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Nonlinear viscoelastic viscoplastic material model including stiffness degradation for hemp/lignin composites
RISE, Swerea, Swerea SICOMP.
Luleå University of Technology.
Luleå University of Technology.
2008 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 68, no 9, p. 2156-2162Article in journal (Refereed)
Abstract [en]

In repeating tensile tests with increasing maximum strain for every loading cycle the hemp/lignin composites clearly showed a nonlinear behavior and hysteresis loops in loading and unloading. The explanation for this behavior is the inherent viscoelastic nature for this type of material, but also noticeable stiffness degradation with increasing strain level. Creep tests performed at different stress levels revealed a nonlinear viscoelastic response and after recovery viscoplastic strain was detected for high stress levels. It is demonstrated that Schapery's model is suitable to model nonlinear viscoelasticity whereas viscoplastic strain may be described by a nonlinear functional presented by Zapas and Crissman. In a creep test this functional leads to a power law with respect to time and stress. In order to include stiffness reduction due to damage Schapery's model has been modified by incorporating a maximum strain-state dependent function reflecting the elastic modulus reduction with increasing strain measured in tensile tests. A generalized incremental model of the constitutive equation for viscoelastic case has been used to validate the developed material model in a linear stress controlled loading and unloading ramp. The model successfully describes the main features for the investigated material and shows good agreement with test data within the considered stress range. © 2008 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 68, no 9, p. 2156-2162
Keywords [en]
A. Polymer-matrix composites, B. Creep, B. Nonlinear behavior, C. Modeling, Viscoelasticity
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13188DOI: 10.1016/j.compscitech.2008.03.011OAI: oai:DiVA.org:ri-13188DiVA, id: diva2:973384
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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