The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension

E. Spārniņš, A. Pupurs, J. Varna, R. Joffe (Corresponding Author), Kalle Nättinen, Johanna Lampinen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The effect of temperature and moisture on mechanical behavior of flax fiber/starch based composites was investigated experimentally. Elastic modulus, the nonlinear tensile loading curves, and failure strain were analyzed. Neat matrix and composites with 20 and 40% weight content of fibers were tested. It was found, performing tests with different amplitudes, that microdamage development with stress is rather limited and the related elastic modulus reduction in this type of composites is not significant. It was shown that the composite elastic modulus and failure stress are linearly related to the maximum tensile stress in resin. The sensitivity of the maximum stress of the resin with respect to temperature and moisture is the source of composites sensitivity to these parameters. Constant interface stress shear lag model for stress transfer assuming matrix yielding at the fiber/matrix interface has been successfully used to explain the tensile test data. It indicates that the sensitivity of the used composite with respect to the matrix properties change could be significantly reduced by increasing the average fiber length from 0.9 mm to 1.5 mm.
Original languageEnglish
Pages (from-to)2051-2061
JournalPolymer Composites
Volume32
Issue number12
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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Flax
Starch
Thermal effects
Moisture
Composite materials
Fibers
Elastic moduli
Resins
Tensile stress
Shear stress
Temperature

Cite this

Spārniņš, E., Pupurs, A., Varna, J., Joffe, R., Nättinen, K., & Lampinen, J. (2011). The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension. Polymer Composites, 32(12), 2051-2061. https://doi.org/10.1002/pc.21184
Spārniņš, E. ; Pupurs, A. ; Varna, J. ; Joffe, R. ; Nättinen, Kalle ; Lampinen, Johanna. / The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension. In: Polymer Composites. 2011 ; Vol. 32, No. 12. pp. 2051-2061.
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Spārniņš, E, Pupurs, A, Varna, J, Joffe, R, Nättinen, K & Lampinen, J 2011, 'The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension', Polymer Composites, vol. 32, no. 12, pp. 2051-2061. https://doi.org/10.1002/pc.21184

The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension. / Spārniņš, E.; Pupurs, A.; Varna, J.; Joffe, R. (Corresponding Author); Nättinen, Kalle; Lampinen, Johanna.

In: Polymer Composites, Vol. 32, No. 12, 2011, p. 2051-2061.

Research output: Contribution to journalArticleScientificpeer-review

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AB - The effect of temperature and moisture on mechanical behavior of flax fiber/starch based composites was investigated experimentally. Elastic modulus, the nonlinear tensile loading curves, and failure strain were analyzed. Neat matrix and composites with 20 and 40% weight content of fibers were tested. It was found, performing tests with different amplitudes, that microdamage development with stress is rather limited and the related elastic modulus reduction in this type of composites is not significant. It was shown that the composite elastic modulus and failure stress are linearly related to the maximum tensile stress in resin. The sensitivity of the maximum stress of the resin with respect to temperature and moisture is the source of composites sensitivity to these parameters. Constant interface stress shear lag model for stress transfer assuming matrix yielding at the fiber/matrix interface has been successfully used to explain the tensile test data. It indicates that the sensitivity of the used composite with respect to the matrix properties change could be significantly reduced by increasing the average fiber length from 0.9 mm to 1.5 mm.

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