Relevant bibliographies by topics / Kompositmaterial / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Kompositmaterial.

Dissertations / Theses on the topic 'Kompositmaterial'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Kompositmaterial.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Bhattacharya, Proma, Miriam Jansson, and Sofia Wretstam. "Kompositmaterial med cellulosabaserad grafenoxid." Thesis, KTH, Skolan för kemivetenskap (CHE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208913.

Full text
Abstract:
Målet med projektet var att förbättra polypropens gasbarriär genom att addera olika nanofyllmedel, grafenoxid och kalciumkarbonat. I detta projekt undersöktes främst hur genomsläppligheten av syrgasmolekyler, syrgaspermeabiliteten, ändrades när man tillsätter fyllmedel till polypropen med hjälp av MOCON. Resultaten visade att genomsläppligheten av syrgas minskade något med grafenoxid men blev sämre med den mindre tillsatsen av  kalciumkarbonat. Tester som utfördes gjordes med TGA och DSC men permabilitetstestet framhävs som det mest centrala. Resultaten som erhölls vid permabilitetsundersöknin
APA, Harvard, Vancouver, ISO, and other styles
2

Lysell, Rasmus, and Emelie Rosenberg. "Beräkning av absorptionskoefficient för kompositmaterial." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254826.

Full text
Abstract:
I artikeln behandlas mätningar av absorptionskoefficienten, parametern som beskriver hur ljud absorberas, för ett nytt kompositmaterial framtaget för bland annat installation i Globen. De metoder som användes begränsades till mätning i efterklangsrum samt mätningar med en ljudintensitetsprob. Frågeställningen var vad för värde på absorptionskoefficienten de olika metoderna gav samt för- och nackdelar mellan metoderna. Båda metoderna gav en koefficient på alpha 0.8 för flertalet frekvensband. Trots likheter i resultat ansågs mätningen i efterklangsrummet som mer pålitligt i och med dess noggran
APA, Harvard, Vancouver, ISO, and other styles
3

Gren, Bernhäll Oscar, and Adam Nilsson. "Bestämning av mekaniskaegenskaper för ett bio-kompositmaterial." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-68998.

Full text
Abstract:
The purpose of the work is the determination of flexural properties for thebiocomposite Durapulp. The study includes laborative tests on Durapulp andreference materials, commonly used in the building sector. Stiffness and strength of Durapulp show that it has the potential as a replacement for conventional wood-based materials.
APA, Harvard, Vancouver, ISO, and other styles
4

Oldenbo, Magnus. "Mechanical behaviour of SMC composites and structures /." Luleå, 2002. http://epubl.luth.se/1402-1757/2002/06/index.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Borg, Rikard. "Simulation of delamination initiation and growth in fiber composite laminates /." Linköping : Division of Solid Mechanics, Dept. of Mechanical Engineering [Hållfasthetslära, Institutionen för konstruktions- och produktionsteknik], Univ, 2002. http://www.bibl.liu.se/liupubl/disp/disp2002/tek776s.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Veronica, Berggren, and Gunnarsson Malin. "En analys av vilka utmaningar som finns för kompositmaterial inom flygindustrin." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-35567.

Full text
Abstract:
Sammanfattning  Inom flygindustrin blir komposit allt vanligare, framförallt på primära strukturdelar. Syftet med arbetet har varit att få en bild av de problem och utmaningar som finns för kompositer inom flygindustrin idag. Denna rapport har ett underhållsperspektiv och en analys har gjorts för att ta reda på vilka utmaningar och problem som användandet av kompositer kan medföra. Även för- och nackdelar har undersökts samt en jämförelse mellan komposit och aluminium har genomförts. För att ta reda på vilka utmaningar och problem som kan kopplas till komposit har intervjuer
APA, Harvard, Vancouver, ISO, and other styles
7

Marklund, Erik. "Modeling the mechanical performance of natural fiber composites." Doctoral thesis, Luleå : Department of Applied Physics and Mechanical Engineering, Division of Polymer Engineering, Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1544/2007/73/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Engkvist, Gustav, and Sebastian Hansson. "FE-modellering av hjullast på sandwichpanel." Thesis, Högskolan i Halmstad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28867.

