Analysis of fibre orientation distribution in short fibre reinforced polymers: A comparison between optical and tomographic methods

Bernasconi, A.; Cosmi, Francesca; Hine, P. J.

doi:10.1016/j.compscitech.2012.08.018

Cited by 103 publications

(55 citation statements)

References 19 publications

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“…In one layout, the specimen was injected through a film gate located on the top face of the specimen in order to induce a longitudinal melt flow during cavity filling. The use of this feed system, as reported in [15] and successively confirmed in [16], resulted in a symmetric fiber orientation distribution that was predominantly longitudinal. In the other one, a side gate located on a lateral face of the specimen induced asymmetric filling of the specimen cavity, causing a less homogeneous fiber orientation distribution.…”

Section: Mechanical Testingmentioning

confidence: 51%

An experimental investigation of the combined influence of notch size and fibre orientation on the fatigue strength of a short glass fibre reinforced polyamide 6

2015

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Section: Mechanical Testingmentioning

confidence: 51%

An experimental investigation of the combined influence of notch size and fibre orientation on the fatigue strength of a short glass fibre reinforced polyamide 6

2015

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“…clusters of tow-ends, resin pockets or voids) in TBDCs, which leads to notch insensitivity [16]. These characteristics are also shared by other classes of Discontinuous Fibre-Composites (DFCs) [17][18][19], although the macroscopic effect of the heterogeneous microstructure is reduced in the latter as the fibres are more dispersed in DFCs than in TBDCs.…”

Section: Introductionmentioning

confidence: 90%

Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

Pimenta

Singgih

et al. 2017

Composites Part A: Applied Science and Manufacturing

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The equivalent laminate assumption is a commonly-used method to model the random architecture of discontinuous composites, but which has never been validated experimentally. This study aims to verify the equivalent laminate assumption, focusing on tow-based discontinuous composites (TBDCs), which have higher fibre-content and thus improved modulus and strength, compared to conventional discontinuous-fibre composites. This verification was achieved by manufacturing and testing (i) actual TBDCs with randomly oriented tows and (ii) their equivalent laminates (ELs), at two different tow thicknesses. The results show that ELs exhibit the same failure mechanisms as TBDCs, and are similarly weakened by an increase in tow thickness. However, ELs lack the spatial variability in local fibre-content and local tow orientations, which makes ELs stronger than TBDCs. Therefore, the equivalent laminate assumption is suitable for predicting the modulus of discontinuous composites, but cannot predict their strength without considering the local variability in their microstructure.

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“…In terms of the orientation distribution and the angle pair ( , ), the tensor components can be calculated as follows [17] The diagonal components of the second order orientation tensor (a11, a22 and a33) describe the degree of orientation with respect to the defined coordinate system. Conventionally, the reference coordinates are defined so that the 1-direction represents the in-flow direction, the 2-direction is the crossflow direction and the 3-direction is the thickness direction.…”

Section: Fiber Orientation Analysis Using Microcomputed Tomographymentioning

confidence: 99%

“…)ψ(p) dp denotes an integral over all possible fiber orientations. In terms of the orientation distribution and the angle pair (θ, φ), the tensor components can be calculated as follows [17]:…”

Section: Fiber Orientation Analysis Using Microcomputed Tomographymentioning

confidence: 99%

Process-Induced Fiber Orientation in Fused Filament Fabrication

et al. 2018

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Abstract:As the applications for additive manufacturing have continued to grow, so too has the range of available materials, with more functional or better performing materials constantly under development. This work characterizes a copper-filled polyamide 6 (PA6) thermoplastic composite designed to enhance the thermal conductivity of fused filament fabrication (FFF) parts, especially for heat transfer applications. The composite was mixed and extruded into filament using twin screw extrusion. Because the fiber orientation within the material governs the thermal conductivity of the material, the orientation was measured in the filament, through the nozzle, and in printed parts using micro-computed tomography. The thermal conductivity of the material was measured and achieved 4.95, 2.38, and 0.75 W/(m·K) at 70 • C in the inflow, crossflow, and thickness directions, respectively. The implications of this anisotropy are discussed using the example of an airto-water crossflow heat exchanger. The lower conductivity in the crossflow direction reduces thermal performance due to the orientation in thin-walled parts.

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Analysis of fibre orientation distribution in short fibre reinforced polymers: A comparison between optical and tomographic methods

Cited by 103 publications

References 19 publications

An experimental investigation of the combined influence of notch size and fibre orientation on the fatigue strength of a short glass fibre reinforced polyamide 6

An experimental investigation of the combined influence of notch size and fibre orientation on the fatigue strength of a short glass fibre reinforced polyamide 6

Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

Process-Induced Fiber Orientation in Fused Filament Fabrication

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