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Статті в журналах з теми "Interface strengthening"
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Kalcher, Constanze, Omar Adjaoud, Jochen Rohrer, Alexander Stukowski, and Karsten Albe. "Reinforcement of nanoglasses by interface strengthening." Scripta Materialia 141 (December 2017): 115–19. http://dx.doi.org/10.1016/j.scriptamat.2017.08.004.
Повний текст джерела
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Li, Y. P., G. P. Zhang, W. Wang, J. Tan, and S. J. Zhu. "On interface strengthening ability in metallic multilayers." Scripta Materialia 57, no. 2 (July 2007): 117–20. http://dx.doi.org/10.1016/j.scriptamat.2007.03.032.
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Peng, Qiuming, Bingcheng Ge, Hui Fu, Yong Sun, Qun Zu, and Jianyu Huang. "Nanoscale coherent interface strengthening of Mg alloys." Nanoscale 10, no. 37 (2018): 18028–35. http://dx.doi.org/10.1039/c8nr04805c.
Повний текст джерелаАнотація:
Nanoscale coherent boundaries have been proposed, and confirmed as an effective strategy to overcome the strength–ductility trade-off in hcp-type Mg alloys. It is believed that the pathway of nanoscale stacking fault-contraction twins would be effective for the development of other Mg alloys or other hcp-type metals with high strength as well as good ductility.
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Cho, Taehong. "Prosodic Boundary Strengthening in the Phonetics-Prosody Interface." Language and Linguistics Compass 10, no. 3 (March 2016): 120–41. http://dx.doi.org/10.1111/lnc3.12178.
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Tönshoff, H. K., A. Mohlfeld, I. Oberbeck-Spintig, and C. Marzenell. "Interface strengthening by mechanical surface treatment of substrates." Surface Engineering 14, no. 4 (January 1998): 339–45. http://dx.doi.org/10.1179/sur.1998.14.4.339.
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Yang, Fa Zhan, Guang Yao Meng, Jian Qiang Zhou, and Chang He Li. "Tool Materials Design and the Sintering Optimization Based on Interface Strengthening Theory." Advanced Materials Research 150-151 (October 2010): 447–51. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.447.
Повний текст джерелаАнотація:
Nowadays, nanocomposite tool materials are very important in engineering field for their excellent mechanical properties and stability under high temperature and have a good foreground in the coming years. However, there are lots of puzzles to be discussed in the materials design theory and the fabrication processing due to the difference between the traditional materials and the nanocomposite. In this paper, a new tool materials design method is proposed based on the interface strengthening theory. The sintering temperature and the soaking time are optimized based on the interface strengthening theory and the relative density of the tool materials is also discussed. The wild phase content can be fixed by calculating the debonding interface rate and the strength requirement of the tool materials. Meanwhile, a series of experiments are carried out to fabricate and optimized the nanocomposite tool materials under the guider of the interface strengthening theory. Results show that experimental data is in accordance well with the calculation and the interface strengthening theory.
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Li, Feng, Xiaosong Jiang, Zhenyi Shao, Degui Zhu, and Zhiping Luo. "Research Progress Regarding Interfacial Characteristics and the Strengthening Mechanisms of Titanium Alloy/Hydroxyapatite Composites." Materials 11, no. 8 (August 9, 2018): 1391. http://dx.doi.org/10.3390/ma11081391.
Повний текст джерелаАнотація:
Titanium alloy/Hydroxyapatite (HA) composites have become a hot research topic in biomedical materials, while there are some challenges concerning bioactivity and mechanical properties such as low interface adhesion at the interface between metal and ceramic, complex interfacial reactions, and so on. Nevertheless, composites with reinforced phases can reach special properties that meet the requirements of biomedical materials due to the strong interfacial interactions between reinforcing phases (nano-carbon, partial oxides, and so on) and Titanium alloys or HA. This review summarizes the interface properties and mechanisms of Titanium alloy/HA composites, including interfacial bonding methods, strengthening and toughening mechanisms, and performance evaluation. On this basis, the interface characteristics and mechanisms of the Titaniumalloy/HA composites with enhanced phase are prospected. The results show that the interfacial bonding methods in the Titanium alloy/HA composites include chemical reactions and mechanical effects. The strengthening and toughening mechanisms contain grain refinement strengthening, second phase strengthening, solution strengthening, cracks and pulling out mechanisms, etc. This review provides a guidline for the fabrication of biocomposites with both mechanical properties and bioactivity.
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Weng, Shayuan, Xiang Chen, Xing Yue, Tao Fu, and Xianghe Peng. "Inapparent Strengthening Effect of Twin Interface in Cu/Pd Multilayered Films with a Large Lattice Mismatch." Nanomaterials 9, no. 12 (December 13, 2019): 1778. http://dx.doi.org/10.3390/nano9121778.
Повний текст джерелаАнотація:
It has been found that there are two kinds of interfaces in a Cu/Pd multilayered film, namely, cube-on-cube and twin. However, the effects of the interfacial structure and modulation period on the mechanical properties of a Cu/Pd multilayered film remain unclear. In this work, molecular dynamics simulations of Cu/Pd multilayered film with different interfaces and modulation periods under in-plane tension are performed to investigate the effects of the interfacial structure and modulation period. The interface misfit dislocation net exhibits a periodic triangular distribution, while the residual internal stress can be released through the bending of dislocation lines. With the increase of the modulation period, the maximum stress shows an upward trend, while the flow stress declines. It was found that the maximum stress and flow stress of the sample with a cube-on-cube interface is higher than that of the sample with a twin interface, which is different from the traditional cognition. This unusual phenomenon is mainly attributed to the discontinuity and unevenness of the twin boundaries caused by the extremely severe lattice mismatch.
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Mahmud, Riaz, and Khondaker Sakil Ahmed. "Interface dependency of reinforced concrete jacketing for column strengthening." Proceedings of the Institution of Civil Engineers - Structures and Buildings 173, no. 1 (January 2020): 31–41. http://dx.doi.org/10.1680/jstbu.17.00124.
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Basak, Ganesh C., K. Dinesh Kumar, Abhijit Bandyopadhyay, and Anil K. Bhowmick. "Elegant Way of Strengthening Polymer−Polymer Interface Using Nanoclay." ACS Applied Materials & Interfaces 2, no. 10 (October 12, 2010): 2933–43. http://dx.doi.org/10.1021/am100865n.
