The form and position of the core region: Its influence on the fracture criteria

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:07:17Z
dc.date.available	2014-03-01T01:07:17Z
dc.date.issued	1988	en
dc.identifier.issn	00137944	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9910
dc.subject.other	MATERIALS - Crack Propagation	en
dc.subject.other	STRESSES - Strain	en
dc.subject.other	DILATATIONAL STRAIN ENERGY DENSITY CRITERION	en
dc.subject.other	FRACTURE CRITERIA	en
dc.subject.other	TANGENTIAL STRESS CRITERION	en
dc.subject.other	FRACTURE MECHANICS	en
dc.title	The form and position of the core region: Its influence on the fracture criteria	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-7944(88)90256-1	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-7944(88)90256-1	en
heal.publicationDate	1988	en
heal.abstract	A comparative study of the fracture criteria based on energy concept indicated their relationships concerning the physical laws on which they are founded. Although the maximum strain energy release rate or G-criterion is based on sound physical concepts, the computational procedures necessary to define exactly the angle of crack extension for an arbitrary angled crack presents a formidable amount of calculations. On the other hand, the minimum strain energy density or S-criterion and the maximum dilatational or T-criterion are compared and their affinities have been established. It was shown that only in the cases when the total strain energy density is due to its distortional component both criteria coincide. Furthermore, the shape of the so-called core region, which normally in all criteria is assumed as a small circle, is one of the main causes of discrepancies of the results of the various criteria. On the contrary, an initial yield locus, which for the Mises yield criterion, takes a kidney-like shape, becomes the most logical locus on which a criterion should be tested. The T-criterion, using this yield locus as core region, is closer to reality and yields satisfactory results in the elastic, as well as in the small-scale yielding regions of loading. © 1988.	en
heal.journalName	Engineering Fracture Mechanics	en
dc.identifier.doi	10.1016/0013-7944(88)90256-1	en
dc.identifier.volume	30	en
dc.identifier.issue	1	en
dc.identifier.spage	77	en
dc.identifier.epage	85	en