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Title |
Investigating Mechanical Properties of CFRP considering Specimen Dimensions
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Authors |
최종권(Jongkwon Choi) ; 김창혁(Changhyuk Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.3.267 |
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Keywords |
탄소섬유보강폴리머; 미끌림; 형상변수; 인장강도; 탄성계수 carbon fiber reinforced polymer (CFRP); slip; shape parameter; tensile strength; elastic modulus |
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Abstract |
Due to the drastic increase of aging infrastructures, the demands for the repair and strengthening of existing structures have become of extreme importance. One of the most economical and efficient repair and strengthening materials, which has been extensively researched and widely used to extend the service life and improve the structural capacity of existing structures, is carbon fiber reinforced polymer (CFRP). To accurately evaluate the structural performance of repaired and strengthened structures with CFRP, basic mechanical properties of CFRP has to be qualitatively measured. Though a standard test method (ASTM D3039) is currently available, no specific details for specimen dimensions are provided. This may lead to confusion and inconsistency among researchers. In this paper, to investigate the influence of specimen dimensions on the tensile behavior, three representative dimensions - length, thickness, and width - were selected as test variables and a series of CFRP strips were fabricated and tested. CFRP strips were subjected to a monotonically increasing uniaxial tensile load in accordance with ASTM D3039. A total of nine strain gauges were installed on each specimen and continuously monitored until a tensile failure was observed. To comprehensively evaluate the test results, a shape parameter was introduced and used to propose an optimal shape of the CFRP strip test specimen.
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