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Methodology for parameter identification in nonlinear viscoelastic material model
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2005 (English)In: Mechanics of time-dependant materials, ISSN 1385-2000, E-ISSN 1573-2738, Vol. 9, no 4, p. 259-280Article in journal (Refereed) Published
Abstract [en]

Two methodologies for identification of material functions in Schapery's nonlinear viscoelastic material model are compared in context to their ability to deal with deviations from Heaviside stepwise load application and unloading in real test conditions where the time intervals for load increase to plateau value and to unloading to zero are finite. In the first method the description of the whole loading, creep, unloading and recovery process is given by one-step load application and one-step unloading whereas in the second method the load increase and decrease intervals are approximated by two-step load application with 0.5 of the load applied in the increase region. Vinyl ester with known viscoelastic properties and incremental form of Schapery's constitutive equation is used to simulate "experimental data" for several length of load application and unloading. The two data reduction methodologies are applied to these "data" and the accuracy of identified material functions is compared with the true values (input data).

Place, publisher, year, edition, pages
2005. Vol. 9, no 4, p. 259-280
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-6820DOI: 10.1007/s11043-005-9000-zISI: 000238138500004Scopus ID: 2-s2.0-33744958910Local ID: 51e22790-a564-11db-9811-000ea68e967bOAI: oai:DiVA.org:ltu-6820DiVA, id: diva2:979706
Note
Validerad; 2005; 20070116 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Nordin, Lars-OlofVarna, Janis

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