The failure in "quasibrittle" microstructural systems, occurring with no early warning, is a debated problem of great practical importance for the structural engineering community. Available models do not fully account for typical sample-size effects observed in fracture initiation and propagation. The Krajcinovic approach (K-approach) proposed here stems from a posthumous interpretation of Krajcinovic's original ideas and offers a new route to tackle such effects by means of an advanced fractal scheme, which consists of the sequential application of the Family-Vicsek scaling laws for the number of damage events n(ε; L) in the fracture initiation and propagation regimes separately. The procedure is developed and explained in the context of an established lattice models under static tensile testing. Average simulation data for any outer-size L - here ranging from 24 to 192 - is shown to scale nicely by this method, throughout the entire damage process. The proper definition of the damage parameter D allows deploying the deduced scaling laws to deduce the actual stress vs. strain relationship applicable in engineering. The discussion extends with no prejudice to data from real experiments, provided that all necessary information is gathered and all underlying assumptions hold true. The approach shall appeal per se also to the larger scientific community of physicists and mathematicians involved in statistical mechanics and random network failure. © 2014 Elsevier Ltd. All rights reserved.
|Titolo:||The Krajcinovic approach to model size dependent fracture in quasi-brittle solids|
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||1.1 Articolo in rivista|