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  • Ji, Baoping  (6)
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  • 1
    Online Resource
    Online Resource
    Delamination Detection in Bimetallic Composite Using Laser Ultrasonic Bulk Waves
    MDPI AG ; 2021
    In:  Applied Sciences Vol. 11, No. 2 ( 2021-01-11), p. 636-
    Details
    In: Applied Sciences, MDPI AG, Vol. 11, No. 2 ( 2021-01-11), p. 636-
    Abstract: In this study, a method based on laser ultrasonic bulk waves is used to detect delamination in a bimetallic composite. For this purpose, several artificial delamination defects were created in a copper-aluminum sample using wire-electrode cutting. The research includes numerical simulation and experimental analysis. The propagation process of laser ultrasonic in Cu/Al bimetallic compo-site, the interaction between bulk waves and composite interface, and the effect of delamination defects on the ultrasound field were studied by numerical simulation. Suitable parameters and features were determined by numerical simulation, which provided a basis for the parameter se-lection of experimental research. The reflected shear waves from the composite interface can act as a sensitive feature to detect the delamination in Cu/Al bimetallic composites. The distance between the detection point and the excitation point was set to 2 mm to take into account the detection resolution and efficiency. The experimental results were in good agreement with the simulation results, and the C-scan image can intuitively show the location and size of delamination defects. The detection method based on laser ultrasonic bulk waves can effectively detect the delamination in Cu/Al bimetallic composite, which is suitable for the on-line detection of the rolling composite process.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app11020636
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2704225-X
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  • 2
    Online Resource
    Online Resource
    Non-contact detection of delamination in stainless steel/carbon steel composites with laser ultrasonic
    Elsevier BV ; 2021
    In:  Optik Vol. 226 ( 2021-01), p. 165893-
    Details
    In: Optik, Elsevier BV, Vol. 226 ( 2021-01), p. 165893-
    Type of Medium: Online Resource
    ISSN: 0030-4026
    URL: Article
    DOI: 10.1016/j.ijleo.2020.165893
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2040037-8
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  • 3
    Online Resource
    Online Resource
    Application of laser ultrasonic for detecting delamination in Cu/Al composites
    Elsevier BV ; 2021
    In:  Optik Vol. 243 ( 2021-10), p. 167426-
    Details
    In: Optik, Elsevier BV, Vol. 243 ( 2021-10), p. 167426-
    Type of Medium: Online Resource
    ISSN: 0030-4026
    URL: Article
    DOI: 10.1016/j.ijleo.2021.167426
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2040037-8
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  • 4
    Online Resource
    Online Resource
    Evaluation of the Thickness of Each Layer of Cu/Al Laminate Using Laser Ultrasonic
    MDPI AG ; 2023
    In:  Coatings Vol. 13, No. 3 ( 2023-03-18), p. 645-
    Details
    In: Coatings, MDPI AG, Vol. 13, No. 3 ( 2023-03-18), p. 645-
    Abstract: A new method of detecting the thickness of each layer of Cu/Al laminates based on laser ultrasound was proposed for the online non-contact measurement of the thickness of each layer of Cu/Al laminates during the rolling process. This method utilized a laser to excite and detect ultrasounds remotely and then obtains the transit time of the longitudinal wave pulse in the copper layer and aluminum layer to calculate their thicknesses. The finite element method was used for investigating the propagation behavior of longitudinal wave in Cu/Al laminate, and the minimum thickness of the copper layer that can be detected by this method was analyzed. The laser ultrasonic experimental platform was set up in the laboratory, and a sample of Cu/Al laminate with step shape was made. The experimental results demonstrate that the laser ultrasound can realize the non-contact and high-precision detection of the thickness of each layer of Cu/Al laminates and has the potential of online thickness measurement.
    Type of Medium: Online Resource
    ISSN: 2079-6412
    URL: Article
    DOI: 10.3390/coatings13030645
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2662314-6
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  • 5
    Online Resource
    Online Resource
    Non-contact Detection of Delamination in Cu/Al Laminated Plate with Laser Ultrasonic
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 926, No. 1 ( 2020-09-01), p. 012003-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 926, No. 1 ( 2020-09-01), p. 012003-
    Abstract: In this paper, a non-contact non-destructive inspection method based on laser ultrasonic was proposed for the detection of interface delamination in Cu/Al laminated plates. The finite element model of laser ultrasonic Cu/Al laminated plates were built to analyze the propagation of laser ultrasound in Cu/Al laminated plates and the effects of interface delamination defects on the ultrasonic field distribution. The simulation results were verified by the laser ultrasonic detection system. The C-scan detection results realizes the visual detection of delamination defects, and provides precise information about the composite quality of the Cu/Al laminated plates. Experimental results show that laser ultrasonic technology has great potential for online non-contact detection of Cu/Al laminated plates.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/926/1/012003
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
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  • 6
    Online Resource
    Online Resource
    Evaluation of the Bond Quality of Metal-Clad Plates Using Laser Ultrasonic Local Resonance
    MDPI AG ; 2024
    In:  Coatings Vol. 14, No. 4 ( 2024-04-12), p. 474-
    Details
    In: Coatings, MDPI AG, Vol. 14, No. 4 ( 2024-04-12), p. 474-
    Abstract: The effective detection of delamination defects, especially sub-millimeter delamination defects, in metal-clad plates is of great significance in improving product quality. In this work, the laser ultrasonic (LU) local resonance method is used to locate and characterize the sub-millimeter defects in stainless/carbon steel-clad plates. The influence of the delamination radius on the amplitude and resonant frequency of the laser ultrasound was investigated using 2D axisymmetric finite element (FE) simulations. The simulation results show that both the amplitude and the first resonance frequency (FRF) are effective features for detecting large-scale delamination defects, but the FRF is a better feature for detecting tiny delamination defects. A 304/Q235/304-clad plate specimen was made through a hot rolling bonding process, which contained a large number of self-forming delamination defects. The laser ultrasonic signals of different composite states collected in the experiment have good consistency with the simulated waveforms. The experimental results show that the laser ultrasonic local resonance method is a high-resolution imaging method, which can locate and characterize the sub-millimeter delamination defects in stainless/carbon steel-clad plates.
    Type of Medium: Online Resource
    ISSN: 2079-6412
    URL: Article
    DOI: 10.3390/coatings14040474
    Language: English
    Publisher: MDPI AG
    Publication Date: 2024
    detail.hit.zdb_id: 2662314-6
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