Curriculum Vitae

 Professional Experience

 Academic Self-Administration

 Education

 Awards

 Teaching

• Elaboration and implementation of lectures and tutorial courses for different advanced Bachelor's and advanced Master's courses, particularly
  • Introduction to Numerical Methods
  • Advanced Computational Material Modelling and Simulation II/Finite Inelasticity
  • Parameter Identification
  • Tensor Calculus
  • Strength of Materials 2 – Plasticity Theory
  • Nonlinear Optimization in Simulation Technology
• Tutorial courses (SS 2007–SS 2015) and lectures (WS 15/16 onwards)
  • WS 21/22: Technische Mechanik II (Engineering Mechanics II) & Introduction to Numerical Methods
  • SS 2021:   Mechanik II (Elastostatics) & Technische Mechanik I (Engineering Mechanics I)
  • WS 20/21: Non-Linear Finite Element Methods
  • SS 2020:   University of Bremen: Mechanik 1b (Elastostatics), TU Dortmund: Mechanik II (Elastostatics)
  • WS 19/20: University of Bremen: Mechanik 1a (Statics), Technische Mechanik 1 (Elastostatics) & Structural Mechanics in Lightweight Components
  • SS 2019:   University of Bremen: Mechanik 1b (Elastostatics), Technische Mechanik 2 (Dynamics) & Strength of Materials 2 – Plasticity Theory
  • WS 18/19: University of Bremen: Mechanik 1a (Statics), Technische Mechanik 1 (Elastostatics) & Structural Mechanics in Lightweight Components
  • SS 2018:   University of Bremen: Mechanik 1b (Elastostatics), Technische Mechanik 2 (Dynamics) & Nonlinear Optimization in Simulation Technology
  • WS 17/18: Finite Element Methods I
  • SS 2017:   Finite Element Methods II & Theory of Materials
  • WS 16/17: Finite Element Methods I
  • SS 2016:   Theory of Materials
  • WS 15/16: Introduction to Numerical Methods
  • SS 2015:   Tensor Calculus
  • WS 14/15: Introduction to Numerical Methods
  • SS 2013:   Parameter Identification
  • WS 12/13: Introduction to Numerical Methods
  • SS 2012:   Parameter Identification
  • WS 11/12: Introduction to Numerical Methods
  • SS 2011:   Advanced Computational Material Modelling and Simulation II/Finite Inelasticity
  • WS 10/11: Introduction to Numerical Methods
  • WS 09/10: Introduction to Numerical Methods
  • SS 2008:   Mechanik IV (Dynamics II)
  • WS 07/08: Mechanik III (Dynamics I)
  • SS 2007:   Mechanik IV (Dynamics II)
• (Co-)Supervision of student theses
  • Auslegung, messtechnische Erfassung und FE-Simulation eines Analogieversuchs zur Werkstückeinspannung beim Innenrundschälschleifen
    Bachelor thesis – completed 10/2021
    Author: N. Polinceusz
  • Remeshing of deformed bodies in large deformation FEM simulations using higher order elements
    Bachelor thesis – completed 05/2021
    Author: J. Stollberg
  • Analyse der dynamischen Eigenschaften eines Bugradfedersystems für ein Ultraleichtflugzeug
    Master project – completed 04/2021 (cooperation with ZARM Bremen)
    Authors: B. Ljatifi, A. Karahan
  • Solution recovery and transfer in h-adaptive finite element analyses
    Bachelor thesis – completed 04/2021
    Author: L. Sobisch
  • Distortions on selective laser melting components due to hot isostatic pressing (HIP): numerical and experimental approach
    Bachelor thesis – completed 12/2020 (cooperation with Materialise GmbH)
    Author: Y. Hachimi
  • Simulation of damage in ceramic matrix composites – an Abaqus UMAT implementation
    Bachelor thesis – completed 11/2020 (cooperation with Advanced Ceramics Bremen)
    Author: K. Cihan
  • Modelling and simulation of damage and crack propagation in engineering components
    Bachelor thesis – completed 10/2020
    Author: A. Kenfack
  • Parametric study for the determination of beam properties for a more accurate load distribution in FE-modelled multi-bolted connections
    Bachelor thesis – completed 10/2020 (cooperation with ArianeGroup SAS)
    Author: T. Hasak
  • Regelmäßige Neuvernetzung als Strategie für Finite-Element-Simulationen bei großen Verformungen in der Festkörpermechanik
    Bachelor thesis – completed 07/2020
