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Dr.-Ing. Ulrich Hoppe

  • Wissenschaftlicher Mitarbeiter
  • Lehrstuhl für Allgemeine Mechanik
  • Institut für Computational Engineering
  • Fakultät für Bau- und Umwelt-
    ingenieurwissenschaften
  • Raum IA 3/133
  • Fon +49 (0)234 /32-26027
  • Fax +49 (0)234 /32-06027
  • E-Mail: Ulrich.Hoppe@rub.de

Lehre

  • Einführung in die Mechanik für den Studiengang Sales Engineering und Product Management [bis WS 2007/08]
  • Mechanik für den Studiengang Angewandte Informatik [bis WS 2007/08]
  • Computational Plasticity für das Master's Programme Computational Engineering
  • Symbolisches Rechnen I, II als Wahlfach für den Maschinenbau und das Bauingenieurwesen
  • Kontinuumsmechanik I, IIIa für die Studiengänge Maschinenbau und Bauingenieurwesen [bis WS 2009/10]
  • Höhere Festigkeitslehre für die Bachelor/Master-Studiengänge Maschinenbau und Bauingenieurwesen [ab WS 2009/10]
  • Koordination des Fachlabors Mechanik für die Studiengänge Maschinenbau und Bauingenieurwesen [seit WS 2008/09]

Forschung

  • Berechnung von Mikrostrukturen durch numerische Relaxierung
  • Modellierung von Rissausbreitung in Schalen
  • Sonderforschungsbereich 398
    Lebensdauerorientierte Entwurfskonzepte unter Schädigungs- und Deteriorationsaspekten
    Mitarbeit im Teilprojekt B8 Mehrskalensimulation von Schädigungsprozessen
  • Sonderforschungsbereich 459 Formgedächtnistechnik
    Mitantragsteller im Teilprojekt A9 Mikromechanische Modellierung von Formgedächtnismaterialien
  • Sonderforschungsbereich 526 Rheologie der Erde - von der Oberkruste bis in die Subduktionszone
    Mitarbeit bei dem Teilprojekt Teilprojekt B7 Rheological response of continental crust to thermal pulses related to magmatism and volcanism

Verwaltung

  • Netzbetreuer, Hard- und Software des Lehrstuhls
  • Schriftenreihe des Instituts für Mechanik
  • Internetseiten (LAM und Institut für Mechanik)
  • Koordination der Kolloquiumsreihe Mechanik Bochum-Dortmund

Kurzer Lebenslauf

1982
Abitur
1982-1985
Ausbildung zum Maschinenschlosser bei der TURMAG, Sprockhövel (Turbomaschinen)
1985-1986
Wehrdienst
1986-1991
Maschinenbaustudium an der Ruhr-Universität Bochum
1991-1996
Doktorand am Lehrstuhl für Mechanik II von Prof. Stumpf
seit 1996
Wissenschaftlicher Mitarbeiter am Lehrstuhl für Allgemeine Mechanik
 

Publikationen

Heinen, R.; Hoppe, U.; Hackl, K.
Prediction of microstructural patterns in monocrystalline shape memory alloys using global energy minimization,
Materials Science and Engineering A, Vol. 481(Sp. Iss. SI), pp. 362-365, (2008).

[Abstract] [BibTeX] [DOI]
Abstract: A frequent observation in materials showing martensitic phase transformations is the formation of twins. Considering monocrystalline shape memory alloys, analytical results are known stating which martensitic variants are capable of forming an unstrained interface with each other. Based on these results, an estimate of the elastic energy of the material is formulated. By global optimization, microstructural parameters such as the orientation and the composition of the martensitic twins are determined.
BibTeX: 
@article{Heinen2008,
  author = {Heinen, Rainer and Hoppe, Ulrich and Hackl, Klaus},
  title = {Prediction of microstructural patterns in monocrystalline shape memory alloys using global energy minimization},
  journal = {Materials Science and Engineering A},
  year = {2008},
  volume = {481},
  number = {Sp. Iss. SI},
  pages = {362-365},
  doi = {http://dx.doi.org/10.1016/j.msea.2006.11.175}
}
Bartels, S.; Carstensen, C.; Conti, S.; Hackl, K.; Hoppe, U.; Orlando, A.
Relaxation and the computation of effective energies and microstructures in solid mechanics,
In Analysis, modeling and simulation of multiscale problems, Berlin, Heidelberg , pp. 197-224, Springer, (2006).

