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, the authors developed reliability-based methods for determining the fatigue life of structural details associated with conventional displacement type surface monohull ships based on the S-N approach and on the assumption that fatigue damage accumulation is a linear phenomenon (i.e., that follows Miner's rule).
Abstract: Marine and offshore structures are subjected to fatigue loadings primarily due to the action of seawater waves and the sea environment in general. The load cycles in such an environment can be in the order of a million cycles per year. Fatigue failures in these structures can take place at sites of high stress concentration that can be classified by two major categories: baseplate and weldments. The former includes locations of high stress concentration such as openings, sharp re-entry corners, and plate edges. In general, the mechanisms behind these failures are described by the general approaches to fatigue life prediction as discussed in this paper. There are two major approaches for predicting fatigue life: (1) the S-N curve approach and (2) the fracture mechanics (FM) approach. The S-N curve approach is based on experimental measurement of fatigue life in terms of cycles to failure for different loading levels and specimen geometries, while the fracture mechanics (FM) approach is based on the existence of an initial crack and subsequent crack propagation under cyclic load. The objective of this paper is to develop reliability-based methods for determining the fatigue life of structural details associated with conventional displacement type surface monohull ships based on the S-N approach and on the assumption that fatigue damage accumulation is a linear phenomenon (i.e., that follows Miner's rule). The methods are also based on structural reliability theory and can be applied either in direct reliability-based design or in a load and resistance factor design (LRFD) format. The resulting design methods are referred to as the reliability-based design approach for fatigue of marine structures. These design methods were developed according to the following requirements: (1) spectral analysis of wave induced loads, (2) use of conventional fatigue design codes, (3) nominal strength and load values, and (4) achieving target reliability levels. The first-order reliability method (FORM) was used to perform reliability assessments and to develop the partial safety factors (PSFs) for fatigue limit state equations.
53 citations
TL;DR: In this paper, the authors used linear elastic fracture mechanics (LEFM) and extended finite element method (XFEM) to predict the total fatigue life of components, that is, the crack initiation and propagation life.
53 citations
01 May 1980
TL;DR: In this article, the results from numerous experiments indicate that the fatigue phenomenon cannot be connected to static strength and that the ability to take repeated loads is reduced regardless whether the static strength is increased or decreased.
Abstract: The results from numerous experiments indicate that the fatigue phenomenon cannot be connected to static strength. A specimen or a construction has a fatigue life limit. If the construction has endured some fatigue loading. The ability to take repeated loads is reduced regardless whether the static strength is increased or decreased.
53 citations
TL;DR: In this article, a self-powered piezo-floating-gate (PFG) sensor was used to detect distortion-induced fatigue cracking of steel bridges. But, the results indicate that the proposed method is capable of detecting different damage progression states, especially for the sensors that are located close to the damage location.
53 citations
TL;DR: In this article, the authors present the field stress and displacement measurements in controlled load tests and long-term monitoring to investigate the performance of two retrofitted details, which were used to alleviate the cracking problems of an existing steel bridge.
53 citations