Document Type: Article All Authors / Contributors: Chen X.; Michaels J.E.; Michaels T.E.; Lee S.J. ISSN:0963-8695 Language Note: English Unique Identifier: 810159319 Awards:
| Title | : | Load-differential imaging for detection and localization of fatigue cracks using Lamb waves |
| Author | : | Chen X.; Michaels J.E.; Michaels T.E.; Lee S.J. |
| Language | : | en |
| Rating | : | 4.90 out of 5 stars |
| Type | : | PDF, ePub, Kindle |
| Uploaded | : | Apr 12, 2021 |
Full Download Load-differential imaging for detection and localization of fatigue cracks using Lamb waves - Chen X.; Michaels J.E.; Michaels T.E.; Lee S.J. | ePub
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Used the load-differential technique in an aluminium plate, imaging techniques for detecting and visualizing crack locations.
Reflection mode inspection combined with an imaging technique can offer damage detection along with its localization [29,30]. This method has been resorted to for imaging of cracks in plate structures [31–33]. However, only attempts of imaging bolted joints are reported [34,35].
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Load-differential features are extracted from these images that capture the effects of loading as fatigue cracks are opened. Damage detection thresholds are adaptively set based upon the load-differential behavior of the various features, which enables implementation of an automated fatigue crack detection process.
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Load-differential guided wave images are generated from residual signals via delay-and-sum imaging methods, and these images are evaluated in terms of their ability to detect and localize fatigue.
Load-differential imaging for detection and localization of fatigue cracks using lamb waves: cn101266228b (zh) 2010-09-15: 一种材料声速测量方法.
Load-differential imaging for detection and localization of fatigue cracks using lamb waves.
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The efficacy of the proposed load-differential imaging method is examined using fatigue test data where multiple cracks grow from a single through-hole. Data were acquired with a spatially distributed array of piezoelectric discs by recording ultrasonic signals as a function of applied uniaxial load at intervals throughout the fatigue test.
The authors have not observed imaging of immersed plates using this methodology in the literature. These experimental results have a great interest, since it confirms that propagation of high frequency lamb waves is also possible in immersed conditions by suitable choice of frequency band and mode.
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Load-differential imaging the results of the previous section motivate an alternative approach for fatigue crack detection and localization – load-differential imaging.
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Previous research by the authors demonstrated a load-differential technique for detection and localization of fatigue cracks in simple structures that leveraged the effect of loading on crack opening. Here, loadenhanced concepts are combined with minimum variance imaging to characterize scatterers in structures with complex geometries.
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A baseline-free load-differential method using the delay-and-sum imaging algorithm is proposed for defect detection and localization. The term “load-differential” refers to the comparison of recorded ultrasonic signals at various levels of stress.
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However, the researches based on ultrasonic lamb-wave on defect detection are mainly for the flat plates. [ 9] proposed a load-differential imaging method whereby guided wave signals obtained at different loads under the same damage state to detect cracks and visualize their locations.
Load-differential imaging for detection and localization of fatigue cracks using lamb waves. Load-enhanced lamb wave techniques for characterization of scatters in structures with complex geometries.
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Load-differential imaging detects multiple fatigue cracks that have different load responses.
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Work presented here is based upon constructing a series of load-differential images using the delay-and-sum imaging algorithm. Different features from these images are selected to adaptively determine a threshold for damage detection, which enables an automated process for detection of fatigue cracks.
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The load dependence of crack opening provides a possibility for enhanced crack detection, which is well-known for higher frequency bulk waves. A load-differential method is proposed in this paper whereby guided wave signals obtained at different loads under the same damage state are compared without utilizing previously recorded damage-free data.
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The results show that the load-differential method is capable of detecting cracks and visualizing their locations.
State were compared using delay-and-sum imaging techniques for detecting and visualizing crack locations. Extended the load-differential method from12 and used minimum variance to find cracks emanating in aluminium plates from a hole with bolted and bonded doublers, and cracks emanating from multiple fastener holes.
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