Dissertations / Theses on the topic 'Discontinuous fiber composites'
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Kunc, Vlastimil. "Structure-property relationships in flow formed discontinuous fiber reinforced composites." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52934.
Full textPh. D.
Dibelka, Jessica Anne. "Mechanics of Hybrid Metal Matrix Composites." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50579.
Full textPh. D.
Lu, Yunkai. "Mechanical Properties of Random Discontinuous Fiber Composites Manufactured from Wetlay Process." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34503.
Full textMaster of Science
Suwatnodom, Prechaporn. "3-D micromechanical damage models, fiber pullout models and fracture toughness of discontinuous steel fiber reinforced cementitious composites." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1562125051&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textHarper, Lee Thomas. "Discontinuous carbon fibre composites for automotive applications." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10246/.
Full textQian, Connie Cheng. "Structural optimisation of discontinuous carbon fibre composites." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14542/.
Full textBond, Michael David. "Multi-scale modelling of discontinuous carbon fibre reinforced composites." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28879/.
Full textLopez, Delphine. "Comportement d’un thermoplastique renforcé de fibres de verre soumis à des chargements thermo-mécaniques." Thesis, Lorient, 2018. http://www.theses.fr/2018LORIS488/document.
Full textDiscontinuous fibers reinforced thermoplastic materials have been widely used for several years in the automotive industry. These parts must resist demanding service life conditions and must meet thermo- mechanical specifications. Indeed, structural automotive spare parts have to endure high temperatures, like a few tens of degrees Celsius, for a long duration, at least a few hours. As an example, a structural part of tailgate is subject to high mechanical loading, associated to strong temperature variations, during the validation test, regarding specifications. The purpose of this work is to improve the design of complex industrial parts, like the tailgate in quasi-static domain, by relying on numerical simulation. One of the challenges related to the use of such material, is to have a reliable virtual design of industrial parts by predicting the geometrical variations during service life conditions, and residual strain. Therefore, it is necessary to characterize and to model the thermo-mechanical behavior of the tailgate material, a polypropylene matrix reinforced with discontinuous glass fibers, with a given mass fraction of 40%
Poumadère, Thomas. "Etude du couplage procédé/propriétés d’un matériau à fibres discontinues de carbone et à matrice époxy mis en oeuvre par un procédé innovant d’injection/transfert." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0003.
Full textComposite materials are widely used in aeronautics. Their high mechanical properties combined to their lightness make it possible for thern to compete With metallic materials. However mass production of complex 3D shape composite structural parts is not usual.Injection process of short fibers (100um à 1 mm) filted thermoplastics is well known. Nevertheless there are few studies about long fibers (>1 mm) filled thermosets. It is very difficult to make the material flow into a closed mold.Equip iAéro Technique carried out research on the deve(opment of a new injection-transfer process (called PIMOC) to manufacture long discontinuous fibers filled thermoset composites. This process makes it possible to produce one shot complex 3D shape parts without machining.ln this work, the injection-transfer process has been developed and is now reliable. Its main parameters have been identified. The influence of manufacuring parameters on material properties have been determined, Thus mechanical properties have been optimizecl. Finally an elastic damage model has been devetoped in order to introduce a methodology or sizing discontinuous fibers composite parts. The model includes failure and is based on a multi-criteria approach. Theses damage and failure criteria have been deveioped according to observations of material mechanical behavior. Experimental and numerical results have been applied for sizing and manufacturing a technical demonstrator
Nicholls, Tristan Kit. "Adhesive bonding of discontinuous carbon fibre composites : an experimental investigation." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13773/.
Full textBurn, David T. "Long discontinuous carbon fibre/polypropylene composites for high volume automotive applications." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33665/.
Full textXiao, Zhaofei. "Advancements in discontinuous carbon fibre composite technologies for high-volume manufacturing processes." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/51942/.
Full textFengler, Benedikt [Verfasser]. "Manufacturing-constrained multi-objective optimization of local patch reinforcements for discontinuous fiber reinforced composite parts / Benedikt Fengler." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1176022628/34.
Full textFengler, Benedikt [Verfasser]. "Manufacturing-constrained multi-objective optimization of local patch reinforcements for discontinuous fiber reinforced composite parts / Benedikt Fengler." Karlsruhe : KIT Scientific Publishing, 2021. http://d-nb.info/1229623698/34.
Full textGadoury, Pascal. "Finite Element Modeling and Multivariate Optimization Over Fibre Orientation and Volume Fraction of Fibre Composite Parts Aimed at Minimizing Targeted Displacements." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26122.
Full textLin, Shih Hsiung, and 林世雄. "Research on the characteristics of continuous and discontinuous fiber reinforced composites." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/29634415335998292376.
Full text(8780756), Imad A. Hanhan. "Investigating damage in discontinuous fiber composites through coupled in-situ X-ray tomography experiments and simulations." Thesis, 2020.
Find full textComposite materials have become widely used in engineering applications, in order to reduce the overall weight of structures while retaining their required strength. Due to their light weight, relatively high stiffness properties, and formability into complex shapes, discontinuous fiber composites are advantageous for producing small and medium size components. However, qualifying their mechanical properties can be expensive, and therefore there is a need to improve predictive capabilities to help reduce the overall cost of large scale testing. To address this challenge, a composite material consisting of discontinuous glass fibers in a polypropylene matrix is studied at the microstructural level through coupled experiments and simulations, in order to uncover the mechanisms that cause microvoids to initiate and progress, as well as certain fiber breakage events to occur, during macroscopic tension. Specifically, this work coupled in-situ X-ray micro computed tomography (μ-CT) experiments with a finite element simulation of the exact microstructure to enable a 3D study that tracked damage initiation and propagation, and computed the local stresses and strains in the microstructure. In order to have a comprehensive 3D understanding of the evolution of the microstructure, high fidelity characterization procedures were developed and applied to the μ-CT images in order to understand the exact morphology of the microstructure. To aid in this process, ModLayer - an interactive image processing tool - was created as a MATLAB executable, and the 3D microstructural feature detection techniques were compared to traditional destructive optical microscopy techniques. For damage initiation, this work showed how high hydrostatic stresses in the matrix can be used as a metric to explain and predict the exact locations of microvoid nucleation within the composite’s microstructure. From a damage propagation standpoint, matrix cracking - a mechanism that has been notably difficult to predict because of its apparent stochastic nature - was studied during damage propagation. The analysis revealed the role of shear stress in fiber mediated flat matrix cracking, and the role of hydrostatic stress in fiber-avoidance conoidal matrix cracking. Overall, a sub-fiber simulation and an in-situ experimental analysis provided the microstructural physical phenomena that govern certain damage initiation and progression mechanisms, further enabling the strength and failure predictions of short fiber thermoplastic composites.
(11201085), Ronald F. Agyei. "INVESTIGATING DAMAGE IN SHORT FIBER REINFORCED COMPOSITES." Thesis, 2021.
Find full textJuang, Jia-Hao, and 江家豪. "Investigation on Mechanical Properties and Fracture Behavior by Nanoscale Graphene Discontinuous Carbon Fiber Reinforced Copolymer (Epoxy/Benzoxazine) Composite." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/k9985k.
Full text國立清華大學
動力機械工程學系
103
This study is focuses on the characteristics of the benzoxazine/epoxy copolymer matrix, combined thegraphene and micro-scale short carbon fibers to be reinforcement. In order to investigate the reinforced mechanism of the nano-scale and micro-scale additive, the interfacial properties, mechanical behavior, and fatigue failure would be realized on the mulit-scale reinforced composite. The researches includes: (1) Different contents of benzoxazine resin in Epoxy resin, (2) graphene and Micro-scale short carbon fibers concentration, (3) the interaction of multi-scale reinforcement material concentration This research aims to discuss the effect of the mixture of nano-scale graphene and micro-scale short carbon fiber, notably intensifies the the mixture of multi-scale interface, improving and increasing both mechanical properties and dynamic fatigue life. The investigation includes:(1)Different Benzoxazine resin concentration in Epoxy,(2)Nano-scale graphene and Micro-scale short carbon fibers concentration.(3)Multi-scale reinforcement material concentration. In the matrix experiment, the results indicate that the value of mechanical strength increases with the content of benzoxazine increased. From the results, the 20wt% benzoxazine/epoxy significantly improves the mechanical strength up to 21.37% improvement in tensile strength; 33.45% improvement in flexural strength; 13.86% improvement in flexural modulus; 38.03% improvement in resistance of water absorption. However, because of the property benzoxazine is more brittle than epoxy, the impact strength of benzoxazine/epoxy copolymer reduces about 55%. The research shows that addition of graphene in the optimum content of 20wt% benzoxazine/epoxy composite 14.18% improvement in tensile strength, 22.83% improvement in the resistance of water absorption by adding the 0.5wt% graphene; 2.46% improvement in flexural strength, and 8.05% improvement in flexural modulus by adding the 0.25wt% graphene. It is showed that adding 8wt% micro-scale short carbon fiber has the best enhancement to the mechanical properties: increasing 22.93% in flexural strength and 9.84% in the resistance of water absorption. Finally, the optimum content of GNPs-0.5wt%/SF-8wt%/ Benzoxazine/ Epoxy composites preform the best enhancement to the properties about 22.62% improvement in tensile strength, 12.2% improvement in flexural strength, and 39.07% improvement in impact strength, 3.2-3.8 times improvement in torsion fatigue life. Because of the reason of short carbon fiber will produce a lot of micro-cracks in the fiber-end, the stress concentration would influence the ductility and lead to cracks propagation. In the result, the flexural tests reveal about 33.84% downtrend in flexural modulus.