Letteratura scientifica selezionata sul tema "Adhesives"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Adhesives".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Articoli di riviste sul tema "Adhesives"
1
Binhasan, Mashael, Khaled M. Al-Habeeb, Abdullah S. Almuqbil, Tarik A. Alhaidary, Yasser F. Alfawaz, Imran Farooq, Fahim Vohra e Tariq Abduljabbar. "Assessment of the Physical Properties of an Experimental Adhesive Dentin Bonding Agent with Carbon Nanoparticles". Crystals 12, n. 10 (12 ottobre 2022): 1441. http://dx.doi.org/10.3390/cryst12101441.
Testo completoAbstract (sommario):
The present study was aimed at reinforcing the control adhesive (CA) with two concentrations (2.5% & 5%) of carbon nanoparticles (CNPs) and evaluating the impact of these additions on the adhesive’s properties. Scanning electron microscopy (SEM) and energy dispersive X-Ray (EDX) spectroscopy were utilized to examine the morphological characteristics and elemental mapping of the filler CNPs. To investigate the adhesive’s properties, rheological assessment, shear bond strength (SBS) testing, analysis of the adhesive–dentin interface, degree of conversion (DC) analysis, and failure mode investigations were carried out. The SEM micrographs of CNPs verified roughly hexagonal-shaped cylindrical particles. The EDX plotting established the presence of carbon (C), oxygen (O), and zirconia (Zr). Upon rheological assessment, a gradual reduction in the viscosity was observed for all the adhesives at higher angular frequencies. The SBS testing revealed the highest values for 2.5% CNP adhesive group (25.15 ± 3.08 MPa) followed by 5% CNP adhesive group (24.25 ± 3.05 MPa). Adhesive type interfacial failures were most commonly found in this study. The 5% CNP containing adhesive revealed thicker resin tags and a uniform hybrid layer without any gaps (compared with 2.5% CNP adhesive and CA). The reinforcement of the CA with 2.5% and 5% CNPs augmented the adhesive’s bond strength. Nevertheless, a diminished viscosity (at higher angular frequencies) and reduced DC were observed for the two CNP reinforced adhesives. CNP reinforced dentin adhesives are effective in enhancing the adhesive bond integrity of resin to dentin.
2
Tsujimoto, Akimasa, Nicholas G. Fischer, Wayne W. Barkmeier e Mark A. Latta. "Bond Durability of Two-Step HEMA-Free Universal Adhesive". Journal of Functional Biomaterials 13, n. 3 (29 agosto 2022): 134. http://dx.doi.org/10.3390/jfb13030134.
Testo completoAbstract (sommario):
The purpose of this study is to compare bond durability, in terms of fatigue bond strength, of a two-step HEMA-free universal adhesive and representative adhesives in each systematic category. The adhesives used in this study were OptiBond FL, Prime&Bond NT, Clearfil SE Bond 2, G2-Bond Universal, and Scotchbond Universal Plus Adhesive. Fatigue bond strength testing and scanning electron microscopy analysis of adhesively bonded enamel and dentin interfaces were performed. For the adhesives in etch-and-rinse mode, the enamel fatigue bond strength of the G2-Bond Universal adhesive was significantly higher than those of other adhesives, and the dentin fatigue bond strength of Prime&Bond NT was significantly lower than the others. For adhesives in self-etch mode, the enamel fatigue bond strengths of Clearfil SE Bond 2 and G2-Bond Universal were significantly higher than that of the Scotchbond Universal Plus Adhesive, and the dentin fatigue bond strength of G2-Bond Universal was significantly higher than Clearfil SE Bond 2 and the Scotchbond Universal Plus Adhesive. The two-step HEMA-free universal adhesive showed higher enamel and higher or equal dentin fatigue bond strength than other selected representative adhesive systems in etch-and-rinse mode and higher or equal enamel and higher dentin fatigue bond strength than adhesive systems in self-etch mode.
3
Yoon, S. H., B. J. Kim, K. H. Lee e D. G. Lee. "The Effect of Quartz Nano-Particles on the Damage Monitoring of Adhesive Joint at Cryogenic Temperature". Advanced Materials Research 93-94 (gennaio 2010): 562–65. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.562.
Testo completoAbstract (sommario):
Recently, a piezoelectric method using piezoelectric characteristics of epoxy adhesives has been successfully developed for the adhesive joints, which can monitor continuously the damage of adhesively bonded structures without producing any defect induced by inserting a sensor. However, due to low piezoelectric properties of epoxy adhesives, the detection of micro crack was impossible. At the cryogenic temperature, the detection of micro crack is important to estimate the fatigue life because the polymeric adhesives become very brittle. Therefore, in this work, the epoxy adhesive was modified by quartz nano-particles which have much higher piezoelectric properties than the epoxy adhesives. To investigate the effects of quartz nano-particles, the static and dynamic tests of the tubular adhesive joints were performed to compare the joint strength and sensitivity of damage monitoring performance. From the experiment result, it was found that the quartz nano-particles not only improved the joint strength but also increased the sensitivity of damage monitoring performance at cryogenic temperature.
4
Zhang, Jun, e Hong Jia. "Performance of Cohesive Zone Models for Brittle and Ductile Adhesives". Advanced Materials Research 941-944 (giugno 2014): 2089–92. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2089.
Testo completoAbstract (sommario):
Damage modeling approach is increasingly used to simulate fracture and debonding processes in adhesively bonded joint. In order to understand the relation between the delamination behavior of different types of adhesives and the type of cohesive zone models (CZMs), the pure tension and pure shear experiments were conducted used two distinct adhesives, an epoxy-based adhesive in a brittle manner and VHBTM tape adhesive in a ductile manner. The traction-separation relations of the two adhesives were extracted from the tension and shear experimental results. Three types of cohesive zone models (CZMs) are adopted, including the exponential, bilinear, and trapezoidal models. VUMAT subroutine of CZMs as the adhesive layer is used to simulate the specimen tension and shear debonding procedures. The results demonstrate that (i) the bilinear CZM more suitably describes the brittle adhesive and the exponential CZM suitably describes the ductile adhesive to simulate the tension and shear failure. (ii) cohesive strength and work of separation are the significant affections on the simulation results. and (iii) the shape of CZM is a significant affections on the simulation the pure tension and shear debonding procedure.
5
Kongkon, Paweena, Wiwat Pichayakorn e Sasiwimol Sanohkan. "Novel Deproteinized Natural Rubber Latex Adhesive Used in Extraoral Maxillofacial Prostheses". Sains Malaysiana 50, n. 11 (30 novembre 2021): 3383–94. http://dx.doi.org/10.17576/jsm-2021-5011-22.
Testo completoAbstract (sommario):
This study aimed to develop an adhesive for silicone maxillofacial prostheses and compared the properties with the Daro adhesive hydrobond (Factor II, Inc, Lakeside, AZ, USA). Two adhesives were developed from non-vulcanized natural rubber-based adhesives (Adhesive A) and deproteinized natural rubber latex (DNRL) products (Adhesive B) and stored at 4 °C. The Control group was the commercial Daro adhesive hydrobond (Factor II, Inc, Lakeside, AZ, USA). The physical properties (appearance, viscosity, spreadability, color, and pH) of the adhesives were measured and every week for 12 weeks after storing at 4 °C. The adhesives were characterized under scanning electron microscopy. Mechanical testing done were peel bond strength and biocompatibility testing was done using MTT assay. Physical, surface, and mechanical properties were compared with the commercial adhesive. Data analysis was done using SPSS version 24. Both adhesives were physically and chemically stable at temperature 4 °C and had suitable peel bond strength adhesives as the commercial adhesive. Hence, the adhesives can be used to adhere to the maxillofacial silicone prostheses.
