Relevant bibliographies by topics / Diffusion/Stress Analysis

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  2. Dissertations / Theses
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  5. Conference papers

Academic literature on the topic 'Diffusion/Stress Analysis'

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Published: 19 February 2023

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Journal articles on the topic "Diffusion/Stress Analysis"

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Fam, M., and J. C. Santamarina. "Coupled diffusion–fabric-flow phenomena: an effective stress analysis." Canadian Geotechnical Journal 33, no. 3 (July 2, 1996): 515–22. http://dx.doi.org/10.1139/t96-074.

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Concentration diffusion, fluid flow and fabric changes are coupled phenomena in fine soils. Indeed, experimental results previously presented by the authors showed the presence of a pressure front advancing ahead of the diffusing high-concentration front in bentonite and kaolinite specimens. This note presents a simple analysis of diffusion–fabric-flow coupling, based on elementary double-layer repulsion and attraction. Model predictions adequately agree with experimental data. High specific surface, high initial void ratio, and low initial pore-fluide concentration increase the sensitivity of soils to changes in pore-fluid concentration and enhance the potential development of pore pressure fronts. Key words: coupling, diffusion, clay, pore pressure, interparticle forces.
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Shigeyama, Haruhisa, A. Toshimitsu Yokobori Jr., Toshihito Ohmi, and Takenao Nemoto. "Analysis of Stress Induced Voiding Using by Finite Element Analysis Coupled with Finite Difference Analysis." Defect and Diffusion Forum 326-328 (April 2012): 632–40. http://dx.doi.org/10.4028/www.scientific.net/ddf.326-328.632.

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In this paper, the vacancy migration in Cu interconnect of large scale integration caused by stress induced voiding was calculated using the α multiplication method. Then, the effect of weight coefficient, α, on stress induced vacancy diffusion analysis was investigated and the validity of the α multiplication method was verified. Furthermore, the method of the vacancy diffusion analysis coupled with thermal stress analysis which can consider the history of thermal stress due to temperature changes was proposed. The results of the vacancy diffusion analysis coupled with the thermal stress analysis were compared with the analytical results of the vacancy migration without the effect of history of thermal stress. As a result, the maximum site of vacancy accumulation was found to be qualitatively in good agreement between them. However, the quantitative value of maximum vacancy concentration obtained by the vacancy diffusion analysis coupled with thermal stress analysis was found to be much higher and the vacancy distribution is found to be much more localized.
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Qiu, Yun, Z. X. Zhu, and Yang Zhang. "Diffusion stress analysis of spherical shell electrode." IOP Conference Series: Materials Science and Engineering 531 (September 26, 2019): 012006. http://dx.doi.org/10.1088/1757-899x/531/1/012006.

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ZENG, QIANG, NIDU JIKE, JIAHAN LIU, ZHENDI WANG, and JIYANG WANG. "FRACTAL ANALYSIS OF STRESS-DEPENDENT DIFFUSIVITY OF POROUS CEMENTITIOUS MATERIALS." Fractals 28, no. 06 (September 2020): 2050117. http://dx.doi.org/10.1142/s0218348x20501170.

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The understanding of the diffusion process and mechanisms of harmful species (e.g. chlorides) in porous cementitious materials is important to control and improve the material durability under harsh environments. In this paper, fractal analysis on the pore structure of porous cementitious materials was conducted and involved in a diffusion model. Macro material geometric parameters were considered in the model to avoid the difficulties in the measurements of microscopic pore parameters. The deformations of porous cementitious materials under the uniaxial elastic loads were considered to correct the diffusion model. The stress-affected diffusivity was displayed in an elegant expression involving some macro material parameters (e.g. total porosity, elastic modulus of solid skeleton, Poisson ratio). Results show that the effective diffusivity is greatly influenced by the porosity and stress ratio. The uniaxial elastic loads decrease the pore areas but increase the lengths of the pore channels for mass diffusion, which eventually causes the decrease of the effective diffusivity. The plots of the relative diffusivity against the stress ratio follow linear forms. The developed fractal diffusion model may help better understand the diffusion process in complex porous cementitious materials under elastic loads. Going beyond this, the fractal diffusion model may provide a new tool to predict the diffusivity of porous building materials under complex mechanical and environmental loads.
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Sethian, J. A., Jon Wilkening, and Len Borucki. "Analysis of Stress-Driven Grain Boundary Diffusion. Part I." SIAM Journal on Applied Mathematics 64, no. 6 (January 2004): 1839–63. http://dx.doi.org/10.1137/s0036139903438235.

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Cipresso, Pietro, Andrea Gaggioli, Silvia Serino, and Giuseppe Riva. "Stress Diffusion through Complex Networks." International Journal of Adaptive, Resilient and Autonomic Systems 3, no. 1 (January 2012): 46–64. http://dx.doi.org/10.4018/jaras.2012010103.

