Composite resin reinforced with pre-tensioned glass fibers. Influence of prestressing on flexural properties

Schlichting, Luís Henrique; Andrada, Mauro Amaral Caldeira de; Vieira, Luiz Clóvis Cardoso; Barra, Guilherme Mariz de Oliveira; Magne, Pascal

doi:10.1016/j.dental.2009.09.004

Cited by 35 publications

(22 citation statements)

References 20 publications

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“…The significant increase of flexural stress at maximum load is observed only at higher loads of pre‐tension, which can be related to the compressive forces applied to the matrix polymer; the higher is the pre‐tensioning, the higher are the compressive forces induced to the matrix. These results coincide with the results of other works, where the efficient influence of pre‐tension on the flexural properties of composite at 50–70% of the ultimatetensile strength of the reinforcement were reported .…”

Section: Resultssupporting

confidence: 92%

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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Section: Resultssupporting

confidence: 92%

Vegetable fiber pre‐tensioning influence on the composites reinforcement

et al. 2013

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“…The design and application of the fiber system used in this study may require further optimization as it is suggested that the best results may be obtained when the cusps are overlapped 32 or transfixed 39 by the fibers. Further studies are also needed to explore different possibilities like the use of unidirectional fibers, other positioning methods, or use of pretensioned fibers 38 . Regardless of the system used, special attention should be given to the maximum preservation of tooth structure, which is the first goal of modern restorative dentistry.…”

Section: Discussionmentioning

confidence: 99%

“…Different fiber systems can be used. Although some authors favor woven (mostly isotropic) polyethylene fibers, 35,36 others recommend the use of unidirectional (orthotropic) glass fibers 37–39 . A well‐designed fiber system should influence the stress distribution mechanism and, depending on its location and orientation, be effective in stopping, reducing, or redirecting the propagation of cracks 35,36 .…”

Section: Introductionmentioning

confidence: 99%

Computer‐Aided‐Design/Computer‐Assisted‐Manufactured Adhesive Restoration of Molars with a Compromised Cusp: Effect of Fiber‐Reinforced Immediate Dentin Sealing and Cusp Overlap on Fatigue Strength

Magne

Boff

Oderich

et al. 2011

J Esthet Restor Dent

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“…These improvements are explained by the residual stresses (i) impeding or deflecting propagating cracks and (ii) reducing strains within the composites from external tensile or bending loads [3−5]. More recent investigations include unidirectional glass fiber EPPMCs as potential dental materials, the prestress increasing flexural strength by ∼30% and unidirectional carbon fiber EPPMCs, with increases of ∼30% in impact toughness . In addition to opportunities for EPPMCs to improve mechanical properties (without the need to increase section dimensions or weight), there has been interest in their use as bistable (morphing) composites, either as prestressed laminates or as unidirectional fiber prestressed structural elements .…”

Section: Introductionmentioning

confidence: 99%

Prestressed polymeric matrix composites: Longevity aspects

Fancey

Fazal

2015

Polymer Composites

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Elastically prestressed polymeric matrix composites (EPPMCs) are produced by stretching fibers (e.g., glass) within the composite during matrix curing. The resulting prestress can enhance mechanical performance, without increasing section dimensions or weight. Viscoelastically prestressed polymeric matrix composites (VPPMCs) can provide similar benefits, these being produced by subjecting polymeric fibers (e.g., nylon 6,6) to a creep load, which is released prior to molding. Although VPPMCs offer simplified processing and flexibility in product geometry, long-term viscoelastic activity within the prestressing fibers is sensitive to time-temperature limitations. In this study, nylon 6,6 fiber-polyester resin samples were subjected to accelerated ageing. Using time-temperature superposition, the samples were maintained at 70 C for 2,298 h, representing a 20-fold ageing increase over previous work. Subsequent Charpy impact testing (at 20 C) demonstrated that the VPPMC samples absorbed 40% more energy than corresponding control (unstressed) counterparts; i.e., no deterioration in impact performance was observed, over a duration equivalent to 25 years at 50 C. In contrast, the

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Composite resin reinforced with pre-tensioned glass fibers. Influence of prestressing on flexural properties

Cited by 35 publications

References 20 publications

Vegetable fiber pre‐tensioning influence on the composites reinforcement

Vegetable fiber pre‐tensioning influence on the composites reinforcement

Computer‐Aided‐Design/Computer‐Assisted‐Manufactured Adhesive Restoration of Molars with a Compromised Cusp: Effect of Fiber‐Reinforced Immediate Dentin Sealing and Cusp Overlap on Fatigue Strength

Prestressed polymeric matrix composites: Longevity aspects

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