Computational homogenisation of phase-field fracture
Journal article, 2021

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 (RVE) 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.

homogenisation

multi-scale

phase-field fracture

macro-homogeneity

Author

Ritukesh Bharali

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Fredrik Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ralf Jänicke

Technische Universität Braunschweig

European Journal of Mechanics, A/Solids

0997-7538 (ISSN)

Vol. 88

Modeling of desiccation cracking in soils due to climate change

Formas (2018-01249), 2019-01-01 -- 2022-12-31.

Subject Categories

Applied Mechanics

DOI

10.1016/j.euromechsol.2021.104247

More information

Latest update

3/12/2021