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Research has proven that stress reduces quality of life and causes many diseases. It is not clear how stress spreads among the population and how its diffusion in a society can be estimated. From a complex system perspective, this paper defines the rules of stress transmission, including input and output factors. Stress transmission flow is defined to describe an entropy-derived measure of stress between two interconnected individuals, and the analysis is extended to networked individuals to analyze stress diffusion in a theoretical setting that includes the modeling of complex networks and the use of agent-based models in a simulated framework. These approaches endow artificial, interacting agents with behavioral rules, allowing the authors to determine the important components that must be considered as the nature of the equilibrium that exists between two distinctly different classifications of individuals. The first classification is “isolated individuals” who experience self-induced stress. The second classification consists of “too connected individuals” who have a high perception of social pressure, have a higher probability of being stressed, and who are surrounded by a higher number of stressed people.
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Toribio, Jesús, Viktor Kharin, Diego Vergara, and Miguel Lorenzo. "Hydrogen Diffusion in Metals Assisted by Stress: 2D Numerical Modelling and Analysis of Directionality." Solid State Phenomena 225 (December 2014): 33–38. http://dx.doi.org/10.4028/www.scientific.net/ssp.225.33.

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Hydrogen diffusion within a metal or alloy is conditioned by the stress-strain state therein. For that reason it is feasible to consider that hydrogen diffuses in the material obeying a Fick type diffusion law including an additional term to account for the effect of the stress state represented by the hydrostatic stress. In this paper the hydrogen transport by diffusion in metals is modelled in notched specimens where loading generates a triaxiality stress state. To this end, two different approaches of stress-assisted hydrogen diffusion, one-dimensional (1D) and two-dimensional (2D), were compared in the vicinity of the notch tip in four notched specimens with diverse triaxiality level at two different loading rates. The obtained results show that the 2D approach predicts lower values of hydrogen concentration than the 1D approach, so that a loss of directionality of hydrogen diffusion, depending on both notch geometry parameters (radius and depth) and loading rate, appears when a 2D approach is considered.
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Wang, Peixin, Jiahong Wu, Xiaojing Xu, and Yueyuan Zhong. "Sharp decay estimates for Oldroyd-B model with only fractional stress tensor diffusion." Journal of Functional Analysis 282, no. 4 (February 2022): 109332. http://dx.doi.org/10.1016/j.jfa.2021.109332.

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Chen Zhen-Fei, Feng Lu, Zhao Yang, and Qi Hong-Rui. "Analysis of epitaxial morphology evolution due to stress and diffusion." Acta Physica Sinica 64, no. 13 (2015): 138103. http://dx.doi.org/10.7498/aps.64.138103.

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Sethian, J. A., Jon Wilkening, and Len Borucki. "Analysis of Stress-Driven Grain Boundary Diffusion. Part II: Degeneracy." SIAM Journal on Applied Mathematics 64, no. 6 (January 2004): 1864–86. http://dx.doi.org/10.1137/s0036139903438247.

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Dissertations / Theses on the topic "Diffusion/Stress Analysis"

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Canales, Sepúlveda Iván Eduardo. "Modeling of diffusion-induced stress in a lithium ion battery using isogeometric analysis." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/164013.

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Ingeniero Civil Mecánico
El desarrollo de baterías de litio de alta potencia es la piedra de tope para el surgimiento de vehículos eléctricos económicos y autónomos, así como para el almacenamiento de electricidad producida por fuentes renovables intermitentes. El principal desafío es la presencia de niveles de deformación y esfuerzo demasiado altos en las zonas activas de los electrodos, a causa del proceso cíclico de intercalación de litio durante la carga y la descarga, llegando incluso a producirse deformación plástica, nucleación de grietas, y fracturas, limitando la vida útil de las baterías. Modelar el fenómeno de la intercalación de litio es complejo, pues los gradientes químicos inducen campos de esfuerzos y, a su vez, los esfuerzos favorecen o dificultan la difusión química a través de la microestructura. Existen modelos que involucran la cinética molecular y la deformación de la microestructura del electrodo. Otros modelos continuos, más sencillos y más fáciles de implementar, han permitido resolver las ecuaciones diferenciales acopladas que dan cuenta del balance termodinámico del sólido involucrado. La mayoría de los modelos están restringidos a geometrías unidimensionales o muy simples. El objetivo de este trabajo es extender el uso de modelos continuos existentes a dos dimensiones, y resolver numéricamente, mediante el análisis isogeométrico, un sistema de ecuaciones diferenciales y acopladas. Con este procedimiento, se espera caracterizar la distribución de esfuerzos y concentratión en una partícula de electrodo de batería, y obtener los niveles de concentración de esfuerzos alrededor de los vacíos y las discontinuidades.
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Stamatialis, Dimitrios F., Dimitrios N. Soulas, and Merope Sanopouloua. "Mechanisms of non-fickian micromolecular diffusion in glassy polymer films: analysis of experimental sorption and concurrent dilation kinetics in the light of a differential swelling stress model." Diffusion fundamentals 11 (2009) 10, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A13930.

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Xiao, Kewei. "A diffusion-viscous analysis and experimental verification of the drying behavior in nanosilver-enabled low-temperature joining technique." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/25137.