Full text
Abstract:
This bachelor thesis in mechanical engineering was performed during the spring2015 in collaboration with Composite Consulting Group in Laholm. TheComposites Consulting Group works mainly with design and details of differentcomposite projects, their main area is FE-calculations, 3D-modelling andmechanical tests with composite materials.The aim of this bachelor thesis was to simplify the calculation process of solidmechanics for sandwich panels by simulation with computer software. The goalwas to decrease the time for the design and calculation process of the constructionand the cost of the prac
APA, Harvard, Vancouver, ISO, and other styles
9

Grubbström, Göran. "Reactive extrusion of wood-thermoplastic composites /." Luleå : Luleå university of technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3112390.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Szpieg, Magdalena. "A novel composite material from recycled constituents /." Luleå : Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3350732.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Eliasson, Calle, Mikael Hanneberg, Fredrik Löfblom, Martin Mohlin, Nathalie Nowicki, and Emma Thilén. "Viktreducering av en batterilåda : - Undersökning om en batterilåda kan tillverkas i kompositmaterial." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194394.

Full text
Abstract:
Den nya synen kring utsläppen av växthusgaser har påverkat fordonsindustrin där nya lösningar måste sökas för att möta de nya strängare kraven samt förfrågan på mer miljövänliga fordon. Ett sätt har varit att ta fram de batteridrivna elbilarna som dessvärre har begränsningar i räckvidd. Batterianordningarna är i dagens läge till största delen tillverkade i metall, dessa har en stor viktminskningspotential som leder till en större räckvidd för bilen. För att uppnå detta mål har en undersökning genomförts kring möjligheten till en materialövergång från metall till kompositmaterial för en batteri
APA, Harvard, Vancouver, ISO, and other styles
12

Jernström, Jenny. "Kryckkäpp i avancerat kompositmaterial : Att med formgivning försöka överbygga social stigmatisering vid långtidsanvändning av kryckkäppar." Thesis, Linnéuniversitetet, Institutionen för design, DE, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-23318.

Full text
Abstract:
Ett examensarbete som undersöker relationen mellan social stigmatisering och hjälpmedelsformgivning, med en vision om att ta fram en funktionell kryckkäpp anpassad för lågtidsanvändning där formen och det visuella uttrycket inte uppfattas som ett handikapp. Genom analys av standardkryckan från Swereco, intervjuer med sjukgymnaster, hjälpmedelsansvariga och långtidsanvändare av kryckkäppar lades en grund för formgivningsarbetet. Designprocessen ITK (Identity Tool Kit) har utgjort diskussions- och intervjuunderlag och en nära kontakt med en extern mentor som uteslutande jobbar i avancerade kompo
APA, Harvard, Vancouver, ISO, and other styles
13

Megnis, Modris. "Inelastic analysis of fiber reinforced polymeric composites /." Luleå : Luleå tekniska univ, 2002. http://epubl.luth.se/1402-1544/2002/07.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Fernberg, Patrik. "Toughness of short fiber composites : an approach based on crack-bridging /." Luleå : Luleå tekniska univ, 2002. http://epubl.luth.se/1402-1544/2002/12/index.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Johansson, Martin, and Johan Sundqvist. "Utveckling och design av gripdon för komposithantering." Thesis, Linköpings universitet, Maskinkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131555.

Full text
Abstract:
Saab AB levererar lösningar, produkter och tjänster inom militärt försvar och civil säkerhet. Affärsområdet Aeronautics producerar förutom det militära stridsflygsystemet Gripen även komponenter till civila flygplan, dels sina egna men även andra flygplansproducenter som Airbus och Boeing. Projektets mål är att utveckla ett multifunktionellt robotgripdon för att undersöka automationsmöjligheter kring uppläggning av kolfiberskikt på ett plant underlag, en uppläggning som idag sker för hand. Processen som önskas automatiseras innefattar tillskärning av skikt, förflyttning från skärbord och place
APA, Harvard, Vancouver, ISO, and other styles
16

Löwe, Rakel. "Utvärdering av mekanisk provning av fiberförstärkt plast." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356470.

