Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation

Benfratello S; Cacciola P; Impollonia N; Masnata A; Muscolino G

    Risultato della ricerca: Article

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    Abstract

    The stationary vibrations of a beam excited by Gaussian noise are strongly affected by the presence of a fatigue crack. Indeed, as soon as the crack arises the system response becomes non-linear due to crack breathing and a non-Gaussian behaviour is encountered. The paper presents both numerical and experimental investigations in order to assess the capability of the non-Gaussianity measures to detect crack presence and position. Monte Carlo method is applied to evaluate in time domain the higher order statistics of a cantilever beam modelled by finite elements. The skewness coefficient of the rotational degrees of freedom appears the most suitable quantity for identification purpose being very sensitive to the non-linear behaviour of the cracked beam.
    Lingua originaleEnglish
    pagine (da-a)2992-3001
    RivistaEngineering Fracture Mechanics
    Volume74
    Stato di pubblicazionePublished - 2007

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    Cracks
    Higher order statistics
    Cantilever beams
    Monte Carlo methods
    Fatigue cracks

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    Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation. / Benfratello S; Cacciola P; Impollonia N; Masnata A; Muscolino G.

    In: Engineering Fracture Mechanics, Vol. 74, 2007, pag. 2992-3001.

    Risultato della ricerca: Article

    Benfratello S; Cacciola P; Impollonia N; Masnata A; Muscolino G. / Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation. In: Engineering Fracture Mechanics. 2007 ; Vol. 74. pagg. 2992-3001.
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    abstract = "The stationary vibrations of a beam excited by Gaussian noise are strongly affected by the presence of a fatigue crack. Indeed, as soon as the crack arises the system response becomes non-linear due to crack breathing and a non-Gaussian behaviour is encountered. The paper presents both numerical and experimental investigations in order to assess the capability of the non-Gaussianity measures to detect crack presence and position. Monte Carlo method is applied to evaluate in time domain the higher order statistics of a cantilever beam modelled by finite elements. The skewness coefficient of the rotational degrees of freedom appears the most suitable quantity for identification purpose being very sensitive to the non-linear behaviour of the cracked beam.",
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    AU - Benfratello S; Cacciola P; Impollonia N; Masnata A; Muscolino G

    AU - Masnata, Attilio

    AU - Benfratello, Salvatore

    PY - 2007

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    N2 - The stationary vibrations of a beam excited by Gaussian noise are strongly affected by the presence of a fatigue crack. Indeed, as soon as the crack arises the system response becomes non-linear due to crack breathing and a non-Gaussian behaviour is encountered. The paper presents both numerical and experimental investigations in order to assess the capability of the non-Gaussianity measures to detect crack presence and position. Monte Carlo method is applied to evaluate in time domain the higher order statistics of a cantilever beam modelled by finite elements. The skewness coefficient of the rotational degrees of freedom appears the most suitable quantity for identification purpose being very sensitive to the non-linear behaviour of the cracked beam.

    AB - The stationary vibrations of a beam excited by Gaussian noise are strongly affected by the presence of a fatigue crack. Indeed, as soon as the crack arises the system response becomes non-linear due to crack breathing and a non-Gaussian behaviour is encountered. The paper presents both numerical and experimental investigations in order to assess the capability of the non-Gaussianity measures to detect crack presence and position. Monte Carlo method is applied to evaluate in time domain the higher order statistics of a cantilever beam modelled by finite elements. The skewness coefficient of the rotational degrees of freedom appears the most suitable quantity for identification purpose being very sensitive to the non-linear behaviour of the cracked beam.

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