Повний текст джерелаДисертації з теми "Interface strengthening"
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Coyer, Sean R. "Modulation of cell adhesion strengthening by nanoscale geometries at the adhesive interface." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34763.
Повний текст джерелаАнотація:
Cell adhesion to extracellular matrices (ECM) is critical to many cellular processes including differentiation, proliferation, migration, and apoptosis. Alterations in adhesive mechanisms are central to the behavior of cells in pathological conditions including cancer, atherosclerosis, and defects in wound healing. Although significant progress has been made in identifying molecules involved in adhesion, the mechanisms that dictate the generation of strong adhesive forces remain poorly understood. Specifically, the role of nanoscale geometry of the adhesive interface in integrin recruitment and adhesion forces remains elusive due to limitations in the techniques available for engineering cell adhesion environments. The objective of this project was to analyze the role of nanoscale geometry in cell adhesion strengthening to ECM. Our central hypothesis was that adhesive interactions are regulated by integrin clusters whose recruitment is determined by the nanoscale geometry of the adhesive interface and whose heterogeneity in size, spacing, and orientation modulates adhesion strength.
The objective of this project was accomplished by 1) developing an experimental technique capable of producing nanoscale patterns of proteins on surfaces for cell adhesion arrays, 2) assessing the regulation of integrin recruitment by geometry of the adhesive interface, and 3) determining the functional implications of adhesive interface geometry by systematically analyzing the adhesion strengthening response to nanoscale patterns of proteins. A printing technique was developed that patterns proteins into features as small as 90nm with high contrast and high reproducibility. Cell adhesion arrays were produced by directly immobilizing proteins into patterns on mixed-SAMs surfaces with a protein-resistant background. Colocalization analysis of integrin recruitment to FN patterns demonstrated a concentrating effect of bound integrins at pattern sizes with areas equivalent to small nascent focal adhesions. At adhesion areas below 333 × 333 nm2, the frequency of integrin recruitment events decreased significantly indicating a threshold size for integrin clustering. Functionally, pattern sizes below the threshold were unable to participate in generation of adhesion strength. In contrast, patterns between the threshold and micron sizes showed a relationship between adhesion strength and area of individual adhesion points, independent of the total available adhesion area. These studies introduce a robust platform for producing nanoscale patterns of proteins in biologically relevant geometries. Results obtained using this approach yielded new insights on the role of nanoscale organization of the adhesive interface in modulating adhesion strength and integrin recruitment.
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Rocha, Daphne Wojciechowski. "Flexural strengthening by means of a arc overlay in the tension zone." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8850.
Повний текст джерелаАнотація:
Dissertação para obtenção do Grau de Mestre em
Engenharia Civil – Perfil de EstruturasReinforced concrete structures may be flexurally strengthened in the tension zone by the addition of a new concrete layer with embedded steel reinforcement. However, the interface between the new and old concrete creates a weak area that may cause failure to occur for loads inferior to the designed. Therefore the success of this technique relies on the interface capacity to transmit stress. Surface treatments and cleanliness are the two main aspects that affect adhesion between different age concretes cast against each other. Nevertheless, the amount of steel reinforcement crossing the interface is a factor that may overcome adhesion and improve shear resistance. In the last years, several studies have been elaborated on this theme. In the present dissertation, an experimental study was conducted in order to evaluate the performance of this strengthening solution, characterize failure modes and shear resistance at the interface. Simply supported beams with a bonded concrete overlay in the tension zone were subjected to a three point bending test, and interfacial failure was forced. Three different solutions for stress transmission across the interface are analyzed. In the first solution, shear transmission relies solely on adherence, whereas the two remaining solutions were developed with the aim of evaluating the contribution of reinforcement crossing the interface. Regarding the strengthening solutions with reinforcement crossing the interface, the difference between the effect of reinforcement concentrated near the borders of the new concrete layer or equally distributed along the interface is studied. During the tests, ultimate load, deflections, steel strains, cracking and rupture modes were analyzed. The obtained values were compared among each other and with the provisions of EC2 and MC2010.
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Borges, Luana Ferreira. "Avaliação do efeito de escala nos valores de carga de colapso de interface entre concreto e polímero reforçado com fibra de carbono." Universidade Federal de Uberlândia, 2017. http://dx.doi.org/10.14393/ufu.di.2017.22.
Повний текст джерелаАнотація:
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorFAPEMIG - Fundação de Amparo a Pesquisa do Estado de Minas Gerais
Este trabalho apresenta um estudo sobre o fenômeno do deslizamento na interface entre concreto e polímero reforçado com fibra (PRF) de carbono por meio da realização e análise de ensaios experimentais. O objetivo geral é investigar o efeito de escala no descolamento entre concreto e PRF. Buscou-se analisar a influência da variação da dimensão do corpo de prova de concreto no colapso de interface ao manter a mesma geometria de PRF aderida. A metodologia adotada consiste em sobrepor dois corpos de prova cilíndricos sobre o plano de seção transversal e ligados por três tiras de PRF de forma simétrica. A parte inferior do conjunto é fixa e aplica-se uma força de tração na parte superior, induzindo o surgimento de tensões de cisalhamento na interface. Foram utilizados corpos de prova moldados e extraídos de vigas de concreto, com diferentes dimensões: 5cm x 10cm, 10cm x 20cm e 15cm x 30cm. Treze geometrias diferentes do material compósito aderido foram usadas. Em alguns experimentos observou-se a ruptura no concreto, pois alcançou-se a tensão normal limite que o corpo de prova resiste antes de atingir a tensão de cisalhamento necessária para acontecer o descolamento. Isso foi notado principalmente nos corpos de prova menores, que resistem a uma força menor de tração. Não se notou uma influência da dimensão do corpo de prova na força máxima até o descolamento, tensão de cisalhamento e rigidez. Apesar de experimentos com corpos de prova menores levarem a bons resultados na análise do descolamento, verificou-se que o que limita seu uso é que muitas vezes é atingida a tensão normal limite que o concreto resiste, causando sua ruptura. Além disso, nos casos de deslizamento verificados com corpos de prova menores foi necessário utilizar uma geometria de PRF muito pequena, o que conduz a uma elevada tensão de cisalhamento máxima, exigindo o uso de um alto fator de correção. O processo de extração pode causar danos no concreto, como microfissuração, principalmente nos corpos de prova menores. Não foi possível concluir sobre a influência do uso de testemunhos no colapso de interface, mas foi notada uma alteração nas curvas de força versus deslocamento ao se usar corpos de prova extraídos, e em cada ensaio a influência foi de uma forma diferente. Não pareceu adequado analisar o deslizamento em testes com testemunhos.
