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Critical assessment of the application of the J-integral and CTOD concepts to circumferentially cracked copper bars

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Pardoen, Thomas [UCL] Delannay, Francis [UCL]

The aim of this work is to explore experimentally the validity of the concepts of J-integral and crack tip opening displacement for characterizing the stress and strain state at the tip of an axisymmetrical crack in a bar undergoing large plastic strain before crack extension. The tests are made on extruded copper round bars presenting a very high ductility. Three different analytical formulations of the J-integral proposed in the literature for circumferentially cracked bars are compared at initiation of cracking. The limit between shallow crack and deep crack geometries is experimentally demonstrated. It is found that, in neither of these geometries, J and delta CTOD are dominant. However, the ratio J(c)/delta(c) is constant for deep cracks, which suggests an alternative fracture criterion consisting in postulating the dissipation of an average critical energy per unit volume until crack extension.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 1996
Language Anglais
Journal information "International Journal of Fracture" - Vol. 79, no. 4, p. 373-391 (1996)
Peer reviewed yes
Publisher Kluwer Academic Publ (Dordrecht)
issn 0376-9429
e-issn 1573-2673
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
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Bibliographic reference Pardoen, Thomas ; Delannay, Francis. Critical assessment of the application of the J-integral and CTOD concepts to circumferentially cracked copper bars. In: International Journal of Fracture, Vol. 79, no. 4, p. 373-391 (1996)
Permanent URL http://hdl.handle.net/2078.1/46775