Universal mechanical response of polypropylene under cyclic deformation

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dc.authoridDrozdov, Aleksey -- 0000-0002-6049-5813; Dusunceli, Necmi -- 0000-0002-2841-7882
dc.contributor.authorDrozdov, Aleksey
dc.contributor.authorDüşünceli, Necmi
dc.date.accessioned13.07.201910:50:10
dc.date.accessioned2019-07-16T09:15:04Z
dc.date.available13.07.201910:50:10
dc.date.available2019-07-16T09:15:04Z
dc.date.issued2012
dc.departmentMühendislik Fakültesi
dc.description.abstractExperimental data are reported on isotactic polypropylene in uniaxial tensile (i) cyclic tests (oscillations between maximum strain 0.15 and the zero minimum stress) with various cross-head speeds and (ii) relaxation tests at temperatures ranging from room temperature to 100 degrees C. Observations in cyclic tests show that maximum stresses decrease, while minimum strains grow with the number of cycles. A universal character is revealed of the dependence of minimum strain on the number of cycles: this function is independent of temperature and weakly affected by strain rate. To rationalize this observation, constitutive equations are proposed in cyclic viscoelasticity and viscoplasticity of semicrystalline polymers and a scenario is suggested for damage accumulation. Two types of damage are distinguished which are induced by (i) lamellar fragmentation in the crystalline phase and (ii) nucleation and growth of micro-voids in the amorphous matrix. The stress-strain relations involve five adjustable parameters that are found by fitting observations (50 cycles of loading-retraction) at room temperature and alpha-transition point. Numerical simulation demonstrates that the model correctly describes experimental data and can predict observations in tests with a large number of cycles.
dc.description.sponsorshipEuropean Commission [Nanotough-213436]; TUBITAK
dc.description.sponsorshipADD acknowledges financial support by the European Commission through project Nanotough-213436. ND acknowledges fellowship support by TUBITAK.
dc.identifier.doi10.1515/POLYENG.2011.602
dc.identifier.endpage41en_US
dc.identifier.issn0334-6447
dc.identifier.issn2191-0340
dc.identifier.issue1en_US
dc.identifier.scopusqualityQ3
dc.identifier.startpage31en_US
dc.identifier.urihttps://doi.org/10.1515/POLYENG.2011.602
dc.identifier.urihttps://hdl.handle.net/20.500.12451/4277
dc.identifier.volume32en_US
dc.identifier.wosWOS:000313415700005
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWALTER DE GRUYTER GMBH
dc.relation.ispartofJOURNAL OF POLYMER ENGINEERING
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectPolypropylene
dc.subjectThermal Effects
dc.subjectViscoelasticity
dc.subjectViscoplasticity
dc.titleUniversal mechanical response of polypropylene under cyclic deformation
dc.typeArticle

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