Effect of Longitudinal Splitting on Tensile Strength of Unidirectional Aramid Fiber Reinforced Plastics

Puchkov, L. V.; Баженов, С. Л.

doi:10.1177/002199839202601001

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…The tensile strength in the fiber direction (0 • ) is shown in Figure 5c, compared to published strengths for traditional aramid/epoxy composites [40,48,49]. While the strength is lower than what can be achieved with traditional composites, the published results show that this can largely be caused by the presence of voids surrounding the fibers and a lack of optimized fiber sizing [49,51,52].…”

Section: Tensile Testingmentioning

confidence: 95%

“…(c) The tensile strength of UD 0 • printed aramid/PETG composites increases linearly with added fiber volume content. Comparison to traditional aramid/epoxy composites shows lower-than-expected strength, and results from literature show that the lack of sizing can cause this drop [40,48,49]. (d) The tensile strength of UD 90 • printed aramid/PETG composites compared to a non-reinforced 3D-printed PETG sample.…”

Section: Tensile Testingmentioning

confidence: 99%

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Continuous Fiber-Reinforced Aramid/PETG 3D-Printed Composites with High Fiber Loading through Fused Filament Fabrication

et al. 2022

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Recent development in the field of additive manufacturing, also known as three-dimensional (3D) printing, has allowed for the incorporation of continuous fiber reinforcement into 3D-printed polymer parts. These fiber reinforcements allow for the improvement of the mechanical properties, but compared to traditionally produced composite materials, the fiber volume fraction often remains low. This study aims to evaluate the in-nozzle impregnation of continuous aramid fiber reinforcement with glycol-modified polyethylene terephthalate (PETG) using a modified, low-cost, tabletop 3D printer. We analyze how dimensional printing parameters such as layer height and line width affect the fiber volume fraction and fiber dispersion in printed composites. By varying these parameters, unidirectional specimens are printed that have an inner structure going from an array-like to a continuous layered-like structure with fiber loading between 20 and 45 vol%. The inner structure was analyzed by optical microscopy and Computed Tomography (µCT), achieving new insights into the structural composition of printed composites. The printed composites show good fiber alignment and the tensile modulus in the fiber direction increased from 2.2 GPa (non-reinforced) to 33 GPa (45 vol%), while the flexural modulus in the fiber direction increased from 1.6 GPa (non-reinforced) to 27 GPa (45 vol%). The continuous 3D reinforced specimens have quality and properties in the range of traditional composite materials produced by hand lay-up techniques, far exceeding the performance of typical bulk 3D-printed polymers. Hence, this technique has potential for the low-cost additive manufacturing of small, intricate parts with substantial mechanical performance, or parts of which only a small number is needed.

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Section: Tensile Testingmentioning

confidence: 95%

Section: Tensile Testingmentioning

confidence: 99%

Continuous Fiber-Reinforced Aramid/PETG 3D-Printed Composites with High Fiber Loading through Fused Filament Fabrication

et al. 2022

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“…35 In the third step, isolated, multiple carbon fiber fractures and longitudinal splitting events connect, resulting in final fracture of the CFRP in the fourth step. 37,38 Thus, transverse compressive stress can influence the fracture behavior of a CFRP. Transverse compressive stress is calculated in the following section to predict the mechanical behavior of CFRP/steel hybrid laminates.…”

Section: Modeling Approachmentioning

confidence: 99%

A micromechanical model of carbon fiber-reinforced plastic and steel hybrid laminate composites

Sung

Ahn

Jang

et al. 2021

Journal of Composite Materials

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The fracture strain of carbon fiber-reinforced plastics (CFRPs) within CFRP/steel hybrid laminate composites is reportedly higher than that of CFRPs due to transverse compressive stress induced by the steel lamina. A micromechanical model was developed to explain this phenomenon and also to predict the mechanical behavior of CFRP/steel hybrid laminate composites. First, the shear lag theory was extended to calculate stress distributions on fibers and matrix material in a CFRP under multiaxial stress condition, considering three deformation states of matrix (elastic and plastic deformation and fracture) and the transverse compressive stress. Then, the deformation behavior of CFRP was predicted using average stress in the ineffective region and the Weibull distribution of carbon fibers. Finally, the mechanical properties of CFRP/steel hybrid laminate composites were predicted by considering the thermal residual stress generated during the manufacturing process. The micromechanical model revealed that increased transverse compressive stress decreases the ineffective lengths of partially broken fibers in the CFRP and results in increased fracture strain of the CFRP, demonstrating the validity of the current micromechanical model.

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“…Work by Kortschot et al [6] on notched crossply CFRP laminates indicated a similar relationship for split growth and that split length/notch length ratio was proportional to the square of the applied stress. Whilst the resistance of carbon [3] and glass [7] FRP composites to splitting along the fibres is similar for static loading the behaviour of aramid fibre composites appears to be controlled by different mechanisms [8].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Two‐stage Loading on the Longitudinal Splitting of Unidirectional Carbon/Epoxy Laminates

Found

Kanyanga

1996

Fatigue Fract Eng Mat Struct

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A review of variable fatigue loading of carbon fibre/epoxy laminates indicates that for twostage loading, low-to-high loading is generally more damaging than high-to-low loading. Damage accumulation under two-stage loading appears to produce linear damage in some CFRP materials and non-linear behaviour in others. The behaviour of those materials exhibiting linear damage may be predicted by the Palmgren-Miner rule. A model is presented for determining the longitudinal split growth in notched unidirectional carbon fibre/epoxy test coupons. The model is able to predict the non-linear split growth for low-to-high loading whilst the linear damage accumulation for high-to-low loading may best be determined by use of the Palmgren-Miner rule. NOMENCLATURE a = half crack length A,B = constants in fatigue model B, = static split growth constant Ds = split length (see Fig. 1) D,,DtDhtD,, = split length for high, low, high-low and low-high stress loading respectively H, = static split initiation constant N = number of cycles No = number of cycles for split initiation N, = total number of cycles NhrNt,Nht,Nth = number of cycles for high, low, high-low and low-high stress loading respectively R = stress ratio (u-/umX) 7 = cycle ratio (N,/N,) u = applied stress u, = high stress ut = low stress us = static split initiation stress umax = maximum fatigue stress

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Effect of Longitudinal Splitting on Tensile Strength of Unidirectional Aramid Fiber Reinforced Plastics

Cited by 6 publications

References 21 publications

Continuous Fiber-Reinforced Aramid/PETG 3D-Printed Composites with High Fiber Loading through Fused Filament Fabrication

Continuous Fiber-Reinforced Aramid/PETG 3D-Printed Composites with High Fiber Loading through Fused Filament Fabrication

A micromechanical model of carbon fiber-reinforced plastic and steel hybrid laminate composites

The Influence of Two‐stage Loading on the Longitudinal Splitting of Unidirectional Carbon/Epoxy Laminates

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