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Article

A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System

1
Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, Korea
2
Division of Electronics Engineering, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, Korea
3
Innotems Corp., Techno 1-ro, Yuseong-gu, Daejeon 34015, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(17), 5992; https://doi.org/10.3390/app10175992
Received: 1 August 2020 / Revised: 24 August 2020 / Accepted: 28 August 2020 / Published: 29 August 2020
(This article belongs to the Special Issue Intelligent Processing on Image and Optical Information, Volume II)
Strain gauges are commonly used for tension tests to obtain the strain of a metal test specimen. They make contact, however, so the gauges are not applicable to every type of test specimen. That is the reason why a non-contact type measurement system is required. Nanofibrous mats, manufactured by electrospinning, have different structures and thicknesses. Displacement and strain distributions for all ranges of the specimen have never been demonstrated for nanofiber mats so far. Wrinkled nanofibrous mats of polyurethane were made and then tension-tested. The Digital Image Correlation (DIC) method was employed to measure displacement, then to calculate strain for all areas of the specimen. The DIC system consisted of a CMOS camera, control PC and operating software with a DIC algorithm: then, the Center of Gravity (COG) algorithm was used for this system. A cross-head speed of 3 mm/min was set for the tension test. The image record speed was one frame a second. In total, 400 image frames were obtained from the start, and then displacement and strain distributions were acquired for a 400 second tension test. The strain distribution from DIC system showed good agreement with the test result by a universal testing machine. View Full-Text
Keywords: digital image correlation; nanofiber mat; tension test; strain distribution digital image correlation; nanofiber mat; tension test; strain distribution
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MDPI and ACS Style

Park, N.G.; Hong, K.M.; Kwon, K.H. A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System. Appl. Sci. 2020, 10, 5992. https://doi.org/10.3390/app10175992

AMA Style

Park NG, Hong KM, Kwon KH. A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System. Applied Sciences. 2020; 10(17):5992. https://doi.org/10.3390/app10175992

Chicago/Turabian Style

Park, Nak Gyu, Kyung Min Hong, and Kyu Hyeung Kwon. 2020. "A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System" Applied Sciences 10, no. 17: 5992. https://doi.org/10.3390/app10175992

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