Why interface testing by single-fibre methods can be misleading

Piggott, M. R.

doi:10.1016/s0266-3538(97)00036-5

Cited by 121 publications

(57 citation statements)

References 42 publications

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“…E.g., the coarser the fibre the higher L c . Moreover, it is known that the debonding between a fibre and a matrix under mechanical loading usually starts at the fibre end [36,37]. In composites with the same fibre mass shorter fibres mean a higher number of fibre ends where debonding can start.…”

Section: Fibre Length Distributionmentioning

confidence: 99%

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

Graupner

Albrecht²,

Ziegmann³

et al. 2016

Express Polym. Lett.

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Abstract. The present study focuses on the reprocessing behaviour of recycled injection moulded polylactide (PLA) composites. The composites are reinforced with regenerated cellulose fibres (lyocell) of variable fineness and a fibre mass content of 30%. They were reprocessed up to three times. The influence of reprocessing on the fibre length distribution and the resulting composite mechanical properties (tensile and impact strength) was analysed. While the first reprocessing cycle does not affect the mechanical characteristics of the neat PLA matrix, the strength of the composites decreases significantly due to a decreasing fibre aspect ratio. It was shown that fibres having a larger cross-sectional area display a lower aspect ratio than finer fibres, after reprocessing. This phenomenon leads to a larger decrease in tensile strength of composites reinforced with coarser fibres when compared to composites reinforced with finer fibres. A comparison of virgin composites and threefold reprocessed composites with a similar fibre length distribution resulted in a significantly higher tensile strength compared to the virgin sample. This result leads to the conclusion that not only the fibre length is drastically reduced by reprocessing but also that the fibres and the matrix were damaged.

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Section: Fibre Length Distributionmentioning

confidence: 99%

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

Graupner

Albrecht²,

Ziegmann³

et al. 2016

Express Polym. Lett.

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“…Highly oriented graphitic planes are formed on the outer surface of carbon fibre by heat treatment during manufacture [53]. This highly aligned outer layer is typically 1.5 lm thick [53] and relatively weak [54,55], and removal of this layer can increase the tensile strength [56] and improve the interface strength in carbon fibre/epoxy systems [57]. It has also been suggested that the removal of the outer layer removes surface flaws, which are known to be a significant factor for tensile strength properties [56].…”

Section: The Effect Of Fibre Degradationmentioning

confidence: 99%

“…The force eventually reaches a plateau value which is proportional to the dynamic friction. Complete load loss at debonding is likely caused by the release of strain in the fibre, coupled with the fibre undergoing Poisson's shrinkage at high fibre strain values [54]. This would result in the fibre contracting whilst the droplet was sliding at low friction, causing the droplet to 'jump' a section of the fibre [15].…”

Section: The Effect Of Coupling Agentmentioning

confidence: 99%

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

et al. 2016

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The objective of this study was to investigate the feasibility of combining discontinuous recycled carbon fibres with polypropylene, to produce a low-cost, high specific stiffness material for high-volume applications. The inherent low affinity of carbon fibre and polypropylene motivated a detailed study of the surface characteristics of carbon fibre and interfacial behaviour between the two materials, using the microbond test. The effects of removing the sizing from the fibres, as well as introducing a maleic anhydride-grafted polypropylene coupling agent, were extensively investigated. Polypropylene was found to degrade when prepared under atmospheric conditions; therefore, it was necessary to form droplets under nitrogen. Removal of the sizing from the fibre using pyrolysis and solvolysis techniques altered the surface morphology of the fibre and increased the interfacial shear strength (IFSS) by 4 and 33 %, respectively. A more significant improvement in the fibre-matrix adhesion was achieved by adding a maleic anhydride coupling agent at 2 wt%, which increased the IFSS by 320 %.

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“…Characteristics of bres and matrix itself [1,2,3], bre loading [4,5,6], bre/matrix adhesion [7,8,9], bre orientation [10,11], bre length [1,12,13], compaction (a good compaction means a low volume of voids) [14] and the production process as well as the procedural settings aect the composite properties clearly. It is well known that compression moulded (CM) long glass bre-reinforced composites display higher strength and impact strength values than short glass brereinforced injection moulded (IM) composites [4,5,10].…”

Section: Introductionmentioning

confidence: 99%

Procedural influences on compression and injection moulded cellulose fibre-reinforced polylactide (PLA) composites: Influence of fibre loading, fibre length, fibre orientation and voids

Graupner

Ziegmann

Wilde

et al. 2016

Composites Part A: Applied Science and Manufacturing

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Why interface testing by single-fibre methods can be misleading

Cited by 121 publications

References 42 publications

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

Influence of reprocessing on fibre length distribution, tensile strength and impact strength of injection moulded cellulose fibre-reinforced polylactide (PLA) composites

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

Procedural influences on compression and injection moulded cellulose fibre-reinforced polylactide (PLA) composites: Influence of fibre loading, fibre length, fibre orientation and voids

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