eprintid: 2306
rev_number: 7
eprint_status: archive
userid: 56
dir: disk0/00/00/23/06
datestamp: 2014-10-09 09:32:08
lastmod: 2014-10-09 09:32:08
status_changed: 2014-10-09 09:32:08
type: article
metadata_visibility: show
creators_name: Corrado, Mauro
creators_name: Paggi, Marco
creators_name: Carpinteri, Alberto
creators_id: mauro.corrado@polito.it
creators_id: marco.paggi@imtlucca.it
creators_id: 
title: A multi-scale numerical method for the study of size-Scale effects in ductile fracture
ispublished: pub
subjects: TJ
divisions: CSA
full_text_status: public
abstract: The use of a stress-strain constitutive relation for the undamaged material and a traction-separation cohesive crack model with softening for cracking has been demonstrated to be an effective strategy to predict and explain the size-scale effects on the mechanical response of quasi-brittle materials. In metals, where ductile fracture takes place, the situation is more complex due to the interplay between plasticity and fracture. In the present study, we propose a multi-scale numerical method where the shape of a global constitutive relation used at the macro-scale, the so-called hardening cohesive zone model, can be deduced from meso-scale numerical simulations of polycrystalline metals in tension. The shape of this constitutive relation, characterized by an almost linear initial branch followed by a plastic plateau with hardening and finally by softening, is in fact the result of the interplay between two basic forms of nonlinearities: elasto-plasticity inside the grains and classic cohesive cracking for the grain boundaries. 
date: 2014-08-27
date_type: published
publication: Metals
volume: 4
number: 3
publisher: MDPI
pagerange: 428-444
id_number: 10.3390/met4030428
refereed: TRUE
issn: 2075-4701
official_url: http://dx.doi.org/10.3390/met4030428
citation:   Corrado, Mauro and Paggi, Marco and Carpinteri, Alberto  A multi-scale numerical method for the study of size-Scale effects in ductile fracture.  Metals, 4 (3).  pp. 428-444.  ISSN 2075-4701      (2014)  
document_url: http://eprints.imtlucca.it/2306/1/metals-04-00428.pdf