Polypropylene matrix composites reinforced with pre‐stressed glass fibers

Zhao, Jianhong; Cameron, John H.

doi:10.1002/pc.10093

Cited by 18 publications

(24 citation statements)

References 8 publications

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“…Method C (8)(9)(10)(11), the new manufacturing method provides higher shear modulus property to the composite system. Based on the above evidence, Method D, the combination of fiber surface silica modification and fiber prestressing benefits the composite system by both fiber-matrix interlocking and loose-fiber straightening.…”

Section: Properties Of Modified Reinforced Epoxy Compositementioning

confidence: 99%

Flexural and Shear Properties of Silica Particle Modified Glass Fiber Reinforced Epoxy Composite

Cao

Cameron

2006

Journal of Reinforced Plastics and Composites

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The objective of this study is to develop a new method of manufacturing glass fiber reinforced epoxy composites and to quantitatively show that the properties of such a new material are superior to that of a conventional fiber reinforced polymer composite of the same material base composition. To achieve this objective, the glass fiber (GF) reinforced epoxy composite samples are prepared in four different ways: Method A, using 'clean' GF as the reinforcement (i.e., with no modification or additional treatment to the as-received fiber); Method B, modifying the surface of the GF with silica particles before applying in the composite system; Method C, prestressing the clean GF during the curing procedure of the composite; and Method D, prestressing the silica modified GF during the curing procedure of the composite. Preparation by Method D is the newly developed method. The finished composite samples are tested by the three-point bend test and the short-beam shear test under ASTM standard conditions. The results indicate that the composites prepared by the new method, which include the GF surface modification and the GF prestressing preparation conditions, have an excellent combination of properties when compared to the specimens made by the other three methods.

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Section: Properties Of Modified Reinforced Epoxy Compositementioning

confidence: 99%

Flexural and Shear Properties of Silica Particle Modified Glass Fiber Reinforced Epoxy Composite

Cao

Cameron

2006

Journal of Reinforced Plastics and Composites

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“…The pre-stressing rig design developed by Zhao and Cameron [ 42 ] is illustrated in Figure 6 where the fibres were first wound onto a steel frame and then it was attached to a secondary frame. The pre-stress loading of the fibres on the frame was achieved via a tensile test machine.…”

Section: Review Of Techniques For Manufacturing Pre-stressed Compomentioning

confidence: 99%

“…Jevons et al [ 43 ] adapted the design originally proposed by Zhao and Cameron [ 42 ] and developed a method for pre-stressing cross-ply laminates that could be processed in an autoclave. Their design consisted of C-channel sections with four clamps linked to the frame by bolts as illustrated in Figure 7 .…”

Section: Review Of Techniques For Manufacturing Pre-stressed Compomentioning

confidence: 99%

Monitoring Pre-Stressed Composites Using Optical Fibre Sensors

Krishnamurthy¹,

Badcock

Machavaram

et al. 2016

Sensors

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Residual stresses in fibre reinforced composites can give rise to a number of undesired effects such as loss of dimensional stability and premature fracture. Hence, there is significant merit in developing processing techniques to mitigate the development of residual stresses. However, tracking and quantifying the development of these fabrication-induced stresses in real-time using conventional non-destructive techniques is not straightforward. This article reports on the design and evaluation of a technique for manufacturing pre-stressed composite panels from unidirectional E-glass/epoxy prepregs. Here, the magnitude of the applied pre-stress was monitored using an integrated load-cell. The pre-stressing rig was based on a flat-bed design which enabled autoclave-based processing. A method was developed to end-tab the laminated prepregs prior to pre-stressing. The development of process-induced residual strain was monitored in-situ using embedded optical fibre sensors. Surface-mounted electrical resistance strain gauges were used to measure the strain when the composite was unloaded from the pre-stressing rig at room temperature. Four pre-stress levels were applied prior to processing the laminated preforms in an autoclave. The results showed that the application of a pre-stress of 108 MPa to a unidirectional [0]16 E-glass/913 epoxy preform, reduced the residual strain in the composite from −600 µε (conventional processing without pre-stress) to approximately zero. A good correlation was observed between the data obtained from the surface-mounted electrical resistance strain gauge and the embedded optical fibre sensors. In addition to “neutralising” the residual stresses, superior axial orientation of the reinforcement can be obtained from pre-stressed composites. A subsequent publication will highlight the consequences of pres-stressing on fibre alignment, the tensile, flexural, compressive and fatigue performance of unidirectional E-glass composites.

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“…Prestraining is a technique used widely in civil engineering to enhance the mechanical performance of reinforced concrete that is cast around tensioned tendons (usually steel bars). The mechanical properties of glass fiber reinforced polymer‐matrix composites can be enhanced using prestraining . It has been demonstrated recently that prestraining of a twist‐structured flax yarn during resin curing can also improve the mechanical performance of the resulting natural fiber yarn‐reinforced polymer matrix composites …”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties of glass fiber reinforced polymer-matrix composites can be enhanced using prestraining. [15][16][17][18] It has been demonstrated recently that prestraining of a twist-structured flax yarn during resin curing can also improve the mechanical performance of the resulting natural fiber yarnreinforced polymer matrix composites. [19] In this paper, we report the production of twistless wrap-spun yarns comprised of a flax fiber core wrapped by a highly stretchable filament.…”

Section: Introductionmentioning

confidence: 99%

Prestrained twistless flax yarn as reinforcement for polymer‐matrix composites

et al. 2019

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We report a technique to improve the mechanical performance of aligned fiber‐reinforced polymer‐matrix composites utilizing a twistless wrap‐spun yarn structure. Conventional wrap‐spinning technology introduces crimps to the yarn structure, which is a source of fiber misalignment in the final composites. Here, we report a twistless wrap‐spun yarn constructed from flax fibers and an extensible wrapping filament so that the yarn crimp can be removed during composite fabrication. This is achieved by applying a prestrain to the yarn while the resin is being cured during compression molding. The study demonstrates that this manufacturing technique can be simply and efficiently utilized to produce highly aligned and twistless natural fiber yarn‐reinforced polymeric composites with up to 25% and 45% improvements in mechanical properties.

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Polypropylene matrix composites reinforced with pre‐stressed glass fibers

Cited by 18 publications

References 8 publications

Flexural and Shear Properties of Silica Particle Modified Glass Fiber Reinforced Epoxy Composite

Flexural and Shear Properties of Silica Particle Modified Glass Fiber Reinforced Epoxy Composite

Monitoring Pre-Stressed Composites Using Optical Fibre Sensors

Prestrained twistless flax yarn as reinforcement for polymer‐matrix composites

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