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The low-temperature joining technique (LTJT) by silver sintering is being implemented by major manufacturers of power electronics devices and modules for bonding power semiconductor chips. A common die-attach material used with LTJT is a silver paste consisting of silver powder (micron- or nano-size particles) mixed in organic solvent and binder formulation. It is believed that the drying of the paste during the bonding process plays a critical role in determining the quality of the sintered bond-line. In this study, a model based on the diffusion of solvent molecules and viscous mechanics of the paste was introduced to determine the stress and strain states of the silver bond-line. A numerical simulation algorithm of the model was developed and coded in the C++ programming language. The numerical simulation allows determination of the time-dependent physical properties of the silver bond-line as the paste is being dried with a heating profile. The properties studied were solvent concentration, weight loss, shrinkage, stress, and strain. The stress is the cause of cracks in the bond-line and bond-line delamination. The simulated results were verified by complementary experiments in which the formation of cracks in bond-line and interface delamination was observed during the pressure-free drying of a die-attach nanosilver paste. Furthermore, the important drying parameters, such as drying pressure, low temperature drying time and temperature ramp rate of nanosilver LTJT process, are experimentally studied and analyzed with the numerical simulation. The simulated results were consistent with the experimental findings that the quality of sintered silver bond-line increases with increasing external drying pressure, with increasing low temperature drying time, and with decreasing temperature ramp rate. The insight offered by this modeling study can be used to optimize the process profile that enable pressure-free, low-temperature sintering of the die-attach material to significantly lower the cost of implementing the LTJT in manufacturing.
Ph. D.
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Shaghaghi, Tahereh. "FEM and XFEM approaches to Investigate the Hydromechanical Interactions within a jointed soft-rock slope." Thesis, Federation University Australia, 2020. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/177426.

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One of the most significant challenges of open-cut mining is to provide stability for the excavated slopes. Unrealistic predictions of the slopes’ behaviour during and after mining operations can lead to the failure of slopes, and this may pose a threat to human lives, the economy, and the environment. By excavating soft rock masses in open-cut mines, pre-existing joints can open and new joints can form behind excavated slopes. This phenomenon is due to the geotechnical character of the materials and stress relief movements of the excavated slopes. The stability of slopes in the rock masses is significantly influenced by the existence of discontinuities such as joints. The water flows in the opened joints can change the pore water pressure distribution in the slopes. The interaction between the joints and the water may impose different loading scenarios on the open-cut mines and put the safety of mining operations at risk. The analysis of slope stability can become more complicated because of the presence of water, discontinuities, and their interaction within the slopes in open-cut mines. This study investigates the hydromechanical interactions in the saturated jointed slopes due to pore water pressure changes. The second-largest open-cut mine in Australia, the Yallourn brown coal open-cut mine located in Victoria, was chosen as the case study for this research. In this study, several coupled pore fluid diffusion and stress-strain analyses are conducted using the extended finite element method (XFEM) in conjunction with the finite element method (FEM). This study firstly examines a joint aperture and pore water pressure changes of the excavated jointed slope due to installing a drainage system and backfilling in front of the slope. Secondly, a series of sensitivity analyses are carried out on the pore water pressure distribution changes to the variation of the permeability magnitude of the material and leakage properties of the joint surfaces. Finally, to control the pore water pressure of the saturated jointed slope, a series of drainage systems is designed. The arrangement and length of the drains are optimised by conducting a series of sensitivity analyses on the leakage properties of the joint and the permeability of the soft rock.
Doctor of Philosophy
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Kbibou, Mohamed. "Caractérisation in situ de la transition liquide solide par diffusion des rayons X." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0068.