This research is a study about the debonding phenomenon at interface between concrete and carbon fiber reinforced polymer (FRP) by way of performance and analysis of experimental tests. The objective of this study is to investigate the size effect in concrete and FRP debonding. The influence of variation of size concrete specimen on interface failure was analyzed when the same FRP geometry was adhered. Two concrete cylinders specimens are superimposed on plane of cross section, and the specimens are connected by three FRP pieces symmetrically adhered in the longitudinal perimeter. The lower part is fixed and the top is pulled. This induces appearance of shear stresses at interface. Different cylinders specimens made and core samples were used: 5cm x 10cm, 10cm x 20cm and 15cm x 30cm. Different thirteen geometries of the composite material were adhered. The failure happened in concrete in some experiments because concrete reached the normal strength before the shear stress required for the debonding, especially in smaller specimens because the tensile load carrying capacity for these cases is lower. An influence of specimen size was not noticed in the maximum load and shear stresses for debonding, and stiffness. Although experiments with smaller specimens generate good results, the reason that limits their use is the fact that the concrete often reaches the normal stress capacity. In addition, a very small FRP geometry was used in tests of debonding with smaller specimens. The use of a small FRP geometry resulted in a high shear stress, and with this use, it is necessary to use a high correction factor. The extraction process can cause damage to concrete such as micro cracking, especially in smaller specimens. It was not conclude about the influence of use of core samples in interface failures, but a change of the load versus displacement graph was noted. The influence of use of core samples happened differently in each test. An debonding analysis in tests with core samples may not be appropriate.
Dissertação (Mestrado)
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Ma, Yu. "Effects of TiB2 nanoparticles on the interfacial precipitation and mechanical properties of Al-Zn-Mg-Cu matrix composites." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS252.
Повний текст джерелаАнотація:
L’influence des renforts nanoparticules de TiB2 (6 wt.%) sur la précipitation interfaciale de la phase (Zn1.5Cu0.5)Mg, la résistance à la traction et la fissuration sous chargement de fatigue (fatigue crack growth-FCG) des composites à matrice de Al-Zn-Mg-Cu ont été étudiées. Des échantillons de composites ont été obtenus par réaction in-situ pendant le moulage suivi d’un FSP (friction stir processing) et une extrusion à chaud. Seuls les échantillons moulés et extrudés ont été utilisés pour étude de FCG à cause de la limitation de la taille après FSP. Des observations au microscope électronique à balayage (SEM), avec la diffraction des électrons rétrodiffusés (SEM/EBSD) et au microscope électronique en transmission à haute résolution (HRSTEM) ont été réalisées pour caractériser la microstructure.Des échantillons présentent une structure des grains équi-axiaux et des nanoparticules de TiB2 sont distribuées de façon homogène dans la matrice. En état de solution solide, l’interface TiB2/Al est de nature semi-cohérente et très propre. En état de vieillissementou ou sur vieillissement, la précipitation interfacaile hétérogène de la phase (Zn1.5Cu0.5)Mg a été observée. La cinétique de la précipitation interfaciale a été discutée. Les interfaces entre Al/(Zn1.5Cu0.5)Mg/TiB2 sont quasi cohérentes et l’interface TiB2/Al a été renforcée grâce à la réduction de l’énergie de l’interface. Ce mécanisme de précipitation interfaciale peut expliquer l’effet de renforcement de l’interface contribuant simultanement l’augmentation de la résistance et de l’élongation des échatillons de composite.La majorité de nanoparticules TiB2 tentent de s’agglomérer le long des joints de grains dans des échantillons sans FSP. La vitesse de croissance de fissure a été augmentée à l’intérieur des grains avec un facteur d’intensité (ΔK) intermédiaire ou important à cause de l’affinement de grains. Cependant, la vitesse de croissance de fissure a été diminuée aux joints de grains avec (ΔK) faible ou intermédiaire à cause de la présence des clusters de TiB2 tandis que cette vitesse augmente avec (ΔK) important à cause de la coalescence des microporesThe influences of TiB2 reinforcement nanoparticles (6 wt.%) on the interfacial precipitation of (Zn1.5Cu0.5)Mg phase, the associated tensile and fatigue crack growth (FCG) properties of the Al-Zn-Mg-Cu matrix composites have been studied. The composite samples were produced by in-situ reaction during casting followed by friction stir processing (FSP) and hot extrusion, while only casted and extruded samples were used for evaluating FCG due to size limit of the nugget zone after FSP. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and high-resolution scanning transmission electron microscopy (HRSTEM) were employed for the microstructure characterization.The as-processed composite samples contain the fine equiaxed-grain structure, where TiB2 nanoparticles are homogenously distributed. At solid-solution state, the TiB2/Al interfaces are featured by the clean and semi-coherent nature. At the peak-aged and overaged states, the interface precipitate determined as (Zn1.5Cu0.5)Mg phase was formed, and the underlying heterogeneous interfacial precipitation kinetics was discussed. The Al/(Zn1.5Cu0.5)Mg/TiB2 multi-interfaces were revealed to be almost coherent, and the TiB2/Al interfaces were thus strengthened due to the greatly reduced coherency strains. This mechanism was proposed as precipitation assisted interface strengthening, which has contributed to the simultaneously enhanced tensile strength and uniform elongation of the as-processed composite.The majority of TiB2 nanoparticles tend to aggregate along grain boundaries (GBs) in the composite samples without FSP. The FCG rate is increased inside grains at intermediate and high stress intensity factor (ΔK) ranges due to the refined grain size. However, the FCG rate at the GBs is decreased at the low and intermediate ΔK ranges by fatigue crack deflection and trapping due to the presence of TiB2 clusters, while it increases at the high ΔK range due to microvoid coalescence
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Canaval, Júnior Henrique. "Estudo experimental do comportamento de vigas de concreto armado reforçadas à flexão por meio de graute, armaduras e conectores / Júnior Henrique Canaval." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17853.
