The elastic field around the crack tip measured by scanning electromicroscopy

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:08:10Z
dc.date.available	2014-03-01T01:08:10Z
dc.date.issued	1990	en
dc.identifier.issn	0013-7944	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10315
dc.subject.classification	Mechanics	en
dc.subject.other	Elasticity	en
dc.subject.other	Materials--Cracks	en
dc.subject.other	Microscopic Examination--Scanning Electron Microscopy	en
dc.subject.other	Plates--Cracks	en
dc.subject.other	Strain	en
dc.subject.other	Crack Tip	en
dc.subject.other	Elastic Fields Around Crack Tips	en
dc.subject.other	Stress Fields	en
dc.subject.other	Fracture Mechanics	en
dc.title	The elastic field around the crack tip measured by scanning electromicroscopy	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-7944(90)90073-P	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-7944(90)90073-P	en
heal.language	English	en
heal.publicationDate	1990	en
heal.abstract	A whole field method was developed for the evaluation of the relative displacements and strains around the tip of a cracked plate loaded elastically, but using measurements with a scanning electron microscope (SEM). The radial displacements were measured at data points defined by the positions of fine grains of a powder layer sprayed on the top of an aluminium coating. By using the possibilities of the SEM for deep focussing, it was possible to develop a versatile method, whose sensitivity is increased with large magnifications of the instrument. This fact allowed the use of the method with the same accuracy and sensitivity not only very close to the crack tip, where strong strain gradients exist but also far away from it, where moderate strain gradients develop. The method is versatile and highly accurate everywhere in the stress field around the crack, since it defines, in advance, the number of terms in the Williams series development of the expressions for displacements and strains. The method is convenient not only for elastic, but also for plastic strain fields, provided the appropriate relationships are introduced in the evaluation of strains. © 1990.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Engineering Fracture Mechanics	en
dc.identifier.doi	10.1016/0013-7944(90)90073-P	en
dc.identifier.isi	ISI:A1990EK78200004	en
dc.identifier.volume	37	en
dc.identifier.issue	4	en
dc.identifier.spage	739	en
dc.identifier.epage	751	en