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Nonlocal continuum damage models based on discrete meso-scale analysis

Discrete mesoscopic analysis of the fracture process in a heterogeneous material subjected to uniaxial tension.

Macroscopic continuum analysis of the fracture process of a compact tension test with a nonlocal damage-plastic model.

Linking surface roughness to width of fracture process zone.

We aim to develop macroscopic nonlocal damage models for the prediction of the nonlinear fracture process of quasibrittle materials based on discrete mesoscale analysis.

Nonlocal damage models are based on the averaging of history variables and are used successfully as localisation limiters in the analysis of fracture of heterogeneous materials. However, at present the choice of the variable to be averaged and the form of the averaging operator is not unique, since they are based on inverse analysis.
Furthermore, there is no consensus in the research community how the averaging operator should be formulated in the presence of geometric boundaries.

Therefore, we are trying to develop a direct link between stochastic mesoscale models and macroscopic nonlocal models, which will help to reduce the ambiguity of existing models.

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Last updated by Peter Grassl