Journal ArticleDOI
The influence of void content on the structural flexural performance of unidirectional glass fibre reinforced polypropylene composites
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TLDR
In this article, the influence of void content on the flexural properties of beams manufactured by compression molding multiple unidirectional commingled glass/polypropylene fiber tows was evaluated.Abstract:
Voids are often present in composite materials and have, as may be expected, negative effects on the mechanical properties. As a consequence, it is regarded to be important to optimise manufacturing techniques of composite materials towards minimum void content. However, it is not obvious that voids also have negative effects on the properties of a structure since those are not just determined by the properties of the material, but also by the dimensions. For a given mass of material, void will increase the dimensions and as a result, for example, the moment of inertia. Thus in principle, it is possible that void may actually have positive effects on the properties of a structure. In this paper this hypothesis is evaluated by studying the influence of void content on the flexural properties of beams manufactured by compression moulding multiple unidirectional commingled glass/polypropylene fibre tows. By varying the time under moulding pressure, beams with void contents between 1 and 14% could be manufactured (with the mass, width and length fixed, and thus only the height free). As expected, voids were found to have a negative effect on the flexural modulus and strength, which both decreased by about 1.5% for each 1% of voids. However, what is more interesting is the fact that voids actually had a clear positive effect on the beam stiffness EI ; which increased by about 2% for each 1% of voids. For example, beams which contained 14% porosity exhibited about 28% higher EI than beams with less than 1% porosity. Moreover, the flexural failure load did not decrease up to a void content of 14%. On the contrary, a least square fit suggested a weak increase with void content. It can therefore be concluded that, in this case, voids actually have positive effects on the structural flexural performance.read more
Citations
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Journal ArticleDOI
Critical factors on manufacturing processes of natural fibre composites
TL;DR: In this article, different manufacturing processes and their suitability for natural fibre composites, based on the materials, mechanical and thermal properties of the fibres and matrices are discussed in detail.
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Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance:
TL;DR: In this article, the most studied type of manufacturing defects, voids, form very often in processing of fiber-reinforced composites and have a considerable influence on physical and thermomechanical properties.
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Effect of fibre orientations on the mechanical properties of kenaf–aramid hybrid composites for spall-liner application
TL;DR: In this paper, the effect of kenaf fiber orientation on the mechanical properties of Kenaf-aramid hybrid composites for military vehicle's spall liner application is presented.
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Mechanical and dry sliding wear characterization of epoxy–TiO2 particulate filled functionally graded composites materials using Taguchi design of experiment
TL;DR: In this article, the effect of various operational variables, material parameters and their interactive influences on specific wear behavior of TiO 2 reinforced homogeneous epoxy composites has been studied systematically.
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Measurement of voids in composites by X-ray Computed Tomography
TL;DR: In this paper, the authors proposed a new method of quantifying porosity/void dimensions in composites and discussed methods to minimize errors in void detection and measurement using X-ray Computed Micro-Tomography.
References
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Book ChapterDOI
Introduction To Composite Materials
TL;DR: The combination of materials to form a new material system with enhanced material properties is a well documented historical fact as discussed by the authors, which is why many artisans from the Mediterranean and Far East used a form of composite technology in molding art works which were fabricated by layering cut paper in various sizes for producing desired shapes and contours.
Book
An Introduction to Composite Materials
Derek Hull,T.W. Clyne +1 more
TL;DR: The authors provides both scientists and engineers with all the information they need to understand composite materials, covering their underlying science and technological usage, including surface coatings, highly porous materials, bio-composites and nano-com composites, as well as thoroughly revised chapters on fibres and matrices.
Journal ArticleDOI
Manufacturing of Thermoplastic Composites from Commingled Yarns-A Review:
TL;DR: The use of commingled yarns is one of the more promising routes for producing structural thermoplastic composites as discussed by the authors, and the textile processes available enable faster manufacturing and tailoring of the fiber architecture of preforms.
Journal ArticleDOI
Effect of voids on failure mechanisms in RTM laminates
TL;DR: In this paper, the effect of voids on the mechanisms of transverse failure was investigated for predominantly unidirectional resin transfer moulded laminates of glass-fibre-fabric/vinylester.
Journal ArticleDOI
Compression moulding of glass and polypropylene composites for optimised macro- and micro- mechanical properties - 1. commingled glass and polypropylene
TL;DR: In this article, a non-isothermal processing of commingled fabrics which were woven from yarns of intimately mingled glass and polypropylene fibres was used to predict laminate properties.
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