Influence of defined amount of voids on the mechanical properties of carbon fiber‐reinforced plastics

Ashir, Moniruddoza; Nocke, Andreas; Bulavinov, Andrey; Pinchuk, Roman; Cherif, Chokri

doi:10.1002/pc.24820

Cited by 17 publications

(17 citation statements)

References 24 publications

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“…However, Esnaola et al [ 69 ] found that the fibre volume fraction of glass fibre-reinforced epoxy has no significant effect on the ILSS as determined by the short beam shear test. Nevertheless, a higher void content in the vacuum infusion samples is expected to have a negative effect on the ILSS due to the reduction in the sliding resistance between individual fibre layers by an increasing void content [ 70 ]. For the results presented here, it is assumed that the epoxy resin used in vacuum infusion leads to better fibre/matrix adhesion than the bio-based epoxy resin used in the autoclave injection process.…”

Section: Resultsmentioning

confidence: 99%

Novel Low-Twist Bast Fibre Yarns from Flax Tow for High-Performance Composite Applications

et al. 2020

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The use of natural fibres for components subjected to higher mechanical requirements tends to be limited by the high price of high-quality semi-finished products. Therefore, the present study deals with the development of more cost-effective staple fibre yarns made from flax tow. In the subsequent processing stage, the yarns were processed into quasi-unidirectional (UD) fabrics. The results of the fibre characterisation along the process chain have shown that no significant mechanical fibre damage occurs after slivers’ production. Fibres prepared from yarns and fabrics show comparable characteristics. The yarns were processed to composites by pultrusion to verify the reinforcement effect. The mechanical properties were comparable to those of composites made from a high-quality UD flax roving. The fabrics were industrially processed into composite laminates using a vacuum infusion and an autoclave injection process (vacuum injection method in an autoclave). While impact strength compared to a reference laminate based on the UD flax roving was achieved, tensile and flexural properties were not reached. An analysis showed that the staple fibre yarns in the fabric show an undulation, leading to a reorientation of the fibres and lower characteristic values, which show 86–92% of the laminate made from the flax roving. Hybrid laminates with outer glass and inner flax layers were manufactured for the intended development of a leaf spring for the bogie of a narrow-gauge railroad as a demonstrator. The hybrid composites display excellent mechanical properties and showed clear advantages over a pure glass fibre-reinforced composite in lightweight construction potential, particularly flexural stiffness.

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Section: Resultsmentioning

confidence: 99%

Novel Low-Twist Bast Fibre Yarns from Flax Tow for High-Performance Composite Applications

et al. 2020

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“…In the recent years, the fabrication of defined local defects inserted FRPs has received considerable attention from the composite community [12][13][14][15][16][17][18][19][20][21][22]. In [12][13][14], defined local defect inserted FRPs were fabricated by blind holes of varying diameters in different layers of FRPs and defined local defects of polytetrafluorethylene (PTFE).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Position of Defined Local Defect on the Mechanical Performance of Carbon-Fiber-Reinforced Plastics

Ashir

Nocke

Cherif

2019

Autex Research Journal

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Considering their energy and resource efficiency, fiber-reinforced plastics (FRPs) have been displacing metals and metal alloys for lightweight constructions. During the semiautomated manufacturing process of FRPs, and in particular during the laying of reinforced fabric layers, foreign bodies are enclosed within them, which in turn reduce the mechanical performance of FRPs. The research project presented in this article investigated if the loss in mechanical properties, such as tensile, flexural, and impact strengths, depends on the position of defined local defects, polytetrafluorethylene (PTFE) in this case, in the thickness direction of FRPs. In order to achieve this aim, PTFE was placed in different layers of reinforcing fabric before infusion. Subsequently, the mechanical performance of the fabricated FRPs was tested and evaluated. On the basis of the experiment, it can be concluded that the loss in mechanical properties was maximal if PTFE was laid in the middle position of FRPs in the thickness direction.

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“…In-depth knowledge of dynamic material behavior should enable more efficient use of materials while simultaneously preserving the structural integrity of a component under dynamic load. Although there are numerous research activities focused on novel testing methods for textiles as well as for requirement-adapted reinforcing structures in the field of FRP [6][7][8][9][10][11][12][13][14][15], current insight into fiber properties is mainly based on research results according to Wang et al [16,17].…”

Section: Introductionmentioning

confidence: 99%

Technological Development of a Yarn Grip System for High-Speed Tensile Testing of High-Performance Fibers

Unger

Schegner

Nocke

et al. 2019

Autex Research Journal

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Particularly in terms of carbon fiber (CF) rovings and further high performance fibers, it is a highly demanding task to clamp technical yarns with low elongations at break during high-speed tensile tests due to their sensitivity to shear stress. For fibers to be tested, a low elongation at break results in short testing times and requires high acceleration. In this paper, four different yarn grips that can be applied with various test machines will be introduced and compared to a wedge screw grip. By using most sensitive CF rovings, advantages and disadvantages of these gripping devices will be qualitatively evaluated by means of testing machines with test speeds of up to 20 m/s and strain rates of up to 200 s -1 , respectively. Hence, the reproducibility and precision of test results were considerably enhanced by optimizing the geometry and mass of yarn grips. Moreover, theoretical approaches and calculations for the design of yarn grips suitable for test speeds of up to 100 m/s will be presented.

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Influence of defined amount of voids on the mechanical properties of carbon fiber‐reinforced plastics

Cited by 17 publications

References 24 publications

Novel Low-Twist Bast Fibre Yarns from Flax Tow for High-Performance Composite Applications

Novel Low-Twist Bast Fibre Yarns from Flax Tow for High-Performance Composite Applications

Effect of the Position of Defined Local Defect on the Mechanical Performance of Carbon-Fiber-Reinforced Plastics

Technological Development of a Yarn Grip System for High-Speed Tensile Testing of High-Performance Fibers

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