Dissertations / Theses on the topic 'Adhesive performance'
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Su, Ning. "Durability and fatique performance of structural adhesives and adhesive joints." Thesis, University of Dundee, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240601.
Full textRazak, Zeenah. "The durability performance of automotive adhesive joints." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397238.
Full textNordqvist, Petra. "Exploring the Wood Adhesive Performance of Wheat Gluten." Doctoral thesis, KTH, Ytbehandlingsteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94883.
Full textQC 20120514
Mays, Geoffrey Charles. "Fatigue performance and durability of structural adhesive joints." Thesis, University of Dundee, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334180.
Full textRanade, Shantanu Rajendra. "Performance Evaluation and Durability Studies of Adhesive Bonds." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64990.
Full textPh. D.
Pye, Andrew John. "The structural performance of glass-adhesive T-beams." Thesis, University of Bath, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275417.
Full textKlug, Jeremy Hager. "High-performance adhesive systems for polymer composite bonding applications /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/9883.
Full textTrinh, Khanh. "Adhesive Performance of UV-cured Clearcoat on Galvanized Steel." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261149.
Full textI denna studie undersöktes möjligheten att applicera UV-härdande lacker på olika förbehandlade galvaniserade stålsorter för bandlackering. Detta för att förstå mer om vidhäftningen påverkas av, och på vilket sätt, kombinationen av respektive UV-lack med olika metallsubstrat. Två olika UV-formuleringar, akrylat and epoxy, applicerades på fem olika stålsubtrat och även screeningsstudie på UV-LED utfördes. Målet är att undersöka uthärdning av lackeringar, topologin och hydrofilicitet, material och mekaniska egenskaper hos färglacken och de lackade systemen, samt möjlighet att använda LED-lampa som UV-källan. Resultatet visar att akrylat ger en hydrofil yta medan epoxy är hydrofil men är mer hydrofob än akrylat. Akrylatet är inte kompatibelt med Standard Ti-pretreatment från PO substrat och uthärdning av epoxy inhiberas av förbehandlade primer på PP-prover. Uthärdning med UV-LED är möjligt och bör undersökas ytterligare. Det gick inte att jämföra mellan de två UV-formuleringarna, akrylat och epoxy, på grund av fel tjocklek hos akrylatfilmerna.
Jacobs, William P. V. "Performance of Pressure Sensitive Adhesive Tapes In Wood Light-Frame Shear Walls." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32795.
Full text Variables investigated within the main study were the following: the use of OSB versus plywood sheathing, the effect of priming and surface sanding on adhesion, and the comparison of connections involving mechanical fasteners with those that utilized only adhesive tape or a combination of the two. It was found that an application pressure of 207 kPa (30 psi) or greater was needed to form a sound bond between the acrylic foam adhesive tape and a wood substrate. Properly bonded OSB and plywood connections provided fairly ductile failure modes. Full-scale walls constructed with adhesive tape performed similarly to traditional wall configurations, while walls constructed with a combination of adhesive tape and mechanical fasteners provided significant gains in strength and toughness. The results of this study serve to provide a foundation for expanding the engineering uses of acrylic foam adhesive tape for structural applications.
Master of Science
Karhnak, Stephen J. "Predicting mechanical performance of adhesively bonded joints based on acousto-ultrasonic evaluation and geometric weighting." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-05022009-040452/.
Full textSchindler, Markus [Verfasser], Peter [Akademischer Betreuer] Müller-Buschbaum, and Friedrich [Akademischer Betreuer] Simmel. "Pressure sensitive adhesives - inner structure and adhesive performance / Markus Schindler. Gutachter: Peter Müller-Buschbaum ; Friedrich Simmel. Betreuer: Peter Müller-Buschbaum." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1064976573/34.
Full textPakdel, Amir Saeid. "The Effect of Cellulose Nanocrystal Surface Properties on Emulsion-Based Adhesive Performance." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42310.
Full textWang, Ying. "Adhesive performance of soy protein isolate enhanced by chemical modification and physical treatment /." Search for this dissertation online, 2006. http://www.lib.umi.com/cr/ksu/main.
Full textRatta, Varun. "Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/27771.
Full textPh. D.
Jackson, Mitchell L. "Investigation of Adhesive and Electrical Performance of Waterborne Epoxies for Interlayer Dielectric Material." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/40359.
