PUMA publications for /tag/function,Tue Nov 05 17:39:35 CET 2024Computational Materials Science2391-402Discrete element representation of continua: Proof of concept and determination of the material parameters502010Airy Continuum Discrete Element Fracture, Framework Lattice Material Method, Spring function, isd myown stress A common approach for the modelling of metal or microfibre reinforced materials is to see these materials as a continuum on the macro scale. A major drawback is that an equation based on the continuum theory is unable to predict the various complicated microscopic effects, even though those effects have a strong influence on the macroscopic behaviour, e.g. on fracture, fatigue and life time. A large number of attempts has been made to correct the shortcomings of the continuum-based theories. One interesting alternative to common approaches for the numerical modelling of discontinuous materials is the Discrete Element Method (DEM). Within the DEM, the individual particles are modelled as stiff (or rigid) bodies which interact via contact forces. This simplification has the advantage of the complicated microscopic behaviour being represented by a simple system of linear equations based on a relatively small number of parameters. This paper describes the requirement for new computational methods for the modelling of fracture mechanics. First of all a proof of the described method will be shown. Then two examples are presented in order to verify the Discrete Element Method. Furthermore it will be shown how the corresponding material parameters are gained and implemented and how the boundary conditions have to be modelled in order to achieve exact results for the stress and strain fields of 2D shells.Mon Nov 27 15:10:57 CET 2023Fassadentechnik620--25Hülle mit vielen {Aufgaben} - {Textilfassade}232017(Planer), Anforderung, Aussichtsplattform, Baden-Württemberg, Baugrundeigenschaft, Befestigungselement, Belastungssimulation, Besonderheit, Betonkonstruktion, Betonplatte, Bundesrepublik, Dauerfestigkeit, Deutschland, Erdbebensimulation, Fassadengestaltung, Fassadenverkleidung, Flächengebilde, Funktion, Gebäudehülle, Glasfasergewebe, Krafteinleitung, Nachweis, Pendel, Planungsanforderung, Rottweil(11), Schwerlastanker, Schwingungsdämpfung, Schwingungserregung, Sobek, Stahlbetonturm, Temperaturspannung, Testanlage, Textiles Tragwerksbemessung, Turmbauwerk, Werner Windbelastung, Witterungsschutz anchor, application, area-measured building capacity, concrete damping, design, dimensioning earthquake endurance, facade facing, fastener, feature, force function, glass-fiber ground heavy-load impulse, installation, load loading material, of oscillatory pendulum, planning platform, proof, property, protection, reinforced requirement, shape, simulation, slab, sobek special stress, structure, structures, temperature test textile tissue, tower tower, vibration viewing weathering wind Er überragt alle Gebäude in Baden-Württemberg und bietet Deutschlands höchste Aussichtsplattform - der Aufzugstest-Turm der ThyssenKrupp Elevator AG im schwäbischen Rottweil. Um den Betonkörper "schraubt" sich eine 17.000 qm große Hülle aus polymerbeschichtetem Glasfasergewebe. Zur Verankerung dieser Membran kommen Schwerlastbefestigungen zum Einsatz.Mon Nov 27 15:10:57 CET 20232019 {IEEE} {International} {Conference} on {Automation} {Science} and {Engineering} ({CASE}), {August} 22-26, 2019, {Vancouver}1263--1268Homogenizability of element utilization in adaptive structures2019actuators, buildings, controllability, cost function, mathematical model, sobek stress, topology A major part of the world's resource consumption, waste production and green house gas emissions is due to the construction sector. Ultra-light weight structures can be very resource efficient, but do require active elements to withstand all occurring loads. In order to use the full potential of these so-called adaptive structures, all elements should ideally be uniformly utilized for load transfer. This goal is often referred to as stress homogenization. However, we propose to instead homogenize element utilization, where the element stress is additionally weighted by the maximum allowed stress for every single element. In this paper, we present a method to quantify an adaptive structure's ability to homogenize the element utilization, for which we introduce the homogenizability Gramian and an appropriate output equation. We will place actuators for optimal homogenization of given disturbances using a greedy algorithm. Simulations are conducted for homogenization of the element utilization under an exemplary wind load for a two-dimensional truss structure. The obtained results indicate significant potential for the reduction of element stresses and nodal displacements, though the latter is not explicitly demanded.Fri Jul 20 10:54:26 CEST 2018ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift f{\"u}r Angewandte Mathematik und Mechanikn/a--n/aOn the singular limit of a two-phase flow equation with heterogeneities and dynamic capillary pressure2013Conservation capillarity, discontinuous dynamic flow flux from:mhartmann function, ians in law, limit, media. porous singular two-phase vorlaeufig We consider conservation laws with spatially discontinuous flux that are perturbed by diffusion and dispersion terms. These equations arise in a theory of two-phase flow in porous media that includes rate-dependent (dynamic) capillary pressure and spatial heterogeneities. We investigate the singular limit as the diffusion and dispersion parameters tend to zero, showing strong convergence towards a weak solution of the limit conservation law.Fri Jul 20 10:54:15 CEST 2018ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift f{\"u}r Angewandte Mathematik und Mechanikn/a--n/aOn the singular limit of a two-phase flow equation with heterogeneities and dynamic capillary pressure2013Conservation capillarity, discontinuous dynamic flow flux function, in law, limit, media. porous singular two-phase vorlaeufig We consider conservation laws with spatially discontinuous flux that are perturbed by diffusion and dispersion terms. These equations arise in a theory of two-phase flow in porous media that includes rate-dependent (dynamic) capillary pressure and spatial heterogeneities. We investigate the singular limit as the diffusion and dispersion parameters tend to zero, showing strong convergence towards a weak solution of the limit conservation law.function,Community for tag(s) function,