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La fonderie est un procédé de mise en forme de matériaux métalliques largement utilisé pour la fabrication des piècesdans de nombreux domaines. La caractérisation des pièces de fonderie est effectuée, en général, après solidificationet extraction de la pièce du moule. Cette étude vise à développer un suivi in-situ de la solidification des alliages enutilisant une source laboratoire, ce qui permet de caractériser les évolutions et les transformations de phases ayantlieu pendant la solidification par diffraction et diffusion des rayons X. Une cellule de diffraction, permettant unecaractérisation in-situ de cette solidification par diffraction des rayons X, a été instrumentée et montée sur legoniomètre Seifert 3000 du laboratoire MSMP. Cette étude a été menée sur des alliages binaires eutectique ethypoeutectique Bi-Sn à bas point de fusion, utilisés pour décrire, à plus basse température, le comportement desalliages de fonderie type Al-Si. Des analyses microstructurales par microscopie optique et électronique ont étéeffectuées afin de décrire la microstructure des deux alliages à température ambiante et une analyse thermique apermis de définir leurs températures caractéristiques de solidification. Les spectres de diffractions obtenus à l’étatsolide cristallin ont été analysés afin de déterminer les évolutions des paramètres de mailles cristallines ainsi que lesfractions des phases constituant les alliages. Les paramètres de mailles varient considérablement avec l’augmentationde la température. Dans les deux phases l’effet de la dilatation thermique tend à dilater la maille cristalline. Dans laphase (β-Sn), qui est une solution solide dont la composition chimique en Bi varie de manière importante en fonctionde la température, l’effet de composition et de la dilatation thermique sont concomitants. A l’état liquide la fonctionde distribution radiale réduite a permis de déterminer la distribution atomique locale. Les positions des premiersproches voisins ont été identifiées et comparées à l’ordre cristallin de l’alliage solide. L’étude présentée ici a étéeffectuée sur des alliages modèles à bas point de fusion, pourra se poursuive par une analyse in-situ de l’évolution del’état de contraintes mécaniques dans l’alliage pendant sa solidification. Par la suite, l’étude pourra être effectuée surdes alliages de fonderie type Al-Si en utilisant un système mobile et miniaturisé, monté sur des moules réels defonderie sous cinétiques de solidification contrôlées
Casting is a process widely used in the industry. Usually the characterization of casting parts is performed aftersolidification and extraction from the mold. This study aims to develop an in-situ characterization of the solidificationof alloys using a laboratory source, which makes it possible to characterize the evolutions and phase transformationstaking place during solidification by X-ray diffraction and scattering. A diffraction cell, allowing an in-situcharacterization of this solidification by X-ray diffraction, was instrumented and fixed on the Seifert 3000 goniometerof MSMP laboratory. This study was conducted on low-melting Bi-Sn eutectic and hypoeutectic binary alloys, whichare used, at lower temperatures, to describe the behavior of Al-Si type casting alloys. Optical and electronicalmicrostructural analyzes were performed to describe the microstructure of the two alloys at room temperature and athermal analysis allowed to define their solidification temperatures. The diffraction spectra obtained in the crystallinesolid state were analyzed in order to determine the changes in the crystal lattice parameters as well as the fractions ofthe phases constituting the alloys. Lattice parameters vary considerably with increasing temperature. In both phasesthe effect of thermal expansion tends to dilate the crystal lattice. In (β-Sn) phase, which is a solid solution whosechemical composition in Bi varies significantly depending on the temperature, the effect of composition and thermalexpansion are simultaneous, they combine to cause important dilation of the lattice below eutectic temperature thenoppose when the composition in Bi decreases causing a contraction of the (β-Sn) lattice above the eutectic. In theliquid state, the reduced radial distribution function made it possible to determine the local atomic distribution. Thepositions of the first close neighbors have been identified and compared to the crystalline order of the solid alloy. Thestudy presented here was carried out on model alloys with a low melting point, which could be pursued by an in-situanalysis of the evolution of the state of mechanical stresses in the alloy during its solidification. Subsequently, thestudy can be carried out on Al-Si type casting alloys using a mobile and miniaturized system, mounted on realfoundry molds under controlled kinetics of solidification
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Gholami, Mohammad. "Shear Induced Migration of Particles in a Yield Stress Fluid." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502793185991791.

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Hurley, Caitlin Mae. "Kinetic study of hydrogen-material interactions in nickel base alloy 600 and stainless steel 316L through coupled experimental and numerical analysis." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14454/1/hurley.pdf.

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In France all of the nuclear power plant facilities in service today are pressurized water reactors (PWR). Some parts of the PWR in contact with the primary circuit medium, such as the steam generator tubes (fabricated in nickel base alloy A600) and some reactor core internal components (fabricated in stainless steel 316L), can fall victim to environmental degradation phenomena such as stress corrosion cracking (SCC). In the late 1950's, H. Coriou observed experimentally and predicted this type of cracking in alloys traditionally renowned for their SCC resistance (A600). Just some 20 to 30 years later his predictions became a reality. Since then, numerous studies have focused on the description and comprehension of the SCC phenomenon in primary water under reactor operating conditions. In view of reactor lifetime extension, it has become both critical and strategic to be capable of simulating SCC phenomenon in order to optimize construction materials, operating conditions, etc. and to understand the critical parameters in order to limit the damage done by SCC. This study focuses on the role hydrogen plays in SCC phenomenon and in particular H-material interactions. Hydrogen, from primary medium in the form of dissolved H gas or H from the water, can be absorbed by the alloy during the oxidation process taking place under reactor operating conditions. Once absorbed, hydrogen may be transported across the material, diffusing in the interstitial sites of the crystallographic structure and interacting with local defects, such as dislocations, precipitates, vacancies, etc. The presence of these [local defect] sites can slow the hydrogen transport and may provoke local H accumulation in the alloy. This accumulation could modify the local mechanical properties of the material and favor premature rupture. It is therefore essential to identify the nature of these H-material interactions, specifically the rate of H diffusion and hydrogen trapping kinetics at these defects. Concerning these H-trap site interactions, literature presents very few complete sets of kinetic data; it is therefore necessary to study and characterize these interactions in-depth. This work is composed of two interdependent parts: (i) the development of a calculation code capable to manage these H-material interactions and (ii) to extract the kinetic constants for trapping and detrapping from experimental results in order to fuel the simulation code and create a solid database. Due to the complexity of industrial materials (A600 and SS316L), \enquote{model materials} were elaborated using a series of thermomechanical treatments allowing for the study of simplified systems and the deconvolution of the different possible trapped and interstitial hydrogen contributions. These \enquote{model} specimens were charged with deuterium (an isotopic hydrogen tracer) by cathodic polarization. After charging, specimens were subjected to thermal desorption mass spectroscopy (TDS) analysis where the deuterium desorption flux is monitored during a temperature ramp or at an isotherm. Interstitial diffusion and kinetic trapping and detrapping constants were extracted from experimental TDS spectra using a numerical fitting routine based upon the numerical resolution of the McNabb and Foster equations. This study allowed for the determination of the hydrogen diffusion coefficient in two alloys, Ni base alloy 600 and stainless steel 316L, and the kinetic trapping and detrapping constants at two trap site types, chromium carbides and dislocations. These constants will be used to construct a kinetic database which will serve as input parameters for a numerical model for the prediction and simulation of SCC in PWRs
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Mirmasoudi, Sara. "High Temperature Transient Creep Analysis of Metals." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1452693927.

