Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 33, Issue 10, Pages 4761-4770Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-019-0917-6
Keywords
Carbon fiber; Homogenization; Multiscale approach; Repeating unit cell; Equivalent mechanical properties
Categories
Funding
- Ministry of Trade, Industry and Energy
- Defense Acquisition Program Administration [15-CM-MA-15]
- Korea Institute of Energy Technology Evaluation and Planning [20194030202300]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1C1B6002221]
- Defense Agency for Technology & Quality (DTaQ), Republic of Korea [15-CM-MA-15-MKE] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Korea Evaluation Institute of Industrial Technology (KEIT) [20194030202300] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To improve fuel efficiency in the automotive industry, several researchers have made many attempts to replace heavy materials among the automotive components. Hence, carbon-fiber-reinforced plastic (CFRP) composites have drawn significant interest from the automotive and aerospace industries. Continuous and discontinuous carbon fiber are used as representative reinforcing materials in composite manufacturing. Recently, the use of discontinuous-fiber-reinforced plastics has increased, compared to that of continuous-fiber-reinforced plastics, owing to their cost efficiency, weight reduction, and relatively easy fabrication and handling. For composite materials, it is very important to predict mechanical properties due to their various constituents and manufacturing method. In this study, we performed a numerical analysis using homogenization technique to evaluate the equivalent mechanical properties of composites combining a nonwoven carbon fiber fabric reinforcement and epoxy resin matrix. We then compared these results with the experimental results. To calculate the equivalent mechanical properties of composites, we modeled repeating unit cells (RUCs) for homogenization-based multiscale approach, and performed finite element analysis. At the microscale level, this method was compared with the rule of mixture (ROM) theory, which is a typical homogenization technique. Based on the proven homogenization technique, we modeled RUCs for randomly distributed nonwoven carbon fiber fabric (NW-CFF) composites at the mesoscale level and calculated its equivalent properties. At the macroscale level, at which these properties could be verified, we compared the equivalent mechanical properties calculated with experimental test results, such as those of tensile, shear stiffness and Poisson's ratio.
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