Full textPh. D.
Flores, Joel D. "Chemical characterization and two-step cure kinetics of a high performance epoxy adhesive system." Thesis, Wichita State University, 2006. http://hdl.handle.net/10057/1609.
Full textThesis (M.S.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry.
"July 2006."
Flores, Joel D. Stevenson William T. K. "Chemical characterization and two-step cure kinetics of a high performance epoxy adhesive system." Diss., A link to full text of this thesis in SOAR, 2006. http://soar.wichita.edu/dspace/handle/10057/1609.
Full text"July 2006." Title from PDF title page (viewed on Nov. 4, 2007). Thesis adviser: William T. K. Stevenson. Includes bibliographic references (leaves 95-99).
MARCHIONE, FRANCESCO. "Application of adhesive joints on a tensegrity floor: verification of technology and mechanical performance." Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/294871.
Full textThe aim of the present work was to examine the applicability of adhesive bonding technology to innovative building components. The use of structural adhesives represents the constructive implementation of the principle of “technological simplification”, that is, the possibility of assembling industrially manufactured products with high performance and a limited number of components, reducing environmental emissions during their life phases. In particular, the technical-constructive feasibility of a steel and glass tensegrity floor was verified, developing the idea of Patent No. 00014426973 (inventor Prof. P. Munafò). The research activity developed with the testing of different types of adhesive joints with steel, aluminium, glass, and adherends both after curing in laboratory conditions and after artificial accelerated ageing. The adhesive joint between the steel substructure and the glass deck was then determined by design to allow the deck to structurally cooperate with the tensegrity substructure. The prototype of the floor was assembled, and the mechanical performance was verified by load tests. In parallel with the experiments, numerical analyses were performed on the structural element to verify the hypotheses adopted. The results obtained confirmed the assumption underlying the patent idea by validating the predictions of the numerical analysis. In fact, the load tests showed a significant increase in the stiffness of the floor thanks to the adhesive joint between the glass deck and the tensegrity substructure.
Mobilio, Nicola. "The use of lithium disilicate in fixed dental prosthesis: from the adhesive interface to clinical performance." Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1071540.
Full textAmathieu, Ludivine. "Assessment of a Light-Activated Adhesive for Hernia Mesh Repair." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292214.
Full textStark, Alyssa Yeager. "The Effect of Water on the Gecko Adhesive System." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1405334677.
Full textZhu, Li. "Studies of soy protein adhesive performance on the effects of ph, amino acid group, and temperature /." Search for this dissertation online, 2006. http://wwwlib.umi.com/cr/ksu/main.
Full textKhammassi, Sabrine. "Nanotechnology and bonded joints : an investigation of the mechanical performance of an adhesive doped with nanofillers." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0021.
Full textAdhesively bonded joint is a joining technique that is increasingly in a request today in many fields such as the automotive, aerospace, and naval. The adhesive selection is an important parameter to guarantee the reliability and durability of an adhesively bonded joint. It is well known that the wrong design of a bonded joint, the wrong choice of adhesive, or even a poorly executed surface treatment can have dramatic consequences. In terms of performance, the incorporation of carbon-based nanoparticles into the adhesive improves the performance of bonded joints. In this study, DGEBA adhesive doped by three kinds of nanofillers is established. Indeed, the adhesive has been doped with carbon nanotubes (CNT), graphene nanoplatelets (GNP), and carbon black (CB) with different mass fractions (1wt.%, 2wt.%, and 5wt.%). The overall objective is to study the influence of the type, mass fraction, and dimensions of the nanofillers on the mechanical behavior of the adhesive and the bonded joint. The results showed that each type of adhesive reinforced with nanofillers has a good potential in terms of mechanical behavior under static and dynamic loadings. However, the presence of a high mass fraction of nanoparticles tends to lead to degradation compared to the neat adhesive due to the transformation in microstructure morphology and physicochemical interactions. In addition, to quantify the damage resistance of the nanofiller-doped adhesive and demonstrate the adhesion compatibility with various kinds of substrates; DCB and ENF tests were performed on aluminum/aluminum and composite/composite bonded joints. Besides, numerical models taking into account the damage of the doped adhesive were developed and validated with the experimental results. This study demonstrates that the type, mass fraction, size, and shape of nanofillers play an important role in improving the performance of the adhesively bonded joints
Ramkumar, S. Manian. "Process analysis and performance characterization of a novel anisotropic conductive adhesive for lead-free surface mount electronics assembly." Diss., Online access via UMI:, 2008.
