TY - CHAP
A1 - Häfner, Stefan
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - A geometrical inclusion-matrix model for the finite element analysis of concrete at multiple scales
N2 - This paper introduces a method to generate adequate inclusion-matrix geometries of concrete in two and three dimensions, which are independent of any specific numerical discretization. The article starts with an analysis on shapes of natural aggregates and discusses corresponding mathematical realizations. As a first prototype a two-dimensional generation of a mesoscale model is introduced. Particle size distribution functions are analysed and prepared for simulating an adequate three-dimensional representation of the aggregates within a concrete structure. A sample geometry of a three-dimensional test cube is generated and the finite element analysis of its heterogeneous geometry by a uniform mesh is presented. Concluding, aspects of a multiscale analysis are discussed and possible enhancements are proposed.
KW - Beton
KW - Dreidimensionales Modell
KW - Finite-Elemente-Methode
Y1 - 2003
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3018
ER -
TY - JOUR
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - Adaptive damage simulation of concrete using heterogeneous multiscale models
JF - Journal of Algorithms & Computational Technology
N2 - Adaptive damage simulation of concrete using heterogeneous multiscale models
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2008
SP - 275
EP - 297
ER -
TY - CHAP
A1 - Eckardt, Stefan
A1 - Könke, Carsten
ED - Gürlebeck, Klaus
ED - Könke, Carsten
T1 - ADAPTIVE SIMULATION OF THE DAMAGE BEHAVIOR OF CONCRETE USING HETEROGENEOUS MULTISCALE MODELS
N2 - In this paper an adaptive heterogeneous multiscale model, which couples two substructures with different length scales into one numerical model is introduced for the simulation of damage in concrete. In the presented approach the initiation, propagation and coalescence of microcracks is simulated using a mesoscale model, which explicitly represents the heterogeneous material structure of concrete. The mesoscale model is restricted to the damaged parts of the structure, whereas the undamaged regions are simulated on the macroscale. As a result an adaptive enlargement of the mesoscale model during the simulation is necessary. In the first part of the paper the generation of the heterogeneous mesoscopic structure of concrete, the finite element discretization of the mesoscale model, the applied isotropic damage model and the cohesive zone model are briefly introduced. Furthermore the mesoscale simulation of a uniaxial tension test of a concrete prism is presented and own obtained numerical results are compared to experimental results. The second part is focused on the adaptive heterogeneous multiscale approach. Indicators for the model adaptation and for the coupling between the different numerical models will be introduced. The transfer from the macroscale to the mesoscale and the adaptive enlargement of the mesoscale substructure will be presented in detail. A nonlinear simulation of a realistic structure using an adaptive heterogeneous multiscale model is presented at the end of the paper to show the applicability of the proposed approach to large-scale structures.
KW - Architektur
KW - CAD
KW - Computerunterstütztes Verfahren
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170327-29478
UR - http://euklid.bauing.uni-weimar.de/ikm2006/index.php_lang=de&what=papers.html
ER -
TY - CHAP
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - Coupling techniques for heterogeneous multiscale models of concrete
N2 - Coupling techniques for heterogeneous multiscale models of concrete
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2007
ER -
TY - CHAP
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - Damage simulation of concrete on the mesoscale
N2 - Damage simulation of concrete on the mesoscale
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2005
ER -
TY - CHAP
A1 - Eckardt, Stefan
A1 - Könke, Carsten
ED - Gürlebeck, Klaus
ED - Könke, Carsten
T1 - ENERGY RELEASE CONTROL FOR NONLINEAR MESOSCALE SIMULATIONS
N2 - In nonlinear simulations the loading is, in general, applied in an incremental way. Path-following algorithms are used to trace the equilibrium path during the failure process. Standard displacement controlled solution strategies fail if snap-back phenomena occur. In this contribution, a path-following algorithm based on the dissipation of the inelastic energy is presented which allows for the simulation of snap-backs. Since the constraint is defined in terms of the internal energy, the algorithm is not restricted to continuum damage models. Furthermore, no a priori knowledge about the final damage distribution is required. The performance of the proposed algorithm is illustrated using nonlinear mesoscale simulations.
KW - Angewandte Informatik
KW - Angewandte Mathematik
KW - Architektur
KW - Computerunterstütztes Verfahren
KW - Computer Science Models in Engineering; Multiscale and Multiphysical Models; Scientific Computing
Y1 - 2010
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170314-28414
UR - http://euklid.bauing.uni-weimar.de/ikm2009/paper.html
SN - 1611-4086
ER -
TY - JOUR
A1 - Häfner, Stefan
A1 - Eckardt, Stefan
A1 - Luther, Torsten
A1 - Könke, Carsten
T1 - Mesoscale modeling of concrete: Geometry and numerics
JF - Computers and Structures
N2 - Mesoscale modeling of concrete: Geometry and numerics
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2006
SP - 450
EP - 461
ER -
TY - JOUR
A1 - Unger, Jörg F.
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - Modelling of cohesive crack growth in concrete structures with the extended finite element method
JF - Computer Methods in Applied Mechanics and Engineering
N2 - Modelling of cohesive crack growth in concrete structures with the extended finite element method
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2007
SP - 4087
EP - 4100
ER -
TY - JOUR
A1 - Könke, Carsten
A1 - Eckardt, Stefan
A1 - Häfner, Stefan
A1 - Luther, Torsten
A1 - Unger, Jörg F.
T1 - Multiscale simulation methods in damage prediction of brittle and ductile materials
JF - International Journal for Multiscale Computational Engineering
N2 - Multiscale simulation methods in damage prediction of brittle and ductile materials
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2010
SP - 17
EP - 36
ER -
TY - CHAP
A1 - Unger, Jörg F.
A1 - Eckardt, Stefan
A1 - Könke, Carsten
T1 - Numerical Models for the simulation of concrete on the mesoscale
N2 - Numerical Models for the simulation of concrete on the mesoscale
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2005
ER -
TY - JOUR
A1 - Bruhin, R.
A1 - Stock, U.A.
A1 - Drücker, J.-P.
A1 - Azhari, T.
A1 - Wippermann, J.
A1 - Albes, J.M.
A1 - Hintze, D.
A1 - Eckardt, Stefan
A1 - Könke, Carsten
A1 - Wahlers, T.
T1 - Numerical simulation techniques to study the structural response of the human chest following median sternotomy
JF - The Annals of Thoracic Surgery
N2 - Numerical simulation techniques to study the structural response of the human chest following median sternotomy
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2005
SP - 623
EP - 630
ER -
TY - CHAP
A1 - Könke, Carsten
A1 - Eckardt, Stefan
A1 - Häfner, Stefan
A1 - Luther, Torsten
A1 - Unger, Jörg F.
T1 - Schädigungs- und Verbundmodellierung für Stahlbetontragwerke
N2 - Schädigungs- und Verbundmodellierung für Stahlbetontragwerke
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2005
ER -
TY - CHAP
A1 - Eckardt, Stefan
A1 - Häfner, Stefan
A1 - Könke, Carsten
T1 - Simulation of the fracture behaviour of concrete using continuum damage models at the mesoscale
N2 - Simulation of the fracture behaviour of concrete using continuum damage models at the mesoscale
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2004
ER -
TY - CHAP
A1 - Könke, Carsten
A1 - Eckardt, Stefan
A1 - Häfner, Stefan
T1 - Spatial and temporal multiscale simulations of damage processes for concrete
N2 - Spatial and temporal multiscale simulations of damage processes for concrete
KW - Angewandte Mathematik
KW - Strukturmechanik
Y1 - 2006
ER -