Повний текст джерелаАнотація:
Universidade Federal de UberlândiaEste trabalho é relativo a uma investigação experimental sobre reforço à flexão de vigas de concreto armado e a influência de um tipo de conector. O programa experimental foi constituído de 8 conjuntos de blocos de concreto e de 15 vigas. Os blocos para ensaios de cisalhamento direto com seção transversal de 15 cm x 15 cm, sendo 4 conjuntos sem conectores e 4 com conectores. As vigas para ensaio à flexão possuíam seções transversais de 12 cm x 22 cm e comprimento de 200 cm, distribuídas em três séries de ensaio, cada uma envolvendo cinco vigas: 5 vigas utilizadas para referência, ou seja, sem reforço, 10 vigas reforçadas com superfície do substrato de textura escovada, sendo 5 delas com conectores metálicos colados no substrato. Para a confecção das vigas foi utilizado concreto usinado auto adensável de 20 MPa, 2ø12,5 mm na armadura longitudinal inferior e 2ø5 mm na armadura longitudinal superior. Os estribos foram de ø5 mm, espaçados a cada 10 cm. As vigas foram submetidas à aplicação de uma força aplicada em dois pontos, distantes de 60 cm dos apoios. Previamente a ruptura e ao serviço de reforço, todas as vigas foram submetidas à carga de projeto até a estabilização de flecha, posteriormente, a carga foi reduzida para 80 % sendo executado o reforço e finalmente ensaiadas até a ruptura. O reforço foi composto do acréscimo de 5 cm de graute nas laterais e fundo da viga em uma extensão de 140 cm, simetricamente ao centro do vão. As armaduras acrescentadas foram similares a existente na viga. A força aplicada, os deslocamentos, as deformações no aço e no concreto foram medidas. Nos ensaios de cisalhamento direto em blocos, os conectores contribuíram para o aumento da tensão média de ruptura em 70,8%. As vigas de referência romperam por flexão com cargas próximas às calculadas. Pelos resultados, o reforço à flexão foi eficiente, elevando a capacidade portante em 44 % e mudou o mecanismo de ruptura para cisalhamento no trecho sem reforço. Nas vigas com conectores o aumento foi de 47%, somente um pouco superior, pois eles não foram totalmente solicitados.
This work is based on an experimental investigation of reinforced concrete beams strengthened to flexure and the influence of a type of connector. The experimental program consisted of 8 sets of concrete blocks and 15 beams. The blocks used in shear tests with cross section of 15 cm x 15 cm, 4 sets without connectors and 4 with connectors. The beams for flexure testing had cross sections of 12 cm x 22 cm and length of 200 cm, divided in three series of the tests, each involving five beams: 5 beams was used for reference, that is, without reinforcement. 10 beams reinforced with surface brushed texture substrate, 5 of them with metal connectors bonded to the substrate. Beams were made with self-compacting concrete of 20 MPa, 2ø12,5 mm to longitudinal bottom reinforcement and 2ø5 mm at longitudinal top. The stirrups were ø5 mm and 10 cm long run. The beams were submitted to four-point load bending test. Previously to the rupture and reinforcement, all the beams were submitted to the project load up to its deflection's stabilization, later, the load was reduced to 80% and executed the reinforcement and finally tested to rupture. The reinforcement was composed of 5 cm grouting increase on the sides and bottom of the beam in a length of 140 cm, symmetrically of the center. The additional reinforcement was similar to the used in the beam. The applied force, the displacement, deformations in steel and in concrete were measured. In direct shear tests in blocks, the connectors contributed to increase in the rupture average stress in 70.8%. The reference beams broken by flexure with loads next to those calculated. The results, the flexure reinforcement was efficient, increasing the load capacity by 44% and changed the rupture mechanism to shear at the unreinforced section. At the beams with connectors the increase was of 47%, a little superior because they had not only been total requested.
Dissertação (Mestrado)
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Gallant, Nathan D. "Analysis of Integrin-mediated Cell Adhesion Strengthening Using Surfaces Engineered to Control Cell Shape and Focal Adhesion Assembly." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7601.
Повний текст джерелаАнотація:
Cell adhesion to extracellular matrix proteins is critical to physiological and pathological processes as well as biomedical and biotechnological applications. Cell adhesion is a highly regulated process involving initial receptor-ligand binding, and subsequent clustering of these receptors and rapid association with the actin cytoskeleton as focal adhesions are assembled. Focal adhesions enhance adhesion, functioning as structural links between the cytoskeleton and the extracellular matrix and triggering signaling pathways that direct cell function. The objective of this thesis research is to develop a mechanical and biochemical analysis of the adhesion strengthening response.
Our central hypothesis was that focal adhesion size and position regulate cell adhesion strength by controlling the distribution of mechanical loading. We engineered micropatterned surfaces to control the size and position of focal adhesions in order to analyze the contributions of these specialized adhesive structures to adhesion strengthening. By applying surface micropatterning techniques, we showed robust control over cell-substrate contact area and focal adhesion assembly. Using a hydrodynamic shear assay to quantify adhesion strength to micropatterned substrates, we observed significant adhesive area- and time-dependent increases in adhesion strength. Complimentary biochemical assays allowed us to probe the role of structural proteins recruited to focal adhesions and examine the structure-function relationships between these adhesive structures and adhesion strength. These findings provide insights into the role of focal adhesions in adhesion strengthening, and may contribute to tissue engineering and biomaterials applications.
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Lima, Eduardo Sales de. "As interfaces entre o Bolsa Família e a identidade periférica à luz do fortalecimento comunitário." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/100/100134/tde-29102016-191923/.
