Prof. Dr.-Ing. Stefan Löhnert

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Institut für Mechanik und Flächentragwerke

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TU Dresden, Fakultät Bauingenieurwesen, Ebene 3, Zi. 03-017 August-Bebel-Straße 30

01219 Dresden

Deutschland

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Forschung

Numerische Methoden in der Bruchmechanik (XFEM)
Mehrskalenmethoden
Materialmodellierung
Mehrfeldprobleme
Homogenisierungsmethoden für mikroheterogene Materialien bei großen Deformationen
Finite Elemente Technologie

... zu den Forschungsprojekten

Werdegang

seit 09/2019	Professor für Baumechanik und Direktor des Instituts für Mechanik und Flächentragwerke, Technische Universität Dresden
10/2017- 08/2019	Lehrstuhlvertretung am Institut für Mechanik und Flächentragwerke, Technische Universität Dresden
2008-2017	Oberingenieur am Institut für Kontinuumsmechanik, Leibniz Universität Hannover
2007-2008	Oberingenieur am Institut für Baumechanik und Numerische Mechanik, Leibniz Universität Hannover
2005-2007	Post-doctoral fellow an der Northwestern University, Evanston, Illinois, USA
10/2004	Promotion zum Dr.-Ing. an der Leibniz Universität Hannover, Titel: "Computational Homogenization of Microheterogeneous Materials at Finite Strains Including Damage"
1999-2005	Wissenschaftlicher Mitarbeiter am Institut für Baumechanik und Numerische Mechanik, Leibniz Universität Hannover
1998-1999	Integriertes Auslandsstudium an der University of California, Berkeley
1996-1999	Studium der Mechanik an der Technischen Universität Darmstadt, Thema der Diplomarbeit: "Ein Verfahren zur adaptiven Schrittweitensteuerung in der finiten Viskoelastizitätstheorie"
1994-1996	Studium des Maschinenbaus an der Technischen Universität Darmstadt

Publikationen

an der TU Dresden entstanden (seit 2018)
Zeitschriftenartikel, Promotionen und Buchbeiträge, seit 2018
Konferenzbeiträge, seit 2018

an anderen Institutionen entstanden (bis 2018)
Zeitschriftenartikel, Promotionen und Buchbeiträge, bis 2018
Konferenzbeiträge, bis 2018

Zeitschriftenartikel, Promotionen, Bücher / Buchbeiträge
seit 2018

Bei der Kommunikation mit dem FIS ist ein Fehler aufgetreten.

bis 2018

[44]	M. Pezeshki, S. Löhnert, P. Wriggers, P.A. Guidault, E. Baranger: 3D dynamic crack propagation by the extended finite element method and a gradient-enhanced damage model In: J. Soric, P. Wriggers, O. Allix (Editors) Multiscale Modeling of Heterogeneous Structures. pp. 277-299, Springer Verlag, 2018
[43]	S. Beese, S. Löhnert, P. Wriggers: 3D ductile crack propagation within a polycrystalline microstructure using XFEM. Computational Mechanics, DOI: 10.1007/s00466-017-1427-y, 2017.
[42]	S. Beese, S. Löhnert, P. Wriggers: Non-Local Ductile Damege Formulations for Sheet Bulk Metal Forming. Journal of Physics: Conference Series, 734, 032059.
[41]	S. Beese, S. Löhnert, P. Wriggers: Modeling of Fracture in Polycrystalline Materials. SEMA SIMAI Advances in Discretization Methods, 12:79–102, 2016.
[40]	] T. Steiner, P. Wriggers, S. Löhnert: A discontinuous Galerkin Finite Element Method for linear elasticity using a mixed integration scheme to circumvent shear-locking. Proceedings in Applied Mathematics and Mechanics, 16:769–770, 2016.
[39]	S. Löhnert, S. Beese: A regularization technique for the XFEM: extension to finite deformations, inelastic material behaviour and multifield problems. Proceedings in Applied Mathematics and Mechanics ,16:153–154, 2016.
[38]	S. Beese, S. Löhnert, P. Wriggers: 3D Ductile crack propagation with the XFEM. Proceedings in Applied Mathematics and Mechanics, 15:747–748, 2015.
[37]	S. Zeller, S. Löhnert, P. Wriggers: Modelling thermoplastic material behaviour of dual-phase steels on a microscopic length scale. Proceedings in Applied Mathematics and Mechanics, 15:373–374, 2015.
[36]	S. Löhnert: Stabilizing the XFEM for static and dynamic crack simulations. Proceedings in Applied Mathematics and Mechanics, 15:137–138, 2015.
[35]	S. Löhnert: A stabilization technique for the regularization of nearly singular extended finite elements. Computational Mechanics, 54:523–533, 2014.
[34]	M. Holl, T. Rogge, S. Löhnert, P. Wriggers, R. Rolfes: 3D multiscale crack propagation using the XFEM applied to a gas turbine blade. Computational Mechanics, 53:173–188, 2014.
[33]	E. Lehmann, D. Fassmann, S. Löhnert, M. Schaper, P. Wriggers: Texture development and formability prediction for pre-textured cold rolled body-centered cubic steel. International Journal of Engineering Science, 68:24–37, 2013.
[32]	M. Holl, S. Löhnert, P. Wriggers: An adaptive multiscale method for crack propagation and crack coalescence. Int. J. Numer. Meth. Engng., 93:23–51, 2013.
[31]	E. Lehmann, S. Löhnert, P. Wriggers: About the Microstructural Effects of Polycrystalline Materials and their Macroscopic Representation at Finite Deformation. Proceedings in Applied Mathematics and Mechanics, 12:275–276, 2012.
[30]	S. Löhnert, C. Prange, P. Wriggers: Error Controlled Adaptive Multiscale XFEM Simulation of Cracks. Int. J. Frac., 178:147–156, 2012.
[29]	E. Lehmann, S. Löhnert, P. Wriggers: Computational Homogenisation of Polycrystalline Elastoplastic Microstructures at Finite Deformation. Technische Mechanik, 32:369–379, 2012.
[28]	D.S. Müller-Höppe, P. Wriggers, S. Löhnert: Crack face contact for a hexahedral-based XFEM formulation. Computational Mechanics, 49:725–734, 2012.
[27]	C. Prange, S. Löhnert, P. Wriggers: Error estimation for crack simulations using the XFEM, Int. J. Numer. Meth. Engng., 91:1459–1474, 2012.
[26]	N. Hajibeik, I. Temizer, S. Löhnert, P. Wriggers: Adaptive Multi-scale Modeling Error Estimation for Composites. Proceedings in Applied Mathematics and Mechanics, 11:525–526, 2011.
[25]	E. Lehmann, S. Löhnert, P. Wriggers: Computational Homogenisation of Polycrystalline Elastoplastic Microstructures at Finite Deformation. Proceedings in Applied Mathematics and Mechanics, 11:401–402, 2011.
[24]	S. Löhnert, D.S. Müller-Höppe, P. Wriggers: 3D corrected XFEM approach and extension to finite deformation theory. Int. J. Numer. Meth. Engng., 86:431–452, 2011.
[23]	S. Löhnert, D.S. Müller-Höppe: 3D multiscale projection method for micro- / macrocrack interaction simulations. In: D.S. Müller-Höppe, S. Löhnert, S. Reese (Editors) Recent Developments and Innovative Applications in Computational Mechanics. pp. 223-230, Springer Verlag, 2011
