Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 2051-2061 |
| Journal | Polymer Composites |
| Volume | 32 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2011 |
| MoE publication type | A1 Journal article-refereed |
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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 journal › Article › Scientific › peer-review
TY - JOUR
T1 - The moisture and temperature effect on mechanical performance of flax/starch composites in quasi-static tension
AU - Spārniņš, E.
AU - Pupurs, A.
AU - Varna, J.
AU - Joffe, R.
AU - Nättinen, Kalle
AU - Lampinen, Johanna
PY - 2011
Y1 - 2011
N2 - 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.
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.
U2 - 10.1002/pc.21184
DO - 10.1002/pc.21184
M3 - Article
VL - 32
SP - 2051
EP - 2061
JO - Polymer Composites
JF - Polymer Composites
SN - 0272-8397
IS - 12
ER -