Повний текст джерелаАнотація:
O programa federal de transferência de renda Bolsa-Família foi estudado nesta pesquisa com o objetivo de analisar a identidade local no processo de fortalecimento comunitário dos sujeitos que residem na periferia do município de São Paulo, utilizando como referência o bairro de São Miguel Paulista. Observou-se que na busca pelos direitos sociais básicos, esses sujeitos reagem a outras ações do Estado, as quais lhes negam e até mesmo silenciam a plenitude de experiências sociais e políticas no território. Neste viés, em um processo de gestão social, a renda confere condições básicas para a sobrevivência das famílias ao passo que pode sofisticar a tentativa de tutela e controle sobre as mesmas, levando-as ao silenciamento político e/ou a compactuar com a luta política dentro de limites institucionais nos quais as relações de poder encontram-se consolidadas. Para escutarmos a produção de sentidos a partir das interfaces entre o Bolsa Família e a identidade periférica em uma realidade dialética realizamos entrevistas com bolsistas. Por meio de seus discursos identificamos dispositivos cotidianos de resistência e de sociabilidade. No limite, a transferência de renda associada ao processo de pertencimento ao cotidiano da vizinhança podem impulsionar sentidos relacionados à emancipação individual e coletiva, favorecendo a construção de pontes à participação políticaThe federal program Bolsa Familia cash transfer was studied in this research in order to analyze the local identity in the community strengthening process of the individuals residing in the outskirts of São Paulo, using as reference the São Miguel Paulista neighborhood. It was observed that in the search for basic social rights, these guys react to other state actions, which they deny and even silence the fullness of social and political experiences in the territory. In this bias, in a social management process, income gives basic conditions for the survival of families while can sophisticate attempting to protection and control over them, leading them to the political silencing and / or condoning the political struggle within institutional boundaries in which power relations are consolidated. To listen to the production of meaning from the interfaces between the Bolsa Família and peripheral identity in a dialectic reality we conducted interviews with bolsistas. Through his speeches we identify everyday devices resistance and sociability. Ultimately, the transfer of income associated with the process of belonging to the neighborhood daily can boost meanings related to individual and collective emancipation, favoring the construction of bridges to political participation
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Trejo, O'Reilly José Antonio. "Synthèse d'agents de couplage, réactions de greffage en surface de fibres cellulosiques et propriétés d'interface fibres-matrices dans des matériaux composites à base de polystyrène." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0019.
Повний текст джерелаАнотація:
L’objectif principal de ce travail est la modification chimique des fibres cellulosiques, afin d'améliorer leurs propriétés interfaciales lors de leur utilisation comme renforts dans des matériaux composites à matrice polymère organique (polystyrène). La synthèse d'un nouvel agent de couplage pour le système cellulose-polystyrène a été entreprise par la voie de copolymérisation cationique. Une caractérisation complète de cet agent de couplage a été faite par ftir, analyse élémentaire, #1h-nmr, calorimétrie différentielle (dsc) et chromatographie par exclusion stérique (ces). La réactivité de ce copolymère a été vérifiée vis-a-vis des oh et des amines primaires par ftir. Les caractéristiques essentielles pour pouvoir l'utiliser comme agent de couplage sont : une bonne miscibilité avec le polystyrène (matrice), de longues chaînes (mn 20000) et la présence des groupements réactifs (isocyanates) sur la chaîne polymère. A titre comparatif, d'autres agents de couplage ayant des structures et des masses différentes ont été utilisés. Deux d'entre eux portent des anhydrides comme fonctions réactives vis-à-vis de la cellulose. La modification chimique des charges cellulosiques a été vérifiée par ftir, analyse élémentaire, microscopie a balayage (meb). De plus, l'énergie de surface des diverses dérives cellulosiques a été mesurée par goniométrie (angle de contact) et chromatographie inverse (igc). L’imperméabilisation des surfaces cellulosiques vis-à-vis des liquides polaires a été vérifiée. L’adhésion (cisaillement interfacial) entre la cellulose et le polystyrène a été mesurée par des techniques micromécaniques sur composites monofilamentaires. Les techniques utilisées ont été la multifragmentation et le déchaussement ('pull-out'). POUR LES COMPOSITES A BASE DE FIBRES CELLULOSIQUES COURTES, L'EFFET DU RENFORCEMENT A ETE VERIFIE A L'AIDE DE LA SPECTROSCOPIE DYNAMIQUE (DMA). LES PARAMETRES SUIVANTS ONT ETE ETUDIES : TAUX DE RENFORT ET FACTEUR DE FORME (LONGUEUR/DIAMETRE). LE MODELE D'HALPIN-KARDOS REPRESENTE CORRECTEMENT LE COMPORTEMENT DE NOS MATERIAUX.
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Fernandes, Hugo Daniel Pereira. "Strengthening of flat slabs with reinforced concrete overlay – Analysis and development of the solution." Doctoral thesis, 2019. http://hdl.handle.net/10362/88546.
Повний текст джерелаАнотація:
Strengthening of concrete structures with a new concrete layer has been commonly used for
columns, beams and slabs. This technique is economic and efficient for structural strengthening
since it uses the same base materials, steel and concrete. It is usually applied on the compressed
face of the concrete element due to concrete’s recognized behaviour under compression, posing
several challenges to control cracking and resistance when applied on the tensile face.
Strengthening of concrete structures with a new concrete layer applied on the tensile face requires
controlling the debonding phenomenon of added concrete for service and ultimate limit states.
Designing such strengthening solution requires the consideration for the strength of the global
structure and the local interface capacity for maintaining structural integrity throughout the load
history. Such requirement leads to the need for interface detailing solutions between the two
concrete layers that improve the behaviour of the composite section, namely the roughening of
the existing surface and stitching reinforcement. The knowledge from studying such interface was
applied to the strengthening of slab specimens.
This work presents the study performed on concrete unidirectional slab specimens and on columnsupported
slab specimens. All specimens were strengthened with a reinforced concrete overlay
on the tensile face. The former consisted on the flexural monotonic loading of the specimens until
failure, and the latter consisted on specimens loaded monotonically and concentrically until
failure. The calibration of numerical models based on experimental test results was also
performed with the nonlinear analysis software ATENA 3D®.
All results were then compared to current codes and regulations, and some guidelines were
defined for the correct application of strengthening with a reinforced concrete overlay on existing
structures.
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Hsieh, Chia–Tsung, and 謝嘉聰. "Detecting debonding flaws at the epoxy-concrete interface and evaluating deterioration under outdoor exposure condition of near-surface mounted CFRP strengthening beams using the Impact-echo method." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/53ygyv.
