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| Determination and analysis of CFRP based ondigital image correlation photometry |
1. Taizhou Institute of Science and Technology, Nanjing University of Technology and Engineering, Taizhou, Jiangsu 225300, China; 2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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Abstract To test the tensile elastic modulus and bending modulus of carbon fiber reinforced plastics(CFRP), the tensile test and three point bending test of CFRP specimens were carried out. The measurement and analysis of electrical measurement and digital image correlation (DIC) optical measurement were also conducted. The results show that the tensile modulus values measured by electrical method and DIC optical method are 19.1 GPa and 19.3 GPa, respectively, and the results are similar. The flexural modulus values measured by electrical method and DIC optical method are 18.5 GPa and 19.2 GPa, respectively, and the results are quite different. A threepoint bending finite element model is established based on the electrical data of axial tensile specimens. The displacement field and strain field of specimens by the electrical measurement method are consistent with the analysis results by the DIC optical measurement method, which verifies the reliability of the calculation results of the DIC optical measurement method. Compared with the electrical measurement method, the DIC optical measurement method has the advantages of non-contact, field test features and so on. It can be used to monitor the displacement field in the surface area of specimen in real time and obtain the strain field in the surface area.
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Received: 29 March 2021
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