Abstract
The effects of crystalline part on elongation fatigue are studied with model yarns containing dye molecules in crystalline part. The elongation fatigue tests for model yarns are made with the use of the incline tester of Scott type. During the fatiguing, tensile strength of filament increases until certain elongation cycles (fatigue limit), then decreases. The increase of growth (plastic flow) in each yarn against logarithm of cycle may be shown substantially with two straight lines. It is steeper after fatigue limit than before. These fatigue phenomena are not affected by distortion in crystalline lattice and also crystalline part is not changed throughout fatiguing of fibers. Then it may be concluded that fatigue advances in amorphous part.
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