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Nonlinear viscoelastic behavior of paper fiber composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2005 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 65, no 10, p. 1609-1625Article in journal (Refereed) Published
Abstract [en]

Anisotropic material model for composites made from phenol-formaldehyde impregnated paper is developed starting from Schapery's nonlinear viscoelastic and nonlinear viscoplastic constitutive law derived from thermodynamics. Methodology for determination of the included stress-dependent functions has been developed and used to determine properties of two composites in two directions related to material symmetry. Creep with following strain recovery tests have been performed at several levels of stress. Data reduction is based on two-step load application methodology to include effect of finite time of load increase to the plateau value and its removal. No stiffness reducing micro damage was detected and the plastic deformations were considered negligible or accounted for in a simplified manner. The material model was used to simulate a constant stress rate loading and unloading test. Model is validated comparing simulations with results from test.

Place, publisher, year, edition, pages
2005. Vol. 65, no 10, p. 1609-1625
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-5479DOI: 10.1016/j.compscitech.2005.02.007ISI: 000229824500015Scopus ID: 2-s2.0-18844446708Local ID: 397d0230-a567-11db-9811-000ea68e967bOAI: oai:DiVA.org:ltu-5479DiVA, id: diva2:978353
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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