Повний текст джерелаАнотація:
博士國立中興大學
土木工程學系所
104
This thesis discusses the feasibility of using the impact–echo method (IE method) to evaluate the debonding flaws at the epoxy–concrete interfaces and the deterioration under outdoor exposure conditions of near-surface mounted carbon fiber reinforced polymer (NSM CFRP) strengthening beams. To clarify the characteristics of the stress wave propagation caused by impact forces on NSM CFRP structures, both numerical and experimental studies were performed on the bar-like epoxy specimens with and without CFRP bars and NSM CFRP strengthening beams with various debonding statuses at the epoxy–concrete surfaces. The numerical analysis revealed that the impact responses in the bar-like epoxy specimens with and without CFRP bars were initiated by the first few cross-sectional vibration modes, and the IE test verified this result. The numerical analysis and experimental study indicated that for NSM CFRP strengthening beams without debonding flaws, the impact response spectra each featured one high-amplitude peak at the fundamental mode frequency, referred to as the dominant frequency. When debonding occurred at the epoxy–concrete interfaces of NSM CFRP strengthening beams, the impact responses revealed that the dominant frequencies decreased significantly. When the dominant frequencies instead increased to levels nearly equal to those of the fundamental frequencies of the bar-like epoxy specimens, the epoxy thoroughly debonded from the concrete interfaces. Finally, the strengthening surfaces of the NSM CFRP strengthening beams were exposed to outdoor environments; IE and loading tests were conducted when the beams were exposed to the outdoor environment for 4, 8, 12, and 48 months. The result indicated that prolonged outdoor exposure generated the debonding flaws at the epoxy–concrete interfaces, which caused a significant decrease in the dominant frequencies of the IE spectra. The loading test result revealed a decrease in the load-carrying capacity due to debonding damages at the epoxy–concrete interfaces. According to the characteristics of the aforementioned impact responses, the IE method is capable of detecting the debonding flaws at epoxy–concrete interfaces and can evaluate the deterioration of the NSM CFRP strengthening beams under prolonged outdoor exposure.
Частини книг з теми "Interface strengthening"
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Chaker, Mahdi, Michael Cimerola, and Marietta Scanlon. "Strengthening Connections: Intuitive Interfaces for Life Story Work in Elder Care." In Communications in Computer and Information Science, 287–92. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21380-4_49.
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Evans, John R. "16. The Academic-Commercial Interface in a Knowledge-Driven Economy: A View from MaRS." In Creating Knowledge, Strengthening Nations, edited by Glen A. Jones, Patricia McCarney, and Michael L. Skolnik. Toronto: University of Toronto Press, 2005. http://dx.doi.org/10.3138/9781442673564-019.
Повний текст джерела
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Pineda, Roger Gacula. "Remediating Interaction." In Advances in Media, Entertainment, and the Arts, 75–98. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5023-5.ch004.
Повний текст джерелаАнотація:
The concept of interaction is foundational in technology interface design with its presuppositions being taken for granted. But the interaction metaphor has become ambiguous to the extent that its application to interface design contributes to misalignments between peoples' expected and actual experience with computer-enhanced actions. This chapter re-examines the presuppositions governing human-computer interaction with the motivation of strengthening weaknesses in their foundational concepts, and contributing a theoretical framework to designing for artistic as well as mundane experience. It argues for abandoning the interaction metaphor to refocus design discourse toward the intermediation and mediation roles of technology interfaces. Remediation (i.e., representation of one medium in another) is proposed as a conceptual model that more precisely describes the human-to-computer actions.
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Anunciação, Luis, and Anna Carolina Portugal. "A Case Study on Strengthening the Link Between Psychometrics, Assessment, and Intervention in Autism Spectrum Disorder (ASD)." In Advances in Early Childhood and K-12 Education, 154–71. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1431-3.ch008.
Повний текст джерелаАнотація:
A comprehensive childhood evaluation is a fundamental feature of rehabilitation. This process relies on the collection of quality data including that obtained from psychometric instruments, such as tests and scales, family interviews, and natural observations. Therefore, an evidence-based assessment counts on the interface of using psychometrically valid and reliable instruments, in addition to understanding data gathered from other sources of information. This chapter provides an overview of the key features of psychometric testing applied to childhood assessment. A case study is presented to link the psychometric instruments and its clinical utility within the assessment framework. To better accomplish this goal, this chapter is split into three sections: i. key features of psychometrics and its tools; ii. Autism Spectrum Disorder (ASD); iii. a case study to link both topics.
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Railean, Elena. "Affordances in Digital Textbook Use and Development." In Online Course Management, 2189–211. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5472-1.ch111.
Повний текст джерелаАнотація:
The affordances of digital textbooks go beyond using textbooks in the four walls of a traditional classroom. With digital textbooks, users can swipe the text to scroll; increase/decrease size of text and images and change brightness options; view and read downloaded information; interact with 3D models and images; make notes, search topics, follow hyperlinks, take quizzes, self-regulate learning and “synthesize” own textbooks and library, etc. However, there are some constraints such as overload of working memory, depending on digital devices' functionality, etc. The correlation between affordances and constraints is analyzed through identification and description of eight didactic systems with platforms maintaining learner-centered environment, interactive feedback, social media, user interface design, and desired results. In this chapter, the concept of “affordances” as a way of strengthening eight possible models explored, called “didactic systems”. The used methods are “thematic evaluation” and “comparative analysis”. The conclusion and future research is provided at the end.
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"Affordances in Digital Textbook Use and Development." In Advances in Educational Technologies and Instructional Design, 21–42. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8300-6.ch002.
Повний текст джерелаАнотація:
The affordances of digital textbooks go beyond using textbooks in the four walls of a traditional classroom. With digital textbooks, users can swipe the text to scroll; increase/decrease size of text and images and change brightness options; view and read downloaded information; interact with 3D models and images; make notes, search topics, follow hyperlinks, take quizzes, self-regulate learning and “synthesize” own textbooks and library, etc. However, there are some constraints such as overload of working memory, depending on digital devices' functionality, etc. The correlation between affordances and constraints is analyzed through identification and description of eight didactic systems with platforms maintaining learner-centered environment, interactive feedback, social media, user interface design, and desired results. In this chapter, the concept of “affordances” as a way of strengthening eight possible models explored, called “didactic systems”. The used methods are “thematic evaluation” and “comparative analysis”. The conclusion and future research is provided at the end.
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Hohaus, Vera. "Gradability and modality." In Polynesian Syntax and its Interfaces, 11–35. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198860839.003.0002.
Повний текст джерелаАнотація:
This chapter investigates the relationship between gradability and modality in a case study from Samoan (Austronesian, Oceanic; ISO 639-3: smo). It develops a compositionally transparent semantic analysis of the SILI (ONA) construction that is used both for weak priority modality and for the superlative. The chapter argues against a quantificational-modal and in favor of a degree-based analysis of the construction that relies on an underspecified and type-polymorphic measure of VALUE. Under such an analysis, several other core properties of the construction then fall out from general properties of the grammar of gradable predicates in Samoan, notably the pragmatic strengthening of the positive form to a superlative interpretation if contextually licensed.
