AN INVESTIGATION OF THE BENDING FATIGUE OF MODIFIED PPTA FIBRE

PPTA fibres have high axial tensile strength,but the transverse links at the macromolecularlevel of the fibres are low.The high orientation and crystallization of the PPTA fibres leads to alow resistance to bending fatigue.A comparative study on fatigue behaviour of PPTA fibres and modified PPTA fibres weremade by rotating fibre over a pin.The resistant properties of the PPTA fibre to the bending fa-tigue are low,but can be improved by modification.The morphological differences of the deformation processes of the PPTA fibres and modi-fied PPTA fibres as they are tensioned in a monofilament from after being knotted are shown.The properties of resistance to bending fatigue of the different PPTA fibres can be evaluatedby comparing the morphologies of the tensile broken ends of these fibres after knotting.

AN INVESTIGATION OF THE BENDING FATIGUE OF MODIFIED PPTA FIBRE

PPTA fibres have high axial tensile strength,but the transverse links at the macromolecular level of the fibres are low.The high orientation and crystallization of the PPTA fibres leads to a low resistance to bending fatigue. A comparative study on fatigue behaviour of PPTA fibres and modified PPTA fibres were made by rotating fibre over a pin.The resistant properties of the PPTA fibre to the bending fa- tigue are low,but can be improved by modification. The morphological differences of the deformation processes of the PPTA fibres and modi- fied PPTA fibres as they are tensioned in a monofilament from after being knotted are shown. The properties of resistance to bending fatigue of the different PPTA fibres can be evaluated by comparing the morphologies of the tensile broken ends of these fibres after knotting.