期刊
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
卷 20, 期 7, 页码 1139-1148出版社
KOREAN SOC PRECISION ENG
DOI: 10.1007/s12541-019-00101-4
关键词
Crack; Imaging processing; Hole expansion ratio (HER); Greyscale value; Binarization; Zinc-coating
资金
- National Research Foundation of Korea (NRF) - Korea government [2016R1C1B1006875]
- Human Resource Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry Energy [20174010201310]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20174010201310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1C1B1006875] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper mainly focuses on development of the smart crack inspection algorithm facilitating the through-thickness crack during the hole expansion test, which makes it possible to calculate the hole expansion ratio, automatically, with the image processing technique. The proposed crack inspection algorithm consists of six steps such as binarization, blob detection, background deletion, ROI selection, image linearization, and crack identification using the C# language. This algorithm is able to capture the various types of the through-thickness and double cracks irrespective of the reflectance and the initial thickness of the applied sheet materials. In addition, it is possible to keep trace of the in-plane crack and its propagation during the HER test.
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