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 fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis using load histories, which are realistic in relation to the types of structures studied, i.e. primarily bridges, offshore structures and chimneys.
64 citations
TL;DR: In this article, the authors used the notch stress intensity factors (N-SIFs) to predict the fatigue behavior of mechanical components weakened by V-shaped reentrant corners, where the singularity in the stress distribution makes any failure criterion based on the elastic peak stress no longer applicable.
Abstract: The stress field parameters, namely the notch stress intensity factors (N-SIFs) according to a more recent definition, can be used to predict the fatigue behaviour of mechanical components weakened by V-shaped re-entrant corners, where the singularity in the stress distribution makes any failure criterion based on the elastic peak stress no longer applicable. When the notch root radius is small but different from zero, the N-SIF can still be used, since a comprehensive analytical approach is available for open sharp and blunt notches. The fatigue strength reduction factor can be given as a function both of the elastic peak stress (only if it has a finite value) and of the N-SIF (for every notch tip radius value), by assuming that the fatigue strength of notched elements depends on a mean stress value in the critical zone.The welded joints are an example of practical N-SIF use in fatigue strength prediction. In this case not only the fatigue crack initiation life but also the fatigue crack propagat...
63 citations
TL;DR: In this paper, a theory of local stress-strain field intensity for fatigue damage at the notch is developed, which can take account of the effects of the local stress−strain gradient on fatigue damage.
63 citations
TL;DR: In this article, an acceleration factor is defined that indicates how much faster plastic strain is accumulated by a cyclic signal compared to its static mean stress, and analytical solutions of the acceleration factor are presented for triangular and square waves.
Abstract: A method is presented that allows fatigue life predictions on the basis of creep life data. The approach is based on the assumption that the time-dependent failure of polymers is determined by the intrinsic strain softening that is initiated when a critical threshold value of the plastic strain is surpassed. To facilitate fatigue predictions, an acceleration factor is defined that indicates how much faster plastic strain is accumulated by a cyclic signal compared to its static mean stress. Analytical solutions of the acceleration factor are presented for triangular and square waves, which predict that only the stress amplitude of the cyclic signal and the material's stress dependency affect fatigue life, whereas frequency plays no role. Verification using several glassy and semicrystalline polymers demonstrates that this method yields accurate quantitative lifetime predictions not only for polymers that exhibit ductile failure but also for those that display brittle fracture, provided that fracture is preceded by (localized) plastic flow.
63 citations
TL;DR: In this paper, an improved fatigue-testing methodology based on the dynamic response of the test specimen to the harmonic excitation in the near-resonant area with simultaneous monitoring of the modal parameters is presented.
63 citations