Find full textOthman, Daryan Jalal. "The influence of adhesive curing temperature upon the performance of FRP strengthened steel structures at ambient and elevated temperatures." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29646.
Full textAraújo, Cíntia Tereza Pimenta de 1968. "Use of fluorescence in the performance evaluation of adhesive systems = Uso da fluorescência na avaliação do comportamento de sistemas adesivos." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289658.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-21T22:09:59Z (GMT). No. of bitstreams: 1 Araujo_CintiaTerezaPimentade_D.pdf: 9367664 bytes, checksum: 6c7161dae0f158a143f829e530249b20 (MD5) Previous issue date: 2013
Resumo: A microscopia confocal de varredura a laser (MCVL) é um recurso de visualização microscópica que permite a análise de materiais ou estruturas com requisitos mínimos de preparação de amostras de modo não destrutivo. Assim, os objetivos deste estudo foram: avaliar a influência da incorporação do corante fluorescente Rodamina B (R) nas propriedades mecânicas resistência coesiva (RC), módulo de elasticidade (ME) e resistência à flexão (RF) de 2 sistemas adesivos, o autocondicionante Clearfil SE Bond e o convencional Scotchbond Multi-Purpose (estudo 1); validar o método modificado de microtração (?TBS), em que micro-amostras de secção transversal de 0,09 mm2 foram testadas e verificar a influência da R na resistência à união a dentina e integridade interfacial através de microscopia confocal (estudo 2). Para avaliar a influência do corante, 0,16 mg/ml de R foram incorporados aos adesivos constituindo assim dois grupos para cada adesivo: grupos dos adesivos corados e não corados totalizando 4 grupos experimentais. Para a análise da RC, E e RF, os corpos de prova foram confeccionados a partir de uma matriz de silicone por adição. Sobre a matriz, foram dispensados 10 ?L de adesivo variando de acordo com cada grupo de adesivos corados e não corados. RC (n= 10), E e RF (n= 5) foram avaliadas em máquina de ensaio universal a 0,5 mm/min, até a ruptura da amostra. Para visualização em microscopia confocal e análise da resistência à união os adesivos foram aplicados à superfície plana da dentina oclusal de 32 pré-molares humanos. Após a realização dos procedimentos adesivos, realizaram-se as restaurações (blocos de 16 mm2) com Charisma Opal (Kulzer - cor A3). Em seguida, para a realização do teste modificado de microtração, micro-amostras em forma de palito (secção transversal 0,09 mm2) foram confeccionadas. Previamente ao ensaio mecânico, foi realizada através de MVCL a análise micromorfológica das microamostras dos grupos de adesivos corados. Posteriormente a resistência à união foi mensurada através do ensaio modificado de microtração a velocidade de 0,5 mm/min em máquina de ensaio universal. Os dados de todos os testes avaliados foram submetidos à análise de variância dois fatores. Os resultados mostraram que o comportamento dos sistemas adesivos investigados não se modificou, independente da presença do corante, pois não foram observadas diferenças significativas nas propriedades mecânicas estudadas: resistência à união, resistência coesiva, resistência flexural, módulo de elasticidade, bem como a integridade interfacial. A preparação de micro-amostras não comprometeu os resultados do ensaio de resistência adesiva. De acordo com os resultados obtidos e análise dos parâmetros: coeficiente de variação, porcentagem de padrão de fratura e incidência de falhas prematuras, concluiu-se que o teste modificado de microtração foi considerado um método confiável para a avaliação da resistência à união de sistemas adesivos. A técnica de visualização microscópica confocal produziu informações detalhadas da interface adesiva e pode ser bem indicada para a avaliação da efetividade de união de sistemas adesivos. Desta forma, é possível associar ambas as metodologias obtendo-se uma avaliação mais realista e confiável dos materiais restauradores
Abstract: The confocal laser scanning microscopic (CLSM) is a tool of visualization that allows microscopic analysis of materials or structures labeled with fluorescent dyes with minimal requirements of specimen's preparation nondestructively. The aims of this study were: to evaluate the influence of incorporation of fluorescent dye Rhodamine B (R) in the properties mechanical: cohesive strength (CS), elastic modulus (E) and flexural strength (FS) of the selfetching Clearfil SE Bond and etch-and-rinse Scotchbond Multi-Purpose (Study 1); validating the modified microtensile method using micro-specimens cross section of 0.09 mm2 (?TBS) and evaluate the influence of R in bond strength in dentin and interfacial integrity by confocal microscopy (study 2). To evaluate the influence of the dye, 0.16 mg/ml of R were incorporated into adhesives thus forming two groups for each adhesive: groups of labeled adhesives and no-labeled totaling 4 experimental groups. For the analysis of CS, E and FS the specimens were made from a silicone matrix. About the matrix were 10 ?L dispensed adhesive varying according to each group of adhesives stained or not. CS (n = 10), E and FS (n = 5) were evaluated in a universal testing machine at 0.5 mm/min until failure of the specimen. For visualization in confocal microscopy and bond strength analysis (n = 8), the adhesives were applied to the occlusal dentine surface 32 of human premolars. After procedures adhesives, composite crowns approximately (16 mm2) were built up with Charisma Opal (Kulzer - color A3). Then for testing modified microtensile, micro-specimens beam-shaped were prepared. Prior to mechanical testing micromorphological analysis of micro-sticks of the groups of labeled adhesives was performed using CLSM. Subsequently bond strength was measured using the modified microtensile test in a universal testing machine speed of 0.5 mm/min. The results showed that the behavior of the adhesive systems investigated did not change regardless of the presence of the dye, as there were no significant differences in mechanical properties studied: bond strength, tensile strength, flexural strength, modulus of elasticity, as well as interfacial integrity. The preparation of micro-specimens did not affect the results of the bond strength test. According to the analysis results and parameters: coefficient of variation percentage of fracture pattern and incidence of early failures, it is concluded that the modified microtensile test was considered a reliable method for evaluating the bond strength of adhesive systems. The confocal microscopic visualization technique yielded detailed information of the adhesive interface and can be well suited for evaluating the effectiveness of adhesive systems. Thus, it is possible to associate both methods give a more realistic and reliable adhesive restoration on the presence of fluorescent dye
Doutorado
Dentística
Doutora em Clínica Odontológica
TERLIZZI, VANESSA. "Applications of innovative materials, GFRP and structural adhesives, for the curtain wall: technological and performance verification." Doctoral thesis, Università Politecnica delle Marche, 2018. http://hdl.handle.net/11566/252565.
Full textThe aim of this work is to demonstrate the applicability of innovative materials, such as Glass Fibre Reinforced Polymer (GFRP) industrialized components (profiles), structural adhesives, for the realization of curtain walls with high mechanical and thermal performances and low environmental impact. This objective with the “Technological Simplification” principle is verified. This latter is the guiding principle to the base of the search and experimental tests carried out by the research group. The teamwork coordinator and patent inventor is Prof P.Munafò, with him I developed a “System for the realization of building façade” (n. 102015000087569). The “Technological Simplification” principle allows the building components realization with high performance and easy to assemble, by using a limited number of pieces. All this involves lower energy consumption in the production, assembly, maintenance and disposal phases. For this reason, the construction element can be considered environmentally sustainable. In this thesis, the feasibility of the constructive system for the realization of building façade, through the experimental tests and component life cycle analysis, is verified. The components and materials properties both in laboratory conditions and after different types of ageing conditions (durability) are tested. The interaction between building components and environment, from the production to ultimate disposal (LCA - Life Cycle Assessment) are analysed. The methods used were mostly of the experimental type. The material mechanical properties both in environmental conditions and in different types of ageing conditions were analysed, such as continuous condensation (ISO 6270-2) and UV irradiation (ASTM D904–99). Additional test with combined artificial ageing (climatic chamber and exposure to UV radiation - Tcc+Tuv – and the other way around - Tuv+Tcc) were tested. The numerical and analytical studies were carried out, with the objective to check and validate the results obtained through experimental tests. The main outcome was the validation of the patents basic ideas, which is a key point in the industrialization process of the construction elements (Structural Member). The aim of this work is to demonstrate the feasibility of the use of pultruded Glass Fiber Reinforced Polymers (GFRP) profiles, adhesively joined with other materials (i.e. steel), in the construction sector. The objective is both to reduce the GFRP profiles deformation under loading conditions, and to avoid the brittle fractures that could occur in bolted joints. In the building engineering field, in fact, these issues (deformations and brittle fractures) prevent the use of pultruded materials. In the research activity, the possibility to adhesively join a steel laminate on the pultruded profile mullion for curtain walls was verified. The containment of the deformations and the prevention of brittle fractures in the bolted joint were checked, in order to verify the pultruded curtain wall feasibility, both constructively and for its structural and energy performances. Experimental results, in fact, demonstrated that the use of GFRP profiles, bonded with structural adhesives and combined with steel, is successful on curtain walls, even when they are exposed to adverse environmental conditions. The feasibility of the curtain wall implementation with high performance is verified.
Bailey, Teri. "Material Bodies." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555451326557221.
Full textPeden, Robert Alexander. "A study of the characteristics and parameters affecting the performance of road surfacing materials with particular reference to the adhesive aspects of road surface binding dressers." Thesis, University of Ulster, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243625.
Full textMajumdar, Prasun Kanti. "Strength and Life Prediction of FRP Composite Bridge Deck." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27285.
Full textPh. D.
Polo, Luz. "Caractérisation et optimisation de la performance des cartouches d'ancrage AMBEX sous chargement soutenu." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/10138.
Full textAbstract : Adhesive anchoring systems are used in many civil engineering applications, including rehabilitation and repair of infrastructure such as bridge decks, roadways, tunnels, dams, walls, columns, and in some geological explorations and mining. An adhesive anchoring system consists of three components: the anchor: a reinforcing bar or a threaded rod; the adhesive material: polymeric, cementitious or hybrid; and a substrate of concrete or masonry. The loads applied on the anchor rods are transmitted by a chemical adhesion to the substrate (reactions) and mechanical interlock between the components mentioned. The design pattern of uniform adhesion establishes that the structural performance of an adhesive anchoring system is determined by the bond strength (τ) developed across the contact surface, between the components within the anchor hole. This project, in partnership with AMBEX, investigates and assesses the performance of an anchoring system, with an adhesive of cementitious material, related to the creep behaviour. To achieve this, steel rebars were anchored in a conventional concrete substrate. Two adhesives were evaluated: AAC and ARC cartridges. Geometrical and installation parameters were taken into account, to ensure bond failure during pullout tests. Two service conditions were studied: room temperature (21ºC) and high temperature (43ºC). Static tensile tests and creep tests were performed. The results are presented in graphs “load-displacement-time”, in order to make predictions of future behavior. The project shows the advantages of adhesive anchors made of cementitious material, as a feeble creep rate at sustained load, and also some limitations, as the variability of tension test results for anchors tested with AAC cartridge.
Jain, Dharamdeep. "Humidity Driven Performance of Biological Adhesives." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510053266807976.
Full textDentzer, Laetitia. "Compréhension du suivi de polymérisation d’un système réactif phénolique fortement dilué en présence d’une phase latex pour l'élaboration d’un adhésif sans formaldéhyde." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI043.
Full textA new phenolic-type reactive system more environment friendly, namely phenol-, resorcinol- or formaldehyde-free, was characterized during this Ph.D. This system consists in the copolymerization of Phloroglucinol and Terephthalaldehyde (TPA) in highly diluted water solution conditions. First, a literature study allowed a selection of relevant experimental technics in order to follow the advancement of these complex systems in solution. The combination of chromatographic and spectroscopic analyses is required to characterize the soluble part of the Phloroglucinol-TPA based system. A mechanism of reaction to synthesize linear oligomers was proposed for short reaction times. The increase of the non-soluble part during the reaction in the analyses made after a solubilization step leaded to the conclusion of another type of mechanism where the oligomers are involved. A monitoring method to follow the state of the system by rheological measurement was also developed for the production process. Secondly, this system was used in the preparation of an adhesive based on Phloroglucinol, TPA and Latex. This adhesive was studied in a liquid state during it ‘maturation’ and in a solid state after curing resulting in films from several model systems. The stability of the system during maturation was checked even if condensation reactions of the Phloroglucinol-TPA still took place. After curing, a two-phase morphology of the films was observed which was found to be specific to the nature of the latex phase. It was concluded that the new Phloroglucinol-TPA system has a similar behavior to the one of Resorcinol-Formaldehyde in terms of mechanism and use in presence of latex. It showed the capability to replace the initial system in the preparation of a new adhesive more environment friendly
Li, Yi. "High performance electrically conductive adhesives (ecas) for leadfree interconnects." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26518.
Full textJethwa, Jagdish K. "The fatigue performance of adhesively-bonded metal joints." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/7526.
Full textThompson, Jonathan Ian. "The mechanical performance of adhesively bonded hydroxyapatite coatings." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245395.
Full textOsiyemi, Stephen Olusegun. "The fatigue performance of adhesively bonded fibre-composite joints." Thesis, Imperial College London, 1992. http://hdl.handle.net/10044/1/7971.
Full textBrett, Michael Alexander de Oliveira. "Prediction of the performance of adhesively-bonded composite joints." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9545.
Full textNeedham, Amanda Jane. "The effect of extensible substrates on the performance of pressure sensitive adhesives." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252207.
Full textYu, Tingmin. "The tractive performance of a friction-based prototype track." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-10192006-105926.
Full textIncludes bibliographical references. Includes bibliographical references. Available on the Internet via the World Wide Web.
Dastjerdi, Zahra. "Cellulose Nanocrystals: Renewable Property Modifiers for Pressure Sensitive Adhesives." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36649.
Full textTaylor, Ambrose Cornelis. "The impact and durability performance of adhesively-bonded metal joints." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8407.
Full textFeng, Chih-Wei. "Prediction of long-term creep behavior of epoxy adhesives for structural applications." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/2560.
Full textLi, Ningbo. "Isolation, characterization and adhesion performance of sorghum, canola and camelina proteins." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/18403.
Full textDepartment of Biological and Agricultural Engineering
Donghai Wang
Sorghum distillers dried grains with solubles (DDGS), canola and camelina meals are the main co-products resulting from grain-based ethanol or oil production. The main objective of this research was to study physicochemical properties of proteins isolated from DDGS, canola and camelina meals and their adhesion performance. Acetic acid-extracted sorghum protein (PI) from DDGS had superior adhesion performance in terms of dry, wet and soak adhesion strength compared to acetic acid-extracted sorghum protein (PF) from sorghum flour and aqueous ethanol-extracted sorghum protein (PII) from DDGS. PI had a significantly higher wet strength (3.15 MPa) than PII (2.17 MPa), PF (2.59 MPa), and soy protein without modification (1.63 MPa). The high content of hydrophobic amino acids in PI (57%) was likely the key factor responsible for high water resistance. Canola protein was extracted from canola meal and modified with different concentrations of NaHSO3 (0 to 15 g/L) during protein isolation. Unmodified canola protein showed the highest wet shear strength of 3.97 MPa cured at 190 °C. Adhesion strength of canola protein fractions extracted at pH 5.5 and pH 3.5 (3.9-4.1 MPa) was higher than the fraction extracted at pH 7.0. NaHSO3 slightly weakened adhesion performance of canola protein; however, it improved handling and flow-ability due to breaking of disulfide bonds in proteins. Albumin, globulin, and glutelins were isolated from camelina meal. Adhesion performance of globulin fraction behaved better than glutelin fraction. The greatest wet shear strength of globulin was 3.3 MPa at curing a temperature of 190 °C. Glutelin had a more protein aggregation compared with globulin, as indicated by higher crystallinity and thermal stability, and dense protein aggregate. This compact structure of glutelins may partially contribute to lower adhesion strength as compared to globulin.
Ghazali, Emna, and Emna Ghazali. "Mechanical performance of adhesively bonded repairs in honeycomb composite sandwich structures." Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/37713.
