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Title |
Evaluation on Strain and Necking Region of the Rebar by Using Image Processing Method
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Authors |
정진환(Jin-Hwan Cheung) ; 이종한(Jong-Han Lee) ; 우태련(Tae-Ryeon Woo) ; 정치영(Chi-Young Jung) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.1.033 |
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Keywords |
변형률 ; 철근 ; 변형률 분포 ; 넥킹 ; 영상분석 strain ; rebar ; strain distribution ; necking ; image processing method |
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Abstract |
This study conducted uniaxial tension tests on D10, D19, D29, and D35 SD400 steel-grade rebar and evaluated the strain distributions and necking regions to provide basic data for resolving differences between evaluation methods. Owing to the limitations of the existing measurement methods, this study conducted detailed evaluations of the strain of the rebar and necking regions using image processing, which is almost limitless on the measurement range and can easily distinguish measurement regions. The strain was concentrated at the region where necking occurred when the rebar approached its ultimate strength, which was successfully confirmed through image processing. The correlation between the length of the necking region and the diameter of the rebar could be analyzed by evaluating the necking region that occurs during the ultimate behavior of the rebar. According to the results, the length of the necking region is around 1.5~2.5 times the diameter of the rebar.
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