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Paulin, Carl. "Detecting anomalies in data streams driven by ajump-diffusion process." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184230.

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Jump-diffusion processes often model financial time series as they can simulate the random jumps that they frequently exhibit. These jumps can be seen as anomalies and are essential for financial analysis and model building, making them vital to detect.The realized variation, realized bipower variation, and realized semi-variation were tested to see if one could use them to detect jumps in a jump-diffusion process and if anomaly detection algorithms can use them as features to improve their accuracy. The algorithms tested were Isolation Forest, Robust Random Cut Forest, and Isolation Forest Algorithm for Streaming Data, where the latter two use streaming data. This was done by generating a Merton jump-diffusion process with a varying jump-rate and tested using each algorithm with each of the features. The performance of each algorithm was measured using the F1-score to compare the difference between features and algorithms. It was found that the algorithms were improved from using the features; Isolation Forest saw improvement from using one, or more, of the named features. For the streaming algorithms, Robust Random Cut Forest performed the best for every jump-rate except the lowest. Using a combination of the features gave the highest F1-score for both streaming algorithms. These results show one can use these features to extract jumps, as anomaly scores, and improve the accuracy of the algorithms, both in a batch and stream setting.
Hopp-diffusionsprocesser används regelbundet för att modellera finansiella tidsserier eftersom de kan simulera de slumpmässiga hopp som ofta uppstår. Dessa hopp kan ses som anomalier och är viktiga för finansiell analys och modellbyggnad, vilket gör dom väldigt viktiga att hitta. Den realiserade variationen, realiserade bipower variationen, och realiserade semi-variationen är faktorer av en tidsserie som kan användas för att hitta hopp i hopp-diffusionprocesser. De används här för att testa om anomali-detektionsalgoritmer kan använda funktionerna för att förbättra dess förmåga att detektera hopp. Algoritmerna som testades var Isolation Forest, Robust Random Cut Forest, och Isolation Forest Algoritmen för Strömmande data, där de två sistnämnda använder strömmande data. Detta gjordes genom att genera data från en Merton hopp-diffusionprocess med varierande hoppfrekvens där de olika algoritmerna testades med varje funktion samt med kombinationer av funktioner. Prestationen av varje algoritm beräknades med hjälp av F1-värde för att kunna jämföra algoritmerna och funktionerna med varandra. Det hittades att funktionerna kan användas för att extrahera hopp från hopp-diffusionprocesser och även använda de som en indikator för när hopp skulle ha hänt. Algoritmerna fick även ett högre F1-värde när de använde funktionerna. Isolation Forest fick ett förbättrat F1-värde genom att använda en eller fler utav funktionerna och hade ett högre F1-värde än att bara använda funktionerna för att detektera hopp. Robust Random Cut Forest hade högst F1-värde av de två algoritmer som använde strömmande data och båda fick högst F1-värde när man använde en kombination utav alla funktioner. Resultatet visar att dessa funktioner fungerar för att extrahera hopp från hopprocesser, använda dem för att detektera hopp, och att algoritmernas förmåga att detektera hoppen ökade med hjälp av funktionerna.
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Zhou, Xueqing. "Predicting Solute Transport in Natural Streams - A Stochastic Approach." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/5057.

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The existing theories for predicting longitudinal dispersion in straight open channels have long been recognized as inadequate when applied to natural rivers. These theories tend to grossly underestimate dispersion in real streams since an important mixing mechanism due to nonuniform river cross-section variations is not explicitly taken into account. Recognizing the important role of stream irregularities on solute transport and the analytical difficulties of classical deterministic analysis, we develop a stochastic approach for analyzing solute transport in natural streams. Variations in river width and bed elevation are conveniently represented as one-dimensional random fields, characterized by their autocorrelation functions. Advection and dispersion due to the combined effect of turbulent diffusion and nonuniform flow are described by the stochastic solute transport equation. When boundary variations are small and statistically homogeneous, a stochastic spectral technique is used to obtain closed-form stochastic solutions. In particular, closed-form expressions are obtained for effective mean solute transport velocity and effective dispersion coefficient reflecting mixing due to flow variations both within the river cross-section and in the streamwise direction. The results show that the mean behavior of solute transport in a statistically irregular stream can be described as a gradient dispersion process. The effective mean transport velocity in natural rivers is smaller than that in a corresponding uniform channel, and the effective longitudinal dispersion coefficient in natural rivers can be considerably greater than that of uniform open channels. The discrepancy between uniform channels and natural rivers increases rapidly as the variances of river width and bed elevation increase, especially when the mean flow Froude number is high.
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Books on the topic "Diffusion/Stress Analysis"

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Tanaka, Masataka. Boundary Elements XII Vol. 1: Applications in Stress Analysis, Potential & Diffusion. Computational Mechanics, 1990.

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Tanaka, M., T. Homma, and C. A. Brebbia. Boundary Element Method XII: Applications in Stress Analysis, Potential and Diffusion. WIT Press, 1990.

