Crack initiation direction from interface of bonded dissimilar media

Spyropoulos, CP

dc.contributor.author	Spyropoulos, CP	en
dc.date.accessioned	2014-03-01T01:18:48Z
dc.date.available	2014-03-01T01:18:48Z
dc.date.issued	2003	en
dc.identifier.issn	0167-8442	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15206
dc.subject	a priori knowledge	en
dc.subject	Crack Initiation	en
dc.subject	Density Functional	en
dc.subject	Elastic Moduli	en
dc.subject	Interface Crack	en
dc.subject	Fixed Ratio	en
dc.subject	Strain Energy Density	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Aluminum	en
dc.subject.other	Crack initiation	en
dc.subject.other	Debonding	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Stresses	en
dc.subject.other	Biaxial load factor	en
dc.subject.other	Fracture	en
dc.subject.other	crack initiation	en
dc.subject.other	fracture mechanics	en
dc.subject.other	crack	en
dc.subject.other	fracture initiation	en
dc.subject.other	fracture mechanics	en
dc.title	Crack initiation direction from interface of bonded dissimilar media	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-8442(02)00141-6	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-8442(02)00141-6	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Debonded region of an interface between two dissimilar materials are modeled as a line crack that tends to enhance the initiation of failure by fracture. Depending on the load that interacts with dissimilar materials, no a priori knowledge of how failure would initiate from an existing interface crack is assumed. By application of the strain energy density criterion, potential crack initiation sites are obtained for different biaxial loading states and materials with dissimilar properties. Numerical results are obtained for an epoxy/aluminum medium. In each case, a finite line segment of debonding is assumed. Uniform stresses are applied normal and parallel to the interface so that a biaxial load factor k determines the relative magnitude of biaxiality. Positive and negative k correspond, respectively, to applied tension and compression parallel to the interface. For a fixed ratio of the elastic moduli, crack initiation angles measured from the interface would increase with positive k and decrease with an increase of negative k. These findings are presented for different values of k. The direction of maximum yield initiation could also be determined from the stationary values of the strain density function. These locations are identified with elements that undergo excessive distortion while the possible fracture sites are assumed to coincide with regions where dilatational effects would dominate. (C) 2003 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Theoretical and Applied Fracture Mechanics	en
dc.identifier.doi	10.1016/S0167-8442(02)00141-6	en
dc.identifier.isi	ISI:000180239700008	en
dc.identifier.volume	39	en
dc.identifier.issue	1	en
dc.identifier.spage	99	en
dc.identifier.epage	105	en