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1.
G. Bakradze J. Kajaks S. Reihmane R. Krutohvostov V. Bulmanis 《Mechanics of Composite Materials》2007,43(6):573-578
The effect of water on the mechanical properties (tensile modulus, ultimate tensile strength, tensile strain, and specific
work at break) of both chemically treated and untreated composites based on a recycled low-density polyethylene and linen
yarn production waste is analyzed. It is found that three water sorption-desorption cycles change the tensile properties of
both the materials irreversibly. This effect is considered as the result of partial fracture of the fiber-matrix interface.
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 43, No. 6, pp. 839–848, November–December, 2007. 相似文献
2.
G. G. Bakradze J. A. Kajaks S. A. Reihmane J. E. Lejnieks 《Mechanics of Composite Materials》2007,43(5):427-432
The effect of the amount of sorbed water on the mechanical properties (tensile modulus, tensile strength, unit work of fracture,
and characteristic strains) of composites based on a recycled low-density polyethylene, both unmodified and modified with
diphenylmethane diisocyanate (DIC), is an a lyzed by statistical methods. The results of tensile tests are found to depend
on the amount of sorbed water considerably. The elastic modulus, the unit work of fracture, and the characteristic strains
correlate linearly with the amount of water. It is found that the elastic modulus drops after the sorption of water, but then,
during the desorption process, it is restored gradually and reaches its initial value after a 30-day drying. This is explained
by the plasticizing effect of water on composite materials containing hydrophilic natural fibers. DIC improves the interfacial
interaction of the fiber-matrix interface and slows down the desorption of water. The investigations of the main deformational
and strength characteristics of the unmodified and modified systems showed that the ad verse effect of water completely disappeared
after a 30-day drying. The same conclusion, with a 95% probability, can be drawn from the results of an analysis of variance
(ANOVA).
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 43, No. 5, pp. 626–638, September–October, 2007. 相似文献