Full text
Abstract:
In this work four fiber-reinforced polymers and one polymer were tested with four different mechanical testing methods, namely; vickers harness test, scratch test, fatigue test and tensile stress. The testing methods were evaluated according to their applicability on the materials mentioned. The purpose of the work is to give the reader an insight of what mechanical properties of materials mean and what kinds of properties one can expect from fiber-reinforced polymers. The purpose is also to give the reader a good sense of what can be expected from the methods tested on fiber-reinforced polyme
APA, Harvard, Vancouver, ISO, and other styles
17

Eitzenberger, Johannes. "Mechanics of microdamage development and stiffness degradation in fiber composites." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/69/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Graciani, Enrique. "BEM analysis of the single fiber fragmentation test." Licentiate thesis, Luleå : Luleå University of Tchnology, 2007. http://epubl.ltu.se/1402-1757/2007/52/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Rolinska, Monika, and Baback Hosseini. "Embedding Carbon Fibers in a Steel Matrix Through Additive Manufacturing : A part of the World Class Material-project at Swerim AB." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254355.

Full text
Abstract:
In recent years, steel components manufactured through additive manufacturing have increased their popularity and commercial importance and carbon fiber reinforced polymers are widely used in today’s society. Yet there is no composite material combining the properties of steel and carbon fibers. This thesis work is a part of the World Class Material-project at Swerim AB where different methods for manufacturing a steel matrix carbon fiber composite are researched upon. Two methods for additive manufacturing: selective laser melting and electron beam melting were used to evaluate the possibilit
APA, Harvard, Vancouver, ISO, and other styles
20

Rozite, Liva. "Non-linear behavior of bio-based composite : characterization and modeling." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18691.

Full text
Abstract:
The development and application of bio-based composite materials have been frequently studied. Most of the work is done on quasi-static performance of these materials. However, these composites are highly non-linear therefore there is need for investigation of their viscelastic and viscoplastic behavior. This thesis is dealing with characterization and modeling of behavior of bio-based composite. The effect of temperature and relative humidity on mechanical behavior of natural fiber reinforced bio-based matrix composites subjected to tensile loading was investigated. Composites with different
APA, Harvard, Vancouver, ISO, and other styles
21

Zhuang, Linqi. "Fiber/matrix interface crack propagation in polymeric unidirectional composite." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17391.

Full text
Abstract:
Fiber/matrix interface cracking plays an important role in determining the final failure of unidirectional composites. In the present study, energy release rate (ERR) for fiber/matrix interface debond growth originated from fiber break in unidirectional composite is calculated using 5-cylinders axisymmetric and 3-D FEM models with hexagonal fiber arrangement. In the model the debonded fiber is central in the hexagonal unit which is surrounded by effective composite. The effect of neighboring fibers focusing on local fiber clustering on the ERR is analyzed by varying the distance between fibers
APA, Harvard, Vancouver, ISO, and other styles
22

Saseendran, Sibin. "Effect of Degree of Cure on Viscoelastic Behavior of Polymers." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16927.

Full text
Abstract:
Reinforced polymer composites consist of continuous fibers embedded in a polymer matrix. The matrix is usually a thermoplastic or thermosetting resin. When thermosetting matrices are cured during the manufacture of composite parts, residual stresses develop within the part during the manufacture due primarily the thermally and chemically induced volumetric strains imposed on them. This can lead to shape distortions and sometimes weakening of the structure itself.Curing is the manufacturing process in which the thermoset resin is transformed from a liquid to a solid material. The molecular mech
APA, Harvard, Vancouver, ISO, and other styles
23

Osberg, Jacob, and Vadim Konov. "Utveckling av extraherbar kärna : Koenigsegg." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-37098.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Al-Ramahi, Nawres. "Numerical stress analysis in hybrid adhesive joint with non-linear materials." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67293.

