eprintid: 3221
rev_number: 6
eprint_status: archive
userid: 69
dir: disk0/00/00/32/21
datestamp: 2016-03-11 13:18:00
lastmod: 2016-03-11 13:18:00
status_changed: 2016-03-11 13:18:00
type: article
succeeds: 3220
metadata_visibility: show
creators_name: Morini, Lorenzo
creators_name: Piccolroaz, Amdrea
creators_name: Mishuris, Gennady
creators_name: Radi, Enrico
creators_id: lorenzo.morini@imtlucca.it
creators_id: 
creators_id: 
creators_id: 
title: On fracture criteria for dynamic crack propagation in elastic materials with couple stresses
ispublished: pub
subjects: TA
subjects: TH
divisions: CSA
full_text_status: none
monograph_type: working_paper
keywords: Couple stress elasticity; Dynamic fracture; Steady-state propagation; Energy release rate; Fracture criterion
abstract: The focus of the article is on fracture criteria for dynamic crack propagation in elastic materials with microstructures. Steady-state propagation of a Mode III semi-infinite crack subject to loading applied on the crack surfaces is considered. The micropolar behavior of the material is described by the theory of couple-stress elasticity developed by Koiter. This constitutive model includes the characteristic lengths in bending and torsion, and thus it is able to account for the underlying microstructures of the material. Both translational and micro-rotational inertial terms are included in the balance equations, and the behavior of the solution near to the crack tip is investigated by means of an asymptotic analysis. The asymptotic fields are used to evaluate the dynamic J-integral for a couple-stress material, and the energy release rate is derived by the corresponding conservation law. The propagation stability is studied according to the energy-based Griffith criterion and the obtained results are compared to those derived by the application of the maximum total shear stress criterion.
date: 2013
date_type: published
publication: International Journal of Engineering Science
volume: 71
publisher: Elsevier
pagerange: 45-61
id_number: 10.1016/j.ijengsci.2013.05.005
institution: IMT Institute for Advanced Studies Lucca
refereed: TRUE
issn: 0020-7225
official_url: http://www.sciencedirect.com/science/article/pii/S0020722513000839
citation:   Morini, Lorenzo and Piccolroaz, Amdrea and Mishuris, Gennady and Radi, Enrico  On fracture criteria for dynamic crack propagation in elastic materials with couple stresses.  International Journal of Engineering Science, 71.  pp. 45-61.  ISSN 0020-7225      (2013)