Viscoplastic deformation of an epoxy resin at elevated temperatures

Kontou, E

dc.contributor.author	Kontou, E	en
dc.date.accessioned	2014-03-01T01:25:29Z
dc.date.available	2014-03-01T01:25:29Z
dc.date.issued	2006	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17681
dc.subject	Activation volume evolution	en
dc.subject	Eyring model	en
dc.subject	Viscoplasticity	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Dynamic mechanical analysis	en
dc.subject.other	Glass transition	en
dc.subject.other	Parameter estimation	en
dc.subject.other	Probability density function	en
dc.subject.other	Stress relaxation	en
dc.subject.other	Viscoplasticity	en
dc.subject.other	Viscosity	en
dc.subject.other	Activation volume evolution	en
dc.subject.other	Deformation tensors	en
dc.subject.other	Elevated temperatures	en
dc.subject.other	Eyring model	en
dc.subject.other	Strain rates	en
dc.subject.other	Epoxy resins	en
dc.subject.other	decomposition	en
dc.subject.other	deformation	en
dc.subject.other	epoxy resin	en
dc.subject.other	glass transition temperature	en
dc.subject.other	loading (testing)	en
dc.subject.other	mathematical model	en
dc.subject.other	stress-strain property	en
dc.subject.other	tensile property	en
dc.subject.other	viscosity	en
dc.title	Viscoplastic deformation of an epoxy resin at elevated temperatures	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.23768	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.23768	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The tensile behavior under monotonic loading and stress-relaxation testing of an epoxy resin has been studied. Experimental data at various strain rates and three temperatures from ambient up to just below T. were performed, to study the transition from the brittle behavior to a ductile and therefore viscoplastic one. Dynamic mechanical analysis was applied to study the glass transition region of the material. Furthermore, a three-dimensional viscoplastic model was used to simulate the experimental results. This model incorporates all features of yield, strain softening, strain hardening, and rate/temperature dependence. The multiplicative decomposition of the deformation tensor into an elastic and viscoplastic part has also been applied, following the element arrangement in the mechanical model. A stress-dependent viscosity was controlling the stress-strain material behavior, involving model parameters, calculated from the Eyring plots. A new equation for the evolution of the activation volume with deformation was proposed, based on a probability density function. The model capability was further verified by applying the same set of parameters to predict with a good accuracy the stress-relaxation data as well. (c) 2006 Wiley Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.23768	en
dc.identifier.isi	ISI:000238637300106	en
dc.identifier.volume	101	en
dc.identifier.issue	3	en
dc.identifier.spage	2027	en
dc.identifier.epage	2033	en