Full text
Abstract:
This thesis presents systematic numerical study of stresses in the adhesive of a single-lap joint subjected to various loading scenarios (mechanical and thermal loading). The main objective of this work is to improve understanding of the main material and geometrical parameters determining performance of adhesive joint for the future analysis of failure initiation and development in these structures. The first part of the thesis deals with development of a 3D model as well as 2D model, optimized with respect to the computational efficiency by use of novel displacement coupling conditions able
APA, Harvard, Vancouver, ISO, and other styles
25

Boillat, Pauline. "Energy efficient fibre composites recycling." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298422.

Full text
Abstract:
In this project, an investigation will be performed about how to improve thermal properties of recycled composite material. First, a literature study was performed about the potential techniques to improve the heating efficiency of the composites. Heating  techniques,  fibres  and  possible  fillers  were  investigated.    Secondely, an experimental method was set with the material available.   In the laboratory a precedent  work  was  performed  on  the  thermal  conductivity  of  polyamide  12 reinforced  with  glass  fibres.   The  conductivity  of  polyamide  12  reinforced with carbon fib
APA, Harvard, Vancouver, ISO, and other styles
26

Valilla, Jorge. "Thermal characterization and comparison of different advanced composites for tooling applications." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77049.

Full text
Abstract:
The aim of this study if to give a comparison between different kind of high composite laminates (thin ply and conventional thickness plates) for tooling applications. The study mainly deals with the thermal behaviour of these materials after certain amount of time of exposure, and how this can affect the mechanical properties. This approach was chosen since thermal properties are of the biggest challenges when creating reliable parts to make tools.The study also serves as a deeper insight into the thin-ply laminates, how they work and give further characterization, since these are still novel
APA, Harvard, Vancouver, ISO, and other styles
27

SUNIL, SOORAJ. "Numerical Tool to Simulate Forming of Lamera HybrixTM." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-47138.

Full text
Abstract:
Composite materials are playing an essential role in construction industries, automobile industries, and mechanical industries which have better physical properties than original materials. Hybrix material is a kind of Composite sandwich material which have better properties like lightweight, durable, eco-friendly than original material. In an attempt to prove the quality in finite element analysis Hybrix material, creating a numerical tool to simulate the metal forming conditions. Spring back effect and residual stress are also taken into account in the method.
APA, Harvard, Vancouver, ISO, and other styles
28

Lundmark, Peter. "Degradation of thermo-elastic properties in damaged composite laminates : a theoretical study." Licentiate thesis, Luleå tekniska universitet, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26014.

Full text
Abstract:
Fiber composites are today widely used in different load carrying structures. The main reason is their high stiffness and strength to weight ratio. Due to these specific properties they are frequently used in car, marine and space industry. The damage that develops in such composites is generally much more complex in comparison with other conventional structural materials such as steel and aluminium. In those materials, one particular flaw might lead to failure. In laminated composites, many different kinds of defects can be obtained without leading to ultimate failure. If the composite lamina
APA, Harvard, Vancouver, ISO, and other styles
29

Lingois, Philippe. "Residual stresses in dental composites." Licentiate thesis, Luleå tekniska universitet, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17853.

Full text
Abstract:
In several European countries, dental composites are replacing mercury-containing amalgams as the most common restorative materials. The problems with dental composites are they can induce pain for the patient, fracture of the tooth, gap between the tooth and the filling what will induce secondary caries. The main reason is residual stresses. The factors affecting residual stresses are known; it is Young's modulus, volume changes, relaxation, geometry, but their importance is unknown. A model approach has been chosen in order to determine what are the main factors. An experimental set-up, show
APA, Harvard, Vancouver, ISO, and other styles
30

Fernberg, Patrik. "Fiber bridging concepts applied to short fiber composites." Licentiate thesis, Luleå tekniska universitet, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18743.

