Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"fibre orientation"”.
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Smart passive adaptive control of laminated composite plates (through optimisation of fibre orientation)
… normally consists of two materials; matrix and fibres. Fibres can be embedded in different orientations in composite lay-ups. In this research, laminated composite models subject to transfer shear effect are studied. A semi analytical model based on Newton-Kantorovich-Quadrature Method is …
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Fibre Orientation and Breakage in Glass Fibre Reinforced Polymer Composite Systems: Experimental Validation of Models for Injection Mouldings. Validation of Short and Long Fibre Prediction Models within Autodesk Simulation Moldflow Insight 2014
… analysis techniques are used to measure the orientation and length of injection moulded short and long fibres composite components. The fibre orientation distribution (FOD) measurements for both geometries have been taken along the flow path. In shear flow the FOD changes along the flow path, …
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Static and Dynamic Characterisation of Flax Fibre-reinforced Polypropylene Composites
This work investigates the effects of fibre content and fibre orientation on the mechanical performances of flax fibre-reinforced polypropylene composites (FFPCs) along with fracture characteristics, particularly for unidirectional (UD) beam-like specimens. This work also investigates the effects …
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Fibre Microstructure and Mechanics of Atherosclerotic Plaques
… and rupture risk of atherosclerotic plaques. Fibre structures in human atherosclerotic plaques were characterised through scanning electron microscopy, histology, and image processing. Local primary fibre orientation and the fibre dispersion were calculated. Plaque shoulder regions, where …
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An investigation into the effect of licker-in design on carding performance
… The main purpose of carding is to individualise fibres thoroughly so that they can be spun into yarns. Therefore, the quality of the yarns spun and the quality of fabrics produced from them is largely determined by the effectiveness of the carding process. The design of the licker-in zone …
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The orientation state of semi-dilute rigid fibre suspensions in a linearly contracting channel
… the effects of long range hydrodynamic fibre-fibre interactions on the orientation state of a semi-dilute, rigid fibre suspension flowing through a linear contracting channel under laminar flow conditions. The effects of fibre-fibre interactions are modeled mathematically, the governing …
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Bio-composites materials from engineered natural fibres for structural applications
… footprint caused by conventional synthetic fibre reinforced petrochemical-derived polymer composites along with potential improvement in mechanical properties for natural fibre reinforced bio-derived polymer composites, have long been a motivation for further research and innovation in …
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Finite element modelling and analysis of composite flywheel disk including effects of filament-winding mosaic pattern
… disk are reinforced with radially varying fibre trajectories that result in continuous changes in fibre orientation angles which generate stiffness variations and composite laminates with such stiffness variations are called variable-stiffness laminates. Thus, varying fibre trajectories …
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Verarbeitung von langfaserverstärkten Thermoplasten im direkten Plastifizier-, Pressverfahren
… materials in the form of powder, chopped glass-fibres and additives in a single-screw plastification unit is examined in this work. By using the material combination glass/polypropylene, the influence of the process parameters on the properties of the long-fibre reinforced press masses is …
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Developing new multiscale models for the numerical simulation of Pultruded GFRP Structural Elements
Pultruded Fibre-Reinforced Polymers (FRP) are innovative structural elements gaining popularity for various structural applications due to their unique properties, such as magnetic transparency and an excellent strength-to-weight ratio. These materials have been extensively studied through …
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ASPECTS OF RECYCLING OF CARBON FIBRE REINFORCED POLYETHERETHERKETONE (CF/PEEK)
This study focused on the recycling of the carbon fibre reinforced polyetheretherketone (CF/PEEK) composite, as it is an expensive material worth recycling. In its virgin form, CF/PEEK has excellent mechanical properties. Thus it is hoped that even after recycling, the extent of degradation to its …
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Flexural Behaviour of Steel Fibre Reinforced Concrete Tunnel Linings
The promotion of steel fibre reinforced concrete (SFRC) as a construction material for tunnel linings has prompted a number of researchers to focus on methods of evaluating their flexural strength and stiffness. This thesis presents the results of an experimental and numerical investigation of the …
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Differences in strength between the grain and corium layers of bovine leather
… to fracture is attributed to the processes of fibre debonding and pull out. The viscoelastic nature of grain and corium material was investigated by examining differences in strength and toughness over a range of deformation rates. The ultimate tensile properties and the specific work of …
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The compounding of short fibre reinforced thermoplastic composites
… accepted that the mechanical properties of short fibre reinforced thermoplastics do not correspond with the high mechanical properties of fibres used to reinforce them. A study is made into the methods of compounding reinforcing fibres into thermoplastics to produce short fibre reinforced …
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Hypertrophic scar tissue : its microstructure and mechanical properties and the effects of pressure therapy
… has been established. Abnormalities in collagen fibre size and packing arrangement, together with abnormally large diameter - blood vessels and excessive numbers of fibroblasts have been observed. A motor driven, rotary biopsy punch, for obtaining undistorted, full thickness cores of scar tissue …
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Residual stress determination in advanced silicon carbide fibre reinforced aluminium matrix composites
… those that are reinforced by long continuous fibres (such as carbon, alumina, silicon, boron and carbide) or those reinforced by discontinuous fibres (particulates). The addition of fibres and particulates reinforcements enhance desirable properties of the base metal (matrix). A key benefit of …
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Existence and stability of solutions to the equations of fibre suspension flows
… the initial-boundary value problem for fibre suspension flows is that in which fibre orientation is accounted for in an averaged sense, through the introduction of a second-order orientation tensor A. This variable, together with the velocity and pressure, then constitutes the set of …
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An investigation of the failure mechanisms of thermoplastic composites at various rates of strain and temperatures
… polypropylene and polyamide resins with glass fibres and talc as fillers. These materials were provided by PLASTAMID (pty) ltd. The injection moulded specimens of polypropylene, polyamide 6-6, 30% talc filled polypropylene, 30% short glass fibre reinforced polypropylene and 30% short glass …
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Improving the performance of polypropylene matrix composite materials using engineered hemp fibre mats
… found within the spectrum of natural fibre composites, has led to increased interest in improving these sustainable materials. Although the use of natural fibre composite materials has been documented in early civilisations, growing environmental concerns coupled with technological …
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Fibrous Microstructure and Biomechanics of Healthy and Diseased Aortic Tissues
… approaches. Firstly, collagen and elastin fibre parameters of human aortic dissection flaps were extracted from histology slides. Their material properties and relationships with fibrous parameters were also studied. Secondly, a computational framework based on the unsupervised deep …
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