    Author: P. Araghchi
  • Optimization and design of the shell structure of the student hybrid rocket ZEpHyR 2
    Bachelor thesis – completed 10/2019 (cooperation with ZARM Bremen)
    Author: J. Eisenmenger
  • Untersuchung von kritischen Beanspruchungen der Führungselemente eines Laufkrans mithilfe der FE-Methode
    Bachelor thesis – completed 09/2019 (cooperation with ArcelorMittal)
    Author: B. Ljatifi
  • Development of a calculation process to determine the external load on the GFEM Model of the flap structure of the A350XWB
    Bachelor thesis – completed 08/2019 (cooperation with Airbus)
    Author: G. Senkal
  • Development of finite element program modules for the simulation of extrusion processes
    Bachelor thesis – completed 08/2019
    Author: A. Borutta
  • Modeling of a Viscoelastic Polymer – Experiment, Finite Element Implementation and Parameter Identification
    Master thesis – completed 07/2019
    Author: M. Barghidarian
  • Simulation of plasticity using stress mode decompositions
    Bachelor thesis – completed 11/2018
    Author: M. Böddecker
  • Thermomechanische Ermüdung mit Modellvalidierung für die Lebensdauerberechnung eines Zylinderkopfes für einen Großdieselmotor
    Bachelor thesis – completed 10/2018 (cooperation with MAN SE)
    Author: J. Gerlach
  • Parameter identification for a visco-elastic polymer under large deformations
    Project thesis – completed 06/2018
    Author: M. Barghidarian
  • Automatisierte Abaqus-Parameterstudien für eine regularisierte Schädigungsformulierung
    Project thesis – completed 06/2018
    Author: A. Borutta
  • Simulation of shape memory alloys using stress mode dependent weighting functions
    Project thesis – completed 04/2018
    Author: M. Böddecker
  • Efficient numerical integration on the surface of a sphere
    Project thesis – completed 12/2017
    Author: H. Lammen
  • Optimierungsbasierte Kalibrierung eines visko-elastischen Materialmodells und Anwendung in der nichtlinearen FEM
    Bachelor thesis – completed 04/2017 (cooperation with KOSTAL GmbH & Co. KG)
    Author: S. Kimpel
  • Analysis of damage formulations for the finite element based simulation of forming processes
    Master thesis – completed 01/2017
    Author: A. Schowtjak
  • Implementation of a coupled model for the three-dimensional finite strain simulation of phase transformation and plasticity
    Project thesis – completed 09/2016
    Author: T. Keute
  • Implementation of hyperelastic finite strain micro-sphere models
    Bachelor thesis – completed 08/2016
    Author: H. Lammen
  • A contribution to the simulation of phase-transformations in grinding processes
    Project thesis – completed 05/2016
    Author: J. Grodotzki
  • A finite deformation thermo-elastic micro-sphere model for rubber-like materials
    Master thesis – completed 04/2016
    Author: P. Oppermann
  • Experiments and algorithmic treatment of material parameter identification utilizing optical displacement field measurements
    Master thesis – completed 02/2016
    Author: L. Rose
  • Zur Optimierung des Designs von Antriebstrommeln inklusive FKM-Dauerfestigkeitsnachweis
    Bachelor thesis – completed 11/2015 (cooperation with CAE Engineering und Service GmbH)
    Author: T. Keute
  • Fibre-Reinforced Composites – Finite Deformation Higher-Gradient Theory and Mixed Finite Element Formulation
    Master thesis – completed 10/2015
    Author: T. Asmanoglo
  • Optimization-based Parameter Identification for Inhomogeneous Problems
    Project thesis – completed 07/2015
    Author: L. Rose
  • Analyse von Effizienz und Stabilität verschiedener Zeitintegrationsverfahren zur Lösung von Differentialgleichungssystemen eines Festkörper-Phasentransformationsmodells
    Project thesis – completed 04/2015
    Author: S. Dohm
  • Calibration of Anisotropic Yield Surfaces Based on Kelvin Mode Decomposition
    Project thesis – completed 10/2013
    Author: T. Asmanoglo
  More details on open student thesis topics are provided here.

