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Calibri 83ffff̙̙3f3fff3f3f33333f33333.p@TU Delft Repositoryg ;uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:516151b09829493fb03a1dd8927c914fDhttp://resolver.tudelft.nl/uuid:516151b09829493fb03a1dd8927c914f@A level set model for stress dependent corrosion pit propagation9Dekker, R.; van der Meer, F.P.; Maljaars, J.; Sluys, L.J.A numerical model for corrosion pit propagation under mechanical loading is presented. The level set method is used for corrosion front tracking and also enables the domain to be split into a solid and a pit domain. In the pit the diffusion of atoms originating from the dissolution process occurring at the pit front is simulated. The model is capable of automatically capturing lacy cover formation due to the inclusion of activation control, diffusion control and passivation. In the solid static equilibrium is solved to obtain strains and stresses. A parameter, dependent on the signs of the plastic strain increment and the back stress, is introduced to define the influence of plasticity on the corrosion rate. The model is used to study pit growth under electrochemical and mechanical loading. Under activation control combined with an elastic material response, pits propagate faster under constant loading than under cyclic loading. When plastic deformation occurs, cyclic loading can significantly increase the pit growth rate. Increasing the cyclic load frequency results in faster propagation due to kinematic hardening. Under diffusion control, mechanical loading does not influence the pit growth rate, given that the salt layer leading to diffusion control remains intact.wPitting corrosion; Corrosion fatigue; Level set method; Multiphysics; Buildings and Infrastructures; 2015 Urbanisationenarticle)uuid:c83982aee1394d6ab02ee7a0b0f138afDhttp://resolver.tudelft.nl/uuid:c83982aee1394d6ab02ee7a0b0f138afqPrediction of the deformed geometry of vat photopolymerized components using a multiphysical modeling frameworkTWestbeek, S.; Remmers, J.J.C.; van Dommelen, J.A.W.; Maalderink, H.H.; Geers, M.G.D.eIn photopolymerizationbased additive manufacturing a complex interplay exists between the vat photopolymerization process characteristics and the (photoactive) resin s material properties, which governs the trajectory from the input target geometry to the resulting true geometry of a printed component. Particularly for fine featured geometries, there might be a clear mismatch between the latter two. Determining whether the entire component is printable can only be properly assessed through a testprint. The current work proposes an alternative modelingdriven route, which, after system and material characterization, facilitates predicting the geometrical defects of the resulting solidified component (including deformation). This is enabled through a coupled multiphysical modeling of irradiation, photopolymerization, solidification and chemical shrinkage.Additive manufacturing; Vat photopolymerization; Digital light processing; Multiphysical modeling; Process simulation; Validation study; Mechanical analysisElsevier)uuid:aa536591fb4b4e489d13df1b14790d3fDhttp://resolver.tudelft.nl/uuid:aa536591fb4b4e489d13df1b14790d3f4Optical and thermal simulation chain for LED packageTapaninen, O.; Myohanen, P.; Majanen, M.; Sitomaniemi, A.; Olkkonen, J.; Hildenbrand, V.; Gielen, A.W.J.; Mackenzie, F.V.; Barink, M.; Smilauer, V.; Patzak, B.!This paper presents a test case for coupling two physical aspects of an LED, optical and thermal, using specific simulation models coupled through an open source platform for distributed multiphysics modelling. The glue code for coupling is written with Python programming language including routines to interface specific simulation models. This approach can also be used for any other software. The main optical simulations are performed with an open source ray tracer software and the mai<xn thermal simulations are performed with Comsol Multiphysics. We show how to connect a Mie theory based scattering calculator with the ray tracer. Simulation results are compared to measured samples. The total radiant power emitted by the modelled LED is shown to be up to 3% consistent with the measurements.Nano Technology; MAS  Materials Solutions; TS  Technical Sciences; Vision Electronics; Industrial Innovation; Computer programming; Microelectronics; Microsystems; Open source software; Open systems; Comsol multiphysics; Multiphysics modelling; Open source platforms; Open sources; Optical simulation; Physical aspects; Python programming language; Thermal simulations; Computer softwareconference paper6Institute of Electrical and Electronics Engineers Inc.)uuid:fda3fee6557c4cf6a768e2d28cb8bd7bDhttp://resolver.tudelft.nl/uuid:fda3fee6557c4cf6a768e2d28cb8bd7bVNumerical model of Ca(OH)<sub>2</sub> transport in concrete due to electrical currentsTKoster, T.; Peelen, W.; Larbi, J.; de Rooij, M.; Polder, R.; TNO Bouw en Ondergrond A mathematical model is being developed to describe a repair method in concrete, called cathodic protection (CP). The model is in principle also useful to describe electrodeposition in concrete, e.g. the process of reprecipitation of Ca(OH)<sub>2</sub> invoked by an electrical current. In CP, the current is sent from an external anode to the reinforcement inside the concrete. This model is implemented using the numerical software package Comsol Multiphysics. The model is based on the NernstPlanck equations and the electroneutrality condition considering the ionic species Na<sup>+</sup>, OH<sup></sup> and Ca<sup>2+</sup> and the solid Ca(OH)<sub>2</sub>. The mathematical model makes it possible to predict the location where Ca(OH)<sub>2</sub> precipitates when a certain current density is used. This could be of great use for controlled crack repair in concrete and for electrochemical realkalisation. This paper presents the qualitative behaviour of dissolution and reprecipitation of Ca(OH)<sub>2</sub> in CP. It discusses model calculations and preliminary experimental results. Experiments for a more complete validation of the model are in process. 2010 WILEYVCH Verlag GmbH & Co. KGaA.Building Engineering & Civil Engineering; SR  Structural Reliability; TS  Technical Sciences; Architecture; Crack repairs; Electrical current; Electroneutrality; Inprocess; Ionic species; Model calculations; Multiphysics; NernstPlanck equations; Numerical models; Numerical software; Reprecipitation; Repair methods; Calcium; Cathodic protection; Dissolution; Reinforcement; Sodium; Mathematical models)uuid:263ac76353e2443290459734a9483393Dhttp://resolver.tudelft.nl/uuid:263ac76353e2443290459734a9483393RThe electrothermalmechanical performance of an OLED: A multiphysics model studyYGielen, A.W.J.; Barink, M.; van de Brand, J.; van Mol, A.M.B.; TNO Industrie en Techniek In order to study the electricalthermomechanical interaction in OLEDs, finite element based simulation models were developed. Two dimensional models were used to study detailed design effects, such as the location of the bus bars, while a three dimensional model was used to study the effect of differences between the two and three dimensional models, as well as bus bar designs. 2009 IEEE.Electronics; Detailed design; Finite Element; Mechanical performance; Model study; Multiphysics; Simulation model; Thermomechanical; Threedimensional model; Two dimensional model; Microelectronics; Microsystems; Organic light emitting diodes (OLED); Three dimensional; Simulators
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