Apparent interfacial shear strength of short-flax-fiber/starch acetate composites

J. Andersons, J. Modniks, R. Joffe, Bo Madsen, K. Nättinen

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    The paper deals with an indirect industry-friendly method for identification of the interfacial shear strength (IFSS) in a fully bio-based composite. The IFSS of flax fiber/starch acetate is evaluated by a modified Bowyer and Bader method based on an analysis of the stress-strain curve of a short-fiber-reinforced composite in tension. A shear lag model is developed for the tensile stress-strain response of short-fiber-reinforced composites allowing for an elastic-perfectly plastic stress transfer. Composites with different fiber volume fractions and a variable content of plasticizer have been analyzed. The apparent IFSS of flax/starch acetate is within the range of 5.5-20.5 MPa, depending on composition of the material. The IFSS is found to be greater for composites with a higher fiber loading and to decrease with increasing content of plasticizer. The IFSS is equal or greater than the yield strength of the neat polymer, suggesting good adhesion, as expected for the chemically compatible constituents.
    Original languageEnglish
    JournalInternational Journal of Adhesion and Adhesives
    Pages (from-to)78-85
    Number of pages8
    Publication statusPublished - 2016


    • Chemical Engineering (all)
    • Biomaterials
    • Polymers and Plastics
    • Flax fiber
    • Green composite
    • Interfacial shear strength
    • Thermoplastic starch
    • Fiber reinforced plastics
    • Flax
    • Linen
    • Plasticizers
    • Reinforced plastics
    • Reinforcement
    • Sheet molding compounds
    • Stress-strain curves
    • Yarn
    • Apparent interfacial shear strength
    • Elastic perfectly plastic
    • Fiber volume fractions
    • Green composites
    • Short-fiber-reinforced composites
    • Fibers


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