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Showing 1 to 20 of 22 for “"Stress effect"”.
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The bias-stress effect in pentacene organic thin-film transistors
… large-area electronics. However, the bias-stress effect (BSE) in OTFTs causes operational instability that limits the usefulness of the OTFT technology in a wide range of circuit applications. Currently, most existing studies on OTFT BSE are inadequate because of one or more of the …
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A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
… for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's …
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Thermally activated dislocation motion including inertial effects in solid solutions
… barriers which can trap the dislocations. The effect of thermal fluctuations and of a viscous drag on the motion of the dislocation is investigated by analogy with Brownian motion in a field of force. The rate of escape of a trapped dislocation is found to depend on the damping coefficient only …
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Análise da Utilização de Produtos Ambientalmente Amigáveis como Inibidores de Corrosão em Ambientes Contendo CO2
… eight blends were tested. In addition, the effects of shear stress, test duration, pH value and the iron carbonate film previously formed on the metal surface were also evaluated. The results indicated which blends are stable and capable to provide corrosion protection in the 72 hours …
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Investigation effect of external stress on hydrogen solvus in a zircaloy-4 fuel cladding alloy: application of in situ diffraction technique and mesoscale phase-field simulation
… is mainly controlled by the temperature and the stress value. The temperature effect can be modeled using the hydrogen solvus and the temperature-driven hydrogen diffusion (Soret effect). However, while correlating the effect of stress on hydride formation, a disagreement arises between the …
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Modeling of and experiments characterizing electromigration-induced failures in interconnects
… to scale downward, a detailed knowledge of stress evolution and void growth processes enables a determination of the electromigration-induced failure times of these interconnects. This thesis provides this knowledge through the development of an electromigration simulation MIT/EmSim and …
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Devaluation of Sucrose Caused by Social Instability Stress in Adolescent Male Long-Evans Rats in the Presence of an Unfamiliar Peer
Rats that undergo the Social Instability Stress procedure during adolescence (SS: daily 1-hour isolation + re-pairing with an unfamiliar cage partner for 16 days) display changes in reward-related behaviour. Specifically, SS rats spend less time in social interaction but more time in social …
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Dynamic stability of shear deformable viscoelastic composite plates
… deformations, as well as the transverse normal stress effect. The integro-differential equations governing the stability are solved for simply-supported boundary conditions by using the Laplace transform technique, thus yielding the characteristic equation of the system. In order to predict the …
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Chemical vapor sensing with novel coupled-channel field-effect transistors
… organic semiconductors suffer from the bias stress effect in atmosphere and low mobilities. Inorganic oxide semiconductors also display sensitivity to polar vapor molecules and are transparent at visible wavelengths, which makes them of interest to the display industry. Coupling disordered …
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On couple stress in the mechanics of materials
The couple stress theory as presented by Mindlin, Koiter, Stokes and others is reviewed with particular attention being given to stress concentration and size effects. That theory is compared on a qualitative and quantitative basis with Neuber's theory for stress concentration for very small or …
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Process-Induced Degradation during the Integration of Pb(Zr/x Ti/1-x)O3 Ferroelectric Capacitors
… damage, hydrogen-induced degradation, and stress effect. Since ferroelectric capacitors utilize the movement of body-centered atoms in perovskite structure, Ti or Zr in the case of Pb(Zr/x Ti/1-x)O³ (PZT), the movement can be suppressed or inhibited by many factors such as space charges, …
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Mittelspannungseinfluss bei dauerfester Auslegung von Wellen und Achsen
Geometrie, Werkstoff und Belastung sind die maßgeblichen Faktoren, welche die Dauerfestigkeit beeinflussen. Allgemein bekannt ist, dass die Dauerfestigkeit bei einer Überlagerung von ruhenden und schwingenden Belastungen geringer ist als bei rein schwingenden Belastungen. Dieser Effekt wird …
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Numerical modeling of strain localization in granular materials using Cosserat theory enhanced with microfabric properties
… grains were studied carefully to evaluate their effect on shear band characteristics. To this end, attempts have been made to bring these additional micro-properties into the constitutive equations in this study. Elasto-plastic constitutive laws with a non-associated flow rule were used in order …
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PRELIMINARY EXPERIMENTAL AND MODELING STUDY OF PRESSURE DEPENDENT PERMEABILITY FOR INDONESIAN COALBED METHANE RESERVOIRS
… resulted in significant decrease in horizontal stress and increased permeability. The permeability increase at low reservoir pressure was significant, a positive finding for Indonesian coals. Using the measured volumetric changes with variations in pressure, the cleat compressibility for the two …
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Caracterização molecular e funcional de transfatores da família NAC de soja (Glycine max)
… de vias de sinalização de resposta a diferentes estresses constitui um dos interesses majoritários de pesquisas na área de interações das plantas com o meio ambiente. Recentemente, foram identificados por nosso grupo genes de soja co-regulados por estresse osmótico e estresse no retículo, que …
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DEVELOPMENT OF FATIGUE MODELS FOR COPPER TRACES ON PRINTED WIRING ASSEMBLIES UNDER QUASI-STATIC CYCLIC MECHANICAL BENDING
… tests, finite element (FE) modeling of the stresses generated during the cyclic bending tests, and response surfaces (RS) to facilitate iterative assessment of the model constants. Cyclic three-point bend tests were conducted on land grid array (LGA) components during this investigation. …
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Micromechanical models of delamination in aluminum-lithium alloys
… secondary delamination cracks can improve the effective toughness of a component, no current model accurately predicts the initiation and growth of intergranular cracks. Since simulations cannot incorporate delamination into a structural model, designers cannot quantify the effect of …
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High Cycle Fatigue Simulation using Extended Space-Time Finite Element Method Coupled with Continuum Damage Mechanics
… and many others introduce significant residual stresses in the material, which drastically affects the fatigue life. Motivated by the need for effectively incorporating the residual stress effect in the fatigue life prediction, two approaches are developed in this thesis.In the first approach, a …
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Stress Effects on Phase Morphological and Compositional Non-uniformity in Intercalation Compounds
… out to elucidate and predict how coherency stress, which usually arises due to the solute concentration dependence of lattice parameter, impacts the evolution of phase morphology and solute composition distribution in intercalation compounds. In the first topic, the effect of coherency …
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Fabrication of reliable, self-biased and nonlinear magnetoelectric composites and their applications
The magnetoelectric (ME) effect, i.e., the induction of magnetization by an applied electric field (E) or a polarization by an applied magnetic field (H), is of great interest to researchers due to its potential applications in magnetic sensors. Moreover, the ME effect in laminate composites is …
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