Full text
Abstract:
Polymer composite materials are in wide-spread use in the transportation industry. In aerospace industry the use these materials are established while in automotive industry the interest is increasing. The attention of automotive industry is to a great deal focused on various kinds of molded composites such as glass mat reinforced thermoplastics (GMT) and sheet molding compound (SMC). Their interest is to a large extent driven by the possibility to manufacture components of complex geometry in a cost- efficient process with these materials. An increasing number of car and truck manufacturers a
APA, Harvard, Vancouver, ISO, and other styles
31

Lindhagen, Johan. "Notch sensitivity and failure of glass mat reinforced polypropylene." Licentiate thesis, Luleå tekniska universitet, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18077.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Sjögren, Anders. "Failure behaviour of polypropylene/glass bead composites." Licentiate thesis, Luleå tekniska universitet, 1995. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18681.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Olofsson, S. Kurt. "Filament winding of thermoset composites : process modelling and experimental verification." Licentiate thesis, Luleå tekniska universitet, 1995. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26050.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Zhuang, Linqi. "Effects of Non-uniform Fiber Distribution on Fiber/matrix Interface Crack Propagation in Polymeric Composites." Doctoral thesis, Luleå tekniska universitet, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62974.

Full text
Abstract:
Fiber/matrix interface cracking plays an important role in determining the final failureof unidirectional (UD) composites. When subjected to longitudinally tensile loading,fiber/matrix interface debonds originate from fiber breaks or initial defects propagatealong loading direction. Depending on the quality of fiber/matrix interface, debondscould keep growing longitudinally which leads to the degradation of compositestiffness or kink out of interface and connect with neighboring debonds or fiberbreaks that forms a so called critical fracture plane which leads to the final failure ofUD composit
APA, Harvard, Vancouver, ISO, and other styles
35

Loukil, Mohamed Sahbi. "Experimental and numerical studies of intralaminar cracking in high performance composites." Doctoral thesis, Luleå tekniska universitet, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26501.

Full text
Abstract:
The macroscopic failure of composite laminates subjected to tensile increasing load is preceded by initiation and evolution of several microdamage modes. The most common damage mode and the one examined in this thesis is intralaminar cracking in layers. Due to this kind of microdamage the laminate undergoes stiffness reduction when loaded in tension. For example, the elastic modulus in the loading direction and the corresponding Poisson’s ratio will decrease.The degradation of the elastic properties of these materials is caused by reduced stress in the damaged layer which is mainly due to two
APA, Harvard, Vancouver, ISO, and other styles
36

Pupure, Liva. "Non-linear model applied on composites exhibiting inelastic behavior: development and validation." Doctoral thesis, Luleå tekniska universitet, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26552.

Full text
Abstract:
The polymeric composite materials are in high demand by industries where light and strong materials are required. Although manmade fiber (e.g. glass, carbon, aramid fibers) are most often used to reinforce polymers, natural fibers due to their environmental friendliness and sustainability have been also considered. Natural fiber composites have shown to have great potential as a substitute for conventional glass fiber materials. However, bio-based composites exhibit highly non-linear behavior, besides they are very sensitive to elevated moisture and temperature. Therefore, careful design and o
APA, Harvard, Vancouver, ISO, and other styles
37

Jerpdal, Lars. "Processing of self-reinforced poly(ethylene terephthalate) composites for automotive applications." Doctoral thesis, KTH, Lättkonstruktioner, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219926.

Full text
Abstract:
The vehicles of the future must have less negative environmental impact during their use phase than the vehicles of today in order to avoid major climate change on earth. Consequently electric vehicles are currently under development with the purpose of reducing CO2 emissions when the vehicle is driven. There are also efforts put in to reducing the weight of vehicles in order to reduce the demand for energy to drive them. One important aspect of weight reduction is that new materials and technologies are developed. Plastic materials have low a density and can therefore be used to reduce the we
APA, Harvard, Vancouver, ISO, and other styles
38

Joffe, Roberts. "Matrix cracking and interfacial debonding in polymer composites." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26359.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Hajlane, Abdelghani. "Development of hierarchical cellulosic reinforcement for polymer composites." Licentiate thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17655.