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Stokes, Vincent. "Self-Efficacy and the Future Selves Construct." In Competency-Based and Social-Situational Approaches for Facilitating Learning in Higher Education, 136–63. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8488-9.ch007.
Повний текст джерелаАнотація:
This chapter assesses and evaluates whether or not positive interfaces between adult learners and their instructors and academic advisors affect their learning experience and the concept of their possible positive future selves. This chapter promotes the importance of strategies that support self-efficacy and the future selves construct, and raises awareness of the impact this concept can have on undergraduate adult learners' academic and personal success. In addition, this chapter focuses on an in-depth perspective from the undergraduate adult learner as to whether or not they believe they were supported by educators with regards to developing or strengthening self-efficacy and the future selves construct, and whether or not they believed these factors impacted their academic performance. The aim is to enhance the abilities of instructors and contribute ideas to full and part-time faculty members by sharing strategies to enhance teaching efforts that positively impact learning for the undergraduate adult learner.
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Stokes, Vincent. "Self-Efficacy and the Future Selves Construct." In Research Anthology on Adult Education and the Development of Lifelong Learners, 988–1009. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8598-6.ch049.
Повний текст джерелаАнотація:
This chapter assesses and evaluates whether or not positive interfaces between adult learners and their instructors and academic advisors affect their learning experience and the concept of their possible positive future selves. This chapter promotes the importance of strategies that support self-efficacy and the future selves construct, and raises awareness of the impact this concept can have on undergraduate adult learners' academic and personal success. In addition, this chapter focuses on an in-depth perspective from the undergraduate adult learner as to whether or not they believe they were supported by educators with regards to developing or strengthening self-efficacy and the future selves construct, and whether or not they believed these factors impacted their academic performance. The aim is to enhance the abilities of instructors and contribute ideas to full and part-time faculty members by sharing strategies to enhance teaching efforts that positively impact learning for the undergraduate adult learner.
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Martin, Alison E. "The Poetry of Geography: The Ansichten der Natur in English Translation." In Nature Translated, 150–86. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474439329.003.0006.
Повний текст джерелаАнотація:
This chapter discusses the salient differences between the two different contemporaneous versions of Humboldt’s Ansichten der Natur: Elizabeth Sabine’s Aspects of Nature (Longman, 1849) and Otté and Henry Bohn’s Views of Nature (Bohn, 1850). Humboldt initially wrangled with Elizabeth Sabine and her husband Edward, President of the Royal Society, over the English title but did not interfere further in the translation of this hybrid essay collection that combined science and aesthetics. The descriptive landscape ‘tableaux’ posed various translational difficulties in the strong imaginative appeal they carried but also the philosophical concepts underpinning them, for which Humboldt had created his own terms. Bohn and Otté enhanced the visual interest of the landscape features in Humboldt’s narrative by appealing more directly to the categories of the sublime and picturesque playing up contrasts between fore- and background; Sabine was more explicit in strengthening the spiritual message conveyed through landscape description.
Тези доповідей конференцій з теми "Interface strengthening"
1
zhihong, Xie, Huang Peiyan, Guo Yongchang, Deng Jun, Zhong Genquan, Jane W. Z. Lu, Andrew Y. T. Leung, Vai Pan Iu, and Kai Meng Mok. "Analysis of Interface Properties of Hybrid Pre-stressed Strengthening RC Beams with Crack." In PROCEEDINGS OF THE 2ND INTERNATIONAL SYMPOSIUM ON COMPUTATIONAL MECHANICS AND THE 12TH INTERNATIONAL CONFERENCE ON THE ENHANCEMENT AND PROMOTION OF COMPUTATIONAL METHODS IN ENGINEERING AND SCIENCE. AIP, 2010. http://dx.doi.org/10.1063/1.3452286.
Повний текст джерела
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Shao, S., and S. N. Medyanik. "Interaction of Dislocations With Interfaces in Nanoscale Multilayered Metallic Composites." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67523.
Повний текст джерелаАнотація:
Atomistic simulation studies of dislocation nucleation and propagation in nanoscale multilayered metallic systems (Cu-Ni and Cu-Nb) are performed. Nanoindentation model is used to generate dislocations at and near the surface. Interaction of the propagating dislocations with two types of interfaces (coherent and incoherent) is analyzed. In the case of coherent interface, Cu(111)-Ni(111), dislocations that initiate in Cu layer propagate through the interface into Ni. However, the interface acts as an obstacle for dislocation propagation and leads to a higher dislocation density near the interface. In the case of incoherent interface, Cu(111)-Nb(110), dislocations that initiate in Cu do not propagate into Nb and tend to accumulate in copper near the interface. In both cases, the interfaces provide mechanisms for strengthening the nanoscale multilayered metallic systems.
3
Lampropoulos, Andreas, Ourania Tsioulou, Spyridon Paschalis, and Stephanos Dritsos. "Strengthening of reinforced concrete beams: RC versus UHPFRC layers." 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.2021.0589.
Повний текст джерелаАнотація:
<p>Strengthening of Reinforced Concrete (RC) beams is of high importance for the structural upgrade of existing buildings. The majority of the existing RC structures need to be upgraded either because they are designed with old or without seismic code provisions or because of existing damages. In this study the effectiveness of the use of traditional RC layers is compared with the use of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) layers. Experimental investigation has been conducted on beams strengthened with these two techniques and the effectiveness of the examined methods has been evaluated via comparisons of the load-deflection and the interface slip results.</p>
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Fernando, D., A. Schumacher, M. Motavalli, J. G. Teng, T. Yu, and E. Ghafoori. "Fatigue Strengthening of Cracked Steel Beams With CFRP Plates." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39861.
