43—A MICROSCOPICAL STUDY OF STRAIN-INDUCED EFFECTS IN MAN-MADE FIBRES

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Abstract
Illustrated evidence is presented conceming the phenomenon of microscopically visible transverse lines that occur as a result of stressing various man-made fibres. The effect of strain is shown to be more important than that of stress. At room temperature, substantially more pronounced detail is formed at low strain-rates; for fibres from some polymers, straining in hot water further enhances the detail, but for others it does not. The evidence modifies the original assumption from a study of cellulose filaments that the lines are necessarily due to transversely aligned cavities. In fibres from thermoplastic polymers, transverse strain bands involve lateral furrows across the surface, and axial streaks which may be due to the production of voids. Some of the oblique lines found in fibres after mechanical action are believed to depend on a related kind of structural reorganization.

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