Analyses of Monofilaments in Stretching Process by Micro-photoelasticity
1984 年 5 巻 1-2 号 p. 1-8
詳細
1984 年 5 巻 1-2 号 p. 1-8
Two models of micro-photoelastic equipments are made for trial by improving of a metallurgical microscope. One of them is reflective and the other is transparent model. The sensibility of the former model is twice compared with the latter. A test piece is soaked in a liquid bath which has the same refractive index. Photoelastic fringes can be observed clearly in a monofilament with 200-400μm in diameter. At its necking part the fringe pattern shows sometimes anomalous fringes in process of stretching. The analysis of its fringe was carried out by numerical integration. Then, at the early stage of stretching, the periphery of monofilament was elongated more than the inner part, but finally its elongation becomes uniform. Moreover, practical applications were performed preliminary with polymer monofilaments under some atmospheres.
