Short Fiber orientation and its Effects on the Properties of Thermoplastic Composite Materials

McNally, Donal

doi:10.1080/03602557708545033

Cited by 63 publications

(13 citation statements)

References 22 publications

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“…For test specimen of position L2 and L3 the portion of oriented glass fibers in flow direction decreases, which is especially recognizable in the core area. This is supported by the investigations of McNally [29] and Toll and Anderson [30], which have found a transverse in-plane orientation of the glass fibers to the flow direction of injection molded plates in the core area. The position-dependent glass fiber orientation influences mechanical properties like the tensile strength σM or the modulus of elasticity Et.…”

Section: Resultssupporting

confidence: 64%

Influence of Hygrothermal Aging on Poisson’s Ratio of Thin Injection-Molded Short Glass Fiber-Reinforced PA6

Illing

Gotzig

Schoßig³

et al. 2016

Fibers

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Abstract:The hygrothermal aging of short glass fiber-reinforced polyamide 6 materials (PA6 GF) represents a major problem, especially in thin-walled components, such as in the automotive sector. In this study, therefore, the thickness and the glass fiber content of PA6 GF materials were varied and the materials were exposed to hygrothermal aging. The temperature and relative humidity were selected in the range from´40˝C up to 85˝C, and from 10% up to 85% relative humidity (RH). In the dry-as-molded state, the determined Poisson's ratio of the PA6 GF materials was correlated with the fiber orientation based on computer tomography (MicroCT) data and shows a linear dependence with respect to the fiber orientation along and transverse to the flow direction of the injection molding process. With hygrothermal aging, the value of Poisson's ratio increases in the flow direction in the same way as it decreases perpendicular to the flow direction due to water absorption.

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Section: Resultssupporting

confidence: 64%

Influence of Hygrothermal Aging on Poisson’s Ratio of Thin Injection-Molded Short Glass Fiber-Reinforced PA6

Illing

Gotzig

Schoßig³

et al. 2016

Fibers

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“…It has been found that short fiber reinforcements can generally improve mechanical properties of polymer composites and they have been widely used and studied for a long time. [1][2][3][4][5] Short fiberreinforced polymer (SFRP) composites are very attractive for industrial applications because of their ease of fabrication, cost and superior mechanical properties. 6 Carbon fibers (CF) are widely used in polymer matrix composites, since they provide strong, stiff and low density reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Effects of initial fiber length and fiber length distribution on the properties of carbon-fiber-reinforced-polypropylene composites

Karsli

Aytaç

Deniz

2012

Journal of Reinforced Plastics and Composites

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In this study, short carbon fiber-reinforced polypropylene composites with three different initial carbon fiber lengths were prepared by using extrusion compounding and injection molding techniques. The physical and morphological properties of the prepared short carbon fiber-reinforced composites were investigated by means of tensile test, differential scanning calorimetry and scanning electron microscopy. Final fiber length distributions of composites were also determined by using an image analyzing program. It was found that the maximum number of fibers was observed in the range from 51 to 100 mm. Number average final fiber lengths were calculated between 230 and 280 mm. Regardless of the used initial carbon fiber length, tensile strength and modulus values of the composites increased with the increasing carbon fiber content. It has been concluded that the initial fiber length at the studied range did not have any significant effect on the properties of composites.

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“…A central region can be identified at y / H = 0-0.3 at the center of which around 30% of rigid rods are aligned perpendicular to the flow direction (0 = 78-102"), which was not observed in the other layers, whereas other orientations are also observed. A higher degree of orientation transverse to the flow direction is expected (40) at the centerline because of previous divergent flow through the gate, although it is noticeably reduced, leading to a randomized central orientation, resulting from the convergent flow that follows the divergent flow (40,41) in tensile test specimens.…”

Section: Resultsmentioning

confidence: 99%

“…In short-fiber composites, regions of varying fiber orientation exist without really any distinct boundaries. A greater number of such regions exist in plaques, which do not include any convergence parts in their geometry (40). A higher degree of fiber orientation across the thickness is observed in tensile test bars after the fibers have passed the part of convergent flow (40).…”

Section: Resultsmentioning

confidence: 99%

“…A greater number of such regions exist in plaques, which do not include any convergence parts in their geometry (40). A higher degree of fiber orientation across the thickness is observed in tensile test bars after the fibers have passed the part of convergent flow (40). The number of distinct orientation layers in LCPs has been reported (5) to be affected by the molding thickness.…”

Section: Resultsmentioning

confidence: 99%

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Mathematical modeling and computer simulations of the flow, nematic phase orientation, and heat transfer in thermotropic liquid crystalline polymers

Lekakou

1997

Polymer Engineering & Sci

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This study includes a mathematical analysis and computer simulations of the injection molding of thermotropic liquid crystalline polymers (LCPs). The particular area of interest is the modeling and numerical evaluation of the orientation of the rigid rods in the nematic phase of LCPs during the filling stage of injection molding. The model is based on a continuum mechanics approach in order to derive the orientation distribution function of rigid rods for different orientation angles. Numerical distributions of average orientation factors are also derived. Computer simulations have been conducted in case studies that investigate the effects of changes in the processing conditions.

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Short Fiber orientation and its Effects on the Properties of Thermoplastic Composite Materials

Cited by 63 publications

References 22 publications

Influence of Hygrothermal Aging on Poisson’s Ratio of Thin Injection-Molded Short Glass Fiber-Reinforced PA6

Influence of Hygrothermal Aging on Poisson’s Ratio of Thin Injection-Molded Short Glass Fiber-Reinforced PA6

Effects of initial fiber length and fiber length distribution on the properties of carbon-fiber-reinforced-polypropylene composites

Mathematical modeling and computer simulations of the flow, nematic phase orientation, and heat transfer in thermotropic liquid crystalline polymers

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