Crack propagation in brittle materials under compressive stresses studied by caustics

Theocaris, PS; Sakellariou, M

dc.contributor.author	Theocaris, PS	en
dc.contributor.author	Sakellariou, M	en
dc.date.accessioned	2014-03-01T01:08:18Z
dc.date.available	2014-03-01T01:08:18Z
dc.date.issued	1991	en
dc.identifier.issn	0022-2461	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10398
dc.subject	Boundary Condition	en
dc.subject	Crack Propagation	en
dc.subject	Experimental Study	en
dc.subject	Stress Distribution	en
dc.subject	Stress Field	en
dc.subject	Stress Intensity Factor	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.title	Crack propagation in brittle materials under compressive stresses studied by caustics	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF00544676	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF00544676	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	An experimental study was undertaken concerning the propagation of a slant crack under compression. By using the equations of the deformed shape of a crack and by introducing a correction model in order to prevent the crack lips from incompatible displacements, an estimate of the stress distribution along the crack borders was achieved. It was found that an opening-mode K(l) stress intensity factor (SIF) must be introduced at the crack tips in the overall compressive stress field, in order to give the required space for the lip-slip phenomenon, due to shearing, to take place. This local dilatation in the vicinity of the crack tip, together with the lip-slip phenomenon, due to shearing, to take place. This local dilatation in the vicinity of the crack tip, together with the lip-slip phenomenon, due to which the initial crack tip is displaced into a new position along the deformed crack borders, causes the out-of-plane propagation of the crack, either towards the largest compressive stress in the case of biaxial stress field, or towards the applied compression in a uniaxial compressive field. A series of experiments on PMMA (perspex) rectangular specimens with pre-existed cracks and slits has been executed and the type of the stress field in the front of the propagated branches is examined by using the method of caustics. It was found that the crack propagation under compression is an interactive process of two conjugate branches, which is strongly influenced by the boundary conditions of the pre-existed discontinuity.	en
heal.publisher	Kluwer Academic Publishers	en
heal.journalName	Journal of Materials Science	en
dc.identifier.doi	10.1007/BF00544676	en
dc.identifier.isi	ISI:A1991FD59000028	en
dc.identifier.volume	26	en
dc.identifier.issue	6	en
dc.identifier.spage	1640	en
dc.identifier.epage	1646	en