[22]	L. Krstulovic-Opara, S. Löhnert, D.S. Müller-Höppe, M. Vesenjak: Multiscale modeling of metal foams using the XFEM. In: D.S. Müller-Höppe, S. Löhnert, S. Reese (Editors) Recent Developments and Innovative Applications in Computational Mechanics. pp. 215-222, Springer Verlag, 2011
[21]	D.S. Müller-Höppe, S. Löhnert: A brick element for finite deformations with inhomogeneous mode enhancement. In: D.S. Müller-Höppe, S. Löhnert, S. Reese (Editors) Recent Developments and Innovative Applications in Computational Mechanics. pp. 69-76, Springer Verlag, 2011
[20]	E.F.I. Börner, D.S. Müller-Höppe, S. Löhnert: A Finite Element formulation based on the theory of a Cosserat point - Modification of the torsional modes. In: D.S. Müller-Höppe, S. Löhnert, S. Reese (Editors) Recent Developments and Innovative Applications in Computational Mechanics. pp. 61-68, Springer Verlag, 2011
[19]	D.S. Müller-Höppe, S. Löhnert, S. Reese: Recent Developments and Innovative Applications in Computational Mechanics, Springer Verlag, 2011
[18]	C. Weber, S. Löhnert, P. Wriggers: Aspects of the Facet-Edge Data Structure for the Construction of Voronoi Cells. Proceedings in Applied Mathematics and Mechanics, 10:645–646, 2010.
[17]	E. Lehmann, S. Löhnert, P. Wriggers: Modelling Metals at Finite Deformation. Proceedings in Applied Mathematics and Mechanics, 10:305–306, 2010.
[16]	S. Löhnert, L. Krstulovic-Opara, M. Vesenjak, D.S. Müller-Höppe: Homogenization principle based multi-scale modeling of cellular structures. Journal of the Serbian Society for Computational Mechanics, 4:97–109, 2010.
[15]	P. Wriggers, D.S. Müller-Höppe, S. Löhnert: Brick elements for finite deformations based on macro-concepts and on inhomogeneous mode enhancement. Computational Methods in Applied Sciences, 14:33–48, 2009.
[14]	D.S. Müller-Höppe, S. Löhnert, P. Wriggers: A finite deformation brick element with inhomogeneous mode enhancement. Int. J. Numer. Meth. Engng., 78:1164–1187, 2009.
[13]	S. Löehnert, D.S. Müller-Höppe: Multiscale Methods for Fracturing Solids. GACM Report:30–34, 2008.
[12]	T. Belytschko, S. Löhnert, J.H. Song: Multiscale Aggregating Discontinuities: A Method for Circumventing Loss of Material Stability. Int. J. Numer. Meth. Engng., 73:869–894, 2008.
[11]	S. Löhnert, P. Wriggers: Effective Behaviour of Elastic Heterogeneous Thin Structures at Finite Deformations. Computational Mechanics, 41:595–606, 2008.
[10]	S. Löhnert, D.S. Müller-Höppe: Multiscale methods for fracturing solids. In: B.D. Reddy (Editors) IUTAM Bookseries vol. 11, pp. 79-87, Springer, 2008
[9]	S. Löhnert, T. Belytschko: Crack shielding and amplification due to multiple microcracks interacting with a macrocrack. International Journal of Fracture, 145:1–8, 2007.
[8]	S. Löhnert, T. Belytschko: A Multiscale Projection Method for Macro/Microcrack Simulations. Int. J. Numer. Meth. Engng., 71:1466–1482, 2007.
[7]	E. Börner, S. Löhnert, P. Wriggers: A new finite element based on the theory of a Cosserat point - extension to initially distorted elements for 2D plane strain. Int. J. Numer. Meth. Engng., 71:454–472, 2007.
[6]	S. Löhnert, P. Wriggers: Aspects of Computational Homogenization of Microheterogeneous Materials including Decohesion at Finite Strains. Proceedings in Applied Mathematics and Mechanics, 5:427–428, 2005.
[5]	T. Raible, K. Tegeler, S. Löhnert, P. Wriggers: Development of wrinkling algorithm for orthotropic membrane materials. Comput. Methods Appl. Mech. Engrg., 194:2550–2568, 2005.
[4]	S. Löhnert, E.F.I. Börner, M.B. Rubin, P. Wriggers: Response of a nonlinear elastic general cosserat brick element in simulations typically exhibiting locking and hourglassing. Computational Mechanics, 36: 255 – 265, 2005.
[3]	S. Löhnert, P. Wriggers: Homogenization of microheterogeneous materials considering interfacial delamination at finite strains. Technische Mechanik, 23:167-177, 2003
[2]	P. Wriggers, U. Nackenhorst, S. Beuermann, H. Spiess, S. Löhnert: Technische Mechanik Kompakt. Teubner Verlag, 2005
[1]	S. Löhnert: Computational Homogenization of Microheterogeneous Materials at Finite Strains Including Damage. Dissertation, Institut für Baumechanik und Numerische Mechanik, Leibniz Universität Hannover, 2005

