Mikio Morita1, Hiromitu Takeda1 and Ituo Arima1
1Toshiba Research and Development Center, Tokyo Shibaura Electric Co., Ltd., Kawasaki
Boron filaments are tested in tension and the influence of gauge length on their mechanical properties is discussed. The mean fracture stress increases as the specimen's gauge length becomes shorter due to the decrease in flaw existence probability. The bundle strength which may be used in the ``Rule of Mixture'' for a composite strength design, is also discussed in relation to the effect of the gauge length of filaments and also to a large variation in filament's strength even if tested at a fixed length.
Effects of heat treatment in various atmospheres on the fiber's strength are also studied, and the necessity of protective coating is pointed out.
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