Results 261 to 270 of about 134,317 (310)

Very high cycle fatigue

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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High cycle fatigue life of metals

Materials Science and Engineering, 1974
Abstract In eight different materials with U.T.S. ranging from 5 to 80 kpmm−2 the fatigue life curves were determined both for cycling with constant stress amplitude and for cycling with constant plastic strain amplitude in the high cycle region (number of cycles to fracture > 105).
P. Lukáš, M. Klesnil, J. Polák
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Very high cycle fatigue – Is there a fatigue limit?

International Journal of Fatigue, 2011
Abstract The paper gives an overview of the present state of research on fatigue strength and failure mechanisms at very high number of cycles ( N f  > 10 7 ). Testing facilities are listed. A classification of materials with typical S – N curves and influencing factors like notches, residual stresses and environment are given.
B. Pyttel, D. Schwerdt, C. Berger
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High-cycle fatigue of silver halide infrared fibers

Applied Optics, 1994
The transmission of CO(2) laser radiation by silver halide infrared fibers was measured during cyclic bending of the fibers. High-cycle fatigue of the fibers was investigated. The fibers were found to transmit without significant deterioration after more than 10(7) cycles.
A, German, N, Barkay, A, Katzir
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A model for high cycle fatigue

Engineering Fracture Mechanics, 1992
Abstract 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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A probabilistic model for multiaxial high cycle fatigue

Fatigue & Fracture of Engineering Materials & Structures, 2007
ABSTRACTA 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, Hild, François, Calloch, Sylvain   +2 more
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Very high cycle fatigue measuring techniques

International Journal of Fatigue, 2014
Abstract Ever since high-strength steels were found to fail below the traditional fatigue limit when loaded with more than 108 cycles, the investigation of metals’ and alloys’ very high cycle fatigue properties has received increased attention. A lot of research was invested in developing methods and machinery to reduce testing times.
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Critical issues in high cycle fatigue

International Journal of Fatigue, 1999
High cycle fatigue (HCF) failures in materials used in rotating components of gas turbine engines have often been found to be attributable to fatigue loading on materials which have sustained damage from other sources. Damage can be present in the form of initial material or manufacturing defects, or can develop during service operation.
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Small Cracks and High-Cycle Fatigue

Aerospace, 1996
Abstract The problem of high-cycle fatigue (HCF) failures that has recently plagued the aircraft jet-engine industry is associated with the rapid growth of small defects under the action of high-frequency vibrational or resonant loading; such defects have been associated with regions of microstructural damage attributed to such processes
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Notch Effect in High Cycle Fatigue

2001
This paper presents a different approach for the estimation of fatigue life duration of notched shafts. The traditional approach, which is based on the notch radius and the stress concentration factor, is not applicable for all stress concentration geometries, for example shafts with key-seats.
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