Modelling of environmentally assisted material degradation in the crack phase-field framework
| Autor: | Rainer Falkenberg |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Mass transport
Materials science Field (physics) Mechanical Engineering Fracture mechanics 02 engineering and technology Mechanics 01 natural sciences 010101 applied mathematics Condensed Matter::Materials Science 020303 mechanical engineering & transports 0203 mechanical engineering Material Degradation Phase (matter) Coupling (piping) General Materials Science 0101 mathematics |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 233:5-12 |
| ISSN: | 2041-3076 1464-4207 |
| DOI: | 10.1177/1464420718761220 |
| Popis: | The simulation of crack propagation was conducted with a diffusive crack model in a variational framework. More, the physically sound introduction of mass transport and coupling mechanisms due to environmentally assisted effects could be realised in this framework. The objective consists of the application of the phase-field approach towards the simulation of environmentally assisted material degradation with the advantage of a non-required predefined crack path and a mesh-independent non-local formulation that facilitates the damage evolution with respect to material softening. The sharp crack is regularised by the introduction of a phase-field order parameter leading to a diffusive crack formulation. Besides the equations originating from the linear momentum balance an additional evolution equation for the crack phase-field is introduced. Furthermore, mass transport is simulated by a diffusion equation. The description delivered by the variational phase-field framework is able to simulate crack propagation according to published numerical test cases. Additionally, the calculation of stress intensity factors is possible as well as crack resistance curves that describe stable crack propagation. |
| Databáze: | OpenAIRE |
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