Blunting phenomena in cracked ductile plates under mixed mode conditions

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:07:05Z
dc.date.available	2014-03-01T01:07:05Z
dc.date.issued	1988	en
dc.identifier.issn	00137944	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9787
dc.subject	Mixed Mode	en
dc.title	Blunting phenomena in cracked ductile plates under mixed mode conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-7944(88)90070-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-7944(88)90070-7	en
heal.publicationDate	1988	en
heal.abstract	The mode of blunting of the tips in cracked ductile plates was experimentally and graphically studied by assuming plane-stress conditions in the cracked plates and small scale yielding developed at the crack front. The material is supposed to be elastic-perfectly plastic, plastically incompressible. Oblique edge cracks, of different angles β of obliquity, created mixed mode conditions of loading. The experimental study was executed in a scanning electron microscope and the specimens used were made of polycarbonate. By applying a progressively increasing tensile load to an initially sawn oblique edge-crack, the various steps of development of blunting of crack tips was recorded and studied. The experimental results checked with the results derived by tracing the slip-line field for the various angles β of obliquity and for plane-stress conditions. Experimental evidence helped to form the respective slip-line fields for blunted cracks and indicated that the forms of blunting for plane-stress are different from the ""Japanese-sword"" types of blunting for plane strain. The forms of the plastically deformed crack tips indicated the certain existence of corners which supported previous assumptions of very rapid radial stress changes resembling to stress jumps. It was also shown that the positions of these tail-jumps in σrr-stresses coincided with the deformed flanks of the blunted cracks thus yielding a reasonable explanation of these lines being coincident with the deformed boundaries. © 1988.	en
heal.journalName	Engineering Fracture Mechanics	en
dc.identifier.doi	10.1016/0013-7944(88)90070-7	en
dc.identifier.volume	31	en
dc.identifier.issue	2	en
dc.identifier.spage	255	en
dc.identifier.epage	270	en