Crack detection in beams using changes in frequencies and amplitudes of frequency response functions

Owolabi, Gbadebo; Swamidas, A. S. J.; Seshadri, R.

doi:10.1016/s0022-460x(02)01264-6

Cited by 246 publications

(130 citation statements)

References 8 publications

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“…The identification of a single transverse crack in a beam is popularly studied using the lowest three natural frequencies which can be easily obtained (Chen et al 2005;Chinchalkar 2001;Kim and Stubbs 2003;Liang et al 1991;Nandwana and Maiti 1997;Owolabi et al 2003). However, simultaneous detection of crack parameters is much more involved and complex than the identification of single crack.…”

Section: Latin American Journal Of Solids and Structures 12 (2015) 24mentioning

confidence: 99%

A Novel Methodology Using Simplified Approaches for Identification of Cracks in Beams

Mazanoglu

2015

Lat. Am. j. solids struct.

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In this paper, natural frequency based forward and inverse methods are proposed for identifying multiple cracks in beams. Forward methods include simplified definition of the natural frequency drops caused by the cracks. The ratios between natural frequencies obtained from multi-cracked and un-cracked beams are determined by an approach that uses the local flexibility model of cracks. This approach does not consider nonlinear crack effects that can be easily neglected when the number of cracks is not excessive. In addition, an expression, which removes the necessity of repeating natural frequency analyses, is given for identifying the connection between the crack depths and natural frequency drops. These simplified approaches play crucial role in solving inverse problem using constituted crack detection methodology. Solution needs a number of measured modal frequency knowledge two times more than the number of cracks to be detected. Efficiencies of the methods are verified using the natural frequency ratios obtained by the finite element package. The crack detection methodology is also validated using some experimental natural frequency ratios given in current literature. Results show that the locations and depths ratios of cracks are successfully predicted by using the methods presented.

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Section: Latin American Journal Of Solids and Structures 12 (2015) 24mentioning

confidence: 99%

A Novel Methodology Using Simplified Approaches for Identification of Cracks in Beams

Mazanoglu

2015

Lat. Am. j. solids struct.

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“…The above reasons undoubtedly make it difficult to monitor the vibration fatigue damage of the composite in the test in real time, and it is also difficult to define the critical point of fatigue failure of the specimen, which makes it difficult to study the fatigue problem of the composites. The relationship between the modal parameters and the fatigue damage of the structure was studied by Adams et al [26][27][28][29], Kim et al [30,31], Salawu [32], Owolabi et al [33], and Zou et al [34] in the 1990s. The identification and detection of the material damage could be realized by monitoring the natural frequency and modal parameters of the structure.…”

Section: Online Monitoring Of Fatigue Damagementioning

confidence: 99%

Experimental Research on Vibration Fatigue of CFRP and Its Influence Factors Based on Vibration Testing

Fan

Jiang

Zhang

et al. 2017

Shock and Vibration

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A new research method based on vibration testing for the vibration fatigue of FRP was proposed in this paper. Through the testing on a closed-loop controlled vibration fatigue test system, the vibration fatigue phenomenon of typical carbon-fiber-reinforced plastic (CFRP) cantilevered laminate specimens was carefully studied. Moreover, a method based on the frequency response function was proposed to monitor the fatigue damage accumulation of specimens. On the basis of that, the influence factors that affect the vibration fatigue life of CFRP were experimentally studied. The influence of amplitude probability distribution of the vibration load spectrum on the fatigue life was deeply explored. Compared with Gaussian random vibration, the non-Gaussian random load has a significant impact on the vibration fatigue life of CFRP. The experimental results also showed that the magnitude of power spectral density (PSD) has a significant effect on the vibration fatigue life of specimens. For Gaussian vibration load, the frequency bandwidth almost has no effects on the vibration fatigue life of CFRP. However, for non-Gaussian vibration load, it has a great impact on the fatigue life. When PSD magnitude and frequency bandwidth are constant, the root mean square (RMS) is proportional to the vibration fatigue life of composites.

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“…Owolabi et al 3 considered two beams namely cantilever beam and fixed beam for investigation, after that they initiated cracks at seven different locations from one end to the other end (along the length of the beam), with different range of crack depth ratio. They measured acceleration frequency responses at seven different points on each beam.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

Gawande¹,

More²

2017

IJAV

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It is required that any structure must work properly during its service life time. However, due to the internal damage of structures, there may be a chance of breakdown. Therefore, structures require regular costly inspection. During the last few decades, vibration-based fault detection methods are mostly used due to their simplicity for implementation. During operation, all structures are subjected to degenerative effects that may cause initiation of structural fault such as cracks or notch that lead to the disastrous failure or collapse of the structure. It is seen that as crack or notch starts generating, there is a change in natural frequencies. This research work focuses on the examination of these changes, which is useful for identification of notch position. In this paper, the detailed analysis of cantilever beam with and without notch has been done using finite element method with the help of ANSYS and using modern national instruments LabVIEW software. This method provides the information regarding the detection, location, and characterization of the damage in the structure. This paper includes the study of dynamic properties of cantilever beams subjected to free vibration under the influence of notch at different positions along the length.

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Crack detection in beams using changes in frequencies and amplitudes of frequency response functions

Cited by 246 publications

References 8 publications

A Novel Methodology Using Simplified Approaches for Identification of Cracks in Beams

A Novel Methodology Using Simplified Approaches for Identification of Cracks in Beams

Experimental Research on Vibration Fatigue of CFRP and Its Influence Factors Based on Vibration Testing

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

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