[Abstract] [BibTeX] [DOI]
Abstract: We address the numerical analysis of relaxed formulations for scalar and vectorial nonconvex variational problems originating from models for solid-solid phase transitions and crystal plasticity.We discuss algorithms for the approximation of the quasiconvex envelope using laminates, rank-one convexity, and polyconvexity, and present some numerical applications to benchmarks problems, and to a model for single-slip crystal plasticity.
BibTeX: 
@incollection{Bartels2006,
  author = {Bartels, Sören and Carstensen, Carsten and Conti, Sergio and Hackl, Klaus and Hoppe, Ulrich and Orlando, Antonio},
  title = {Relaxation and the computation of effective energies and microstructures in solid mechanics},
  booktitle = {Analysis, modeling and simulation of multiscale problems},
  publisher = {Springer},
  year = {2006},
  pages = {197--224},
  doi = {http://dx.doi.org/10.1007/3-540-35657-6}
}
Carstensen, C.; Hackl, K.; Hoppe, U.; Orlando, A.
Computational microstructures in phase transition solids and finite-strain elastoplasticity,
GAMM-Mitteilungen, Vol. 29(2), pp. 215-246, (2006).

[BibTeX]
BibTeX: 
@article{Carstensen2006,
  author = {Carstensen, Carsten and Hackl, Klaus and Hoppe, Ulrich and Orlando, Antonio},
  title = {Computational microstructures in phase transition solids and finite-strain elastoplasticity},
  journal = {GAMM-Mitteilungen},
  year = {2006},
  volume = {29},
  number = {2},
  pages = {215--246}
}
Hackl, K.; Zhang, W.; Hoppe, U.
Micromechanical modelling of the behaviour of polycrystalline shape-memory-alloys,
Smst-2004: Proceedings of the International Conference on $, (2006).

[BibTeX] [URL]
BibTeX: 
@article{Hackl2006b,
  author = {Hackl, Klaus and Zhang, Wenge and Hoppe, Ulrich},
  title = {Micromechanical modelling of the behaviour of polycrystalline shape-memory-alloys},
  journal = {Smst-2004: Proceedings of the International Conference on $},
  year = {2006},
  url = {http://books.google.com/books?hl=en&lr=&id=4gwHOc9X4GoC&oi=fnd&pg=PA151&dq=k+hackl&ots=k3BBBnaPJw&sig=th-pRf2Y8YZk22-yutZuN0HTX44}
}
Hackl, K.; Zhang, W.; Hoppe, U.
Micromechanical modelling of the influence of precipitates in shape memory alloys,
Smst-2004: Proceedings of the International Conference on $, (2006).

[BibTeX] [URL]
BibTeX: 
@article{Hackl2006c,
  author = {Hackl, Klaus and Zhang, Wenge and Hoppe, Ulrich},
  title = {Micromechanical modelling of the influence of precipitates in shape memory alloys},
  journal = {Smst-2004: Proceedings of the International Conference on $},
  year = {2006},
  url = {http://books.google.com/books?hl=en&lr=&id=4gwHOc9X4GoC&oi=fnd&pg=PA137&dq=k+hackl&ots=k3BBBnaPJw&sig=4KSsFpaujuo08k3UfA5awBKKRsc}
}
Hoppe, U.
Numerical simulation of crack propagation in shells,
In Shell Structures: Theory and Applications, , pp. 467-473, Taylor&Francis Group, London, (2006).

[BibTeX]
BibTeX: 
@inproceedings{Hoppe2006,
  author = {Hoppe, Ulrich},
  title = {Numerical simulation of crack propagation in shells},
  booktitle = {Shell Structures: Theory and Applications},
  publisher = {Taylor&Francis Group, London},
  year = {2006},
  pages = {467-473}
}
Hoppe, U.; Hackl, K.; Peters, M.
Computing crack propagation by the extended finite element method,
Oberwolfach Report, (5), pp. 278-281, (2005).

[BibTeX]
BibTeX: 
@article{Hoppe2005,
  author = {Hoppe, Ulrich and Hackl, Klaus and Peters, Markus},
  title = {Computing crack propagation by the extended finite element method},
  journal = {Oberwolfach Report},
  year = {2005},
  number = {5},
  pages = {278-281}
}
Bartels, S.; Carstensen, C.; Hackl, K.; Hoppe, U.
Effective relaxation for microstructure simulations: algorithms and applications,
Computer Methods in Applied Mechanics and Engineering, Vol. 193(48-51), pp. 5143-5175, (2004).

