) are discussed both on the basis of direct experimental results and on the basis of speculations extrapolating HCF data to the UHCF regions. The following points are dealt with: (i) Extent and distribution of cyclic plastic deformation. (ii) Sensitivity of
P. LUKÁŠ, L. KUNZ
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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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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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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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Key Engineering Materials, 2007
The material quality, the deformation rate, the temperature and the stress state influence mechanical behaviour and properties of different materials. Due to this great variety of the influencing factors we do not have one model of general validity describing the behaviour of materials, but we have to use a great number of material constants in order ...
Gyula Nagy, János Lukács
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The material quality, the deformation rate, the temperature and the stress state influence mechanical behaviour and properties of different materials. Due to this great variety of the influencing factors we do not have one model of general validity describing the behaviour of materials, but we have to use a great number of material constants in order ...
Gyula Nagy, János Lukács
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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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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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High cycle fatigue, low cycle fatigue and failure modes of a carburized steel
International Journal of Fatigue, 2004An experimental investigation is conducted for better understanding fatigue and fracture of carburized steel used in the construction of vehicle transmission elements such as gears and shafts. Fatigue tests of case hardened specimens are carried out in low and high cycle regimes.
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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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