Probabilistic multiscale analysis of inelastic localized failure in solid mechanics

Adnan Ibrahimbegovic; Hermann G. Matthies

doi:10.24423/cames.94

Adnan Ibrahimbegovic Ecole Normale Superieure, Cachan
Hermann G. Matthies TU Braunschweig, Braunschweig

DOI: http://dx.doi.org/10.24423/cames.94

Abstract

In this work, we discuss the role of probability in providing the most appropriate multiscale based uncertainty quantification for the inelastic nonlinear response of heterogeneous materials undergoing localized failure. Two alternative approaches are discussed: i) the uncertainty quantification in terms of constructing the localized failure models with random field as parameters of failure criterion, ii) the uncertainty quantification in terms of the corresponding Bayesian updates of the corresponding evolution equation. The detailed developments are presented for the model problem of cement-based composites, with a two- phase meso-scale representation of material microstructure, where the uncertainty stems from the random geometric arrangement of each phase. Several main ingredients of the proposed approaches are discussed in detail, including microstructure approximation with a structured mesh, random field KLE representation, and Bayesian update construction. We show that the first approach is more suitable for the general case where the loading program is not known and the best one could do is to quantify the randomness of the general failure criteria, whereas the second approach is more suitable for the case where the loading program is prescribed and one can quantify the corresponding deviations. More importantly, we also show that models of this kind can provide a more realistic prediction of localized failure phenomena including the probability based interpretation of the size effect, with failure states placed anywhere in-between the two classical bounds defined by continuum damage mechanics and linear fracture mechanics.

Keywords

multiscale analysis, inelastic behavior, uncertainty quantification, fracture, size-effect,

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