6
Geiss, Paul Ludwig, e Melanie Schumann. "Polymer Interphases in Adhesively Bonded Joints – Origin, Properties and Methods for Characterization". Materials Science Forum 941 (dicembre 2018): 2249–54. http://dx.doi.org/10.4028/www.scientific.net/msf.941.2249.
Testo completoAbstract (sommario):
Chemically curing adhesives are formulations requiring reactions to convert from liquid to solid. Once cured, these adhesives carry the potential to create strong load bearing joints, resisting even severe detrimental service conditions. In adhesively bonded joints with chemically curing adhesives the term "interphase" relates to the adhesive volume adjacent to the surface of the adherent (interface), which generally will exhibit properties different from those of the adhesive bulk polymer. The properties of these interphases play an important role concerning the performance and durability of structural adhesive joints. Therefore localized strain analysis in the cross-section of shear-loaded adhesive joints was performed by combining a high-precision mechanical testing device with digital microscopy and by developing a method for preparing, marking, and digitally tracking the local deformations in micro shear specimen. Non-uniform shear profiles developing in the cross-section of the adhesive joints after exceeding the yield point serve as a sensitive indication for mechanical surface-affected interphase properties and it could be observed, that deranged crosslinking promotes strain softening of the polymer in the interphase. Infrared analysis of the cross-sectional interphase region in adhesively bonded joints was performed with a Bruker Tensor II Fourier Transform Infrared (FTIR) spectrometer equipped with a Hyperion 3000 microscope with a 20x ATR germanium crystal objective and a MCT-Focal-Plane-Array-Detector (FPA), allowing to conduct high resolution chemical imaging and localized chemical analysis.
7
Gültekin, Kürşat, e Mustafa Enes Yazici. "Mechanical properties of aluminum bonded joints reinforced with functionalized boron nitride and boron carbide nanoparticles". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 236, n. 1 (10 novembre 2021): 37–49. http://dx.doi.org/10.1177/14644207211056020.
Testo completoAbstract (sommario):
In the presented study, the effect of hexagonal boron nitride and hexagonal boron carbide nanoparticles on the strength of adhesively bonded joints was investigated experimentally. Hexagonal boron nitride nanoparticles were functionalized using 3-(aminopropyl) triethoxysilane to improve adhesion and increase the interaction between epoxy and nanoparticles. Similarly, h-B4C nanoparticles were functionalized by using 3-(glycidyloxypropyl) trimethoxysilane. New structural nano adhesives were produced by reinforcing the functionalized nanoparticles into epoxy at different proportions (0.5 wt.%, 1.0 wt.%, 2 wt.%, 3.0 wt.%, 4.0 wt.%, and 5.0 wt.%). Two different epoxies with different viscosity values (MGS-LR285 and Araldite 2011) were used as adhesives, and aluminum alloy (AA2024-T3) was chosen as an adherend. Tensile test was carried out to determine the failure load of the adhesive joints, and the fracture surface morphology was examined after the test Additionally, Scanning electron microscopy and energy dispersion X-ray spectroscopy (SEM-EDS) analysis was performed to observe the distribution of boron nanoparticles in the adhesives. The experimental results showed that the reinforcement of hexagonal boron nitride and boron carbide nanoparticles to the adhesives increased the joint strength substantially depending on the reinforcement ratio and viscosity of the adhesives. The maximum increase in failure loads was achieved by adding 1 wt.% functionalized boron nitride to high viscosity Araldite 2011 adhesive and 2 wt.% to low viscosity MGS-LR285 adhesive, and the ratio of increase in failure loads is 31% and 63%, respectively. Moreover, by adding 2 wt.% functionalized boron carbide nanoparticles to the Araldite 2011 and MGS-LR285 adhesives, the strength of the joints increased by about 27% and 70%, respectively.
8
Altmann, Alinne Segatto Pires, Fabricio Mezzomo Collares, Gabriela de Souza Balbinot, Vicente Castelo Branco Leitune, Antonio Shigueaki Takimi e Susana Maria Werner Samuel. "Niobium pentoxide phosphate invert glass as a mineralizing agent in an experimental orthodontic adhesive". Angle Orthodontist 87, n. 5 (7 luglio 2017): 759–65. http://dx.doi.org/10.2319/122417-140.1.
Testo completoAbstract (sommario):
ABSTRACT Objective: The aim of this study was to develop an experimental orthodontic adhesive and evaluate how adding phosphate invert glass containing niobium pentoxide (PIG-Nb) affected the adhesive's properties. Material and Methods: PIG-Nb was added at 1, 2.5, and 5 wt% to experimental adhesive (75 wt% bisphenol A methacrylate [BisGMA], 25 wt% triethylene glycol dimethacrylate [TEGDMA], 5 wt% colloidal silica and photoinitiator system). The adhesives were evaluated for mineral deposition, degree of conversion (DC), softening solvent by Knoop microhardness (KNH) variation, pH changes, and shear bond strength (SBS). One-way analysis of variance (ANOVA) (DC and ΔKHN%), two-way ANOVA (SBS), repeated measures ANOVA (pH), and paired test (KNH1 and KNH2) were used at a significance level of P < .05. Results: Adding PIG-Nb to orthodontic adhesives induced deposition on its surface associated with a constant neutral pH. The SBS increased after immersion in artificial saliva, and the PIG-Nb5 exhibited less softening. Conclusion: The addition of PIG-Nb into orthodontic adhesives induced mineral deposition. Experimental orthodontic adhesive containing 5% wt of PIG-Nb exhibited increased mineral deposition and suitable properties for orthodontic applications.
9
Antosik, Adrian Krzysztof, Karolina Mozelewska e Konrad Gziut. "Influence of UV on the self-adhesive properties of silicone pressure-sensitive adhesives". Polimery 68, n. 1 (19 gennaio 2023): 19–24. http://dx.doi.org/10.14314/polimery.2023.1.3.
Testo completoAbstract (sommario):
The paper presents the results of research on the UV radiation influence on the self-adhesive properties of silicone adhesives. The adhesives were obtained by cross-linking commercial resins (PSA 590, Q2-7566) at the temperature of 110°C, using different amounts (0–3 wt%) of bis(2,4-dichlorobenzoyl) peroxide. Self-adhesive properties of adhesives such as adhesion, tack, and durability before and after aging were determined. The adhesives showed stable self-adhesive properties, however, the PSA 590 adhesive had a higher maximum operating temperature than the Q2-7566 adhesive.
10
Karpiesiuk, Jacek, e Tadeusz Chyzy. "The effects of various parameters on the strengths of adhesives layer in a lightweight floor system". Open Engineering 10, n. 1 (10 giugno 2020): 443–53. http://dx.doi.org/10.1515/eng-2020-0057.