Full textEn service, les pièces aéronautiques en matériaux composites et structures sandwiches subissent des dommages qui nécessitent des réparations. Les réparations par patch interne en biseau, en escalier ou par combinaison des deux offrent une excellente restauration de la résistance mécanique pour ces structures composites. Cependant, l’environnement de réparation peut se révéler être un défi de taille quant à leur mise en œuvre, au choix des paramètres géométriques (angle de biseau, nombre de plis extra), à leur comportement mécanique sous différents chargements ainsi qu’à leur processus d’endommagement. Cette thèse présente une étude expérimentale et numérique (éléments finis) du comportement mécanique de réparations par patch interne effectuées sur des structures avec des peaux en composites à renforts tissés fabriquées hors autoclave et âme en Nomex en nid d’abeille. Afin de déterminer l’effet de différents paramètres géométriques sur la résistance de la réparation et de comprendre son comportement mécaniqueet son processus d’endommagement, une série de tests de caractérisation sous différents chargements (traction, compression, flexion) a été effectuée sur des structures sandwiches faite avec deux matériaux composites tissés pour la peau : soit du composite tissé taffetas (PW) ou satin de 8 (8HS) Des simulations numériques ont été effectuées afin de prédire le comportement mécanique de la réparation. Cette étude numérique a été effectuée en plusieurs étapes. Un premier modèle 2D qui suppose que la colle ait un comportement linéaire élastique a été développé et permet d’étudier la distribution des contraintes dans le joint de colle pour différentes configurations de réparation rectangulaire. Ensuite, le modèle 2D est modifié pour tenir compte du comportement élastoplastique de la colle et ceci permet de prédire le comportement mécanique d’une réparation rectangulaire jusqu’à la rupture. Par la suite, un modèle 3D est développé pour prédire le comportement de réparations circulaires sous des chargements de compression. Ce modèle tient compte de l’endommagement progressif des peaux en composite. Les résultats de ces simulations numériques sont comparés par la suite aux mesures expérimentales. Les modèles par éléments finis, avec une loi de comportement élastoplastique pour le joint de colle, permettent une estimation adéquate de la résistance ainsi que de l’endommagement des structures sandwiches réparées. Une étude paramétrique a eu lieu afin d’étudier l’effet de différents paramètres géométriques sur la résistance de la réparation. La mise en œuvre et la détermination de la performance mécanique des réparations par patch interne des structures sandwiches est une tâche complexe avec de multiples paramètres de matériaux et de procédés. D’une manière générale, cette thèse contribue à une meilleure compréhension du comportement mécanique des structures sandwiches réparées et de leur processus d’endommagement. Les modèles par éléments finis développés dans ces travaux ont été validés expérimentalement et des simulations paramétriques ont contribué à une meilleure compréhension de l’influence des différents paramètres géométriques sur la résistance de la réparation par patch interne.
In service, aeronautical components made of composite materials and sandwich structures are subject to type of damages that require repairs. Adhesively bonded repairs (scarf-scarf, step-step or scarf-step) offer an excellent mechanical strength recovery for these composite structures. However, the repair environment can be a significant challenge in terms of the choice of geometrical parameters (scarf angle, addition of an overply), damage process parameters and mechanical behavior under different loads.This thesis presents both experimental and numerical investigations of the mechanical behavior of internal patch repairs carried-out on Nomex honeycomb composite sandwich structures. The skins use an out-of-autoclave woven fabric made of carbon-epoxy composite materials. In order to determine the effect of different geometric parameters on the resistance of the internal patch repair and to better understand its mechanical behavior and damage processes, a series of mechanical tests under different loads (tensile, compression, bending) is conducted on the repaired sandwich panels made with either plain weave or 8 harness satin textile composites. Numerical simulations were carried out, in several stages, in order to determine the mechanical behavior of the repair. First, a 2D model that assumes a linear elastic behavior of the adhesive film was developed. This simple model allows to study the distribution of the stresses in the adhesive joint for different configurations of rectangular patch repair. Then, the 2D model is modified in order to account for the elastoplastic behavior of the adhesive film. The latter allows to predict the mechanical behavior of a rectangular internal patch repair until rupture. Subsequently, a 3D model is developed to predict the mechanical behavior of circular internal patch repairs under compressive loadings. This model takes into account the progressive damage and failure of the woven fabric skins. The results of these numerical simulations are validated by comparing them to experimental measurements. The finite element models that account for the elastoplastic behavior law for the adhesive joint allow predictions of the strength as well as the damage morphology of the repaired sandwich structures. A parametric study has also been conducted in order to determine the influence of the geometrical design parameters in the repair strength. Processing and assessment of the mechanical performance of internal patch repairs on sandwich structures is a complex task with multiple material and process parameters. In general, this thesis contributes to a better understanding of the mechanical behavior of adhesively bonded repaired sandwich structures and their damage process. The finite element models developed in this work and validated experimentally have contributed through parametric numerical simulations to an economical better understanding of the influence of different geometric parameters on the strength and failure of internal patch repaired sandwich panels.
