Topic
Vibration fatigue
About: Vibration fatigue is a research topic. Over the lifetime, 3460 publications have been published within this topic receiving 46297 citations.
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TL;DR: In this article, a study of fatigue-life distributions of concrete for various levels of applied stresses was conducted to obtain the fatigue lives of concrete at various given stress levels, and the results showed that the shape parameter of the Weibull distribution for the fatigue life of concrete ranges from 2.0 to 4.0, depending on the applied fatigue stress.
Abstract: The paper presents a study of fatigue-life distributions of concrete for various levels of applied stresses. An experiment was conducted to obtain the fatigue lives of concrete at various given stress levels. The concrete beam specimens were tested under 4-point flexural loading. Three different levels of applied fatigue stresses were considered. The present study indicates that the probabilistic distributions of fatigue life of concrete depend on the level of applied fatigue stress. The shapes of the Weibull distribution to describe the fatigue life of concrete differ for various levels of applied stresses. This effect must be taken into account in realistic fatigue reliablity analysis to secure adequate fatigue resistance of concrete structures. The graphnical method, the method of moment, and the method of maximum likelihood estimation are shown to yield very similar values of distribution parameters for the present fatigue data. The shape parameter of the Weibull distribution for the fatigue life of concrete ranges from 2.0 to 4.0, depending on the level of applied fatigue stress.
147 citations
TL;DR: In this article, a damage variable that is consistent with the fatigue damage mechanism is defined and a corresponding fatigue damage evolution equation is derived by connecting the damage variable with the static toughness exhaustion during fatigue, which is further examined in both theory and experiment.
145 citations
TL;DR: Prediction of fatigue reliability of welded multi-planar tubular joints of the support structure of a fixed jacket offshore wind turbine designed for a northern North Sea site in a water depth of 70 m is performed.
144 citations
Abstract: It is shown that acoustic second harmonic generation is a useful tool for studying surface microcrack development during fatigue of a high‐strength aluminum alloy. A fundamental (5 MHz) surface acoustic wave (SAW) was transmitted across the gauge section of flexural fatigue specimens of Al 7075‐T6. The second harmonic amplitude was determined after several increments of fatigue, as a function of external load and the amplitude of the fundamental. It was found that the second harmonic signal is at a maximum close to zero external load and increases with progressing fatigue. Harmonic generation, attributable to microcracking at the surface, has been observed as early as 10–20% of the expended fatigue life. A simple analysis to obtain a coefficient of harmonic‐generation efficiency versus applied surface stress is described. This analysis considers the effect of changes in attenuation of the fundamental and harmonic waves associated with degree of surface microcrack opening as a function of surface stress. I...
142 citations
TL;DR: In this paper, the authors examined the fatigue behavior of a unidirectional composite lamina from theoretical and experimental viewpoints and established a technique to use experimental data to simulate the behavior of that ply in multiaxial fatigue loading.
138 citations