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Vol. 1: Applications in Stress Analysis, Potential and Diffusion. Vol. 2: Applications in Fluid Mechanics and Field Problems. Springer-Verlag Berlin and Heidelberg GmbH & Co. K, 1990.

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Tanaka, M., and C. A. Brebbia. Boundary Elements XII: Applications in Stress Analysis, Potential and Diffusion : Proceedings of the Twelth International Conference on Boundary Elem. Springer, 1991.

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5

Bokstein, Boris S., Mikhail I. Mendelev, and David J. Srolovitz. Thermodynamics and Kinetics in Materials Science. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780198528036.001.0001.

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This text presents a concise and thorough introduction to the main concepts and practical applications of thermodynamics and kinetics in materials science. It is designed with two types of uses in mind: firstly for one or two semester university course for mid- to - upper level undergraduate or first year graduate students in a materials-science-oriented discipline and secondly for individuals who want to study the materials on their own. The following major topics are discussed: basic laws of classical and irreversible thermodynamics, phase equilibria, theory of solutions, chemical reaction thermodynamics and kinetics, surface phenomena, stressed systems, diffusion and statistical thermodynamics. A large number of example problems with detailed solutions are included as well as accompanying computer-based self-tests, consisting of over 400 questions and 2000 answers with hints for students. Computer-based laboratories are provided, in which a laboratory problem is posed and the experiment described. The student can "perform" the experiments and change the laboratory conditions to obtain the data required for meeting the laboratory objective. Each "laboratory" is augmented with background material to aid analysis of the experimental results.
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Book chapters on the topic "Diffusion/Stress Analysis"

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Yang, F. Q., Y. Li, B. L. Zheng, and K. Zhang. "Interaction Between Stress and Diffusion in Lithium-Ion Batteries: Analysis of Diffusion-Induced Buckling of Nanowires." In Handbook of Mechanics of Materials, 1–20. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6855-3_59-1.

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Yang, F. Q., Yan Li, B. L. Zheng, and K. Zhang. "Interaction Between Stress and Diffusion in Lithium-Ion Batteries: Analysis of Diffusion-Induced Buckling of Nanowires." In Handbook of Mechanics of Materials, 825–44. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6884-3_59.

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Ingold, J. H. "Diffusion of Electrons in a Constant Field: Steady Stream Analysis." In Nonequilibrium Effects in Ion and Electron Transport, 329–31. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0661-0_20.

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Tuomi, Aarni, Iis Tussyadiah, and Mark Ashton. "Covid-19 and Instagram: Digital Service Innovation in Top Restaurants." In Information and Communication Technologies in Tourism 2021, 464–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65785-7_45.

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AbstractGovernments across the world have imposed strict rules on social distancing to curb the spread of Covid-19. In particular, restaurants have been impacted by government-mandated lockdowns. This study adopts a mixed methods approach to explore how Finnish high-profile restaurants used Instagram as a means for service innovation and diffusion during nine weeks of government-mandated lockdown. Comparatively analysing 1,119 Instagram posts across two time-stamps (2019 and 2020) and across 45 restaurants, as well as conducting five semi-structured interviews with restaurant managers, it is found that while the overall number of Instagram posts and likes on posts stayed relatively similar to the year prior, the number of comments increased significantly, suggesting a move towards a more didactic and dyadic form of Instagram communication. In addition, four digital service innovation strategies are identified: launching new service offerings and introducing new elements to existing service offerings, fostering social relationship with customers, exploring novel streams of revenue, and reinvigorating the brand’s image. Implications to service innovation theory and practice are discussed, along with suggestions for future research.
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Fiedler, Torben, Joachim Rösler, Martin Bäker, Felix Hötte, Christoph von Sethe, Dennis Daub, Matthias Haupt, Oskar J. Haidn, Burkard Esser, and Ali Gülhan. "Mechanical Integrity of Thermal Barrier Coatings: Coating Development and Micromechanics." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 295–307. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_19.

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Abstract To protect the copper liners of liquid-fuel rocket combustion chambers, a thermal barrier coating can be applied. Previously, a new metallic coating system was developed, consisting of a NiCuCrAl bond-coat and a Rene 80 top-coat, applied with high velocity oxyfuel spray (HVOF). The coatings are tested in laser cycling experiments to develop a detailed failure model, and critical loads for coating failure were defined. In this work, a coating system is designed for a generic engine to demonstrate the benefits of TBCs in rocket engines, and the mechanical loads and possible coating failure are analysed. Finally, the coatings are tested in a hypersonic wind tunnel with surface temperatures of 1350 K and above, where no coating failure was observed. Furthermore, cyclic experiments with a subscale combustion chamber were carried out. With a diffusion heat treatment, no large-scale coating delamination was observed, but the coating cracked vertically due to large cooling-induced stresses. These cracks are inevitable in rocket engines due to the very large thermal-strain differences between hot coating and cooled substrate. It is supposed that the cracks can be tolerated in rocket-engine application.
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Edelstein-Keshet, Leah. "Pattern Formation Inside Living Cells." In SEMA SIMAI Springer Series, 79–95. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-86236-7_5.

