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Dynamic-mechanical properties of wood-fibre reinforced polyactide : experimental characterization and micro-mechanical modelling
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- Bogren, Karin M. (author)
- KTH,Hållfasthetslära (Avd.)
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- Gamstedt, E. Kristofer (author)
- KTH,Hållfasthetslära (Avd.)
- Neagu, R. Cristian (author)
- show more...
- Åkerholm, Margaretha (author)
- show less...
- KTH Hållfasthetslära (Avd) (creator_code:org_t)
- 2016-08-19
- 2006
- English.
- In: Journal of Thermoplastic Composite Materials. - : SAGE Publications. - 0892-7057 .- 1530-7980. ; 19:6, s. 613-638
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Wood-fiber reinforced polylactide is a biodegradable compositewhere both fibers and matrix are from renewableresources. When designing new materials of this kind, itis useful to measure the influence of fiber–matrixinterface properties on macroscopic mechanicalproperties. In particular, a quantitative measure of thedynamic stress transfer between the fibers andthe matrix when the material is subjected tocyclic loading would simplify the development of wood-fibercomposites. This is obtained by comparing themechanical dissipation of the composite with avalue predicted by a viscoelastic micromechanical model basedon perfect interfacial stress transfer. Theloss factors predicted by the model are 0.12 and 0.16 at dryand humid conditions, respectively, which amountto 63 and 66% of the experimentally determinedvalues. For Young's moduli the predicted values are 1.01 and0.88 GPa, which correspond to 92% of the experimentallydetermined values. The mismatch between thepredicted and experimental values may be attributed toimperfect interfaces with restrained stress transfer.Loss factors are also determined for specificmolecular bonds using dynamic Fourier transform infrared(FT-IR) spectroscopy. These values show the sametrends with regard to moisture content as themacroscopically determined loss factors.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Keyword
- polylactide • wood fibers • micromechanics • stress transfer • imperfect interfaces • dynamic FT–IR
- Engineering mechanics
- Teknisk mekanik
Publication and Content Type
- ref (subject category)
- art (subject category)
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