 Research

• Projects
  • since 01/2021: SFB-Transregio 188 (Collaborative Research Centre by the German Science Foundation), Senior Research Associate, TP S01: Model integration for process simulations
  • 01/2017 – 12/2020: SFB-Transregio 188 (Collaborative Research Centre by the German Science Foundation), Principal Investigator, TP S01: Model integration for process simulations
  • 07/2009 – 06/2015: SFB-Transregio 30 (Collaborative Research Centre by the German Science Foundation), TP B6: Modelling and simulation of thermo-mechanically induced phase transformations in steels
• Research Interests
  • Material modelling: thermodynamically consistent modelling of phenomena such as damage, plasticity, solid state phase transformations and temperature evolution in materials of technological interest within the geometrically nonlinear framework of generalised standard materials and beyond, including the embedding in FEA software
  • Multi-scale modeling/homogenisation: development of numerical frameworks for the microstructure simulation and homogenisation of high-resolution material models in the transition from nano/micro to meso/macro scale, e.g. by utilisation of the microsphere/microplane approach for the multi-scale modeling of anisotropic solids
  • Multi-field/coupled problems: formulation and efficient, monolithic numerical solution of multi-field problems, e.g. in the context of full thermomechanical coupling, gradient-enhanced damage formulations, or formally related problems
  • Inverse problems/optimisation: adaptation of methods of non-linear programming, including methods of different order in connection with active set and penalty strategies for constrained optimisation with application e.g. in the context of DIC-based parameter identification
  • Machine learning: adaptation of machine learning methods, specifically artificial neural networks, i.e. feedforward ANNs such as multilayer perceptrons and recurrent ANNs like LSTM, to problems in engineering mechanics, especially in the area of inverse problems
• Conference Organization
  • Organiser and Chair, 143rd Northern German Mechanics Colloquium, University of Bremen, February 2019
  • Chair of session Crystal Mechanics: 7th GACM Colloquium on Computational Mechanics, University of Stuttgart, October 2017
  • Chair of session Computational Materials Science: 3rd ECCOMAS Young Investigators Conference / 6th German Association for Computational Mechanics Colloquium (YIC/GACM), RWTH Aachen University, July 2015
• Laboratory Supervision
  • Walter+Bai combined tension/compression/torsion testing machine
  • GOM Aramis 3D optical deformation analysis system
  • InfraTec ImageIR thermal imaging system
  • Zeiss SteREO Discovery V20 digital microscope
  • Kammrath & Weiss micro-testing machine
  Details on the experimental equipment are provided here.
• Further Activities
  • Managing editor of GAMM-Mitteilungen – Surveys of the International Association of Applied Mathematics and Mechanics (since 01/2017)
  • Guest editor of the German Association for Computational Mechanics GACM Report No. 11 (summer 2019)
  • Reviewer for the ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS) Best Student Paper Competition (2015, 2016, 2017)
  • Reviewer for the Global Conference on Materials Science and Engineering CMSE (2018) and International Conference on Material Forming ESAFORM (2020)
  • Reviewer for Journal of the Mechanics and Physics of Solids (Elsevier), Mechanics of Materials (Elsevier), Journal of Manufacturing Processes (Elsevier), Production Engineering – Research and Development (Springer), Recent Patents and Topics on Imaging (Bentham Science), Materials Science and Engineering (IOP Conf. Series), and Procedia Manufacturing (Elsevier)
• Memberships
  • German Association for Computational Mechanics (GACM)
  • European Community on Computational Methods in Applied Sciences (ECCOMAS)
  • International Association for Computational Mechanics (IACM)
  • International Association of Applied Mathematics and Mechanics (GAMM)
  • Materials Chain – Key Research Initiative of the University Alliance Ruhr
  • German Association of University Professors and Lecturers (DHV)

 Publications

 Theses

 2015

• R. Ostwald
  Modelling and simulation of phase-transformations in elasto-plastic polycrystals,
  Dissertation, Institute of Mechanics, TU Dortmund, 2015

 2009

• R. Ostwald
  Fatigue assessment of welded steel structures based on harmonic analyses,
  Diploma Thesis, Siemens AG, 2009

