|発明の名称||STRESS MEASUREMENT SENSOR|
PROBLEM TO BE SOLVED: To provide a small, lightweight, easily-handleable, and high- performance fiber fracture detection type stress measurement sensor.
SOLUTION: When continuous fibers of silicon carbide based fiber are subjected to oxidation treatment in the air, an oxide coating is formed on the surface. Heat difference treatment or chemical treatment is applied for regulating the strength distribution of a single filament. A continuous fiber bundle 2 obtained in this way is arranged in one direction, and the continuous fiber bundle is integrated/combined to be molded with a base material such as a fiber reinforcing composite material serving as an insulating material, resin, metal or ceramic. When electrodes are attached to the obtained one directional composite member, a stress measurement sensor 1 is formed. In the silicon carbide based fiber, electric resistance is increased even before its fracture according to an increase in the stress, and in a low stress area, a gentle increase of the electric resistance fluctuation ratio is observed. However, the electric resistance fluctuation ratio is increased greatly once the fracture is started in the fiber.
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