The dual Fourier transform spectra (DFTS): a new nonlinear damage indicator for identification of breathing cracks in beam-like structures

Al-hababi, Tareq; Cao, Maosen; Alkayem, Nizar Faisal; Shi, Binkai; Wei, Qingyang; Cui, Li; Šumarac, Dragosav; Ragulskis, Minvydas

doi:10.1007/s11071-022-07743-6

Cited by 12 publications

(2 citation statements)

References 54 publications

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“…This increase in the number of peaks from undamaged to damaged conditions could be caused due to friction between the damaged surfaces. In other words, the higher harmonics could indicate the presence of the so-called breathing cracks in the oscillating structure [ 59 ]. These cracks open and close during cyclic oscillations [ 60 ].…”

Section: Results and Discussionmentioning

confidence: 99%

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

Premanand,

Prescher,

Rienks

et al. 2024

Polymers

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With ultrasonic fatigue testing (UFT), it is possible to investigate the damage initiation and accumulation from the weakest link of the composite material in the very high cycle fatigue (VHCF) regime in a shorter time frame than conventional fatigue testing. However, the thermal influence on the mechanical fatigue of composites and the scatter in fatigue data for composites under ultrasonic cyclic three-point bending loading still need to be investigated. In this study, we conducted interrupted constant-amplitude fatigue experiments on a carbon-fiber satin-fabric reinforced in poly-ether-ketone-ketone (CF-PEKK) composite material. These experiments were carried out using a UFT system, which operates at a cyclic frequency of 20 kHz with a pulse–pause sequence. Various parameters, such as the CF-PEKK specimen’s surface temperature, acoustic activity, and the ultrasonic generator’s input resonance parameters, were measured during cyclic loading. During experiment interruption, stiffness measurement and volumetric damage characterization in the CF-PEKK specimens using 3D X-ray microscopy (XRM) were performed. The locations of damage initiation and accumulation and their influence on the changes in in situ parameters were characterized. Under fixed loading conditions, damage accumulation occurred at different locations, leading to scattering in fatigue life data. Further, the damage population decreased from the surface to the bulk of the composite material.

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Section: Results and Discussionmentioning

confidence: 99%

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

Premanand,

Prescher,

Rienks

et al. 2024

Polymers

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“…At the same time, two pieces were bonded to form the intact beam. Later, Yelve et al 33 and Al-hababi et al, 34 followed the similar experimental setup for simulation of breathing crack at their laboratory and validation of their algorithms. The guidelines and procedures presented in the studies mentioned above are followed in the present work to verify the proposed Q-TKE approach for identifying single and multiple breathing cracks in beam.…”

Section: Experimental Investigationmentioning

confidence: 99%

A novel time domain-based multiple breathing crack diagnosis technique using Quadratic-Teager Kaiser Energy (Q-TKE)

Prawin

2023

Structural Health Monitoring

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This paper presents a generalized time domain-based multiple breathing crack localization technique in beams with an unknown number of cracks based on Quadratic-Teager Kaiser Energy (Q-TKE) using vibration data. Localization of multiple breathing cracks is a highly challenging inverse problem, as all these breathing cracks (more than two) might be in a similar state (either opening or closing state) at any particular time instant or in contrasting states (while some breathing cracks are opening, others are in closing state) during vibration. The level of nonlinearity of vibration response is strongly dependent not only on each crack size and location but also on the application of driving force along the cracked beam. The concept of varied input frequency excitation sources is employed in the present work for multiple breathing crack identification over the tedious traditional approach of varying input force application positions. The major advantage of using Q-TKE in the present work is that it can reliably isolate and extract the very low-amplitude nonlinear sensitive components (superharmonics and intermodulation) being buried in the total response and enhance them in the time domain signal itself. Investigations have been carried out by varying the number, spatial locations, and also intensities of the breathing cracks. Sensitivities associated with measurement noise and also with limited sensors is also investigated. The results of both numerical and experimental investigations carried out in this paper concluded that the proposed Q-TKE can effectively localize closely spaced or sparsely spaced (i.e., spatially far apart) multiple cracks in the beam. The proposed Q-TKE approach is data-driven, works with limited sensors, and does not need reference healthy state measurements.

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Development of a Machine Learning Algorithm for Efficient Localization of Damage in a Composite Structure Using Random Forest Technique

Shinagam,

Maruvada,

Janjeti

et al. 2024

Iran J Sci Technol Trans Civ Eng

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The dual Fourier transform spectra (DFTS): a new nonlinear damage indicator for identification of breathing cracks in beam-like structures

Cited by 12 publications

References 54 publications

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

A novel time domain-based multiple breathing crack diagnosis technique using Quadratic-Teager Kaiser Energy (Q-TKE)

Development of a Machine Learning Algorithm for Efficient Localization of Damage in a Composite Structure Using Random Forest Technique

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