Abstract
The compressional deformation of poly( p-phenylene terephthalamide) (PPT) fibres of the Kevlar type has been followed by scanning and transmission electron microscope methods in order to explain changes in mechanical properties. A structural mechanism describing the mode of deformation is proposed which is based on the initial formation of kink-bands. The propagation of the latter appears to be unaffected by the presence of the axially pleated-sheet structure exhibited by Kevlar fibres. The proposed mechanism is consistent with an observed loss in tensile strength after compression. It is considered that the relatively poor compressional behaviour of aramid-type fibres arises from the weak lateral cohesion between their essentially rigid molecular chains, in agreement with the findings of Greenwood and Rose.
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