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Article

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

1
Mechanical Testing Center, ITEL Co. LTD., Cheong-ju 28220, Korea
2
Institute of Carbon Technology, Jeonju University, Jeonju-si 55069, Korea
3
Department of Mechanical and Automotive Engineering, Jeonju University, Jeonju-si 55069, Korea
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(2), 203; https://doi.org/10.3390/polym13020203
Received: 11 November 2020 / Revised: 29 December 2020 / Accepted: 6 January 2021 / Published: 8 January 2021
(This article belongs to the Special Issue Fiber Reinforced Polymers)
With the increasing use of carbon fiber reinforced plastics in various fields, carbon fiber composites based on prepregs have attracted attention in industries and academia research. However, prepreg manufacturing processes are costly, and the strength of structures varies depending on the orientation and defects (pores and delamination). For the non-contact evaluation of internal defects, the lock-in infrared thermography was proposed to investigate the defects in the composites subjected to the compression after impact test (CAI). The drop-weight impact test was conducted to study the impact behavior of the composites according to fibers orientation for composite fabricated using unidirectional (UD) carbon fiber prepregs. Using CAI tests, the residual compressive strengths were determined, and the damage modes were detected using a thermal camera. The results of the drop weight impact tests showed that the specimen laminated at 0° suffered the largest damage because of susceptibility of the resin to impact. The specimens with 0°/90° and +45°/−45° fibers orientation exhibited more than 90% of the impact energy absorption and good impact resistance. Furthermore, the specimens that underwent the impact tests were subjected to compressive test simultaneously with the lock-in thermography defects detection. The results showed that internal delamination, fibers splitting, and broken fibers occurred. The temperature differences in the residual compression tests were not significant. View Full-Text
Keywords: drop-weight impact; unidirectional carbon composites; orientation angle; internal defect; impact drop-weight impact; unidirectional carbon composites; orientation angle; internal defect; impact
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MDPI and ACS Style

Go, S.-h.; Tugirumubano, A.; Kim, H.-g. Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation. Polymers 2021, 13, 203. https://doi.org/10.3390/polym13020203

AMA Style

Go S-h, Tugirumubano A, Kim H-g. Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation. Polymers. 2021; 13(2):203. https://doi.org/10.3390/polym13020203

Chicago/Turabian Style

Go, Sun-ho; Tugirumubano, Alexandre; Kim, Hong-gun. 2021. "Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation" Polymers 13, no. 2: 203. https://doi.org/10.3390/polym13020203

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