Journal
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
Volume 88, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.euromechsol.2021.104247
Keywords
Phase-field fracture; Homogenisation; Macro-homogeneity; Multi-scale
Categories
Funding
- Swedish Research Council for Sustainable Development (FORMAS) [2018-01249]
- Swedish Research Council (VR) [2017-05192]
- Swedish Research Council [2017-05192] Funding Source: Swedish Research Council
- Vinnova [2018-01249] Funding Source: Vinnova
- Formas [2018-01249] Funding Source: Formas
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In this study, a computational homogenisation method for phase-field fractures is developed, leading to a two-scale phase-field fracture framework. The concept of selective homogenisation is introduced, showing local macro-scale material behavior in numerical experiments. Non-selective homogenisation yields a non-local macro-scale material behavior.
In this manuscript, the computational homogenisation of phase-field fractures is addressed. To this end, a variationally consistent two-scale phase-field fracture framework is developed, which formulates the coupled momentum balance and phase-field evolution equations at the macro-scale as well as at the Representative Volume Element (RVE1) scale. The phase-field variable represent fractures at the RVE scale, however, at the macro-scale, it is treated as an auxiliary variable. The latter interpretation follows from the homogenisation of the phase-field through volume or a surface-average. For either homogenisation choices, the set of macro-scale and sub-scale equations, and the pertinent macro-homogeneity satisfying boundary conditions are established. As a special case, the concept of selective homogenisation is introduced, where the phase-field is chosen to live only in the RVE domain, thereby eliminating the macro-scale phase-field evolution equation. Numerical experiments demonstrate the local macro-scale material behaviour of the selective homogenisation based two scale phase-field fracture model, while its non-selective counterpart yields a non-local macro-scale material behaviour.
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