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Article: Invariant elastic modulus of viscoelastic materials measured by rate-jump tests

TitleInvariant elastic modulus of viscoelastic materials measured by rate-jump tests
Authors
KeywordsElastic modulus
High-density polyethylene
Rate-jump test
Tensile test
Viscoelasticity
Issue Date2010
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polytest
Citation
Polymer Testing, 2010, v. 29 n. 5, p. 558-564 How to Cite?
AbstractIt is demonstrated that, when polyethylene is subject to a tensile test with a jump in the loading rate, an elastic modulus, given as the ratio of the jump in stress rate to the resultant jump in strain rate, is invariant with respect to the magnitude of jump in the loading rate, at a given strain at which the jump is imposed. However, such an elastic modulus measured from rate jumps applied at different strains in the polymer can be different. These observations are consistent with a constitutive description of the mechanical behaviour of the polymer in terms of a network of linear elastic springs and (in general) nonlinear viscous dashpots. During the rate jump, the dashpots are infinitely stiff and do not respond, and the response of the elastic springs in the network gives an overall elastic modulus which is invariant with respect to the magnitude of the rate jump. As the polymer is deformed to different strains, the spring-dashpot network itself may change as a result of evolution of the microstructure, hence the overall elastic modulus describing the collective behaviour of the springs in the network may change. These findings illustrate that an effective elastic modulus can be defined from a spring-dashpot network description of an (in general) nonlinear viscoelastic material, and such a modulus can be measured by a rate-jump test. © 2010 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/75805
ISSN
2015 Impact Factor: 2.35
2015 SCImago Journal Rankings: 0.947
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administration Region, P.R. ChinaHKU7156/08E
Funding Information:

The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administration Region, P.R. China (Project No. HKU7156/08E).

References

 

DC FieldValueLanguage
dc.contributor.authorChan, YLen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:14:44Z-
dc.date.available2010-09-06T07:14:44Z-
dc.date.issued2010en_HK
dc.identifier.citationPolymer Testing, 2010, v. 29 n. 5, p. 558-564en_HK
dc.identifier.issn0142-9418en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75805-
dc.description.abstractIt is demonstrated that, when polyethylene is subject to a tensile test with a jump in the loading rate, an elastic modulus, given as the ratio of the jump in stress rate to the resultant jump in strain rate, is invariant with respect to the magnitude of jump in the loading rate, at a given strain at which the jump is imposed. However, such an elastic modulus measured from rate jumps applied at different strains in the polymer can be different. These observations are consistent with a constitutive description of the mechanical behaviour of the polymer in terms of a network of linear elastic springs and (in general) nonlinear viscous dashpots. During the rate jump, the dashpots are infinitely stiff and do not respond, and the response of the elastic springs in the network gives an overall elastic modulus which is invariant with respect to the magnitude of the rate jump. As the polymer is deformed to different strains, the spring-dashpot network itself may change as a result of evolution of the microstructure, hence the overall elastic modulus describing the collective behaviour of the springs in the network may change. These findings illustrate that an effective elastic modulus can be defined from a spring-dashpot network description of an (in general) nonlinear viscoelastic material, and such a modulus can be measured by a rate-jump test. © 2010 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polytesten_HK
dc.relation.ispartofPolymer Testingen_HK
dc.subjectElastic modulusen_HK
dc.subjectHigh-density polyethyleneen_HK
dc.subjectRate-jump testen_HK
dc.subjectTensile testen_HK
dc.subjectViscoelasticityen_HK
dc.titleInvariant elastic modulus of viscoelastic materials measured by rate-jump testsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0142-9418&volume=29&issue=5&spage=558&epage=564&date=2010&atitle=Invariant+elastic+modulus+of+viscoelastic+materials+measured+by+rate-jump+testsen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.polymertesting.2010.03.015en_HK
dc.identifier.scopuseid_2-s2.0-77955309897en_HK
dc.identifier.hkuros193243en_HK
dc.identifier.hkuros170108en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955309897&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume29en_HK
dc.identifier.issue5en_HK
dc.identifier.spage558en_HK
dc.identifier.epage564en_HK
dc.identifier.isiWOS:000279522000005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChan, YL=8250546500en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.citeulike6969980-

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