Повний текст джерелаАнотація:
Externally bonded FRP systems offer an attractive method to improve the fatigue life of steel beams. The fatigue performance of such a strengthened beam can be further enhanced by prestressing the bonded FRP reinforcement. While a number of studies have been conducted on the fatigue strengthening of steel beams using FRP, they have generally been concerned with the overall performance of the strengthened beam, with limited attention to the behaviour of the FRP-to-steel interface and its effects. Against this background, this paper presents the preliminary results of an ongoing experimental program aiming at investigating the behaviour and fatigue failure mechanism of FRP-strengthened cracked steel beams under fatigue cyclic loading, with particular emphasis on the debonding process of the FRP reinforcement and the effect of debonding on crack propagation. The effects of prestressing and debonding on the fatigue performance of the strengthened beam are clearly demonstrated by the test results.
5
Lu, Mei-Chien. "Thermal Interface Materials Enhanced by Micro and Nanostructures." In ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipack2018-8307.
Повний текст джерелаАнотація:
Thermal Interface materials are crucial elements for packaging of power electronics. In particular, development of high temperature lead free die-attach thermal interface materials for silicon carbide wide bandgap power electronics is a challenge. Failures of power electronics package modules often occur at die-attach areas. Among major options, sintered silver shows advantages in ease of applications. Cost, reliability, and integration are concerns for technology implementation. The current study first discusses issues and status reported in literatures. Then it focuses on cost reduction and improvement of sintered silver using enhancement structures at micro and nano scales. A few design architectures are analyzed by finite element methods. The feasibility of strengthening edges and corners is also assessed. The downside of potential increase of unfavorable stresses to accelerate void coalescence would be discussed in conjunction with design concept of power electronics package modules for paths of solutions in the form of integrated module systems.
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Zhou, Yan, Chaodi Li, John E. Renaud, and James J. Mason. "Strengthening of Bone Cement by Shape Optimization of Short Fibers." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dac-48793.
Повний текст джерелаАнотація:
Poor interfacial properties between reinforcement fibers and a Polymethylmethacrylate (PMMA) matrix may result in debonding between them, which is a major failure mechanism for fiber reinforced bone cement. Optimization of the shape of the fibers can improve load transfer between the fibers and PMMA matrix, thereby providing maximum overall strength performance. This paper presents a procedure for structural shape optimization of short reinforcement fibers using finite element analyses. The composite is modeled by a representative element composed of a single short fiber embedded in PMMA matrix. In contrast to most previous work on this subject, contact elements are employed between the fiber and the matrix to model a low strength interface. Most models assume a perfect bond. Residual stress, due to matrix cure shrinkage and/or thermal stresses, is also included in the model. The design objective is to improve the stiffness of the composite. The results presented show that a threaded end, short fiber results in mechanical interlock between the fibers and the PMMA matrix, which helps to bridge matrix cracks effectively and improve the stiffness of the composite.
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Sedlmair, Roman, and Lothar Stempniewski. "CFRP Strengthening of RC tensile members with stiff and soft adhesives." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0369.
Повний текст джерелаАнотація:
<p>Single lap shear tests with externally bonded carbon fibre reinforced polymers (CFRP) laminates are carried out to examine the effect of differing adhesives on the load-slip behaviour. Displacement of the surface are measured with digital image correlation (DIC) to establish the cohesive material response for the interface. Due to the changed material properties (softer adhesive) larger effective bond lengths (from the textile to concrete) are examined. The determined cohesive laws are implemented in a numerical simulation of externally strengthened reinforced concrete (RC) tensile members to show the potential usability of softer adhesives for the strengthening technique. A change in the overall behaviour of strengthened systems and a more compatible system (plain strain distribution) could be in sight.</p>
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Faulkner, Susan D., and Y. W. Kwon. "Study of Composite Joint Strength With Carbon Nanotube Reinforcement." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61317.
Повний текст джерелаАнотація:
Strengthening of composite joints is a topic of recent research. The benefits of using locally applied carbon nanotubes to reinforce a carbon fiber composite joint were studied. The effect of carbon nanotubes on enhancing the fracture toughness and joint interface strength was investigated by performing Mode I and Mode II fracture with and without carbon nanotubes applied locally at the joint interface. During the study, the image correlation technique was used to examine the fracture mechanisms altered by the introduction of carbon nanotubes. The experimental study showed that carbon nanotubes increased the fracture toughness of the composite interface significantly, especially for the Mode II fracture, with altering the fracture mechanism.
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Sawa, Toshiyuki, and Taro Hasegawa. "Axisymmetrical Stress Analysis and Strength of Epoxy-Steel Composite Cylinders Under Push-Off Loadings." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34181.
Повний текст джерелаАнотація:
Composite parts have been used widely for lightening and strengthening mechanical parts, and it is necessary to know the contact stress distributions at the interfaces of the composites. In this paper, the interface stress distribution in composite cylinders of epoxy and steel under push-off loadings is analyzed using axisymmetrical theory of elasticity as a three-body contact problem. Analogous test was conducted to determine the relationship between the normal stress and the shear stress. Using two stress singularity parameters obtained from the numerical stress analyses and analogous test results, a method for estimating the strength of the composite cylinders was proposed. In the numerical calculations, the effects of the diameter and Young’s modulus of the solid cylinders on the interface stress distributions are clarified. It is seen that the normal stress and the sheer stress at the lower edges of the interface increase as Young’s modulus of the solid cylinders increases. It is also found seen that the normal stress increases and the sheer stress decreases as the diameter of the solid cylinders increases. The experiments were carried out for measuring the ruptured push-off loadings of the composite cylinders. In the experiments, the effects of the diameter of steel cylinders were examined. It is seen that the push-off strength increases as the diameter of the steel cylinders increases. The numerical results are in fairly good agreements with the experimental results.
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Khandaker, M., M. Dhorje, and S. Ekwaro-Osire. "Modified Weibull Failure Theory for Size Effect Prediction of Brittle Thin Film." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14926.
Повний текст джерелаАнотація:
A brittle thin film bonded to a substrate is common in MEMS components. At the edge of the interface, high stress gradients exist. It has been observed that mechanical strengthening of the thin film with decreasing film size occurs due to two constraints, namely, the microstructural constraint and the geometrical constraint. Consideration of both these constraints is required to properly predict the size effect impact on the strength of a brittle thin film. In this paper, a statistical approach is developed to predict the size effect of a brittle thin film on a substrate.
Звіти організацій з теми "Interface strengthening"
1
Nix, William D., and Alexander M. Cruickshank. Role of Interfaces in Deformation and Strengthening. Fort Belvoir, VA: Defense Technical Information Center, September 1985. http://dx.doi.org/10.21236/ada162289.
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