 Journals

 2021

• A. Schowtjak, R. Schulte, T. Clausmeyer, R. Ostwald, A. E. Tekkaya, A. Menzel
  ADAPT – A Diversely Applicable Parameter Identification Tool: Overview and Full-Field Application Examples,
  International Journal of Mechanical Sciences, 213:106840 pp. 1–17 (DOI: 10.1016/j.ijmecsci.2021.106840), 2021

 2020

• R. Schulte, R. Ostwald, A. Menzel
  Gradient-enhanced modelling of damage for rate-dependent material behaviour – a parameter identification framework,
  Materials, 13(14):3156 pp. 1–20 (DOI: 10.3390/ma13143156), 2020

• T. Clausmeyer, A. Schowtjak, S. Wang, R. Gitschel, O. Hering, P. Pavliuchenko, J. Lohmar, R. Ostwald, G. Hirt, A. E. Tekkaya
  Prediction of Ductile Damage in the Process Chain of Caliber Rolling and Forward Rod Extrusion,
  Procedia Manufacturing, 47:649–655 (DOI: 10.1016/j.promfg.2020.04.201), 2020

• K. Langenfeld, A. Schowtjak, R. Schulte, O. Hering, K. Möhring, T. Clausmeyer, R. Ostwald, F. Walther, A. E. Tekkaya, J. Mosler
  Influence of anisotropic damage evolution on cold forging,
  Production Engineering, 14:115–121 (DOI: 10.1007/s11740-019-00942-y), 2020

• A. Schowtjak, S. Wang, O. Hering, T. Clausmeyer, J. Lohmar, R. Schulte, R. Ostwald, G. Hirt, A. E. Tekkaya
  Prediction and analysis of damage evolution during caliber rolling and subsequent cold forward extrusion,
  Production Engineering, 14:33–41 (DOI: 10.1007/s11740-019-00935-x), 2020

 2019

• R. Ostwald, E. Kuhl, A. Menzel
  On the implementation of finite deformation gradient-enhanced damage models,
  Computational Mechanics, 64(3):847–877 (DOI: 10.1007/s00466-019-01684-5), 2019

 2018

• R. Ostwald, T. Bartel, A. Menzel
  A finite strain continuum framework for the simulation of phase transformations based on representative transformation orientations,
  accepted for publication, 2018

 2016

• R. Ostwald, T. Bartel, A. Menzel
  A thermodynamically consistent finite strain micro-sphere framework for phase-transformations,
  Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Full Paper), pp. 2110–2122 (DOI: 10.7712/100016.1945.10899), 2016

 2015

• R. Ostwald, T. Bartel, A. Menzel
  An energy-barrier-based computational micro-sphere model for phase-transformations interacting with plasticity,
  Comput. Methods Appl. Mech. Engrg., 293:232–265 (DOI: 10.1016/j.cma.2015.04.008), 2015

 2014

• R. Ostwald, T. Bartel, A. Menzel
  A Gibbs-energy-barrier-based computational micro-sphere model for the simulation of martensitic phase-transformations,
  Int. J. Numer. Meth. Engng., 97:851–877 (DOI: 10.1002/nme.4601), 2014

• R. Ostwald, M. Tiffe, T. Bartel, A. Zabel, A. Menzel, D. Biermann
  Towards the multi-scale simulation of martensitic phase-transformations: an efficient post-processing approach applied to turning processes,
  Journal of Materials Processing Technology, 214(8):1516–1523 (DOI: 10.1016/j.jmatprotec.2014.02.022), 2014

 2013

• A. Menzel, T. Bartel, R. Ostwald
  Modelling and Simulation of Thermo-Mechanically Induced Phase-Transformations in Steel,
  In: Functionally Graded Materials in Industrial Mass Production, Volume 2, ISBN 978-3-942267-91-5, pp. 215–232, 2013

• T. Bartel, A. Bartels, U. Ehlenbröker, R. Mahnken, A. Menzel, J. Mosler, R. Ostwald, A. Schneidt, M. Wolff
  Modeling and Simulation of Solid Materials,
  In: Functionally Graded Materials in Industrial Mass Production – Fundamentals, ISBN 978-3-942267-92-2, pp. 113–128, 2013

 2012

• R. Ostwald, T. Bartel, A. Menzel
  Phase-transformations interacting with plasticity – a micro-sphere model applied to TRIP steel,
  Computational Materials Science, 64:12–16 (DOI: 10.1016/j.commatsci.2012.05.015), 2012

