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, an experimental procedure for continuously measuring strain level, temperature, and energy-dissipation rate during resonant fatigue tests is described, based on a previous method for measuring loss factor (Ref. 3) using base-excited cantilever-beam specimens vibrating at resonance.
Abstract: An experimental procedure for continuously measuring strain level, temperature, and energy-dissipation rate during resonant fatigue tests is described. The technique is based on a previous method for measuring loss factor (Ref. 3) using base-excited cantilever-beam specimens vibrating at resonance. The amplitude and frequency dependence of loss factor is therefore included directly in the measurement. For beams vibrating in vacuum, energy-dissipation rate and temperature measurements provide a basis for irreversible thermodynamic analysis of fatigue. This procedure provides a continuous measurement of energy-dissipation rate during fatigue-crack nucleation, and is the basis for experimental study of the hypothesis that the entropy gained during fatigue failure is a material constant.
15 citations
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15 citations
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TL;DR: In this paper, an experimental strategy is developed to simultaneously estimate static and dynamic as well as linear and nonlinear vibration features to detect cracks on-line with the execution of a fatigue test.
Abstract: To monitor the structural health during fatigue tests, classical nondestructive tests (ultrasonic inspection, liquid penetration, eddy current, etc.) are usually performed at regular time instances. Unfortunately, the fatigue tests should be interrupted to use these techniques. In addition, a large amount of user interaction is required. In this article, vibration features are used to detect cracks on-line with the execution of a fatigue test. To perform this task, an experimental strategy is developed to simultaneously estimate static and dynamic as well as linear and nonlinear vibration features. By means of these features the sensitivity of static versus dynamic and linear versus nonlinear damage detection techniques will be qualified. Finally, it will be shown that by using nonlinear identification techniques, additional information on the damage scenario can be extracted. The validation will be done on a steel beam with a propagating fatigue crack.
15 citations
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01 May 2015TL;DR: In this paper, the relationship between the stress concentration factors Kts to the depths h and diameters Φ of blind holes was investigated based on the finite element method and the E-Mode, built-in the lock-in...
Abstract: The relationships between the stress concentration factors Kts to the depths h and diameters Φ of blind holes were investigated based on the finite element method. The E-Mode, built-in the lock-in ...
15 citations