Testo completoAbstract (sommario):
AbstractThe article presents the results of shear and tensile strength of deformable cement adhesives, reinforced by fiberglass mesh with a different weight in a lightweight floor system without screeds. The substrate under adhesive was EPS and XPS thermal insulation. Tests were carried out in dry, wet conditions as well as during freezing and thawing. On their basis, it can be concluded that the larger contact surface of the EPS thermal insulation with the deformable adhesive C2S1 increases the adhesive’s tensile strength. This surface is not important using C2S2 adhesives or when the substrate is made from rough insulation XPS. It was generally found that the higher weight of the fibreglass mesh in deformable cement adhesives has a more favorable effect on their shear strength. Water absorption does not significantly affect the adhesion of terracotta, and in some configurations of components in this system increases it. The adhesive with the symbol C2S2 compared to C2S1 has a higher tensile and shear strength using the same materials. Frost conditions do not allow for long-term use of this type of floor construction in snow and ice protection systems. This experimental research shows that an economical solution with optimal strength consists of XPS insulation, 205 g/m2 mesh, C2S1 adhesive.
Tesi sul tema "Adhesives"
1
Apolonio, Fabianni MagalhÃes. "Stability of adhesive interface different adhesives applied to dentin". Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5181.
Testo completoAbstract (sommario):
FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgicoThere is a general consensus that resin-dentin bonds created by contemporary hydrophilic dentin adhesives deteriorate over time. One way to predict how resin-dentin interface would behave over time is aging the specimens in vitro by immersion in different solutions. The objective of this study was to evaluate the effect of immersion in NaOCl solution on the bond interface created by different adhesive systems. For this, it was used 28 human third molars that had superficial dentin exposed and composite build-ups were built on its surface using one of those adhesives, etch-and-rinse: Scothbond Multi-purpose and Single Bond, or self-etch: Clearfil SE and Adper SE. Specimens were cut into nontrimming dentin-composite beams to microtensile testing. After a period of 24 h in distilled water, sticks from each tooth were divided equally into two groups: control or aged in 10% NaOCl for 1 h. Beams were pulled until failure at crosshead speed of 1 mm/min and bond strength was calculated. Fractured sticks were analyzed and classified in: mixed fracture, cohesive in dentin and cohesive in composite; and expressed in percentage. Data from ÂTBS test were statistically analyzed using Kruskal-Wallis and Games-Howell tests. For comparison between control and aging groups was used the Mann-Whitney test (α=0.05). Two specimens from each adhesive were used to investigate the effect of NaOCl on the interfacial morphological characteristics. For that, specimens were cut in only one direction, dentin-resin discs were fixed in a glass-holder and ground with SiC papers under running water. Slices were treated by Massonâs trichrome acid staining technique to evidence collagen exposed zones and analyzed by optical microscopy. ÂTBS results showed that NaOCl solution significantly reduced bond strength comparing with the control groups for all adhesives tested. Scothbond MP (control: 39,95Â12,72; aged: 26,45Â9,90 MPa) showed the highest values and Adper SE (control: 13,21Â3,15; aged 4,95Â2,49) the lowest in both control and aging groups. Clearfil SE (control : 27,02Â6,84; aged: 16,17Â3,79) and Single Bond (control : 26,66Â8,35; aged: 11,77Â4,28) showed no difference in control groups, but after aging, Clearfil SE showed better results. Microscopic images analysis showed that NaOCl acts efficiently on degradation of collagen fibrils for all adhesive systems. Conclusion: Aging in 10% NaOCl solution reduces bond strength and modifies the interfacial morphological characteristics of the adhesive systems tested.
Hà um consenso geral de que a uniÃo resina-dentina criada pelos adesivos dentinÃrios hidrofÃlicos contemporÃneos se deterioram com o tempo. Uma maneira de prever o comportamento da interface adesiva ao longo do tempo à atravÃs do envelhecimento in vitro por imersÃo em diferentes soluÃÃes. O objetivo deste trabalho foi avaliar o efeito da imersÃo em soluÃÃo de NaOCl na interface de uniÃo criada por diferentes sistemas adesivos. Para isso, foram usados 28 terceiros molares humanos que tiveram a dentina coronÃria exposta e um platà de resina composta confeccionado sobre sua superfÃcie apÃs a aplicaÃÃo de um dos seguintes sistemas adesivos, condicionamento total: Scothbond Multi-uso e Single Bond, ou autocondicionantes: Clearfil SE e Adper SE. Os espÃcimes foram cortados pela tÃcnica nontrimming de obtenÃÃo de palitos para o teste de microtraÃÃo. ApÃs um perÃodo de 24 horas em Ãgua destilada, os palitos de cada dente foram igualmente divididos em dois grupos: controle ou envelhecido em soluÃÃo de NaOCl a 10% por 1 hora. Os espÃcimes foram tracionados atà a ruptura da uniÃo a uma velocidade de 1 mm/min e sua forÃa de uniÃo mensurada. Os palitos fraturados foram analisados e classificados em: fratura mista, coesiva em dentina e coesiva em compÃsito, e os valores expressos em porcentagem. Os dados da resistÃncia de uniÃo foram estatisticamente analisados usando os testes Kruskal-Wallis e Games-Howell. Para comparaÃÃo entre os grupos controle e envelhecido foi usado o teste de Mann-Whitney (α=0.05). Dois espÃcimes de cada adesivo foram usados para investigar o efeito do NaOCl nas caracterÃsticas morfolÃgicas da interface de uniÃo. Para isso, espÃcimes foram cortados ao longo eixo em apenas uma direÃÃo e os discos de dentina-resina foram fixados em lÃmina de vidro e desgastados com lixas de SiC sob refrigeraÃÃo com Ãgua. As lÃminas foram tratadas pela tÃcnica de coloraÃÃo Ãcida de Masson para evidenciar as zonas de colÃgeno exposto e observadas atravÃs de microscopia Ãptica. Os resultados do teste de microtraÃÃo mostraram que a soluÃÃo de NaOCl reduziu significativamente a forÃa de uniÃo em comparaÃÃo aos grupos controle para todos os adesivos testados. Scothbond MU (controle: 39,95Â12,72; envelhecido: 26,45Â9,90 MPa) mostrou os maiores valores de uniÃo e Adper SE (controle: 13,21Â3,15; envelhecido 4,95Â2,49) os menores valores, tanto para o grupo controle quanto envelhecido. Clearfil SE (controle: 27,02Â6,84; envelhecido: 16,17Â3,79) e Single Bond (controle: 26,66Â8,35; envelhecido: 11,77Â4,28) nÃo mostraram diferenÃa estatÃstica nos grupos controle, mas apÃs envelhecimento, Clearfil SE mostrou melhores resultados. A anÃlise das imagens microscÃpicas mostrou que o NaOCl agiu efetivamente na degradaÃÃo das fibras de colÃgeno para todos os sistemas adesivos testados. ConclusÃo: O envelhecimento dos espÃcimes em soluÃÃo de NaOCl a 10% reduziu a resistÃncia de uniÃo e modificou as caracterÃsticas morfolÃgicas da interface adesiva para os sistemas adesivos testados.
2
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.
Testo completo
3
Risan, Jared. "Method for Compliance Controlled Adhesive Switching and Magnetically Controlled Switchable Adhesives". Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/26990.
