Effect of Stitching on Plain and Open-hole Strength of CFRP Laminates

Zheng, Yao; Cheng, Xiaoquan; Baig, Yasir

doi:10.1016/s1000-9361(11)60411-1

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…The increase was observed when stitched at a 45° angle. 31 It is hypothesized that with further work in the placing of tufting yarns in this study, a much more significant increase in the open-hole tensile strengths could have been achieved.…”

Section: Resultsmentioning

confidence: 84%

Influence of extrusion parameters on filled polyphenylsulfone tufting yarns on open-hole tensile strength

McGarrigle

Wegrzyn

Han

et al. 2022

Journal of Reinforced Plastics and Composites

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Tufting has been shown to improve the mechanical properties of composites. Unlike other published works which rely on commercially available materials, for this study, continuous polymer yarns with diameters ranging from 160 μm to 720 μm of unfilled PPSU and PPSU nanocomposites with 1 wt.% of carbon nanotubes (CNT) were prepared using a twin-screw extruder. The tensile properties of these yarns generally improved with the addition of CNT at higher values of ‘screw speed to haul-off’ ratio. This effect is correlated with the yarn draw down ratio and attributed to the nanofiller orientation induced in the thermoplastic matrix. The fibres exhibited as much as a 23% increase in Ultimate Tensile Strength (UTS) for the same parameter set when loaded with CNT. Depending on filler and processing parameters set, yarns varied in UTS from 96.4 MPa to 206.2 MPa for unfilled PPSU and PPSU-CNT, respectively.

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Section: Resultsmentioning

confidence: 84%

Influence of extrusion parameters on filled polyphenylsulfone tufting yarns on open-hole tensile strength

McGarrigle

Wegrzyn

Han

et al. 2022

Journal of Reinforced Plastics and Composites

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“…Various methods have been studied to counteract delamination issues, however, the most common methods involve either fiber stitching [1][2][3] or nanoparticle reinforcements [4][5][6][7][8][9][10][11][12][13], which can be subdivided into interleaving and direct matrix dispersion approaches. Fiber stitching is costly and difficult for complex and large CFRP part manufacturing, thus its applications are constrained by part-size, complexity, and budget.…”

Section: Background and Previous Workmentioning

confidence: 99%

“…Moreover, the stitching needles can break and interrupt the carbon fiber reinforcement, thereby reducing the CFRP's compressive strength in the x-y plane, particularly under hygrothermal conditions [3]. Therefore, the improvements in interlaminar fracture toughness provided by fiber stitching also cause the reduction in other critical material properties.…”

Section: Background and Previous Workmentioning

confidence: 99%

Effect of carbon nanofiber z-threads on mode-I delamination toughness of carbon fiber reinforced plastic laminates

Hsiao

Scruggs

Brewer

et al. 2016

Composites Part A: Applied Science and Manufacturing

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Delamination is a major drawback of carbon fiber reinforced plastics (CFRPs). Studies have reported that carbon nanofibers (CNFs) can improve the delamination toughness of various FRPs. However, lack of CNF alignment control caused substantial uncertainty in the improvements. In this study, a novel CNFs z-threaded CFRP (ZT-CFRP), which utilized z-aligned CNFs as long-range reinforcement threading through the packed carbon fiber bed, was manufactured. The mode-I delamination toughness (G IC) of the ZT-CFRPs was tested against both control CFRPs and unaligned CNF-modified CFRPs (UA-CFRPs). Through statistical comparison against control CFRPs, UA-CFRPs exhibited a relative change in mean G IC and coefficient of variation of +13.99% and +116.35%, respectively, whereas the ZT-CFRPs of equivalent CNF concentration exhibited a relative change in mean G IC and coefficient of variation of +28.93% and-12.33%, respectively. Accordingly, the CNF z-threads were found to play a positive role in toughening CFRPs, as supported by delamination experiments and microscopy analysis.

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“…This paper aims to investigate the laws of deformation and failure of layered CFRP, reinforced with multidirectional fibers , not only at room temperature (RT), but also at low (–54°C) and high (71°C) temperatures . Its purpose is to develop a numerical approach as support of traditional tests, able to estimate the mechanical properties of many CFRP materials only by varying some parameters in a simplified numerical model: percentage of each component, number of plies and fiber's orientation .…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of carbon fiber reinforced plastics specimens for aerospace applications

Barile

Casavola

2018

Polymer Composites

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The use of new Composites Fibers Reinforced Plastics materials for structural applications in aerospace industry is fast increasing in the last years. Ensuring high performances requires a deep knowledge of the mechanical behavior of the composite components subjected to different workloads. Components are subjected to strict environmental conditions that are typical of flight settings, as cold temperature and/or elevated temperature close to engines. In the typical assembly of composites, multiple layers are stacked together with a given sequence. Layers could be organized with different angles, different sequences and different technological process for providing specific mechanical properties that need to be studied. The possibility to introduce new parameters, able to improve mechanical properties of composites is also investigated. It refers to an unconventional fibers orientation combined with the through‐the‐thickness stitching on the in‐plane mechanical properties of composites. Conventional carbon fibers orientation is generally referred to a Cartesian coordinate system, in which fibers are arranging in bundles along different angle orientations respect to the zero lamina. The opportunity to use a polar coordinate system of continues carbon tow is introduced to create specimens as well as complex geometry components easily. The application of this technique aims to introduce some advantages in the material's manufacturing process and if compared with the conventional strategy seems to be very promising since it appears to be very efficient in stopping delamination phenomenon. POLYM. COMPOS., 40:716–722, 2019. © 2018 Society of Plastics Engineers

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Effect of Stitching on Plain and Open-hole Strength of CFRP Laminates

Cited by 16 publications

References 15 publications

Influence of extrusion parameters on filled polyphenylsulfone tufting yarns on open-hole tensile strength

Influence of extrusion parameters on filled polyphenylsulfone tufting yarns on open-hole tensile strength

Effect of carbon nanofiber z-threads on mode-I delamination toughness of carbon fiber reinforced plastic laminates

Mechanical characterization of carbon fiber reinforced plastics specimens for aerospace applications

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