Abstract
The plastic deformation of a drawn filament of nylon 6•10 under compression perpendicular to the fiber axis has been investigated. The internal structure of the drawn filament is altered from the fibrous structure to the lamellar one by annealing at a temperature near the melting point. Evidences for the structual change are observed in wide-angle and small-angle X-ray patterns and in loadelongation curves. The form of plastic deformation under compressive forces perpendicular to the fiber axis depends also on the type of the internal structure. In the case of the specimen of the lameller type, observation with a polarizing microscope reveals that compression produces two sets of fine bands which intersect each other making a particular angle. Such bands do not appear in the specimen of the fiber-type. When a specimen of the fiber-type is compressed at a higher temperature, coarse deformattion bands appear and these are considered to be similar in character to the usual slip bands produced by shearing a plastic solid.