[Abstract] [BibTeX] [DOI]
Abstract: For a wide class of problems in continuum mechanics like those involving phase transitions or finite elastoplasticity, the governing potentials tend to be not quasiconvex. This leads to the occurrence of microstructures of in principle arbitrarily small scale, which cannot be resolved by standard discretization schemes. Their effective macroscopic properties, however, can efficiently be recovered with relaxation theory.

The paper introduces the variational framework necessary for the implementation of relaxation algorithms with emphasis on problems with internal variables in a time-incremental setting. The methods developed are based on numerical approximations to notions of generalized convexification. The focus is on the thorough analysis of numerical algorithms and their efficiency in applications to benchmark problems. An outlook to time-evolution of microstructures within the framework of relaxation theory concludes the paper.
BibTeX: 
@article{Bartels2004,
  author = {Bartels, Sören and Carstensen, Carsten and Hackl, Klaus and Hoppe, Ulrich},
  title = {Effective relaxation for microstructure simulations: algorithms and applications},
  journal = {Computer Methods in Applied Mechanics and Engineering},
  year = {2004},
  volume = {193},
  number = {48-51},
  pages = {5143-5175},
  doi = {http://dx.doi.org/10.1016/j.cma.2003.12.065}
}
Hackl, K.; Hoppe, U.
Adaptive wavelet-algorithms for inelastic shells,
In THEORIES OF PLATES AND SHELLS: CRITICAL REVIEW AND NEW APPLICATIONS, Vol. 16, pp. 53-60, (2004).

[BibTeX]
BibTeX: 
@inproceedings{Hackl2004,
  author = {Hackl, Klaus and Hoppe, Ulrich},
  title = {Adaptive wavelet-algorithms for inelastic shells},
  booktitle = {THEORIES OF PLATES AND SHELLS: CRITICAL REVIEW AND NEW APPLICATIONS},
  year = {2004},
  volume = {16},
  pages = {53-60}
}
Hackl, K.; Zhang, W.; Schmidt-Baldassari, M.; Hoppe, U.
Micromechanics of tension-compression asymmetry of polycrystalline shape-memory-alloys,
Materialwissenschaft und Werkstofftechnik, Vol. 35(5), pp. 284-288, (2004).

[BibTeX] [URL]
BibTeX: 
@article{Hackl2004d,
  author = {Hackl, Klaus and Zhang, Wenge and Schmidt-Baldassari, Martin and Hoppe, Ulrich},
  title = {Micromechanics of tension-compression asymmetry of polycrystalline shape-memory-alloys},
  journal = {Materialwissenschaft und Werkstofftechnik},
  year = {2004},
  volume = {35},
  number = {5},
  pages = {284-288},
  url = {http://www3.interscience.wiley.com/journal/108561625/abstract}
}
Hoppe, U.; Hackl, K.
Numerical Simulation of Microstructures via Higher-Order Rank-One Relaxation,
Proceedings in Applied Mathematics and Mechanics (PAMM), Vol. 4, pp. 221-222, (2004).

[BibTeX]
BibTeX: 
@article{Hoppe2004,
  author = {Hoppe, Ulrich and Hackl, Klaus},
  title = {Numerical Simulation of Microstructures via Higher-Order Rank-One Relaxation},
  journal = {Proceedings in Applied Mathematics and Mechanics (PAMM)},
  year = {2004},
  volume = {4},
  pages = {221-222}
}
Peters, M.; Hoppe, U.; Hackl, K.
Simulation of crack propagation using embedded discontinuities,
In Second Int. Conference Lifetime-Oriented Design Concepts, , pp. 141-147, (2004).

[BibTeX]
BibTeX: 
@inproceedings{Peters2004,
  author = {Peters, Markus and Hoppe, Ulrich and Hackl, Klaus},
  title = {Simulation of crack propagation using embedded discontinuities},
  booktitle = {Second Int. Conference Lifetime-Oriented Design Concepts},
  year = {2004},
  pages = {141-147}
}
Zhang, W.; Hackl, K.; Hoppe, U.
Micromechanical Modelling of the Constitutive Behaviour of NiTi Shape Memory Alloys,
Proceedings in Applied Mathematics and Mechanics (PAMM), Vol. 4 (1), pp. 272-273), (2004).