Full text
Abstract:
Cellulose is an environmentally friendly material which is obtainable in vast quantities, since it is present in every plant. Cellulosic fibers are commercially found in two forms: natural (flax, hemp, cotton, sisal, wood, etc.) and regenerated cellulose fibers (RCF). The biodegradability, the morphological and mechanical properties make these fibers a good alternative to the synthetic reinforcement (e.g. glass fibers). However, as all other cellulosic fibers these materials also have similar drawbacks, such as sensitivity to moisture and poor adhesion with polymers. The first part of this wor
APA, Harvard, Vancouver, ISO, and other styles
40

Xu, Johanna. "Structural Lithium-ion battery: Multiphysics modeling of mechanical and electrochemical phenomena." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63048.

Full text
Abstract:
The quest for lighter materials and structures to reduce climate impacts in the automotive industry has paved the way for multifunctional solutions. Mass saving on a system level can be achieved by materials or structures having more than one primary function, thus reducing the number of components used. Structural batteries are composite materials that simultaneously carry mechanical loads while delivering electrical energy. While carbon fiber is a commonly used reinforcing material in high-performance composite materials, it also possesses excellent lithium intercalation properties. Therefor
APA, Harvard, Vancouver, ISO, and other styles
41

Sparnins, Edgars. "Mechanical properties of flax fibers and their composites." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16871.

Full text
Abstract:
Flax fibers, along with a number of other natural fibers, are being considered as an environmentally friendly alternative of synthetic fibers in fiber-reinforced polymer composites. A common feature of natural fibers is a much higher variability of mechanical properties. This necessitates study of the flax fiber strength distribution and efficient experimental methods for its determination. Elementary flax fibers of different gauge lengths are tested by single fiber tension in order to obtain the stress-strain response and strength and failure strain distributions. The applicability of single
APA, Harvard, Vancouver, ISO, and other styles
42

Nyström, Birgitha. "Natural fiber composites : optimization of microstructure and processing parameters." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17370.

Full text
Abstract:
Natural fiber composites, (NFC) are defined in this work as a group of materials where at least the fibers originates from renewable and CO2 neutral resources. NFC consists of a polymer matrix and a natural fiber. The fibers which originate from wood or plants can replace non-renewable fibers or fillers or simply replace part of the plastic. If plastics from renewable resources are used, NFC is a 100% renewable material. Even though there is very large variety of fibers, matrices and manufacturing techniques used to produce NFC, these materials are often separated as its own material class. Ho
APA, Harvard, Vancouver, ISO, and other styles
43

Hörberg, Erik. "An Experimental Investigation of Shape Distortions in Aerospace Composites." Licentiate thesis, KTH, Lättkonstruktioner, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-269076.

Full text
Abstract:
Composite materials are increasingly used in primary structure of modern commercial aircraft. Its excellent material characteristics enables reduction of structural weight compared to traditional metal solutions and thereby offers reduction of fuel consumption and carbon dioxide (CO2) emissions. In the aerospace industry, carbon fibre reinforced plastics or CFRP is the most commonly used composite material, where the reinforcement is held together by a thermoset resin, often epoxy, referred to as the matrix. When manufacturing aircraft composite parts, the curing temperature is usually in-betw
APA, Harvard, Vancouver, ISO, and other styles
44

Lund, Per, and Peter Jakobsson. "Detaljerad FE-modellering." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28682.

Full text
Abstract:
Detta examensarbete beskriver undersökningen av kärnmaterial i en sandwichpanel under belastning. Arbetet har utförts tillsammans med CCG i Laholm, Sverige. Kärnmaterialen lämpar sig vid design av sandwichpaneler på grund av sin låga vikt och sin förmåga att klara av högt tryck. Då materialet uppvisar ett ickelinjärt beteende skapar det problem vid design av sandwichpaneler och leder till att materialsammansättningarna tillverkas konservativa mot verkligheten. Projektet har gått ut på reducera designprocessen genom att bygga upp och simulera materialmodeller i programvaran ABAQUS för att kunna
APA, Harvard, Vancouver, ISO, and other styles
45

Sjödin, Julia. "Elektrolytflödesbatteri : Utveckling av en elektrolytflödesbatteriprototyp." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413431.