Konferenzbeiträge (Auswahl)
seit 2018

Bei der Kommunikation mit dem FIS ist ein Fehler aufgetreten.

bis 2018

[33]	S. Löhnert, S. Beese: Stabilised XFEM for the 3D simulation of crack propagation within the polycrystalline microstructure of dual phase steels during forming processes. ECCOMAS Thematic Conference X-DMS 2017 – eXtended Discretization Methods for partial differential equations on complex and evolving domains, 2017
[32]	S. Löhnert, S. Beese: Stabilised XFEM for the 3D simulation of crack propagation within the polycrystalline microstructure of dual phase steels during forming processes. ECCOMAS Thematic Conference X-DMS 2017 – eXtended Discretization Methods for partial differential equations on complex and evolving domains, 2017
[31]	S. Löhnert: Stabilizing the XFEM: Extension to finite deformations, inelastic material behaviour, material instabilities and multifield problems. ECCOMAS 2016: European Congress on Computational Methods in Applied Sciences and Engineering, 2016
[30]	S. Löhnert: Stabilizing the XFEM: Extension to finite deformations, inelastic material behaviour, material instabilities and multifield problems. ECCOMAS 2016: European Congress on Computational Methods in Applied Sciences and Engineering, 2016
[29]	S. Löhnert, S. Zeller, P. Wriggers: Modelling the thermo-mechanical behaviour of the polycrystalline microstructure of dual phase steels during sheet bulk metal forming. keynote lecture, ICM 12: 12th International Conference on the Mechanical Behavior of Materials, 2015
[28]	S. Löhnert, M. Holl, C. Prange: 3D error controlled adaptive XFEM simulation of ductile fracture on multiple scales. Proceedings 11th WCCM , 2014
[27]	M. Holl, S. Loehnert, P. Wriggers, M. Nicolaus: Three-dimensional crack propagation in ductile media using the XFEM. keynote lecture, ECCOMAS Thematic Conference CFRAC 2013: International Conference on Computational Modeling of Fracture and Failure of Materials and Structures, 2013
[26]	S. Löhnert: A stabilization technique for the extended finite element simulation of arbitrary crack geometries in 3D. ECCOMAS Thematic Conference CFRAC 2013: International Conference on Computational Modeling of Fracture and Failure of Materials and Structures, 2013
[25]	S. Löhnert: A stabilization technique for the regularization of nearly singular extended finite elements. XFEM, GFEM and fictitious domain methods, 2013
[24]	E. Lehmann, S. Löhnert, P. Wriggers: Computational homogenisation of polycrystalline elastoplastic microstructures at finite deformation. ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers, pp. 6213-6228, 2012
[23]	S. Löhnert, C. Prange, P. Wriggers: Combined Model and Discretization Adaptivity within 3D Multiscale XFEM Simulations of Cracks. Proceedings 10th WCCM, 2012
[22]	E. Lehmann, S. Schmaltz, S. Germain, D. Faßmann, C. Weber, S. Löhnert, M. Schaper, Fr.W. Bach, P. Steinmann, K. Willner, P. Wriggers: Material model identification for DC04 based on the numerical modelling of the polycrystalline microstructure and experimental data. Key Engineering Materials, 504-506: 993-998, 2012
[21]	S. Löhnert, D. Müller-Höppe, C. Hoppe, M. Holl: Multiscale Modelling of Fracture. Oberwolfach Report No. 9/2012, DOI: 10.4171/OWR/2012/9
[20]	E. Lehmann, S. Löhnert, P. Wriggers: Towards the effective behaviour of polycrystalline microstructures at finite strains. Proceedings Computational Plasticity XI - Fundamentals and Applications, COMPLAS XI, pp. 1573-1583, 2011
[19]	E. Lehmann, S. Löhnert, P. Wriggers: Towards the effective behaviour of polycrystalline materials for sheet bulk metal forming processes. AIP Conf. Proc., pp. 1179–1184, 2011
[18]	P. Wriggers, S. Löhnert, M. Hain: Materialmodellierung im Bauingenieurwesen. Tagungsband zum 15. Dresdner Baustatik-Seminar “Materialmodelle und Tragwerksplanung” pp. 5-18, 2011
