An extended Hamilton principle as unifying theory for coupled problems and dissipative microstructure evolution
- An established strategy for material modeling is provided by energy-based principles such that evolution equations in terms of ordinary differential equations can be derived. However, there exist a variety of material models that also need to take into account non-local effects to capture microstructure evolution. In this case, the evolution of microstructure is described by a partial differential equation. In this contribution, we present how Hamilton's principle provides a physically sound strategy for the derivation of transient field equations for all state variables. Therefore, we begin with a demonstration how Hamilton’s principle generalizes the principle of stationary action for rigid bodies. Furthermore, we show that the basic idea behind Hamilton’s principle is not restricted to isothermal mechanical processes. In contrast, we propose an extended Hamilton principle which is applicable to coupled problems and dissipative microstructure evolution. As example, we demonstrate how the field equations for all state variables for thermo-mechanically coupled problems, i.e., displacements, temperature, and internal variables, result from the stationarity of the extended Hamilton functional. The relation to other principles, as the principle of virtual work and Onsager's principle, is given. Finally, exemplary material models demonstrate how to use the extended Hamilton principle for thermo-mechanically coupled elastic, gradient-enhanced, rate-dependent, and rate-independent materials.
Author: | Philipp JunkerORCiDGND, Daniel BalzaniORCiDGND |
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URN: | urn:nbn:de:hbz:294-98181 |
DOI: | https://doi.org/10.1007/s00161-021-01017-z |
Parent Title (English): | Continuum mechanics and thermodynamics |
Publisher: | Springer |
Place of publication: | Berlin |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/04/12 |
Date of first Publication: | 2021/06/07 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Coupled processes; Local and non-local effects; Multi-physics; Variational modeling |
Volume: | 33 |
First Page: | 1931 |
Last Page: | 1956 |
Note: | Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich. |
Institutes/Facilities: | Lehrstuhl für Kontinuumsmechanik |
Dewey Decimal Classification: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau |
open_access (DINI-Set): | open_access |
faculties: | Fakultät für Maschinenbau |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |