The Griffith-Orowan fracture theory revisited. The T-Criterion

Andrianopoulos, NP; Theocaris, PS

dc.contributor.author	Andrianopoulos, NP	en
dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:06:30Z
dc.date.available	2014-03-01T01:06:30Z
dc.date.issued	1985	en
dc.identifier.issn	0020-7403	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9423
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	MATERIALS SCIENCE - Theory	en
dc.subject.other	FRACTURE MECHANISM	en
dc.subject.other	GRIFFITH-OROWAN FRACTURE THEORY	en
dc.subject.other	YIELDING MECHANISM	en
dc.subject.other	FRACTURE MECHANICS	en
dc.title	The Griffith-Orowan fracture theory revisited. The T-Criterion	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0020-7403(85)90010-4	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0020-7403(85)90010-4	en
heal.language	English	en
heal.publicationDate	1985	en
heal.abstract	In the present paper a new fracture criterion (the T-criterion) is described. It is based on the Griffith fracture theory, as modified by Orowan, according to which failure is the result of the mutual action of both fracture and yielding mechanisms. The main idea of the T-criterion is that fracture is caused by normal stresses, whose contribution is included in the dilatational part TV of the strain-energy density. It is then postulated that fracture will initiate outside the plastic region surrounding the crack-tip, when TV reaches a critical value. On the other hand, plasticity depends on the distortional part of strain-energy density and its extent is defined by the Mises yield locus, which is used for the calculation of the elastic-plastic boundary, along which TV is computed. Then, the TV = f(θ{symbol}) curve around the crack constitutes a physically sound curve of the distribution of the total elastic strain-energy density there. Then, the critical TV,0- and TD,0-parameters control the failure behaviour of the material and, thus, the T-criterion can distinguish between failure by fracture or yielding. A study is made on the relative validity of the expected angle of crack propagation, especially in ductile materials. Different predictions are obtained from the T-criterion, as they are compared to those of an up-to-now popular criterion suitable only for brittle fractures. Experimental data show good agreement with the predictions of the T-criterion, especially for the critical stress for fracture. © 1985.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Mechanical Sciences	en
dc.identifier.doi	10.1016/0020-7403(85)90010-4	en
dc.identifier.isi	ISI:A1985A800600010	en
dc.identifier.volume	27	en
dc.identifier.issue	11-12	en
dc.identifier.spage	793	en
dc.identifier.epage	801	en