Testo completoAbstract (sommario):
Adhesives are used in a variety of ways and are so common that they are easily overlooked. Adhesive hooks, tapes, glues, and switchable climbing mechanisms used by insects and lizards are clear examples of how adhesives are beneficial to society and nature. The development of novel switchable adhesives is a research area that is largely incomplete. In fact, very few switchable adhesives exist on the market today; hence their development would tremendously impact the adhesive industry. This thesis studies a mechanism for stiffness controlled switchable adhesion by utilizing a magnetically switchable device. The influence of nanopowder reinforcement on the compliance of polymeric-metallic composite switchable adhesives is investigated. Highly compliant composites are switched by magnetic and mechanical clamping leading to changes in compliance and adhesion. Material characterization is done with lap-shear testing while effects of reinforcement and clamping methods are studied. Ultimately, magnetic switching is consistent with a simple mechanical model.
4
Ren, Dakai. "Moisture-Cure Polyurethane Wood Adhesives: Wood/Adhesive Interactions and Weather Durability". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/29866.
Testo completoAbstract (sommario):
This project addresses two main subjects of moisture-cure polyurethane (PUR) wood adhesives: wood/PUR interactions and structure-property behavior emphasizing on weather durability. For these purposes, one simplified model PUR (MPUR) and three more commercially significant PURs (CPURs) with different hard segment contents were prepared. Separately, an early side project involved the synthesis of a 13C and 15N double-labeled polymeric methylenebis(phenylisocyanate) (pMDI) resin; this was used for the solid-state NMR characterization of isocyanate cure chemistry in wood bondline.
MPUR and a CPUR were employed to investigate whether wood/adhesive interactions influence PUR properties. Wood interactions significantly altered PUR hard/soft domain size distribution (atomic force microscopy, AFM), thermal transition temperatures (dynamic mechanical analyses, DMA), and urethane/urea hydrogen bonds (Fourier transform infrared spectroscopy, FTIR).
The effects of hard segment content on properties of PUR prepolymers, and cured PURs (films and wood composites) were studied. Hard segment content largely influenced the PURs’ molecular weights, viscosity, penetration, thermal transitions, and hard segment hydrogen bonds, but only slightly altered the dry (unweathered) bondline toughness.
Three accelerated weathering procedures were developed to evaluate CPUR bondline weather durability through mode-I fracture testing. Both hard segment content and weathering conditions were found to significantly influence the bondline weather durability. Among these weathering procedures, only one (VPSS) was able to effectively distinguish weather durability of PUR adhesives, and therefore it was selected for detailed structure-weather durability studies. PUR weather durability was found to correlate with its moisture sensitivity and hard segment softening temperature; both were provided by water-submersion DMA. Much attention was directed to the investigation of weather-induced PUR molecular changes. FTIR studies provided evidences of post-cure, hydrolytic degradation, and variation of urethane/urea hydrogen bonds. DMA presented weathering effects on PUR thermal properties. Special efforts have been made to correlate these analytical results with PUR weather durability.
A 13C and 15N double-labeled pMDI resin was synthesized and used for solid-state NMR characterization of isocyanate cure chemistry in wood bondline, particularly to detect the evidence of urethane formation. Rotational echo double resonance (REDOR) NMR clearly revealed the formation of urethane linkages, but largely overestimated their content.Ph. D.
5
Su, Bin. "Electrical, thermomechanical and reliability modeling of electrically conductive adhesives". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10425.
Testo completoAbstract (sommario):
The first part of the dissertation focuses on understanding and modeling the conduction mechanism of conductive adhesives. The contact resistance is measured between silver rods with different coating materials, and the relationship between tunnel resistivity and contact pressure is obtained based on the experimental results. Three dimensional microstructure models and resistor networks are built to simulate electrical conduction in conductive adhesives. The bulk resistivity of conductive adhesives is calculated from the computer-simulated model. The effects of the geometric properties of filler particles, such as size, shape and distribution, on electrical conductivity are studied by the method of factorial design.
The second part of the dissertation evaluates the reliability and investigates the failure mechanism of conductive adhesives subjected to fatigue loading, moisture conditioning and drop impacts. In fatigue tests it is found that electrical conduction failure occurs prior to mechanical failure. The experimental data show that electrical fatigue life can be described well by the power law equation. The electrical failure of conductive adhesives in fatigue is due to the impaired epoxy-silver interfacial adhesion. Moisture uptake in conductive adhesives is measured after moisture conditioning and moisture recovery. The fatigue life of conductive adhesives is significantly shortened after moisture conditioning and moisture recovery. The moisture accelerates the debonding of silver flakes from epoxy resin, which results in a reduced fatigue life. Drop tests are performed on test vehicles with conductive adhesive joints. The electrical conduction failure happens at the same time as joint breakage. The drop failure life is found to be correlated with the strain energy caused by the drop impact, and a power law life model is proposed for drop tests. The fracture is found to be interfacial between the conductive adhesive joints and components/substrates.
This research provides a comprehensive understanding of the conduction mechanism of conductive adhesives. The computer-simulated modeling approach presents a useful design tool for the conductive adhesive industry. The reliability tests and proposed failure mechanisms are helpful to prevent failure of conductive adhesives in electronic packages. Moreover, the fatigue and impact life models provide tools in product design and failure prediction of conductive adhesives.
6
Kon, Haruhiko. "Characterization of adhesively bonded joints using bulk adhesive properties". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01242009-063346/.
Testo completo
7
Soldado, Cañadas Piedad. "Propiedades físico-químicas, adaptación interfacial, biocompatibilidad y citotoxicidad de algunos cementos endodóncicos". Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663909.