In service, aeronautical components made of composite materials and sandwich structures are subject to type of damages that require repairs. Adhesively bonded repairs (scarf-scarf, step-step or scarf-step) offer an excellent mechanical strength recovery for these composite structures. However, the repair environment can be a significant challenge in terms of the choice of geometrical parameters (scarf angle, addition of an overply), damage process parameters and mechanical behavior under different loads.This thesis presents both experimental and numerical investigations of the mechanical behavior of internal patch repairs carried-out on Nomex honeycomb composite sandwich structures. The skins use an out-of-autoclave woven fabric made of carbon-epoxy composite materials. In order to determine the effect of different geometric parameters on the resistance of the internal patch repair and to better understand its mechanical behavior and damage processes, a series of mechanical tests under different loads (tensile, compression, bending) is conducted on the repaired sandwich panels made with either plain weave or 8 harness satin textile composites. Numerical simulations were carried out, in several stages, in order to determine the mechanical behavior of the repair. First, a 2D model that assumes a linear elastic behavior of the adhesive film was developed. This simple model allows to study the distribution of the stresses in the adhesive joint for different configurations of rectangular patch repair. Then, the 2D model is modified in order to account for the elastoplastic behavior of the adhesive film. The latter allows to predict the mechanical behavior of a rectangular internal patch repair until rupture. Subsequently, a 3D model is developed to predict the mechanical behavior of circular internal patch repairs under compressive loadings. This model takes into account the progressive damage and failure of the woven fabric skins. The results of these numerical simulations are validated by comparing them to experimental measurements. The finite element models that account for the elastoplastic behavior law for the adhesive joint allow predictions of the strength as well as the damage morphology of the repaired sandwich structures. A parametric study has also been conducted in order to determine the influence of the geometrical design parameters in the repair strength. Processing and assessment of the mechanical performance of internal patch repairs on sandwich structures is a complex task with multiple material and process parameters. In general, this thesis contributes to a better understanding of the mechanical behavior of adhesively bonded repaired sandwich structures and their damage process. The finite element models developed in this work and validated experimentally have contributed through parametric numerical simulations to an economical better understanding of the influence of different geometric parameters on the strength and failure of internal patch repaired sandwich panels.
Wong, King Jye. "Moisture absorption characteristics and effects on mechanical behaviour of carbon/epoxy composite : application to bonded patch repairs of composite structures." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00949293.
Full textLin, Yung-Sen. "Enhanced adhesion performance of primer to thermoplastic olefins by low temperature cascade arc discharge plasmas /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823318.
Full textRamirez, Edward A. "Gecko Digital Hyperextension: Kinematics, Surface Roughness and Locomotor Performance." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333986580.
Full textLee, Yong-Joon. "Structure-property behavior of novel high performance thermoplastic and thermoset structural adhesives and composite matrix resins." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162715/.
Full textPomes-Hadda, Mickael. "Caractérisations et performances des assemblages collés époxyde-amine/aluminium." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0067/document.
Full textCharacterization and evaluation of physical, chemical, physico-chemical and mechanical properties are an important point in the comprehension of the behavior of bonded polymer/substrate assemblies. Dielectric spectroscopy is an effective method of characterization to study molecular dynamics, and also allow in situ monitoring of bonded joints. Mathematical modeling of experimental results by the method of interval analysis overcomes many shortcomings of commonly used software (experimental error taken into account, accept or reject a model ...). It has been shown that in the presence of a metal substrate, a competition was held between the polymerization reaction and the reactions between the monomers and metal substrates, leading to an interphase (i.e. non-zero thickness of interface) having properties different than these of the bulk. These properties influence the adhesion between the epoxy-amine polymer and the aluminum substrate. Adhesion will be characterized by a standardized test and related to the properties of the interphase by various techniques. The aging of DGEBA-anime/aluminum system have been done during this study. During the aging, destructive and non-destructive tests were carried out in order to have a follow-up on the properties of interfaces and interphases of these bonded joints. The results were correlated in order to be able to use an in situ non-destructive testing to prevent the rupture at the interphase/interface between the adhesive and the substrate