Analysis of the tensile behaviour of viscoelastically prestressed polymeric matrix composites

Pang, Jody W.C.; Fancey, Kevin S.

doi:10.1016/j.compscitech.2007.12.018

Cited by 35 publications

(80 citation statements)

References 9 publications

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“…In contrast with the uniform size and shape of nylon 6,6 fibres [7] however, gel-spun UHMWPE fibre cross-sections have no such uniformity, as evident from Fig. 2.…”

Section: Implications For Vppmcsmentioning

confidence: 66%

“…To date, the main body of VPPMC research has been based on prestress provided by nylon 6,6 fibres [1][2][3][4][5][6][7][8]. Nevertheless, other researchers have successfully demonstrated VPPMCs based on bamboo and, although flexural moduli were increased by only 12%, flexural toughness was improved by 28% [12].…”

Section: Introductionmentioning

confidence: 99%

“…This was a continuous multi-filament untwisted yarn comprising 1600 filaments (fibres), with 12 lm mean filament diameter (supplier specification). In common with earlier nylon fibre-based VPPMC processing [1][2][3][4][5][6][7][8], the UHMWPE fibres required annealing to remove manufacturing-induced residual stresses and provide suitable viscoelastic creep-recovery characteristics. To produce one batch, two lengths of yarn (designated test and control) were simultaneously annealed (unconstrained) at 120°C for 0.5 h in a fan-assisted oven.…”

Section: Composite Sample Productionmentioning

confidence: 99%

“…A bespoke stretching rig [6][7][8]13] was then used to subject the test yarn to a 24 h creep load of 1.3 GPa, whilst the control yarn was positioned (unconstrained) in close proximity for exposure to the same ambient conditions (19.5-21.0°C). These were the conditions previously developed for UHMWPE fibre composite production [13].…”

Section: Composite Sample Productionmentioning

confidence: 99%

“…Using Charpy impact testing, VPPMC samples have been found to absorb typically 25-30% more impact energy than their control (unstressed) counterparts, with some samples reaching increases of 50% [1][2][3][4][5][6]. Tensile tests [7] have demonstrated increases in strength, modulus and energy absorption exceeding 15%, 30% and 40% respectively; also threepoint bend tests [8] have shown flexural moduli to be $50% greater than corresponding control samples.…”

Section: Introductionmentioning

confidence: 99%

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UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties

Fazal

Fancey

2014

Composites Part B: Engineering

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a b s t r a c tThe impact properties of continuous unidirectional UHMWPE fibre-reinforced polyester resin composites have been investigated, to elucidate the effects of prestress on energy absorption characteristics. Prestress within composite samples was produced by subjecting the UHMWPE fibres to a creep load, which was then released prior to moulding. From Charpy impact tests, these viscoelastically prestressed samples absorbed $20% more energy than their control (unstressed) counterparts, with some batches reaching 30-40%. Generally, whether prestress is created through elastic or viscoelastic means, fibre-matrix debonding is regarded as being a major energy absorption mechanism in this type of composite, but this was not evident in the current study. Instead, evidence of debonding at the skin-core interface within the UHMWPE fibres was found, the skin regions possessing lower stiffness and longer term viscoelastic activity. Skin-core debonding appears to have a significant energy absorbing role within the prestressed samples and we believe it is a previously unrecognised mechanism.

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“…In contrast with the uniform size and shape of nylon 6,6 fibres [7] however, gel-spun UHMWPE fibre cross-sections have no such uniformity, as evident from Fig. 2.…”

Section: Implications For Vppmcsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Composite Sample Productionmentioning

confidence: 99%

Section: Composite Sample Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties

Fazal

Fancey

2014

Composites Part B: Engineering

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Viscoelastically Prestressed Polymeric Matrix Composites

Fancey¹

2012

Polymer Composites

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Vegetable fiber pre‐tensioning influence on the composites reinforcement

et al. 2013

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The automated manufacturing of several complex shape composite parts simultaneously by compression and transfer molding method faces the problem of poor elastic properties of synthetic fibers, what leads to the insufficient depth of formed part and fiber breakage. Alternative to synthetic fibers, vegetable fibers have higher elasticity and lower impact on environment, but due to the lower fiber bulk integrity and orientation vegetable fibers have lower strength. However, fiber pre‐tension processes involved in various composite manufacturing routes could enhance the fibrous reinforcement orientation and increase tensile strength. Nevertheless, the influence of this method commonly is used to increase the flexural strength of the composites and its influence on the tensile properties of the composite was not studied. Thus, the aim of this work was to investigate vegetable fiber pre‐tensioning influence on the tensile and flexural properties of the composites. It was obtained that significant enhancement of flexural performance is caused by the residual compressive forces propagated in the matrix polymer, achieved only at high values of pre‐tension (approximately at 50–70% of the ultimate strength of the reinforcement), while even minimal pre‐tension load significantly increases the tensile strength of the composite. Thus, the pre‐tension technique is particularly effective in the case of vegetable fibers reinforced composite, whose properties after pre‐tension are comparable with the properties of glass fiber composites. POLYM. COMPOS., 34:1533–1537, 2013. © 2013 Society of Plastics Engineers

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Analysis of the tensile behaviour of viscoelastically prestressed polymeric matrix composites

Cited by 35 publications

References 9 publications

UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties

UHMWPE fibre-based composites: Prestress-induced enhancement of impact properties

Viscoelastically Prestressed Polymeric Matrix Composites

Vegetable fiber pre‐tensioning influence on the composites reinforcement

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