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Micromechanical approach to the tensile strength of unidirectional composites

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This paper deals with the micromechanics of advanced composites. The characteristics of individual fibers, matrix, and the fiber/matrix interface are the most important factors for evaluating fiber-reinforced composite materials from a micromechanical viewpoint. To this purpose, we first developed a testing device with which the load-elongation curve of a monofilament can be obtained. Filament diameter was measured by the aid of laser diffraction. Using these devices, we have tensile-tested several kinds of monofilaments and accumulated data. The strength distribution agreed fairly well with the Weibull distribution. The fiber/matrix interaction was also examined with a single fiber embedded model. By measuring a fragment length, an ineffective length was calculated. This paper will provide the basic data to the second report in which the strength of unidirectional composites is predicted by means of computer simulation.

Keywords: Fiber/matrix interface; Fragment; Monofilament; Test device; Weibull distribution

Document Type: Research Article


Affiliations: Department of Materials Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278, Japan

Publication date: 1994-01-01

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