[BibTeX]
BibTeX: 
@article{Zhang2004,
  author = {Zhang, Wenge and Hackl, Klaus and Hoppe, Ulrich},
  title = {Micromechanical Modelling of the Constitutive Behaviour of NiTi Shape Memory Alloys},
  journal = {Proceedings in Applied Mathematics and Mechanics (PAMM)},
  year = {2004},
  volume = {4 (1)},
  pages = {272-273)}
}
Hackl, K.; Hoppe, U.
On the calculation of microstructures for inelastic materials using relaxed energies,
IUTAM Symposium on Computational Mechanics of Solid $,,
In IUTAM Symposium on Computational Mechanics of Solid Materials at Large Strains: proceedings of the IUTAM symposium held in Stuttgart, Germany, 20-24 August 2001, Vol. 108, pp. 77-86, Kluwer Academic Pub, (2003).

[BibTeX] [URL]
BibTeX: 
@incollection{Hackl2003,
  author = {Hackl, Klaus and Hoppe, Ulrich},
  title = {On the calculation of microstructures for inelastic materials using relaxed energies},
  booktitle = {IUTAM Symposium on Computational Mechanics of Solid Materials at Large Strains: proceedings of the IUTAM symposium held in Stuttgart, Germany, 20-24 August 2001},
  journal = {IUTAM Symposium on Computational Mechanics of Solid $},
  publisher = {Kluwer Academic Pub},
  year = {2003},
  volume = {108},
  pages = {77-86},
  url = {http://books.google.com/books?id=rZgSRTmOMuoC}
}
Hoppe, U.; Hackl, K.
Numerische Berechnung von Mikrostrukturen bei inelastischen Materialien mittels relaxierter Energien,
Proceedings in Applied Mathematics and Mechanics (PAMM), (2003).

[BibTeX] [URL]
BibTeX: 
@article{Hoppe2003,
  author = {Hoppe, Ulrich and Hackl, Klaus},
  title = {Numerische Berechnung von Mikrostrukturen bei inelastischen Materialien mittels relaxierter Energien},
  journal = {Proceedings in Applied Mathematics and Mechanics (PAMM)},
  year = {2003},
  url = {http://www3.interscience.wiley.com/journal/104086089/abstract}
}
Hoppe, U.; Hackl, K.
Numerical Simulation of Microstructures Based on Incremental Variational Formulations and Relaxation Methods,
Proceedings in Applied Mathematics and Mechanics (PAMM), Vol. 3, pp. 284-285, (2003).

[BibTeX]
BibTeX: 
@article{Hoppe2003a,
  author = {Hoppe, Ulrich and Hackl, Klaus},
  title = {Numerical Simulation of Microstructures Based on Incremental Variational Formulations and Relaxation Methods},
  journal = {Proceedings in Applied Mathematics and Mechanics (PAMM)},
  year = {2003},
  volume = {3},
  pages = {284-285}
}
Hoppe, U.; Hackl, K.
Numerical relaxation of nonconvex functionals in elastoplasticity,
Proceedings in Applied Mathematics and Mechanics (PAMM), (2002).

[BibTeX] [URL]
BibTeX: 
@article{Hoppe2002,
  author = {Hoppe, Ulrich and Hackl, Klaus},
  title = {Numerical relaxation of nonconvex functionals in elastoplasticity},
  journal = {Proceedings in Applied Mathematics and Mechanics (PAMM)},
  year = {2002},
  url = {http://www3.interscience.wiley.com/journal/92012793/abstract}
}
Stumpf, H.; Hoppe, U.
The application of tensor algebra on manifolds to nonlinear continuum mechanics - Invited survey article,
Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM), Vol. 77, pp. 327-339, (1997).

[BibTeX]
BibTeX: 
@article{Stumpf1997,
  author = {Stumpf, Helmut and Hoppe, Ulrich},
  title = {The application of tensor algebra on manifolds to nonlinear continuum mechanics - Invited survey article},
  journal = {Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM)},
  year = {1997},
  volume = {77},
  pages = {327-339}
}
Makowski, J.; Hoppe, U.; Stumpf, H.
On intrinsic geometry of continua with microstructure,
Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM), Vol. 73, pp. T337-T339, (1993).

[BibTeX]
BibTeX: 
@article{Makowski1993,
  author = {Makowski, Jerzy and Hoppe, Ulrich and Stumpf, Helmut},
  title = {On intrinsic geometry of continua with microstructure},
  journal = {Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM)},
  year = {1993},
  volume = {73},
  pages = {T337-T339}
}

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