 2011

• R. Ostwald, T. Bartel, A. Menzel
  A one-dimensional computational model for the interaction of phase-transformations and plasticity,
  Int. J. of Structural Changes in Solids, 3(1):63–82, 2011

• D. Biermann, A. Menzel, T. Bartel, F. Höhne, R. Holtermann, R. Ostwald, B. Sieben, M. Tiffe, A. Zabel
  Experimental and computational investigation of machining processes for functionally graded materials,
  Procedia Engineering, 19:22–27 (DOI: 10.1016/j.proeng.2011.11.074), 2011

 2010

• R. Ostwald, T. Bartel, A. Menzel
  A computational micro-sphere model applied to the simulation of phase-transformations,
  J. Appl. Math. Mech., 90(7-8):605–622 (DOI: 10.1002/zamm.200900390), 2010

 2009

• A. Menzel, T. Bartel, R. Ostwald
  A crystallography-based model on the interaction of martensitic phase-transformations with plasticity,
  In: Functionally Graded Materials in Industrial Mass Production, ISBN 978-3-937524-91-7, pp. 251–266, 2009

• J. Unger, R. Ostwald, B. Svendsen
  Thermodynamic multifield modeling of electromagnetic metal forming,
  International Journal of Material Forming, 2:907–910 (DOI: 10.1007/s12289-009-0486-9), 2009

 Proceedings

 2021

• R. Schulte, R. Ostwald, A. Menzel
  A computational framework for gradient-enhanced damage – implementation and applications
  Proc. Appl. Math. Mech., 20(1):e202000215 pp. 1–3 (DOI: 10.1002/pamm.202000215), 2021

 2017

• R. Ostwald, T. Bartel, A. Menzel
  Modeling and simulation of phase transformations in polycrystals – a micro-sphere framework
  Proceedings of the 7th GACM Colloquium on Computational Mechanics, pp. 6–9 (DOI: 10.18419/opus-9334), 2017

 2016

• R. Ostwald, T. Bartel, A. Menzel
  Extending a finite strain hyperelastic micro-sphere framework towards phase transformations
  Proc. Appl. Math. Mech., 16(1):381–382 (DOI: 10.1002/pamm.201610179), 2016

 2015

• R. Ostwald, T. Bartel, A. Menzel
  A framework for the simulation of phase-transforming elasto-plastic SMA and TRIP steel polycrystals
  Proceedings of the 3rd Polish Congress of Mechanics/21st International Conference on Computer Methods in Mechanics (PCM/CMM), pp. 803–804 (ISBN: 978-83-932107-4-9), 2015

 2012

• R. Ostwald, T. Bartel, A. Menzel
  A multi-scale model for the interaction of phase-transformations and plasticity in polycrystalline solids
  Proceedings of the 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS), 2012

• R. Ostwald, T. Bartel, A. Menzel
  Simulation of phase-transformations based on numerical minimization of intersecting Gibbs energy potentials
  Proc. Appl. Math. Mech., 12(1):277–278 (DOI: 10.1002/pamm.201210129), 2012

• R. Ostwald, T. Bartel, A. Menzel, M. Tiffe, D. Biermann, M. Lebsanft, B. Scholtes
  Modelling and Simulation of Phase-Transformations and Plasticity in Steel
  Proceedings of the 1st International Conference on Thermo-Mechanically Graded Materials, pp. 109–114 (ISBN: 978-3-942267-58-8), 2012

 2011

• R. Ostwald, T. Bartel, A. Menzel
  Interaction of phase-transformations and plasticity – a multi-phase micro-sphere approach
  Proc. Appl. Math. Mech., 11(1):417–418 (DOI: 10.1002/pamm.201110200), 2011

 2010

• R. Ostwald, T. Bartel, A. Menzel
  A micro-sphere approach applied to the modelling of phase-transformations
  Proc. Appl. Math. Mech., 10(1):315–316 (DOI: 10.1002/pamm.201010150), 2010

• R. Ostwald, T. Bartel, A. Menzel
  A micro-sphere approach applied to the simulation of phase transformations interacting with plasticity
  Proceedings of the 23rd Nordic Seminar on Computational Mechanics (NSCM-23), pp. 157–160 (ISRN: KTH/MEK/TR--10/07--SE), 2010

