Direct observation of compressive deformation of PBO fibre in the SEM
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Polybenzobisoxazole fibres were compressed uniaxially in a tension-compression stage for direct observation of deformation in a scanning electron microscope. Kink bands were observed to develop on the fibre surface at early stages of deformation. They seemed to initiate heterogeneously and propagate across a large part of the fibre. Both the length and thickness of the band increased dramatically with slight compression. Upon continued deformation, cracks or openings were seen to develop from surface irregularities near the kink bands. The cracks or openings extended along the fibre length while new bands continued to develop adjacent to them. Cracks and kink bands seemed to be mutually inducible to result in a localized bulge at later stages of deformation. In Kevlar 49 fibres, cracks or openings seemed to develop at higher compressive strains notably at intersections of kink bands.
KeywordsPolymer Electron Microscope Scanning Electron Microscope Direct Observation Fibre Length
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