Structural rearrangements during yielding of glassy polymers

Kontou, E; Spathis, G

dc.contributor.author	Kontou, E	en
dc.contributor.author	Spathis, G	en
dc.date.accessioned	2014-03-01T01:14:12Z
dc.date.available	2014-03-01T01:14:12Z
dc.date.issued	1998	en
dc.identifier.issn	0032-3888	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12919
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Mathematical models	en
dc.subject.other	Polymeric glass	en
dc.subject.other	Shear deformation	en
dc.subject.other	Strain	en
dc.subject.other	Stress analysis	en
dc.subject.other	Stress relaxation	en
dc.subject.other	Tensile properties	en
dc.subject.other	Viscoplasticity	en
dc.subject.other	Strain softening	en
dc.subject.other	Tensile yield	en
dc.subject.other	Polycarbonates	en
dc.title	Structural rearrangements during yielding of glassy polymers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/pen.10315	en
heal.identifier.secondary	http://dx.doi.org/10.1002/pen.10315	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	The tensile yield and post yield behavior of polycarbonate (PC) are examined by means of a new experimental device, based on a noncontact measurement of the deformation. This method has the advantage of a detailed measurement of the deformation along the gauge length, which leads to the construction of the true stress-strain curves of the material tested. Especially in the case of nonuniform deformation, where neck initiation and neck propagation occurs, the correct description of the intrinsic response of the material requires true stress-strain plots. A viscoplastic model based on the fundamental assumptions of Eyring is used to describe the yield and post-yield behavior of PC. The strain softening is attributed to a relaxation mechanism that was introduced in previous treatments, and this effect is supported by DSC tests. The theoretical results are compared with the results obtained by an elasto-plastic model, developed elsewhere, and it is shown that the material follows a viscoplastic path in this deformation procedure.	en
heal.publisher	SOC PLASTICS ENG INC	en
heal.journalName	Polymer Engineering and Science	en
dc.identifier.doi	10.1002/pen.10315	en
dc.identifier.isi	ISI:000076171900010	en
dc.identifier.volume	38	en
dc.identifier.issue	9	en
dc.identifier.spage	1443	en
dc.identifier.epage	1449	en