 Talks

 2021

• Schädigungsmodellierung und -simulation – vom Mikromodell zur Bauteil-Leistungsfähigkeit
  3. Sitzung des Industriekreises des SFB/TRR 188, Meschede (online), 2021

• A gradient-enhanced damage modelling framework for metal forming simulations – application and calibration
  European Structural Integrity Society (ESIS) Technical Meeting on Numerical Methods (TC8), University of Belgrade, Serbia (online), 2021

 2020

• Zur mikromechanisch motivierten Modellierung und Simulation komplexer CMC-Bauteile
  CU-Thementag Ceramic Composites / Arbeitskreis Verstärkung keramischer Werkstoffe (DKG/DGM), Augsburg (online), 2020

• Aspects of implementation of regularised continuum damage for complex FE analyses
  European Structural Integrity Society (ESIS) Technical Meeting on Numerical Methods (TC8), University of Munich UniBwM, Neubiberg, Germany, 2020

 2019

• Kombination von regularisierter duktiler Schädigung und Plastizität für die Simulation von Umformprozessen
  143rd Northern German Mechanics Colloquium (143. Norddeutsches Mechanik-Kolloquium), University of Bremen, Germany, 2019

 2018

• Towards the simulation of complex metal forming processes: combination of regularised damage and contact
  Vierte Sitzung der Arbeitsgruppe Simulation des Arbeitskreises Bruchmechanik und Bauteilsicherheit des Deutschen Verbandes für Materialforschung und -prüfung e.V. (DVM), Institute of Forming Technology and Lightweight Components (IUL), TU Dortmund, Germany, 2018

• A computational framework for the simulation of regularised damage
  Materials Science and Engineering (MSE) Congress, Darmstadt University of Technology, Germany, 2018

• Implementation of a gradient-enhanced damage model – a heat equation-based framework
  6th European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) – ECCM 6, Glasgow, Scotland, UK, 2018

 2017

• Modelling and Simulation of phase transformations in elasto-plastic polycrystals
  Invited Plenary Talk, 7th GACM Colloquium on Computational Mechanics, University of Stuttgart, Germany, 2017

• A regularised damage formulation for the application in commercial finite element codes
  Invited Talk, E. Kuhl Seminar, Stanford University, CA, USA, Apr 2017

• Modelling and computation of deformation-induced anisotropy in metal alloys
  Invited Talk, E. Kuhl Seminar, Stanford University, CA, USA, Feb 2017

 2016

• Modellierung und Simulation anisotroper Festkörper
  Invited Talk, Rudolf Chaudoire Pavillon, TU Dortmund University, Germany, 2016

• A thermodynamically consistent finite strain micro-sphere framework for phase-transformations
  7th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), Crete Island, Greece, 2016

• Extending a finite strain hyperelastic micro-sphere framework towards phase transformations
  Joint Annual Meeting of GAMM and DMV, TU Braunschweig, Germany, 2016

 2015

• Modelling and Simulation of temperature-dependent phase-transformations in elasto-plastic SMA polycrystals
  3rd Spring School on Simulation-Based Microstructure Design (SiMiDe), Hamminkeln, Germany, 2015

• A micro-mechanically motivated finite deformation thermo-elastoplastic framework for martensitic phase-transformations
  3rd ECCOMAS Young Investigators Conference / 6th German Association for Computational Mechanics Colloquium (YIC/GACM), Aachen, Germany, 2015

• Modellierung und Simulation thermo-mechanisch induzierter Phasentransformationen in Stahlwerkstoffen
  SFB/Transregio 30 Abschlusskolloquium, Gießhaus, University of Kassel, Germany, 2015

• A framework for the simulation of phase-transforming elasto-plastic SMA and TRIP steel polycrystals
  3rd Polish Congress of Mechanics/21st International Conference on Computer Methods in Mechanics (PCM/CMM), Gdansk, Poland, 2015

 2014

• A finite deformation framework for phase-transformations interacting with plasticity and its robust numerical solution
  IWCMM24 – XXIV International Workshop on Computational Micromechanics of Materials, IMDEA Materials Institute, Madrid, Spain, 2014

