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The fracture process in quasi-brittle materials simulated using a lattice dynamical model

TitleThe fracture process in quasi-brittle materials simulated using a lattice dynamical model
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2019
AuthorsBirck, G., Rinaldi Antonio, and Iturrioz I.
JournalFatigue and Fracture of Engineering Materials and Structures
Volume42
Pagination2709-2724
ISSN8756758X
KeywordsBrittleness, Constitutive relations, Cracks, Damage detection, Damage localization, Damage mechanics, Discrete element modeling, Fracture, Fracture mechanics, Lattice methods, Material imperfections, Network configuration, Quasibrittle material
Abstract

The damage process in quasi-brittle materials is characterized by the evolution of a micro-crack field, followed by the joining of micro-cracks, stress localization and crack instability. In network models, masses are lumped at nodal points which are interconnected by one-dimensional elements with a bilinear constitutive relation, considering the energy consistency during the simulated process. In order to replicate the material imperfections, to render a realistic behaviour in damage localization, the model has not only random elastic and rupture properties, but also a geometric perturbation. In the present paper 2D plates with different levels of brittleness are simulated. The numerical results are presented in terms of global stress vs strain diagram, final network configuration, energy balance during the process and as geometric damage evolution. Therefore, the predictive potential of the lattice discrete element model to capture fracture processes in quasi-brittle materials is demonstrated. © 2019 Wiley Publishing Ltd.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85070334118&doi=10.1111%2fffe.13094&partnerID=40&md5=3cd5cd859f574376ac7caffba0a1178e
DOI10.1111/ffe.13094
Citation KeyBirck20192709