強力レーヨン疲労機構の微細構造的解明
1962 年 18 巻 12 号 p. 1049-1056
詳細
1962 年 18 巻 12 号 p. 1049-1056
Various kinds of high tenacity rayons were fatigued to various extents with Ferry Vibration Tester.
In the swelliug mediums that is, R. H. 65%, water and NaOH solutions of various concentrations, the stress-strain curves of fatigued and original samples were determined to observe the differences between two samples, and the fatigue mechanisms of high tenacity rayons are discussed from the viewpoint of fine structure.
When the fibers are fatigued the following appeares in the stress-strain curves:
1. Increase of molecular chain orientation.
2. Relaxation of cohesive bonds by chain scission or slippage.
3. Macro-inhomogeneities by the occurrence of weak points or cracks.
The change of the fine structures of fibers by fatigue is generally discussed, as well as on the experimental results of static fatigue. From the results, when high tenacity rayons are fatigued by dynamic or static methods, it is concluded that fatigue proceeds in the order of the following;
1. Destruction in amorphous regions
2. Destruction in crystalline regions
3. Breakage of molecular chains.