Testo completoAbstract (sommario):
OBJETIVOS: Evaluar las propiedades físico-químicas y adaptación interfacial de los siguientes cementos endodóncicos: Endo-CPM Sealer, Activ GP Sealer, Sealepex y AH Plus. Cuantificar in vivo la respuesta de los tejidos apicales y periapicales de dientes de perro con vitalidad pulpar después de la obturación del conducto radicular con RealSeal XT y Sealapex Xpress. Estudiar la citotoxicidad in vitro, en cultivos celulares de RealSeal XT y Sealapex Xpress. Considerar la biocompatibilidad in vivo, en tejido subcutáneo de ratones, de RealSeal XT y Sealapex Xpress. MATERIAL Y MÉTODOS: Para evaluar las propiedades físico- químicas y la adaptación interfacial se realizaron los siguientes análisis: radiopacidad, variación de pH y solubilidad usando muestras de cada material y microscopía electrónica de barrido en conductos de incisivos bovinos obturados para evaluar la adaptación interfacial. Los datos se analizaron mediante pruebas paramétricas y no paramétricas (α=0,05). Para evaluar la respuesta apical y periapical de Sealapex Xpress y RealSeal XT se utilizaron 38 conductos radiculares de premolares de perro con pulpa vital. Posteriormente, se hizo un análisis histopatológico e inmunohistoquímico de los tejidos. Los datos se analizaron mediante la prueba U no paramétrica de Mann-Whitney (a=0,05). La citotoxicidad se evaluó observando la viabilidad celular con ensayo MTT (one-way ANOVA), prueba de azul de tripano (Mann- Whitney) y apoptosis celular tras el contacto con Sealapex Xpress y RealSeal XT. Para el estudio subcutáneo, se implantaron tubos de polietileno rellenos de Sealapex Xpress o RealSeal XT en 70 ratones BALB/c. Se realizó un estudio descriptivo del tejido peritubular y se evaluaron la proliferación y el edema angioblástico (prueba exacta de Fisher), además de medir el espesor (µm) de tejido granulomatoso reaccionario y recuento de neutrófilos (Kruskal-Wallis y Dunn's post test; Mann-Whitney) (α=0,05). RESULTADOS: La radiopacidad de todos los cementos endodóncicos evaluados estaban de acuerdo con los requisitos de ANSI / ADA. Endo-CPM Sealer presentó los valores más bajos de radiopacidad y AH Plus fue el cemento más radiopaco (p=0,0001). A excepción de Activ GP, que mostró valor de pH ácido, todos los demás cementos tuvieron una naturaleza química básica y liberaron iones hidroxilo. Con respecto a la solubilidad, todos los materiales cumplieron con las recomendaciones ANSI / ADA, sin diferencias estadísticamente significativas entre los cementos endodóncicos (p=0,0834). AH Plus presentó la mejor adaptación a las paredes del conducto en el tercio medio (p=0,0023) y apical (p=0,0012), mientras que los cementos Activ GP y Endo-CPM Sealer tuvieron una adaptación pobre a las paredes del conducto. Se observó un sellado biológico completo en el 50% y 22,7% de las muestras de los grupos Sealapex Xpress / gutapercha y RealSeal XT / Resilon, respectivamente. Se observó sellado biológico parcial en el 25% y 54,6% y ausencia de sellado en el 25% y 22,7% de las muestras de los grupos Sealepex Xpress / gutapercha y RealSeal XT / Resilon, respectivamente. La viabilidad celular mostró un efecto dosis- dependiente. En cuanto a la proliferación angioblástica y el edema, se observaron diferencias entre los cementos a los 7 y a los 63 días (p<0,05). Ambos cementos endodóncicos estimularon respuestas tisulares favorables. CONCLUSIONES: Todos los cementos endodóncicos, a excepción de Activ GP, fueron alcalinos y todos cumplieron con los requisitos ANSI / ADA de radiopacidad y solubilidad. La adaptación interfacial a las paredes del conducto radicular bovino del AH Plus fue superior a los demás. Sealapex Xpress y RealSeal XT mostraron biocompatibilidad tisular in vivo y permitieron el sellado del foramen apical mediante la deposición de tejido mineralizado. Tanto Sealapex Xpress como RealSeal XT mostraron un efecto tóxico dosis-dependiente. El cemento Sealapex Xpress fue menos citotóxico y más biocompatible que RealSeal XT.OBJECTIVES: to evaluate the physicochemical properties and interfacial adaptation to canal walls of Endo- CPM Sealer, Sealapex, Activ GP and AH Plus sealer and evaluate the response of apical and periapical tissues of dogs’ teeth with pulp vitality after root canal filling with the endodontic sealers Sealapex Xpress and RealSeal XT and the in vitro cytotoxicity and in vivo biocompatibility of this two sealers on the subcutaneous connective tissue of mice. METHODOLOGY: The following analyses were performed: radiopacity, pH variation and solubility using samples of each material and scanning electron microscopy of root-filled bovine incisors to evaluate the interfacial adaptation. Data were analyzed by the parametric and nonparametric tests (α=0,05). Thirty-eight root canals with vital pulp from dogs’ premolars were used. After instrumentation, the canals were filled with Sealapex Xpress and gutta-percha or Real Seal XT and Resilon cones. The teeth with surrounding tissues were subjected to histotechnical processing. Hematoxylin-eosin– stained sections were examined by conventional light microscopy for a quantitative histopathologic analysis, according to a scoring system. The subsequent sections were evaluated by immunohistochemistry for identification of mineralization markers. Data were analyzed by nonparametric Mann-Whitney U test (a = 0,05). The cytotoxicity was assessed by cell viability using the MTT assay (one-way ANOVA), trypan blue test (Mann-Whitney) and cell apoptosis by flow cytometer. For the subcutaneous study, polyethylene tubes filled with the sealers were implanted in 70 BALB/c mice. Angioblastic proliferation and edema (Fisher’s exact test) were evaluated, besides thickness measurement (µm) of the reactionary granulomatous tissue and neutrophil counts (Kruskal-Wallis and Dunn’s post test; Mann-Whitney) (α = 0,05). RESULTS: All materials were in accordance with the ANSI/ADA requirements for radiopacity. Endo-CPM Sealer presented the lowest radiopacity values and AH Plus was the most radiopaque sealer (p=0,0001). Except for ActiV GP, which was acidic, all other sealers had basic chemical nature and released hydroxyl ions. Regarding solubility, all materials met the ANSI/ADA recommendations, with no statistically significant difference between the sealers (p=0,0834). AH Plus presented the best adaptation to canal walls in the middle (p=0,0023) and apical (p=0,0012) thirds, while the sealers Activ GP and Endo-CPM Sealer had poor adaptation to the canal walls. Complete biological sealing was observed in 50% and 22,7% of the specimens of groups SX/GP and RS/R, respectively. Partial biological sealing was observed in 25% and 54,6% and absence of sealing in 25% and 22,7% of the specimens of groups SX/GP and RS/R, respectively. There were no significant differences (P > ,05) between the groups for the scores attributed to the histopathologic parameters. Positive staining for osteopontin, alkaline phosphatase, and RUNX2 was observed in both groups, especially in the periodontal ligament. MTT assay, trypan blue and analysis of apoptotic cells showed a dose-dependent direct effect: the more diluted the sealer, the less cytotoxic. Regarding the angioblastic proliferation and edema, difference between the sealers at 7 and 63 days occurred (p < 0,05). Both endodontic sealers initially promoted perimaterial tissue reaction as a foreign body granuloma and thus stimulated favorable tissue responses. CONCLUSIONS: All sealers, except for ActiV GP, were alkaline and all of them fulfilled the ANSI/ADA requirements for radiopacity and solubility. Regarding the interfacial adaptation, AH Plus was superior to the others considering the adaptation to the bovine root canal walls. Sealapex Xpress and RealSeal XT feature tissue compatibility in vivo and allow for sealing of apical opening by deposition of mineralized tissue. Both sealers showed a dose-dependent effect and promoted satisfactory subcutaneous tissue response; the sealer Sealapex Xpress was less cytotoxic and more biocompatible than RealSeal XT.
8
Xu, Botao. "Fracture mechanisms and failure criteria of adhesive joints and toughened epoxy adhesives". Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/371.
Testo completoAbstract (sommario):
Adhesive bonded applications are used widely in industry because of significant advantages such as uniform stress distribution, and the ability to join different materials. However most epoxy structural adhesives are brittle at room temperature and it is required to improve their toughness. The objective of this work was to understand the fracture of adhesive joints, failure criteria and rubber toughening mechanisms via a series of experiments and FEA modelling. Double lap joints (DLJ) bonded by commercial AV119 adhesive were studied. It was found that local strain and failure path were controlled by adhesive thickness. In order to model adhesive joints accurately and efficiently, systematic fracture tests were implemented to determine the fracture criteria. Mode-I, mode-II and mixed mode fracture energy release rates were obtained by Fixed Arm Peel, 4-point End Notched Flexure (ENF) and Mixed Mode Bending (MMB) tests. Numerical analysis was applied to determine the parameters of the Drucker-Prager material model and Cohesive Zone Model (CZM). The 3D FEA results showed good agreement with experimental results of DLJ and MMB. FEA results successfully demonstrated bonding strength, stress and strain distribution and plastic deformation; and further details were found using sub models. The rubber toughening mechanism was studied by modelling different face-centred micromodels. The stress distributions ahead of the crack tip in global DLJ models were extracted and used as the loading condition for the micromodels, so that a relationship between macromodel and micromodel has been established. It is found that Von Mises and hydrostatic stress play very important roles in the toughening mechanisms and also predicted that rubber particles with multi-layer structure have more potential to toughen epoxy resin than simple rubber particles.
9
Deplace, Fanny. "Waterborne nanostructured adhesives". Paris 6, 2008. http://www.theses.fr/2008PA066035.
Testo completoAbstract (sommario):
Nous avons étudié les propriétés d’adhésifs préparés à partir de particules de latex nanostructurées. Une méthodologie basée sur deux critères rhéologiques a été proposée pour optimiser les performances adhésives. Elle nous a permis d’identifier des stratégies applicables dans le cas particulier de PSA préparés à partir de particules de latex ayant une morphologie cœur-écorce. Une stratégie intéressante est l’activation d’une réaction de réticulation interparticule pendant le séchage du latex. Nous avons montré l’effet remarquable de cette réaction de réticulation sur les propriétés en grandes déformations. Ces propriétés sont assez bien décrites par un modèle non-linéaire combinant le modèle de Maxwell sur convecté et le modèle de Gent. Les meilleurs résultats d’adhésion sont obtenus pour des PSA préparés à partir de particules de latex ayant une fine écorce réticulée et un cœur mou et caractérisés par un net ramollissement à déformations intermédiaires suivi d’un rhéodurcissement. Dans un registre plus industriel, des performances adhésives prometteuses ont été obtenues avec des PSA préparés à partir de latex tackifiés in situ synthétisés par polymérisation en miniémulsion.
10
Manterola, Najera Julen. "Development of advanced methods to characterise the fracture behaviour of flexible bonded joints". Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/672807.
Testo completoAbstract (sommario):
Advanced joining technologies such as bonded joints play an important role to develop more efficient and durable structures. The present Thesis gives a step forward and proposes different solutions to characterise the fracture behaviour of flexible bonded joints for laboratory and industrial activities. Unlike in laboratory practices, thick and tough adhesives are applied in industrial activities. Moreover, bonded joints have multiple geometries and non-visible cracks may appear, while bonded joints are subjected to service environment. Four different subjects have been addressed to bring both fields closer: the effect of interface dimensions on the fracture behaviour, the effect of sustained loads on durability studies, the development of a new durability test for bonded joints, and the application of acoustic emissions technique for crack growth monitoring. Experimental and numerical works converge in different methods showing a great potential to be used in future projects with an industrial application.Las tecnologías de unión avanzadas como las uniones adhesivas tienen un papel relevante en el desarrollo de estructuras eficientes y duraderas. La presente Tesis propone diferentes soluciones para caracterizar el comportamiento a fractura de uniones adhesivas flexibles para actividades de laboratorio e industriales. A diferencia del laboratorio, los adhesivos que se aplican en la industria son tenaces y de gran espesor. Además, tienen múltiples geometrías, están expuestas a condiciones de servicio y se agrietan tras procesos no visibles. Se han abordado los siguientes temas para acercar la actividad de laboratorio al industrial: el efecto de la geometría de la interfaz en el comportamiento a fractura, el efecto de cargas sostenidas en estudios de durabilidad, el desarrollo de un nuevo ensayo de durabilidad y la aplicación de emisiones acústicas como técnica no destructiva para monitorizar grietas. El trabajo experimental y numérico desarrolla diferentes métodos con potencial para utilizarse en proyectos industriales.
Programa de Doctorat en Tecnologia
Libri sul tema "Adhesives"
1
Gerhard, Gierenz, e Karmann Werner, a cura di. Adhesives and adhesive tapes. Weinheim: Wiley-VCH, 2001.
Cerca il testo completo
2
Ita, Paul A., e Pam Safarek. Adhesives. Cleveland, Ohio: Freedonia Group, 1997.
Cerca il testo completo
3
Ita, Paul A., Mia Zaper e Sean T. Socha. Adhesives. Cleveland: Freedonia Group, 1999.
Cerca il testo completo
4
Centre, SATRA Technology. Adhesives. [Kettering]: SATRA, 1999.
Cerca il testo completo
5
Justin, Furness, McGrath Gareth e Materials Information Service, a cura di. Adhesives. London: Institute of Materials, 1995.
Cerca il testo completo
6
Publications, Key Note, a cura di. Adhesives. Hampton: Key Note Publications, 1992.
Cerca il testo completo
7
A, Ita Paul, Prokop Pamela, Hackle Aaron e Freedonia Group, a cura di. Adhesives. Cleveland: Freedonia Group, 2001.
Cerca il testo completo
8
Publications, Key Note, a cura di. Adhesives. 9a ed. Hampton: Key Note Publications, 1991.
Cerca il testo completo
9
Derivation and Tabulation Associates, inc. e International Plastics Selector inc, a cura di. Adhesives: Adhesives, sealants and primers. 4a ed. (San Diego, Calif: D.A.T.A., 1986.
Cerca il testo completo
10
Hussey, Bob, e Jo Wilson. Structural Adhesives. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1.
Testo completoCapitoli di libri sul tema "Adhesives"
1
Gooch, Jan W. "Adhesives". In Encyclopedic Dictionary of Polymers, 20. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_274.
Testo completo
2
Fox, Malcolm A. "Adhesives". In Glossary for the Worldwide Transportation of Dangerous Goods and Hazardous Materials, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-11890-0_1.
Testo completo
3
Paine, F. A. "Adhesives". In The Packaging User’s Handbook, 121–37. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4613-1483-7_8.
Testo completo
4
Pocius, Alphonsus V. "Adhesives". In Physical Properties of Polymers Handbook, 479–86. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-69002-5_27.
Testo completo
5
Liu, Yuan, Hao Meng, Phillip B. Messersmith, Bruce P. Lee e Jeffrey L. Dalsin. "Biomimetic Adhesives and Coatings Based on Mussel Adhesive Proteins". In Biological Adhesives, 345–78. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46082-6_15.
Testo completo
6
Millet, G. H. "Cyanoacrylate Adhesives". In Structural Adhesives, 249–307. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-7781-8_7.
Testo completo
7
Hussey, Bob, e Jo Wilson. "Acrylic Adhesives". In Structural Adhesives, 66–91. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1_16.
Testo completo
8
Hussey, Bob, e Jo Wilson. "Anaerobic Adhesives". In Structural Adhesives, 92–117. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1_17.
Testo completo
9
Hussey, Bob, e Jo Wilson. "Cyanoacrylate Adhesives". In Structural Adhesives, 118–48. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1_18.
Testo completo
10
Hussey, Bob, e Jo Wilson. "Epoxy Adhesives". In Structural Adhesives, 149–234. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1_19.
Testo completoAtti di convegni sul tema "Adhesives"
1
Sancaktar, Erol. "Fatigue Behavior of Adhesive Joints Under Biaxial Loading Conditions". In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0067.
