Mechanical Damage Characteristics Of
Elementary Hemp Fibers And Scale Effect Of
Fiber Strength
Author(s)
J. Andersons & R. Joffe
Abstract
Ecological and economical considerations foster replacement of man-made fibers
by natural renewable fibers in various industrial applications. Bast fibers of such
plants as, e.g., flax, hemp, jute etc., are particularly attractive as a reinforcement
of polymer-matrix composites due to their high specific stiffness and strength in
the axial direction. The elementary bast fibers exhibit pronounced scatter of
strength. It necessitates probabilistic description of their strength via a
distribution function that reflects damage morphology and severity in fibers.
Fiber fracture is shown to originate from mechanical defects of the bast cell wall,
the most prominent of them being kink bands. While the number of kink bands
in a fiber is easily determined by optical microscopy, direct experimental
measurement of their strength is complicated. Therefore, alternative approaches
are sought, enabling extraction of strength characteristics of the kink bands from
fiber tests via appropriate probabilistic models. Analytical distribution function
of bast fiber strength has been derived, allowing for the effect of mechanical
damage in the form of kink bands. The fiber characteristics measured have been
used to evaluate the kink band density and strength distributions. The theoretical
distribution is verified against experimental tensile strength data of elementary
hemp fibers at several gauge lengths and found to provide acceptable accuracy in
predicting the scale effect of strength.
Keywords: hemp, bast fibers, scale effect, Weibull distribution.
Keywords
hemp, bast fibers, scale effect, Weibull distribution.
Related Book
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