"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:516151b0-9829-493f-b03a-1dd8927c914f","http://resolver.tudelft.nl/uuid:516151b0-9829-493f-b03a-1dd8927c914f","A level set model for stress dependent corrosion pit propagation","Dekker, R.; van der Meer, F.P.; Maljaars, J.; Sluys, L.J.","","2021","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.","Pitting corrosion; Corrosion fatigue; Level set method; Multi-physics; Buildings and Infrastructures; 2015 Urbanisation","en","article","","","","","","","","","","","","","",""
"uuid:c83982ae-e139-4d6a-b02e-e7a0b0f138af","http://resolver.tudelft.nl/uuid:c83982ae-e139-4d6a-b02e-e7a0b0f138af","Prediction of the deformed geometry of vat photo-polymerized components using a multi-physical modeling framework","Westbeek, S.; Remmers, J.J.C.; van Dommelen, J.A.W.; Maalderink, H.H.; Geers, M.G.D.","","2021","In photopolymerization-based additive manufacturing a complex interplay exists between the vat photopolymerization process characteristics and the (photo-active) 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 test-print. The current work proposes an alternative modeling-driven 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 multi-physical modeling of irradiation, photopolymerization, solidification and chemical shrinkage.","Additive manufacturing; Vat photopolymerization; Digital light processing; Multi-physical modeling; Process simulation; Validation study; Mechanical analysis","","article","Elsevier","","","","","","","","","","","","",""
"uuid:aa536591-fb4b-4e48-9d13-df1b14790d3f","http://resolver.tudelft.nl/uuid:aa536591-fb4b-4e48-9d13-df1b14790d3f","Optical and thermal simulation chain for LED package","Tapaninen, O.; Myohanen, P.; Majanen, M.; Sitomaniemi, A.; Olkkonen, J.; Hildenbrand, V.; Gielen, A.W.J.; Mackenzie, F.V.; Barink, M.; Smilauer, V.; Patzak, B.","","2016","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 multi-physics 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 main 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; Multi-physics modelling; Open source platforms; Open sources; Optical simulation; Physical aspects; Python programming language; Thermal simulations; Computer software","en","conference paper","Institute of Electrical and Electronics Engineers Inc.","9781509021062","","","","","","","","","","","",""
"uuid:fda3fee6-557c-4cf6-a768-e2d28cb8bd7b","http://resolver.tudelft.nl/uuid:fda3fee6-557c-4cf6-a768-e2d28cb8bd7b","Numerical model of Ca(OH)_{2} transport in concrete due to electrical currents","Koster, T.; Peelen, W.; Larbi, J.; de Rooij, M.; Polder, R.; TNO Bouw en Ondergrond ","","2010","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 re-precipitation of Ca(OH)_{2} 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 Nernst-Planck equations and the electroneutrality condition considering the ionic species Na^{+}, OH^{-} and Ca^{2+} and the solid Ca(OH)_{2}. The mathematical model makes it possible to predict the location where Ca(OH)_{2} precipitates when a certain current density is used. This could be of great use for controlled crack repair in concrete and for electrochemical re-alkalisation. This paper presents the qualitative behaviour of dissolution and re-precipitation of Ca(OH)_{2} in CP. It discusses model calculations and preliminary experimental results. Experiments for a more complete validation of the model are in process. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.","Building Engineering & Civil Engineering; SR - Structural Reliability; TS - Technical Sciences; Architecture; Crack repairs; Electrical current; Electroneutrality; In-process; Ionic species; Model calculations; Multi-physics; Nernst-Planck equations; Numerical models; Numerical software; Re-precipitation; Repair methods; Calcium; Cathodic protection; Dissolution; Reinforcement; Sodium; Mathematical models","en","article","","","","","","","","","","","","","",""
"uuid:263ac763-53e2-4432-9045-9734a9483393","http://resolver.tudelft.nl/uuid:263ac763-53e2-4432-9045-9734a9483393","The electro-thermal-mechanical performance of an OLED: A multi-physics model study","Gielen, A.W.J.; Barink, M.; van de Brand, J.; van Mol, A.M.B.; TNO Industrie en Techniek ","","2009","In order to study the electrical-thermo-mechanical 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; Multi-physics; Simulation model; Thermo-mechanical; Three-dimensional model; Two dimensional model; Microelectronics; Microsystems; Organic light emitting diodes (OLED); Three dimensional; Simulators","en","conference paper","","9781424441617","","","","","","","","","","","",""