Testo completoAbstract (sommario):
Abstract Fatigue data obtained under biaxial loading conditions for adhesively bonded joints are used to plot S-N type diagrams to assess the effects of biaxiality in loading. Independently Loaded Mixed-Mode Specimens (ILM MS) are used for data collection purposes. These specimens are basically two (steel) beams bonded to be fatigue loaded under cantilever (opening) mode while a simultaneous but physically separate in-plane (static) shear load is also induced with the aid of a small hydraulic piston embedded in the specimen. Application of such static shear loads results in different S-N behavior for the bonded joint. The model adhesives used are Metlbond 1113-2 and Metlbond 1113 solid film thermosetting adhesives similar to those commonly used in aircraft and aerospace industries. The former is an elastomer-modified epoxy adhesive and the latter is identical except that it containes a synthetic earner cloth. Thus, the effects of carrier cloth in adhesive’s S-N behavior is also assessed. Analytically, the classical linear log-log representation of the adhesive S-N data is explored and modifications necessary to reflect the effects of biaxiality in loading and also the presence of a carrier cloth are assessed. The fatigue failure results are also compared with results obtained under monotonic biaxial loading conditions.
2
Dileepa, K. D. R., K. A. Uresh e S. V. Udayakumara. "Development of a new bio-based adhesive for cardboard using latex of pterocarpus indicus". In Engineering Research Unit Symposium 2023. Engineering Research Unit, 2023. http://dx.doi.org/10.31705/eru.2023.5.
Testo completoAbstract (sommario):
Bio-based adhesives are derived from renewable resources such as plant-based materials, animal by-products, and microbial sources. Latex-based bio adhesives, specifically those made from natural latex derived from plant sources, have garnered significant research interest. While natural rubber remains the most commonly used bio source for latex adhesives, this study explores the potential of Pterocarpus indicus wild (PIW) latex as an alternative and discusses modifications that can be made to enhance its adhesive properties. Additionally, this research examines the effect of additives such as Polyvinyl Alcohol (PVA) on the adhesive properties of natural latex while evaluating their capacity for adhesive performance. The major challenges faced by existing bio-based adhesives, including low bonding strength and water resistance are acknowledged. Consequently, this study offers guidance on advancing new plant sources for bio-based adhesives, addressing the limitations of current adhesive products. Adhesives are social substances and can be defined as a mixture in a liquid or semi-liquid state, capable of joining permanently to surfaces, by an adhesive process [1]. Bio- based adhesives are a type of adhesive that is made from natural and renewable resources, such as plant-based materials [2]. These adhesives are becoming increasingly popular due to their sustainability and environmentally friendly nature, as they have a reduced carbon footprint and are biodegradable. The disadvantages of the current bio sealants can restrict their use in some circumstances. Their lower strength and longevity compared to conventional adhesives are significant drawbacks. Some bio-based adhesives are also moisture-sensitive and may lose their adhesion when exposed to moisture or high humidity [3]. Due to the higher expense of obtaining and processing natural materials, bio- based adhesive production has another disadvantage. Additionally, bio-based adhesives' scalability and broad use may be constrained by the lack of readily available natural materials. Additionally restricting their use in some applications, some bio-based adhesives have a lower shelf life than conventional adhesives.
3
Sharifi, Majid, Ian Brown, Delaney Jordan e Gyaneshwar Tandon. "Surface Tolerant Adhesives for Bonded Airframe Structures". In Vertical Flight Society 77th Annual Forum & Technology Display. The Vertical Flight Society, 2021. http://dx.doi.org/10.4050/f-0077-2021-16895.
Testo completoAbstract (sommario):
Structural adhesives with silicone-tolerant characteristics (surface tolerant adhesives) were developed, aiming to find solutions to overcome silicone contaminations present at bonding surfaces. This study overviews mechanical performance aspects of the surface tolerant adhesives with composite-to-composite and composite-to-titanium joints, where contaminated adherends were spray-coated with predetermined amounts of silicone (mold release) solutions. Shear strength values, in single lap shear mode, revealed a shear strength retention of up to nearly 80% in contaminated bonded joints with surface tolerant adhesives, when compared to nearly 20% strength retention with a control (standard aerospace-qualified) adhesive. In Mode I fracture, a substantially large resistance to fracture (cohesive-type failure) was observed with the surface tolerant adhesives, whereas a pure adhesive-type failure was observed in the control adhesive. Mechanical performance and relevant surface analyses of surface tolerant adhesives are detailed in this study.
4
Horsmon, Albert W. "Adhesives in Shipbuilding". In SNAME 5th World Maritime Technology Conference. SNAME, 2015. http://dx.doi.org/10.5957/wmtc-2015-278.
Testo completoAbstract (sommario):
Shipbuilding processes usually concentrate on cutting, treating, forming, fitting, welding and painting steel plate for the primary structures of ships. There is no doubt welding is the joining process of choice for primary steel ship structures, but adhesives are gaining ground for non-critical, secondary attachments and temporary attachments used in the shipbuilding process. NSRP Report 0528 investigated the used of adhesives to reduce the number and effects of welded temporary attachments. Since then, advances in adhesive chemical and processing technology opens up many additional applications, so the field warrants a refreshed examination.
5
Niutta, Carlo Boursier, Raffaele Ciardiello, Giovanni Belingardi e Alessandro Scattina. "Experimental and Numerical Analysis of a Pristine and a Nano-Modified Thermoplastic Adhesive". In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84728.
Testo completoAbstract (sommario):
In this work, the mechanical properties of two different adhesives compositions have been investigated both experimentally and numerically. The studied thermoplastic adhesives are Hot-Melt Adhesive (HMA). In particular, a pristine and a nanomodified adhesive with 10% in weight of iron oxide have been considered. The adhesives have been subjected to a series of single lap joint (SLJ) tests using adherends made of polypropylene copolymer. As it is well-known, the structural-mechanical behavior of adhesive joints is mostly influenced by the bonding process: thickness of adhesive as well as its application procedures and the surface preparation of adherends are among the most influencing factors. In addition, the mechanical behavior of SLJ test is particularly influenced by the correct alignment of adherends and applied load. These aspects have been investigated, analyzing the experimental results. Moreover, the experimental results have been used to develop a numerical model of the two adhesives. The numerical analysis has been carried out using the commercial software LS-DYNA. Transient nonlinear finite element analysis has been performed to simulate the mechanical behavior of the thermoplastic adhesives. In particular, the cohesive formulations of the elements have been taken into consideration after a careful literature review. In order to set-up and to validate the mechanical properties of the adhesives, the experimental SLJ tests have been simulated. The developed finite element models enable to investigate more complex joint structures where these types of adhesives are used, such as plastic piping systems and automotive applications. Further, the numerical models allow to investigate with higher accuracy and lower time different aspects such as manufacturing and non-linear effects.
6
Saiki, Naoya, Kazuaki Inaba, Kikuo Kishimoto e Hideo Senoo. "Evaluation of the Reliability of Film Adhesives Under Hygrothermal Condition". In ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52096.