Full text
Abstract:
Syftet med arbetet är att designa ett elektrolytflödesbatteri som möter kraven att den perforerade laddningsuppsamlaren i batteriet ska ska ha en resistans väl under 3 ohm samt ha god kontakt med kompositelektroden gjord av ett aktivt elektrodmaterial belagt på kolfiltsubstrat utan att påverka elektrolytens flödesmöjligheter. Det finns också krav på att cellen ska vara tät, tåla en syrakoncentration på 3,3 M (H_2SO_4) samt att flödet skapat av en pump ska ske vinkelrätt mot kompositelektroden och laddningsuppsamlaren. Först skapades en design som inte gav utrymme till mer elektrolyt än vad som
APA, Harvard, Vancouver, ISO, and other styles
46

Albin, Lundgren, and Bengtsson Rudolf. "Fiberarmerad betong : En analys av fiberarmerat plattbärlag." Thesis, Högskolan i Halmstad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44883.

Full text
Abstract:
Fiber-reinforced concrete is a construction material that holds high promise in progressing theconstruction industry. The fibers impact on crackproperties as well as strength means there isa wide array of application areas. Still this material holds a very limited area of application asof today. One of the main reasons for this is the lack of examples and tests in new applicationareas. This work therefore aims to identify whether fiber-reinforced lattice girder elementscan compete with an element reinforced in the traditional way in any of the categories cost,work environment, strength or envi
APA, Harvard, Vancouver, ISO, and other styles
47

Corvo, Alguacil Marina. "Substitution of thermosets by thermoplastic resins in electrical insulation applications." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66557.

Full text
APA, Harvard, Vancouver, ISO, and other styles
48

Rusu, Viorel Marin. "Composite materials made of chitosan and nanosized apatite : preparation and physicochemical characterization." Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/231/.

Full text
Abstract:
Taking inspiration from nature, where composite materials made of a polymer matrix and inorganic fillers are often found, e.g. bone, shell of crustaceans, shell of eggs, etc., the feasibility on making composite materials containing chitosan and nanosized hydroxyapatite were investigated. A new preparation approach based on a co-precipitation method has been developed. In its earlier stage of formation, the composite occurs as hydrogel as suspended in aqueous alkaline solution. In order to get solid composites various drying procedures including freeze-drying technique, air-drying at room temp
APA, Harvard, Vancouver, ISO, and other styles
49

Somberg, Julian. "Mechanical and Thermal Characterisation of Novel UHMWPE Composites for Total Joint Arthroplasty." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74970.

Full text
Abstract:
Total joint arthroplasty surgeries are known to have a high success rate but the longevity of the implants still acts as a limiting factor. Ultrahigh molecular weight polyethylene is the material of choice for the implant bearing surfaces due to its excellent clinical and tribological performance. A common problem associated with the polymer is however the loosening of the implant from its surrounding bone tissue. This phenomenon is caused by a biological reaction to released wear particles. Reducing the release of wear particles will increase the lifespan of implants and can be accomplished b
APA, Harvard, Vancouver, ISO, and other styles
50

Borg, Erik. "New Impact test method for rock drill inserts." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355151.

Full text
Abstract:
This work has been performed at the Applied Materials ScienceDivision at The Ångström Laboratory in collaboration with SandvikMining AB. The project is part of the joint research programmeCoFree.In this work, the problem of finding an impact test method forcemented carbide rock drill inserts is considered. A suitable testmethod is required to benchmark alternative binder cemented carbidesagainst today’s cobalt based grades. The developed test method isbased on a Charpy pendulum arrangement and utilizes, as in rockdrilling, impact of cylindrical bars to achieve the high impact forcesufficient t
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography