The ""twin-crack"" model and the T-criterion in predicting dynamic instability for asymmetric cracks

Theocaris, PS; Andrianopoulos, NP; Kourkoulis, SK

dc.contributor.author	Theocaris, PS	en
dc.contributor.author	Andrianopoulos, NP	en
dc.contributor.author	Kourkoulis, SK	en
dc.date.accessioned	2014-03-01T01:09:05Z
dc.date.available	2014-03-01T01:09:05Z
dc.date.issued	1992	en
dc.identifier.issn	0013-7944	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10829
dc.subject	Dynamic Instability	en
dc.subject.classification	Mechanics	en
dc.subject.other	Cracks	en
dc.subject.other	Fracture mechanics	en
dc.subject.other	Geometry	en
dc.subject.other	Mathematical models	en
dc.subject.other	Statistical methods	en
dc.subject.other	Stresses	en
dc.subject.other	Asymmetric cracks	en
dc.subject.other	Dynamic instability prediction	en
dc.subject.other	Macroscopic crack branching	en
dc.subject.other	Microcracks	en
dc.subject.other	Stress intansity factors	en
dc.subject.other	Twin crack model	en
dc.subject.other	Crack propagation	en
dc.title	The ""twin-crack"" model and the T-criterion in predicting dynamic instability for asymmetric cracks	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-7944(92)90117-W	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-7944(92)90117-W	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	The phenomenon of directional instability of running cracks is studied by means of a ""twin-crack"" model. The running single crack tip is simulated by a cloud of microcracks under the form of hackles with random lengths and orientations, which, finally, are reduced into a flat front with two dominant microbranches at their corners. A suitable fracture criterion is applied in its double geometry in order to predict the future behaviour of this pattern. The predictions obtained agree well with existing experimental evidence concerning branching angles and give strong indications that other instability phenomena (such as curving, kinking and arrest) could be approached through the same model. It is finally concluded that directional instability is governed by two groups of factors, deterministic (macroscopic) and stochastic (microscopic), and, thus, the existence of sharp critical instability conditions seems not to be natural. © 1992.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Engineering Fracture Mechanics	en
dc.identifier.doi	10.1016/0013-7944(92)90117-W	en
dc.identifier.isi	ISI:A1992JP74800001	en
dc.identifier.volume	43	en
dc.identifier.issue	2	en
dc.identifier.spage	137	en
dc.identifier.epage	146	en