Ductile branching modes in stable propagating cracks: An experimental study

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:07:51Z
dc.date.available	2014-03-01T01:07:51Z
dc.date.issued	1990	en
dc.identifier.issn	0013-7944	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10210
dc.subject	Experimental Study	en
dc.subject.classification	Mechanics	en
dc.subject.other	Fracture Mechanics--Testing	en
dc.subject.other	Polycarbonates--Crack Propagation	en
dc.subject.other	Crack Blunting	en
dc.subject.other	Crack Branching	en
dc.subject.other	Crack Curving	en
dc.subject.other	Crack Kinking	en
dc.subject.other	Ductile Branching	en
dc.subject.other	Plates	en
dc.title	Ductile branching modes in stable propagating cracks: An experimental study	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-7944(90)90294-Q	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-7944(90)90294-Q	en
heal.language	English	en
heal.publicationDate	1990	en
heal.abstract	An experimental study of the propagation of an edge crack in a polycarbonate plate under conditions of plane stress and mode I loading was undertaken in order to clarify phenomena of blunting, kinking, curving and branching of the propagated crack. Scanning electron microscope studies of the initiation of the ductile crack indicated clearly the decisive importance of the mode of blunting and kinking of the ductile crack before any steady state crack propagation. Previous experimental evidence showed the mode of plane stress blunting forming first a rounded-off flat crack front at its corners, which was followed by single or double kinking at the vicinities of the corners of flat front crack, which was evoluted either to a curving (when the single-kink phase was persisted) of the crack, or to a branching (when the double kink phase predominated). This initial branching was at the beginning following an exponential spiral slip-line, appertaining to the respective exponential spiral slip-line zone covering the front of the blunted crack, thus reducing progressively its angle of obliqueness. As the branches of the crack were receding from each other rather stable directions were established and the branches were propagating along these directions until another nucleus of a new branching was developing along the propagating cracks. The method of transmitted caustics gave an indication of the distribution of energies in the propagating branches and could be used for an exact calculation of these energies. Interesting phenomena related with the branching and curving of propagating cracks were divulged from this experimental study. © 1990.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Engineering Fracture Mechanics	en
dc.identifier.doi	10.1016/0013-7944(90)90294-Q	en
dc.identifier.isi	ISI:A1990DK36700012	en
dc.identifier.volume	36	en
dc.identifier.issue	3	en
dc.identifier.spage	477	en
dc.identifier.epage	493	en