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AbstractWhile most of our tissues appear static, in fact, cell motion comprises an important facet of all life forms, whether in single or multicellular organisms. Amoeboid cells navigate their environment seeking nutrients, whereas collectively, streams of cells move past and through evolving tissue in the development of complex organisms. Cell motion is powered by dynamic changes in the structural proteins (actin) that make up the cytoskeleton, and regulated by a circuit of signaling proteins (GTPases) that control the cytoskeleton growth, disassembly, and active contraction. Interesting mathematical questions we have explored include (1) How do GTPases spontaneously redistribute inside a cell? How does this determine the emergent polarization and directed motion of a cell? (2) How does feedback between actin and these regulatory proteins create dynamic spatial patterns (such as waves) in the cell? (3) How do properties of single cells scale up to cell populations and multicellular tissues given interactions (adhesive, mechanical) between cells? Here I survey mathematical models studied in my group to address such questions. We use reaction-diffusion systems to model GTPase spatiotemporal phenomena in both detailed and toy models (for analytic clarity). We simulate single and multiple cells to visualize model predictions and study emergent patterns of behavior. Finally, we work with experimental biologists to address data-driven questions about specific cell types and conditions.
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Suzuki, K., M. Ochi, and H. Miura. "Stress-induced anisotropic diffusion of component elements in stacked thin-film multi-layer structures." In Recent Advances in Structural Integrity Analysis - Proceedings of the International Congress (APCF/SIF-2014), 524–28. Elsevier, 2014. http://dx.doi.org/10.1533/9780081002254.524.

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Zhou, Yingjian, and Wei Chen. "Analysis and Optimization of Low-Voltage and High-Current Matrix Current-Doubler Rectifiers Integrated Magnetic Components." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde221039.

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All parties favour the half-bridge current-doubling rectifier circuit due to its advantages: small output current pulsation, low switching voltage stress, and high anti-unbalance ability. Further integration of the secondary inductor and the transformer further reduces the size of the converter and dramatically improves the power density. This paper carefully analyzes the existing magnetic integration schemes. Combined with the characteristics of low-voltage and high-current DC converters, the secondary winding in this paper adopts the form of one turn to further reduce the loss so as to adapt to the secondary output of high current. The way the integrated magnetics are matrixed. The secondary side has a higher DC flux offset, and the magnetic core material adopts a magnetic powder core with high saturation magnetic density, which is equivalent to a distributed air gap, which significantly reduces the additional winding loss caused by the air gap diffusion magnetic flux cutting the winding. The winding loss, termination loss, core loss, and distribution parameters of single and matrix integrated magnetic components were compared and analyzed. Focus on optimization analysis. At the same time, it focuses on the influence of matrix on the DC bias and DC loss of the current-doubling rectifier core. At the same time, the leakage inductance and winding loss of the integrated magnetic components are comprehensively considered, and a compromise design is carried out further to improve the power density of the integrated magnetic components.
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S, Chitrakala. "Twitter Data Analysis." In Modern Technologies for Big Data Classification and Clustering, 124–51. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2805-0.ch005.

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Analyzing Social network data using Big Data Tools and techniques promises to provide information that could be of use in recommendation systems, personalized service and many other applications. A few of the analytics that do this include sentiment analysis, trending topic analysis, topic modeling, information diffusion modeling, provenance determination and social influence study. Twitter Data Analysis involves analyzing data specifically obtained from Twitter, both tweets and the topology. There are three major classifications on the type of analysis being performed such as Content based, Network based and Hybrid analysis. Trending Topic Analysis in the context of Content based static data analysis and Influence Maximization in the context of Hybrid analysis on data streams using the power of Big Data Analytics are discussed. A novel solution to Trending Topic analysis to generate topic evolved, conflict-free sequential sub summaries and influence maximization to handle streaming data are explained with experimental results.
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Pantic, Maja. "Affective Computing." In Encyclopedia of Multimedia Technology and Networking, Second Edition, 15–21. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-014-1.ch003.

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We seem to be entering an era of enhanced digital connectivity. Computers and Internet have become so embedded in the daily fabric of people’s lives that people simply cannot live without them (Hoffman, Novak, & Venkatesh, 2004). We use this technology to work, to communicate, to shop, to seek out new information, and to entertain ourselves. With this ever-increasing diffusion of computers in society, human–computer interaction (HCI) is becoming increasingly essential to our daily lives. HCI design was first dominated by direct manipulation and then delegation. The tacit assumption of both styles of interaction has been that the human will be explicit, unambiguous, and fully attentive while controlling the information and command flow. Boredom, preoccupation, and stress are unthinkable even though they are “very human” behaviors. This insensitivity of current HCI designs is fine for well-codified tasks. It works for making plane reservations, buying and selling stocks, and, as a matter of fact, almost everything we do with computers today. But this kind of categorical computing is inappropriate for design, debate, and deliberation. In fact, it is the major impediment to having flexible machines capable of adapting to their users and their level of attention, preferences, moods, and intentions. The ability to detect and understand affective states of a person we are communicating with is the core of emotional intelligence. Emotional intelligence (EQ) is a facet of human intelligence that has been argued to be indispensable and even the most important for a successful social life (Goleman, 1995). When it comes to computers, however, not all of them will need emotional intelligence and none will need all of the related skills that we need. Yet human–machine interactive systems capable of sensing stress, inattention, and heedfulness, and capable of adapting and responding appropriately to these affective states of the user are likely to be perceived as more natural, more efficacious, and more trustworthy. The research area of machine analysis of human affective states and employment of this information to build more natural, flexible (affective) HCI goes by a general name of affective computing, introduced first by Picard (1997).
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Conference papers on the topic "Diffusion/Stress Analysis"

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Indeitsev, D., and Yu Mochalova. "Stress stage influence on diffusion process in materials." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4912546.