[17]	E. Lehmann, S. Schmaltz, D. Faßmann, S. Germain, C. Weber, S. Löhnert, M. Schaper, Fr.-W. Bach, P. Steinmann, K. Willner, P. Wriggers: Identifikation eines Materialmodells für den DC04 basierend auf der numerischen Modellierung der polykristallinen Mikrostruktur und experimentellen Daten. Tagungsband zum Industriekolloquium Blechmassivumformung, pp. 13-32, 2011
[16]	S. Löhnert, C. Hoppe, M. Holl: Error controlled adaptive multiscale XFEM computation of cracks. ECCOMAS Special Interest Conference: Trends & Challenges in Computational Mechanics, 2011
[15]	S. Löhnert, M. Holl: Crack Propagation and Coalescence in an Adaptive Multiscale Framework. Semi-Plenary Lecture ECCOMAS Thematic Conference XFEM 2011: The Extended Finite Element Method, 2011
[14]	S. Löhnert, C. Hoppe, P. Wriggers: Error Controlled Adaptive Multiscale XFEM Computation of Cracks. Keynote Lecture ECCOMAS Thematic Conference CFRAC 2011: International Conference on Computational Modeling of Fracture and Failure of Materials and Structures, 2011
[13]	S. Löhnert, D.S. Mueller-Hoeppe: Adaptive Multiscale Modelling of Microcrack / Macrocrack Interaction and Propagation Using the XFEM. 81st Annual Meeting of the International Association of Applied Mathematics and Mechanics, 2010
[12]	P. Wriggers, S. Löhnert: Characterization of concrete by a multiscale approach. International Rilem Conference on Material Science (MATSCI), RILEM Proceedings, vol. 76, pp. 3-12, 2010
[11]	S. Löhnert, D.S. Mueller-Hoeppe, P. Wriggers: Efficient microcrack / macrocrack interaction and propagation analysis using an adaptive multiscale technique. Proceedings IV European Conference on Computational Mechanics, 2010
[10]	S. Löhnert, D.S. Mueller-Hoeppe, P. Wriggers: Efficient microcrack / macrocrack analysis using an adaptive multiscale technique. Proceedings 9th World Congress on Computational Mechanics, 2010
[9]	S. Löhnert: Adaptive multiscale analysis of microcrack / macrocrack interaction and propagation. Plenary Lecture ECCOMAS Thematic Conference XFEM 2009: The Extended Finite Element Method, 2009
[8]	S. Löhnert, D.S. Mueller-Hoeppe, P. Wriggers: A Multiscale Projection Method for Fracturing Solids in Three Dimensions. Proceedings of the XXII International Congress on Theoretical an Applied Mechanics, 2008
[7]	S. Löhnert, D.S. Mueller-Hoeppe, P. Wriggers: A Multiscale Projection Method for Fracturing Solids. Proceedings 8th World Congress on Computational Mechanics, 2008
[6]	S. Löhnert, D.S. Mueller-Hoeppe: Multiscale Methods for Fracturing Solids. Proceedings IUTAM Symposium on Theoretical, Modelling and Computational Aspects of Inelastic Media, 2008
[5]	S. Löhnert, T. Belytschko: A Multiscale Method for Crack Simulations. Proceedings 7th World Congress on Computational Mechanics, 2006
[4]	P. Wriggers, S. Löhnert, M. Hain: Characterization of materials with microheterogeneous structure. Computational Plasticity: Fundamentals and Applications - Proceedings of the 8th International Conference on Computational Plasticity, COMPLAS VIII, pp. 39-42, 2005
[3]	S. Löhnert, P. Wriggers: Aspects of Computational Homogenization of Microheterogeneous Materials including Decohesion at Finite Strains. Proceedings of the VIII. U.S. National Congress on Computational Mechanics, Austin, Texas 2005
[2]	S. Löhnert, K. Tegeler, P. Wriggers, T. Raible: A simple wrinkling algorithm for orthotropic membranes at finite deformations. Proceedings Textile Composites and inflatable Structures, Structural Membranes, 2003
[1]	S. Löhnert, P. Wriggers: Homogenization of considering interfacial delamination at finite strains. Conference on Computational Plasticity COMPLAS, microheterogeneous materials, Proceedings VII International, 2003

Prof. Dr.-Ing. Stefan Löhnert

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