Prestressed polymeric matrix composites: Longevity aspects

Fancey, Kevin S.; Fazal, Adnan

doi:10.1002/pc.23387

Cited by 23 publications

(63 citation statements)

References 28 publications

(53 reference statements)

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“…Therefore, the TSSP shares the same basis as the TTSP, i.e., the free volume theory. A successful transformation of the log α T (temperature shift factor) values from creep 15 and stress relaxation have been reported in relation to predicting the long‐term behavior of recovery in polyamide 6,6 fiber and the (associated) impact toughness in polyamide fiber‐based VPPMCs . Therefore, in addition to creep, the applicability of α σ to recovery behavior was also evaluated in the current work.…”

Section: Time‐stress Superposition Principlementioning

confidence: 96%

Application of time–stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its “true” elastic modulus

Wang

Fancey

2017

J of Applied Polymer Sci

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The viscoelastic behavior of semi-crystalline polyamide 6,6 fiber is exploited in viscoelastically prestressed polymeric matrix composites. To understand better the underlying prestress mechanisms, strain-time performance of the fiber material is investigated in this work, under high creep stress values (330-665 MPa). A latch-based Weibull model enables prediction of the "true" elastic modulus through instantaneous deformation from the creep-recovery data, giving 4.6 6 0.4 GPa. The fiber shows approximate linear viscoelastic characteristics, so that the time-stress superposition principle (TSSP) can be implemented, with a linear relationship between the stress shift factor and applied stress. The resulting master creep curve enables creep behavior at 330 MPa to be predicted over a large timescale, thus creep at 590 MPa for 24 h would be equivalent to a 330 MPa creep stress for 5200 years. Similarly, the TSSP is applied to the resulting recovery data, to obtain a master recovery curve. This is equivalent to load removal in the master creep curve, in which the yarns would have been subjected to 330 MPa creep stress for 4.56 3 10 7 h. Since our work involves high stress values, the findings may be of interest to those involved with long-term load-bearing applications using polyamide materials.

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Section: Time‐stress Superposition Principlementioning

confidence: 96%

Application of time–stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its “true” elastic modulus

Wang

Fancey

2017

J of Applied Polymer Sci

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“…Production of the VPPMC strips followed previously described procedures [6,8,9], the main points being outlined here. A continuous multifilament yarn of nylon 6,6 fibres, similar to material previously studied (140 filaments, 26 mm filament diameter, 94 tex), was used.…”

Section: Methodsmentioning

confidence: 99%

“…1. The cross-sectional spatial density of prestressing fibres in VPPMC strips can be non-uniform due to open casting [6,8,9]; thus a thin strip could undergo bending, to give a mid-span deflection, δ, in Fig. 1.…”

Section: Principlementioning

confidence: 99%

“…Following curing, the previously strained fibres continue to attempt viscoelastic recovery, producing compressive stresses within the matrix that are counterbalanced by residual tension in the fibres. Previous work has demonstrated notable improvements in mechanical properties from VPPMCs, especially impact toughness and flexural stiffness, using nylon 6,6 fibres [6,8,9] and UHMWPE fibres [10]. A key benefit here is production flexibility: the fibre stretching and moulding operations are decoupled, which can simplify equipment requirements and procedures.…”

Section: Introductionmentioning

confidence: 95%

“…A further benefit is longevity: potential deterioration through localised matrix creep would be offset by activity from longer term viscoelastic recovery mechanisms within the polymeric fibres [6]. Although viscoelastic activity is temperature sensitive, recent accelerated ageing experiments on nylon 6,6 fibre-based VPPMCs demonstrate no deterioration in performance over a duration equivalent to $25 years at 50°C [8].…”

Section: Introductionmentioning

confidence: 99%

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A bistable morphing composite using viscoelastically generated prestress

Wang

Fancey

2015

Materials Letters

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a b s t r a c tElastically generated prestress within polymeric composites can be used to create bistable morphing structures; i.e. they can 'snap through' between one of two states. In this paper, a morphing bistable structure has been produced, utilising viscoelastically generated prestress. Here, polymeric fibres are subjected to a tensile (viscoelastic) creep load which is released before the fibres are moulded into a matrix. Following curing, the previously strained fibres continue to attempt viscoelastic recovery, creating compressive stresses within the matrix that are counterbalanced by residual tension in the fibres. The bistable structure consists of prestressing strips bonded to the sides of a thin, flexible resinimpregnated fibre-glass sheet. Bistability is achieved through pairs of strips orientated to give opposing cylindrical configurations within the sheet. It is envisaged that viscoelastically prestressed morphing structures may overcome the potential limitations of elastic prestressing; i.e. production flexibility and product longevity.

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Morphological, thermal, and solid‐state viscoelastic properties of thermoplastic polyester elastomer‐graphitic carbon nitride composites

Ercan,

Boroglu

2023

J of Applied Polymer Sci

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In order to evaluate the effect of graphitic carbon nitride (g‐C3N4) incorporation on the physical properties of thermoplastic polyester elastomer (TPEE) composites using a comparative approach, the composite films were prepared by the solution mixing method and solvent evaporation methods. For this purpose, the g‐C3N4 nanoparticles were synthesized by direct thermal condensation reaction of melamine and characterized by FTIR, SEM, XRD, BET, and TGA, respectively. The diameters of the g‐C3N4 particles ranged from ∼90 to 480 nm and the g‐C3N4 exhibited a high thermal stability up to 570°C, which was attributed to the robust heptazine‐based structure. The morphology, structure, thermal stability, solid‐state viscoelastic behavior, and friction coefficient of the TPEE composites were evaluated depending on the composition. The results showed that the g‐C3N4 nanoparticles improved the thermal stability and reduced the friction coefficient of the TPEE films. It was also found that g‐C3N4 addition into the TPEE matrix significantly reduced the permanent deformation in the solid state. The findings indicate that low‐cost g‐C3N4 nanoparticles can be used as an effective additive to enhance the performance of TPEE films in various applications.

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Prestressed polymeric matrix composites: Longevity aspects

Cited by 23 publications

References 28 publications

Application of time–stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its “true” elastic modulus

Application of time–stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its “true” elastic modulus

A bistable morphing composite using viscoelastically generated prestress

Morphological, thermal, and solid‐state viscoelastic properties of thermoplastic polyester elastomer‐graphitic carbon nitride composites

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