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In discontinuous fiber-reinforced composites, short fibers act as reinforcing materials, and their morphological characteristics (length and orientation) can greatly affect the properties of the composites, such as tensile, electrical, or thermal conductivity. There is a very important issue in describing the morphological characteristics of reinforcing fibers, but the disorder of short fibers increases the difficulty in resolving issue. In this study, an image processing method was used to extract the morphological characteristics of discontinuous fibers in composites, and the conductive properties of short-carbon-fiber-reinforced indium tin oxide (ITO) films were analyzed. Among them, the effective length of the fibers consistently correlated with the surface resistance of the composites. At the same time, in this study, we analyzed the relationship between the area ratio of different carbon materials (carbon fiber, carbon nanotubes, and graphene) and the surface resistance of their composites, and also extended the application of the image processing method.

RoM, as a reinforcement theory of composite materials, has been widely used. With the advent of new materials and molding processes, this theory is constantly being refined and validated. In this paper, four high-tech fibers as continuous reinforcing materials and carbon nanotubes as non-continuous reinforcing materials were evaluated, and two ideal composite samples were designed using three-dimensional printing technology. The reliability of RoM was verified by tensile testing. Also, a fiber tensile fixture was designed. The fiber bundle strength was inversely proportional to the length and the number of roots of fiber. In verifying the RoM, three-dimensional printing was employed, showing the diversity and complexity of the testing samples.

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