Mengyuan Ma, Mingshun Jiang, Lei Zhang, Qingmei Sui, Lei Jia
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引用次数: 0
Abstract
This paper presents a signal correlation–based two-sided detection method to detect delamination defects in widely used carbon fiber reinforced plastics with high accuracy and a convenient process. This method can improve the accuracy of ultrasonic testing and distinguish non-defective signals from defective signals, especially those with small amplitude, and to present the depth and size of defects by images. We combined the echo signals from both sides of ultrasonic detection at the same location to extract the weak defect signals and achieved the detection of materials with high ultrasonic attenuation. First, empirical mode decomposition filtering is performed on the ultrasonic raw signal. Then, the defect echoes are identified by smart thresholding and combined with the results of ultrasonic detection on both sides. Next, the defect depth and size are calculated, and the defect image is drawn. Finally, the ultrasonic phased array C-scan obtained by the ultrasonic phased array equipment was compared with the detection results of carbon fiber laminates with artificial delamination by the algorithm of the present invention, showing that the proposed algorithm defect depth calculation error is less than 4 %, the defect size calculation error is less than 0.5 mm, and it performs well in defect shape presentation and position calculation.
期刊介绍:
This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers.
This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation.
Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.