VIBRATION FATIGUE ANALYSIS IN THE FINITE ELEMENT ENVIRONMENT

NWM Bishop        

Anales de la Mecánica de la Fractura, nº 16 . 1999 . Pág. 8 -23
Ver (.pdf): Anales16-002

Resumen: Fatigue damage is traditionally determined from time signals of loading, usually in the form of stress or strain. However, there are many design scenarios when the loading, or fatigue damage process, cannot easily be defined using time signals. In these cases the design engineer usually has to use a test based approach to evaluate the fatigue life of his structure or component. Or, alternatively, a frequency based fatigue calculation can be utilised where the loading and response are represented using Power Spectral Density (PSD) functions. One very important design problem, which falls into this category, is that of acoustic fatigue. However, there are also many other situations where structures are subjected to a random form of loading such as wing flutter, landing gear runway profiles, engine vibrations and so on. Al! of these situations can be analysed using new fatigue life estimation techniques now incorporated into the Finite Element Analysis (FEA) environment. The theory of random vibration fatigue has seen a number of important developments over the last fifteen years. The author has been personally involved in developing new fatigue analysis theories and structural analysis techniques in the frequency domain (see [1]-[9]). More recently this work has focused on the link with FEA because of he powerful design opportunities which this creates. The work has found many important practica! applications. This paper presents a state of the art perspective of random vibration fatigue technology and FEA based fatigue analysis. A number of design applications are presented.

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