期刊
APPLIED SCIENCES-BASEL
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/app11020636
关键词
bimetallic composite; delamination; nondestructive testing; laser ultrasonic; bulk wave
类别
资金
- National Natural Science Foundation of China [51575040]
- Natural Science Foundation of Beijing Municipality [3202019]
- Fundamental Research Funds for the Central Universities Project [FRF-TP-19-039A2Z]
This paper presents a testing method based on laser ultrasonic bulk waves for the detection of interface delamination defects in a Cu/Al bimetallic plate produced by sandwich rolling. Numerical simulation and experimental analysis were conducted to determine suitable parameters and features, with a detection point-to-excitation point distance of 2 mm for resolution and efficiency. Experimental results were in good agreement with simulation results, showing the effectiveness of the method for detecting delamination in Cu/Al bimetallic composites.
Featured Application This paper presents a testing method based on laser ultrasonic bulk waves for the detection of interface delamination defects in a Cu/Al bimetallic plate produced by sandwich rolling. 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.
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