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Abstract

Morphology and tensile properties of acrylic fibers with different manufacturing histories have been investigated. Acrylic fibers that have been partially drawn undergo appreciable plastic deformation after passing through a yield point and exhibit "crazing" over the entire surface. On the other hand, acrylic fibers that have been fully drawn and annealed display no yield point or crazing and have a lower modulus and con siderably reduced elongation-to-break. SEM photomicrographs of tensile fractures in dicate that the former acrylic fibers show a straight fracture along a transverse section, while the latter invariably fail by axial splitting. The morphological structure of acrylic fibers develops and is perfected as a consequence of the manufacturing process, which alters the fibers' response to applied tensile stress.

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Plastic Deformation,Crazing,and Fracture Morphology of Acrylic Fibers1

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