 2013

• Simulation of temperature-dependent phase-transformations and plasticity in polycrystalline metals based on Gibbs energy barriers
  Invited Talk, University of Zaragoza, Spain, 2013

• A micromechanically motivated material model for polycrystalline SMA
  International Workshop on New Trends in Solid Mechanics: Coupled Fields and Multi-scale Modelling, Castro Urdiales, Spain, 2013

• Simulation of plasticity and martensitic phase-transformations based on representative transformation directions
  XII International Conference on Computational Plasticity (COMPLAS XII), Barcelona, Spain, 2013

• Efficient Assessment of In-Process Phase-Transformations – Application to Machining Processes
  6. Forum Metallplastizität / 26. Workshop Composite Forschung in der Mechanik, Liborianum Paderborn, Germany, 2013

 2012

• Experimental and computational investigation of machining processes for functionally graded materials
  1st CIRP Conference on Surface Integrity (CSI), Bremen, Germany, 2012

• Simulation of phase-transformations based on numerical minimization of intersecting Gibbs energy potentials
  83rd GAMM Annual Meeting, Darmstadt University of Technology, Germany, 2012

• Modelling and Simulation of phase-transformations in polycrystalline materials with application to machining processes
  19. Sitzung der TRR30 AG Eigenschaftscharakterisierung, Institut für spanende Fertigung (ISF), TU Dortmund, Germany, 2012

• A multi-scale model for the interaction of phase-transformations and plasticity in polycrystalline solids
  6th European Congress on Computational Methods in applied Sciences and Engineering (ECCOMAS Congress 2012), University of Vienna, Austria, 2012

• Zerspanung von gradierten Flanschwellen
  2. Sitzung des Industriebeirates des SFB/Transregio 30, Lehrstuhl für Werkstofftechnik (LWT), TU Dortmund, Germany, 2012

• Modelling and Simulation of Phase-Transformations and Plasticity in Steel
  1st International Conference on Thermo-Mechanically Graded Materials, Kongress Palais Kassel, Germany, 2012

 2011

• A multi-phase micro-sphere-based model for phase-transformations interacting with plastic deformations
  10th GAMM-Seminar on Microstructures, Darmstadt University of Technology, Germany, 2011

• Interaction of phase-transformations and plasticity – a multi-phase micro-sphere approach
  82nd GAMM Annual Meeting, Grazer Congress, Graz, Austria, 2011

• Computational modelling of phase-transformations interacting with plasticity – combination of a Gibbs-energy-barrier-based transformation criterion with a plastic inheritance approach
  21st International Workshop on Computational Mechanics of Materials, University of Limerick, Ireland, 2011

• Mikromechanisch motivierte Modellierung und Simulation der temperaturabhängigen Interaktionen zwischen Phasentransformationen und Plastizität
  5. Forum Metallplastizität / 24. Workshop Composite Forschung in der Mechanik, Liborianum Paderborn, Germany, 2011

 2010

• A micro-sphere approach applied to the modelling of phase-transformations
  81st GAMM Annual Meeting, KIT Karlsruhe Institute of Technology, Karlsruhe, Germany, 2010

• Zur Modellierung und Simulation thermomechanisch induzierter Phasentransformationen in Stahlwerkstoffen
  1st TRR30 Workshop on Modeling and Simulation, TU Dortmund, Germany, 2010

• A micro-sphere approach applied to the simulation of phase transformations interacting with plasticity
  23rd Nordic Seminar on Computational Mechanics (NSCM-23), KTH Royal Institute of Technology, Stockholm, Sweden, 2010

 2009

• Fatigue assessment of welded steel structures based on harmonic analyses
  Siemens AG, Mülheim/Ruhr, Germany, 2009

 2008

• Modeling and simulation of electromagnetic forming processes: a combination of ANSYS and FEAP
  Institute of Mechanics, TU Dortmund, Germany, 2008

 2007

• Development of finite element program modules for the simulation of electromagnetic forming
  Institute of Mechanics, TU Dortmund, Germany, 2007

 Poster

 2020

• R. Schulte, R. Ostwald, T. Kaiser, A. Menzel
  Machine learning for parameter identification and model reduction of gradient-enhanced damage models for metal forming processes,
  GAMM Juniors' Summer School on Applied Mathematics and Mechanics ("Learning Models from Data: Model Reduction, System Identification and Machine Learning"), Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, 2020

