Yield criteria based on void coalescence mechanisms

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:06:43Z
dc.date.available	2014-03-01T01:06:43Z
dc.date.issued	1986	en
dc.identifier.issn	0020-7683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9580
dc.subject.classification	Mechanics	en
dc.subject.other	FRACTURE MECHANICS - Analysis	en
dc.subject.other	MATERIALS - Defects	en
dc.subject.other	STRAIN - Evaluation	en
dc.subject.other	DUCTILE FRACTURE	en
dc.subject.other	MICROSCOPIC VOIDS	en
dc.subject.other	VOID COALESCENCE	en
dc.subject.other	PLATES	en
dc.title	Yield criteria based on void coalescence mechanisms	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0020-7683(86)90016-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0020-7683(86)90016-8	en
heal.language	English	en
heal.publicationDate	1986	en
heal.abstract	The mode of deformation and fracture between a pair of holes in an infinite plate submitted to uniaxial tension was studied in order to gain insight for the mechanism of ductile fracture. Void development and coalescence is accepted to constitute the basic mechanism for the creation of a cloud of defects, developed around cracks, and contributing significantly to the ductile-fracture process. The holes were considered small, in comparison to their intercentre distance, but sufficiently close to interact and concentrate slip between them. The influence of the orientation of holes on the strain state at fracture was studied for any intermediate case of loading between planestress and plane-strain conditions. Fracture occurred, in general, by flow localization between holes under an insignificant hole growth. The method of pseudocaustics in transmission or reflection, together with electronic scanning microscopy, proved the existence of a transition in fracture mode with the orientation of holes indicating a transition at 55°, from an intercentre necking, to an out-of-intercentre line pitting for plane-stress overall-conditions. This mode changed to a general out-of-the-intercentre-line necking for plane-strain conditions. Scanning electron microscopy indicated the mode of creation of initial hollow dimples, inside a critical area around the crack tip, and its evolution and intensification of dimple-penetration with the progress of loading. By interrelating experimental data, which support the validity of yielding criteria depending on the applied mean-normal stress and dilatancy of materials, the appropriate quantities were evaluated defining the formation and development of voids and allowed the connection of these data with modern yield criteria for ductile materials based on growth of holes. © 1986.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Solids and Structures	en
dc.identifier.doi	10.1016/0020-7683(86)90016-8	en
dc.identifier.isi	ISI:A1986D174900007	en
dc.identifier.volume	22	en
dc.identifier.issue	4	en
dc.identifier.spage	445	en
dc.identifier.epage	466	en