Time-dependent behavior of flax/starch composites

The time-dependent mechanical response of flax fiber-reinforced thermoplastic starch matrix composite and neat starch is analyzed. It is demonstrated that the response is highly sensitive to the relative humidity (with specific saturation moisture content in the composite) and special effort has to...

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Bibliographic Details
Published inMechanics of time-dependent materials Vol. 16; no. 1; pp. 47 - 70
Main Authors Varna, J., Spārniņš, E., Joffe, R., Nättinen, K., Lampinen, J.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 2012
Subjects
Characterization and Evaluation of Materials
Classical Mechanics
Engineering
Polymer Sciences
Polymera konstruktionsmaterial
Polymeric Composite Materials
Solid Mechanics
Material modeling
Natural fiber composite
Strain recovery
Creep
Viscoplasticity
Nonlinear viscoelasticity
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Summary:The time-dependent mechanical response of flax fiber-reinforced thermoplastic starch matrix composite and neat starch is analyzed. It is demonstrated that the response is highly sensitive to the relative humidity (with specific saturation moisture content in the composite) and special effort has to be made to keep it constant. It was found that the accumulation of micro-damage and the resulting reduction of the elastic modulus in this type of composite is limited. The highly nonlinear behavior of composites is related to the nonlinear viscoelasticity and viscoplasticity. These phenomena are accounted for by simple material models, as suggested in this study. The stress-dependent nonlinearity descriptors in these models are determined in creep and strain recovery tests at low as well as by high stresses.
ISSN:1385-2000
1573-2738
1573-2738
DOI:10.1007/s11043-011-9156-7