単繊維複合材料の破壊とAE特性 : 温度変化による影響

概要

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It is well known that the interfacial property is an important factor for the strength of fiber-reinforced composites. The temperature dependence of the interfacial property and fracture mechanisms of a single fiber composite are examined by acoustic emission. Two kinds of materials, thermosetting and thermoplastic resins, are used. The fracture surfaces are observed with a polarized microscope. The interfacial shear strength of the fiber/matrix is calculated using AE events which are almost equal to the number of fiber breakages. As a result, it is confirmed that the fracture mechanisms of SFC are different when the temperature is varied. The debonding length increases and the interfacial shear strength decreases with increasing temperature for all specimens. However, it is found that the thermoplastic resin becomes extremely brittle with decreasing temperature and the fiber breakages contribute to the fracture of the composite directly.
一般社団法人日本機械学会の論文
1995-06-25