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Gong, Yu-bing, and Jia-bing Xu. "Moisture diffusion and integrated stress analysis in LED module." In 2012 13th International Conference on Electronic Packaging Technology & High Density Packaging (ICEPT-HDP). IEEE, 2012. http://dx.doi.org/10.1109/icept-hdp.2012.6474846.

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Fan, Xuejun, and Jie-Hua Zhao. "Moisture diffusion and integrated stress analysis in encapsulated microelectronics devices." In Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2011. http://dx.doi.org/10.1109/esime.2011.5765793.

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Huang, Clement, James W. Liang, Alex Juan, and K. C. Su. "Diffusion ability of Stress Induced Voiding in advanced BEOL copper process." In 2012 19th IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA 2012). IEEE, 2012. http://dx.doi.org/10.1109/ipfa.2012.6306247.

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El Chamaa, Said, Mitesh Patel, Mark R. Wenman, and Catrin M. Davies. "Multiscale Stress-Diffusion Analysis of Notch-Tip Hydrogen Profiles in Zircaloy-4." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84555.

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Hydrogen pick-up in zirconium alloys can lead to their structural failure, which is an important problem in the nuclear industry. This investigation focuses on modelling the accumulation of hydrogen in the vicinity of loaded V-notches in four-point bend Zircaloy-4 specimens. In order to account for the anisotropic diffusivity of hydrogen in hexagonal close-packed α-zirconium, a multiscale methodology is proposed to compute notch-tip hydrogen profiles. This methodology unifies continuum scale stress analysis, using the finite element approach, and atomistic scale stress analysis, using the elastic dipole tensor of point defects. The steady state notch-tip hydrogen profiles are determined for different notch geometries and crystal orientations. It was found that hydrogen enhancement is greater but more localised for sharper notches with a smaller flank angles, which is the expected effect of stress. It was also found that hydrogen enhancement is greater if the notch opening plane coincides with the prism plane as opposed to the basal plane. This anisotropic effect is a consequence of the trigonal symmetry of the hydrogen interstitialcy.
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Serafin Couto Vieira, Gabriel, Gustavo Nuernberg, Nelson Yurako Londono Pabon, and Marcia Mantelli. "Stress analysis of a diffusion bonding device under loading and thermal expansion." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-5949.

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Xianghai, Chai, Wang Zhiqiang, and Tang Zhongbin. "Failure Criteria of Diffusion-Bonded Seam Under Complex Stress State." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43837.

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Diffusion-bonded titanium hollow warren structures have been successfully used on aircraft engine components, such as fan blade, etc., for which failure behavior under impact load is one of the major considerations during design. Studies show that the welding seam de-bonding is the major failure mechanisms under the impact loads. To effectively simulate the de-bonding, phenomenological effective bond strength needs to be properly defined for both the girder region and the edges. In this paper, the bond strength at the hollow region is calibrated through quasi-static tensile tests, in which the specimens are properly designed to represent the cross-section of the hollow region of a typical warren structure. Then, the strength of the edge region is estimated through an inverse method based on the analysis-test correlation of a hollow panel impact test. Such multi-factor coupled seam failure criteria can provide reasonable accordance with test result in the simulation of impact failure of the hollow structure. This means the model with such failure criteria incorporated can provide a useful reference to the aircraft engine hollow warren structure components design.
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Takeshi Terasaki, Tomio Iwasaki, Yasutaka Okura, Tomohisa Suzuki, Takahiko Kato, Masato Nakamura, and Tomoaki Hashimoto. "Evaluation of tin-whisker growth during thermal-cycle testing using stress- and mass-diffusion analysis." In 2009 IEEE 59th Electronic Components and Technology Conference (ECTC 2009). IEEE, 2009. http://dx.doi.org/10.1109/ectc.2009.5074028.

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Terasaki, Takeshi, Takahiko Kato, Tomio Iwasaki, Yasutaka Ookura, Masato Nakamura, Hideki Ishii, and Kenji Yamamoto. "Prediction of tin-whiskers generation during thermal cycle test using stress and mass-diffusion analysis." In 2012 IEEE 62nd Electronic Components and Technology Conference (ECTC). IEEE, 2012. http://dx.doi.org/10.1109/ectc.2012.6248986.

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Nassar, Sayed A., and Emad Mazhari. "A Coupled Shear Stress-Diffusion Model for Adhesively Bonded Single Lap Joints." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66083.

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In this study, a coupled shear stress-diffusion model is developed for the analysis of adhesively bonded single lap joints by applying Fickian diffusion model to the adhesive layer. Differential equations of equilibrium are formulated in terms of adhesive material properties that are time and location-dependent. By invoking a Volkersen approach on the equilibrium equations, a shear stress differential equation is formulated, and numerically solved. Several scenarios are considered for investigating the effect of diffusion on shear stress distribution in adhesively bonded single lap joints. Detailed discussion of the results is presented.
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