Abstract
The use of Carbon Fiber Reinforced Plastic (CFRP) is increasing markedly, partially in the aviation industry, but it has been considered that CFRP sheets cannot be formed by press-forming techniques owing to the low ductility of CFRP. Since the mechanical characteristics of CFRP are dominated by the microscale structure, it is possible to improve its formability by optimizing the material structure. Therefore, to improve the formability, the interaction between the carbon fibers and the matrix must be clarified. In this study, microscale analyses were conducted by a finite-element model with cohesive zone elements.
Highlights
The demand for lower manufacturing costs, increased safety, improved fuel consumption and a shorter delivery time is increasing for transport equipment
Since the macroscopic mechanical characteristics of carbon fiber reinforced plastic (CFRP) sheets are dominated by the microscopic structure, such as the material properties of the fiber/matrix interface, the internal fiber orientations and the laminated form, it maybe possible to improve the formability of CFRP sheets by modifying the internal mechanical characteristics without changing the macroscopic shape
A microscale unit cell model, which has a periodicity in three dimensions, is often used to determine the quantitative mechanical properties of CFRP subjected to elastic deformation
Summary
The demand for lower manufacturing costs, increased safety, improved fuel consumption and a shorter delivery time is increasing for transport equipment. Carbon fiber reinforced plastic (CFRP) has been focused on as one of the most promising lightweight materials that can meet these requirements. It has higher specific strength and higher specific stiffness than metals, CFRP has low ductility. Because of its low ductility, a forming method that can process a large number of CFRP sheets in a short time such as press forming has not been established. Since the macroscopic mechanical characteristics of CFRP sheets are dominated by the microscopic structure, such as the material properties of the fiber/matrix interface, the internal fiber orientations and the laminated form, it maybe possible to improve the formability of CFRP sheets by modifying the internal mechanical characteristics without changing the macroscopic shape. To improve the formability, the interaction mechanism between the fibers and the matrix must be clarified
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