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Nonlinear viscoplastic and nonlinear viscoelastic material model for paper fiber composites in compression
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0001-9649-8621
2006 (engelsk)Inngår i: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 37, nr 2, s. 344-355Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Compressive behavior of phenol-formaldehyde impregnated paper composites is studied in creep and strain recovery tests observing large nonlinear viscoelastic strains and irreversible strains, describing the latter as viscoplasticity. Stiffness reduction was not observed in experiments and therefore is not included in the material model. Schapery's nonlinear viscoelastic and nonlinear viscoplastic constitutive law is used as a material model and the stress dependent non-linearity functions are determined. First, the time and stress dependence of viscoplastic strains is described by Zapas et al. model and identified measuring the irreversible strains after creep tests of different length at the same stress and doing the same for creep tests of a fixed length but at different stress. Then, the determination of nonlinear viscoelastic stress dependent parameters is performed.

sted, utgiver, år, opplag, sider
2006. Vol. 37, nr 2, s. 344-355
HSV kategori
Forskningsprogram
Polymera konstruktionsmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-13496DOI: 10.1016/j.compositesa.2005.02.015ISI: 000235931100020Scopus ID: 2-s2.0-32344446316Lokal ID: cb717f80-a563-11db-9811-000ea68e967bOAI: oai:DiVA.org:ltu-13496DiVA, id: diva2:986449
Merknad
Validerad; 2006; 20070116 (ysko)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Nordin, Lars-OlofVarna, Janis

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