Exhaustion of extensional ductility by torsional prestrain

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:37:40Z
dc.date.available	2014-03-01T01:37:40Z
dc.date.issued	1966	en
dc.identifier.issn	00207403	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21609
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-49949139557&partnerID=40&md5=3bc3503da642d6b787fc58db4c6a51ae	en
dc.title	Exhaustion of extensional ductility by torsional prestrain	en
heal.type	journalArticle	en
heal.publicationDate	1966	en
heal.abstract	Cylindrical bars made of low-carbon steel designated as DIN St.37 were subjected to various amounts of torsion. The pretwisted bars were then sliced longitudinally and tested in pure tension up to fracture. The combination of a torsion-tension test was sufficient to initiate low-strain statie fractures provided that the twisting angle exceeded a strain limit. This exhaustion limit may correspond to an abrupt reduction of the remaining ductility, which may result in a brittle fracture of a notched member if it is tested in tension. The experimental study revealed important features of the influence of torsional prestrain on the embrittlement for low carbon steels and yielded the mode of exhaustion of ductility with the increase of twisting angle. The elongation at fracture versus twisting strain curve presents a shape of an equilateral hyperbola indicating that the larger part of ductility of the material is reduced rapidly for small amounts of prestrain, while the remaining part necessitates excessive amounts of pretwisting to be exhausted. Comparison of the shear strain-tension elongation curve obtained by a torsion-tension combination with the corresponding equivalent compression strain-tension elongation curve derived from a precompression-tension test showed the effectiveness of the former combination in exhausting the ductility of the material. © 1966.	en
heal.journalName	International Journal of Mechanical Sciences	en
dc.identifier.volume	8	en
dc.identifier.issue	4	en
dc.identifier.spage	271	en
dc.identifier.epage	280	en