• A. Schowtjak, R. Schulte, T. Clausmeyer, R. Ostwald
  Model integration for process simulations,
  2nd SFB/Transregio 188 Industrial Colloquium, RWTH Aachen University, 2020

 2018

• R. Ostwald, L. Sprave, R. Schulte, A. Menzel
  A gradient-enhanced damage implementation for the simulation of damage in metal forming processes,
  2nd Materials Chain International Conference (MCIC), Ruhr University Bochum, 2018

• A. Schowtjak, T. Clausmeyer, R. Ostwald
  Modellintegration für die Prozesssimulation,
  SFB/Transregio 188 Industriekolloquium, Congress Center Westfalenhallen Dortmund, 2018

• R. Ostwald, E. Kuhl, A. Menzel
  A computational framework for the simulation of regularised damage,
  Materials Science and Engineering (MSE) Congress, Darmstadt University of Technology, 2018

 2016

• T. Clausmeyer, R. Ostwald
  Wissenschaftliches Serviceprojekt: Modellintegration für die Prozesssimulation – Zielsetzung,
  SFB/Transregio 188 Project Application, Institute of Forming Technology and Lightweight Components (IUL), TU Dortmund University, 2016

• T. Clausmeyer, R. Ostwald
  Wissenschaftliches Serviceprojekt: Modellintegration für die Prozesssimulation – Arbeitsplan,
  SFB/Transregio 188 Project Application, Institute of Forming Technology and Lightweight Components (IUL), TU Dortmund University, 2016

• T. Clausmeyer, R. Ostwald
  Wissenschaftliches Serviceprojekt: Modellintegration für die Prozesssimulation – Vorarbeiten,
  SFB/Transregio 188 Project Application, Institute of Forming Technology and Lightweight Components (IUL), TU Dortmund University, 2016

 2015

• R. Ostwald, T. Bartel., A. Menzel
  Modelling and simulation of phase-transformations in elasto-plastic SMA and TRIP steel polycrystals,
  3rd Spring School on Simulation-Based Microstructure Design (SiMiDe), Akademie Klausenhof, Hamminkeln, 2015

• R. Ostwald, T. Bartel, B. Kiefer, A. Menzel
  Modelling and Simulation,
  Materials Chain Kick-off meeting, Ruhr University Bochum, 2015

 2014

• R. Ostwald, T. Bartel, A. Menzel
  Modellierung und Simulation thermo-mechanisch induzierter Phasentransformationen in Stahlwerkstoffen – Antragsposter,
  SFB/Transregio 30, 2nd Interim Evaluation, Paderborn University, 2014

• R. Ostwald, T. Bartel, A. Menzel
  Modellierung und Simulation thermo-mechanisch induzierter Phasentransformationen in Stahlwerkstoffen – Berichtsposter,
  SFB/Transregio 30, 2nd Interim Evaluation, Paderborn University, 2014

 2012

• R. Ostwald, T. Bartel, A. Menzel, M. Tiffe, D. Biermann, M. Lebsanft, B. Scholtes
  Modelling and simulation of the interactions between phase-transformations and plasticity in steel,
  11th GAMM-Seminar on Microstructures, Essen, SFB/Transregio 30 Cluster Poster – Research Projects A3/B6/D2, 2012

• D. Biermann, A. Menzel, T. Bartel, F. Höhne, R. Holtermann, R. Ostwald, B. Sieben, M. Tiffe, A. Zabel
  Experimental and computational investigation of machining processes for functionally graded materials,
  1st CIRP Conference on Surface Integrity (CSI), Bremen, SFB/Transregio 30 Cooperation Poster – Research Projects A3/B6, 2012

 2010

• R. Ostwald, T. Bartel, A. Menzel
  Modellierung und Simulation thermo-mechanisch induzierter Phasentransformationen in Stahlwerkstoffen (I),
  SFB/Transregio 30, 1st Interim Evaluation, Institute of Machining Technology (ISF), TU Dortmund, 2010

• R. Ostwald, T. Bartel, A. Menzel
  Modellierung und Simulation thermo-mechanisch induzierter Phasentransformationen in Stahlwerkstoffen (II),
  SFB/Transregio 30, 1st Interim Evaluation, Institute of Machining Technology (ISF), TU Dortmund, 2010