高強度・高弾性単繊維の横方向圧縮試験と環境効果(<小特集>材料のミクロ・メゾ評価)

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This paper describes the quasi-static lateral compression tests of high-strength, high-elastic-modulus fibers. The fibers examined were γ-alumina fiber (Altex) by Sumitomo Chemical Co. Ltd., two types of carbon fibers by Mitsubishi Rayon Co. Ltd., and four types of aramid fibers by du Pont and Teijin Ltd. Special attention was paid to the environmental influence of water absorption, electron or ultraviolet radiation on lateral compression behavior of aramid fibers. The mechanical testing machine employed was a specially designed testing machine (load range : 0.1mN〜5N, accuracy : 0.02 mN), which enables mechanical testing including fatigue of microelements. By using the testing machine, the lateral compression of fibers whose diameter ranged from 7 to 17 μm was achieved with sufficient precision. The lateral compression behavior of the carbon fibers and ceramic fiber exhibits brittle nature : most of load-displacement curve follows the elastic deformation, with a final catastrophic failure into small pieces. However, that of the aramid fibers shows more ductile nature : a very early stage of load-displacement curve is elastic, and the rest is plastic. Final catastrophic fracture that is observed in ceramic and carbon fibers do not occur, with large amount of plastic deformation. The influence of electron radiation on the transverse elastic modulus of aramid fibers is negligible. However, water absorption as well as ultraviolet radiation lowers the transverse elastic modulus. The fiber surface was closely examined by using an atomic force microscope, and the influence of environment on surface degradation and deformation behavior is discussed.
1999-03-25

高強度・高弾性単繊維の横方向圧縮試験と環境効果(<小特集>材料のミクロ・メゾ評価)

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