GS20 マイグレーションを考慮した諸燃糸複合材料の力学特性(GS-4 一般セッション4,一般セッション)

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This paper describes an effect of twist contraction ratio (TCR) on tensile properties of ramie twisted yam for green composites. Twisted yams were made from single yams using an automatic or hand-operated twisting machine, in which the number of single yams and twist per inch (TPI) were changed. Then, TPI and TCR of twisted yarns using the automatic twisting machine were measured, and compared with those obtained from the hand-operated twisting machine. As a result, the former tends to have a variation in TCR. Tensile test was carried out for the two types of twisted yams. The results show that, as TCR increase, both type of twisted yarns increase in fracture load and decrease in fracture strain, but hand-operated twisting machine can give higher tensile properties. The correlations between TCR and fracture load, and fracture strain were strong, and it is expected that TCR can be a parameter related with tensile properties of twisted yams, rather than TPI. Further more, the twisted yarn was used as a reinforcement of poly-vinyl alcohol (PVA) resin, and its mechanical properties were measured.
一般社団法人日本機械学会の論文
2011-07-16