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.
|Data di pubblicazione:||2006|
|Titolo:||Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation|
|Autori:||S BENFRATELLO; MASNATA A|
|Tipologia:||Articolo su rivista|
|Citazione:||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.|
|Digital Object Identifier (DOI):||10.1016/j.engfracmech.2006.06.023|
|Appare nelle tipologie:||01 - Articolo su rivista|