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.

S BENFRATELLO, MASNATA A (2006). Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation. ENGINEERING FRACTURE MECHANICS, 6, 20-30 [10.1016/j.engfracmech.2006.06.023].

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

BENFRATELLO, Salvatore;MASNATA, Attilio
2006

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.
S BENFRATELLO, MASNATA A (2006). Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation. ENGINEERING FRACTURE MECHANICS, 6, 20-30 [10.1016/j.engfracmech.2006.06.023].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/20032
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