Testo completoAbstract (sommario):
Mechanical evaluation method of adhesive strength for bonding IC chips in chip-stacked packages is investigated. These film adhesives are required to bond IC chips securely under JEDEC moisture/reflow test. The stress condition of film adhesives under the moisture/reflow test is analyzed by FEM to clarify proper stress condition for the adhesive test. Thermal strain, moisture expansion and strain induced by vapor pressure is considered. It is found that the shear stress is the main loading factor on reflow process in the analysis. A shear test using chevron-shaped chip is proposed as the adhesive test, which apply shear load to the film adhesive at the corner of a chip. The specimen is fabricated by the same process of actual semiconductor manufacturing. The evaluation method is conducted without any problem. The proposed method is thought to be suitable for film adhesives of chip bonding.
7
Lushnikova, Elena, e A. Tinkov. "MODIFICATION OF ADHESIVES BY PROCESSING WITH A WAVE FIELD IN ORDER TO INCREASE THE STRENGTH OF WOODEN STRUCTURES". In Ecological and resource-saving technologies in science and technology. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2022. http://dx.doi.org/10.34220/erstst2021_129-132.
Testo completoAbstract (sommario):
In modern economic conditions, there is a need to solve the problem of import substitution of expensive foreign adhesives with domestic ones. The solution of this problem has led to the possibility of using various modifications of polymer adhesives. Modern wood processing plants widely use gluing operations. The strength of the adhesive joints is the main criterion for the quality of the adhesive structure. Due to the fact that glued wooden structures experience increased mechanical loads, the quality criterion of adhesive joints is especially important. To solve the problem of import substitution of foreign adhesives with domestic ones, it is necessary first of all to solve the problem of reliability of the adhesive joint. The most effective and real, as recent studies show, is a technological method based on the effects of wave fields on the glue.
8
MÜLLER, Miroslav. "RESEARCH ON MECHANICAL PROPERTIES OF SINGLE-COMPONENT EPOXY DESIGNED FOR BONDING OF STRUCTURAL JOINTS". In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.007.
Testo completoAbstract (sommario):
An adhesive bonding technology is among the basic methods of bonding. However, it is limited by several factors, e.g. a treatment of bonded surface. Structural adhesives are chemicals. It follows that there are significant differences in the mechanical properties among particular types. The aim of the research was to evaluate the mechanical properties of single-component epoxy adhesives used in the transportation industry. The effect of a surface treatment of the steel surface on bond strength was also evaluated. The tested sets were mutually compared using Anova F-test from the point of view of the influence on mechanical properties (the tensile strength of adhesives, the elongation of adhesives, the adhesive bond tensile lap-shear strength, the elongation of the adhesive bond, the impact strength and hardness). The results confirm the assumption about the different behaviour of one-component epoxy. An important part of the experiment was to evaluate the influence of the surface treatment on the bond strength. From the result of experiments it can be concluded that the adhesive SP492 (p = 0.1898) and B5103-3 (p = 0.4263) are resistant to different types of tested treatment of the bonding surface.
9
Li, C. J., G. J. Yang e A. Ohmori. "Improvement of the Properties of Thermally Sprayed Ceramic Coating by the Infiltration of the Adhesives". In ITSC2003, a cura di Basil R. Marple e Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1311.
Testo completoAbstract (sommario):
Abstract Thermally sprayed ceramic coating consists generally of porosity up to over ten percent. The existence of voids in the coating will degrade mechanical performance and corrosion resistance. The infiltration technique has been used to enhance the coating performance. In the present work, the adhesives of high strength are used as infiltrator for plasma sprayed alumina coatings to investigate the effect of the infiltration on the adhesive strength and erosion resistance. The adhesive strength of coating after infiltration is tested following ASTM-C-633 standard with the same adhesive. The commercial adhesives used are liquid types of adhesives. Alumina coatings are deposited by plasma spraying to a thickness about 500ìm. The adhesive strength of as-sprayed coating was tested using another epoxy resin adhesive. The test pieces are prepared without infiltration of adhesive into the coating. The results revealed that the infiltration of adhesive to alumina coating can improve significantly the adhesive strength and erosion resistance. The adhesive strength from 40 to 55 MPa can be obtained in spite of deposition conditions. The erosion resistance of the coating at 90 degrees can be improved by a factor about 3.
10
Meier, Tobias, Fabien Choffat e Antonino Montalbano. "Toughened 2K-epoxy adhesives: structural strengthening of steel structures". In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0898.
Testo completoAbstract (sommario):
<p>The toughness of 2C epoxy adhesives is a decisive factor of today’s high-performance adhesives used for crash-zone repair in automotive or the bonding of wind turbine blades. Adhesives using Sika’s new PU-rubber toughener are used for applications, where high impact energies or high fatigue cycles must be resisted without bond failure during the entire lifetime, such as structural strengthening of civil metal structures. Crash resistance is currently not a very widespread requirement in construction. However, such materials need to resist high fatigue cycles and therefore guarantee long prospected and resilient lifetimes while maintaining their strengthening character [4]. The unique combination of very high mechanical performance, in combination with high fracture toughness and outperforming fatigue performance is the key for enabling dedicated adhesives for strengthening of big metal structures, like steal bridges. The outstanding performance of a new adhesive for strengthening, containing the SmartCore technology, has been investigated in terms of adhesive characteristics and fatigue performance on strengthened Steel samples</p>
Rapporti di organizzazioni sul tema "Adhesives"
1
Stabler, Christopher B., Faye R. Toulan e John J. La Scala. Functionally Graded Adhesives. Fort Belvoir, VA: Defense Technical Information Center, novembre 2009. http://dx.doi.org/10.21236/ada510067.
Testo completo
2
Turner, Kimberly L. Multi-Scale Biomimetic Adhesives. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2009. http://dx.doi.org/10.21236/ada495360.
Testo completo
3
Lu, J., A. Balachandra e P. Soroushian. Bio-Inspired Dry Adhesives. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2013. http://dx.doi.org/10.21236/ada579444.
Testo completo
4
Hood, Patrick J. High-Performance Liquid Crystal Adhesives. Fort Belvoir, VA: Defense Technical Information Center, aprile 1999. http://dx.doi.org/10.21236/ada363644.
Testo completo
5
Cheung, Eugene, e Metin Sitti. Biologically Inspired Polymer Micro-Patterned Adhesives. Fort Belvoir, VA: Defense Technical Information Center, novembre 2008. http://dx.doi.org/10.21236/ada491482.
Testo completo
6
Steven J. Severtson. Development of Screenable Pressure Sensitive Adhesives. Office of Scientific and Technical Information (OSTI), novembre 2003. http://dx.doi.org/10.2172/819519.
Testo completo
7
Duncan, B., e L. Croker. Characterisation of flexible adhesives for design. National Physical Laboratory, marzo 2023. http://dx.doi.org/10.47120/npl.mgpg45.
Testo completo
8
Banks, H. T., e Kathleen L. Bihari. Analysis of Thermal Conductivity in Composite Adhesives. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2001. http://dx.doi.org/10.21236/ada453822.
Testo completo
9
Leung, Chuk L., Daniel A. Scola, Christopher D. Simone e Parag Katijar. Development of Processable, Low Cure Shrinkage Adhesives. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2003. http://dx.doi.org/10.21236/ada411520.
Testo completo
10
Ii, Shinichiro, Hajime Matsuura, Tatsumi Oonishi e Masahiro Terada. Application Development of High-Strength Structural Adhesives. Warrendale, PA: SAE International, settembre 2005. http://dx.doi.org/10.4271/2005-08-0665.
Testo completo