Diameter variability and strength scatter of elementary flax fibers

Spārniņš, E.; Andersons, J.

doi:10.1007/s10853-009-3785-0

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…For natural fibres, Spā rnin ßš and Andersons [5] studied the diameter variation and strength scatter for flax fibres and noted that the variation of diameter becomes significant when the coefficient of variation (CoV) for diameter exceeds 0.15 of the CoV for fibre strength. The Coefficient of Variation measures the scatter of the data points in a data set about their mean.…”

Section: Introductionmentioning

confidence: 99%

Failure strain as the key design criterion for fracture of natural fibre composites

Virk

Hall

Summerscales

2010

Composites Science and Technology

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Section: Introductionmentioning

confidence: 99%

Failure strain as the key design criterion for fracture of natural fibre composites

Virk

Hall

Summerscales

2010

Composites Science and Technology

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“…It is also affected by the variability of fiber diameter, as discussed in refs. [22,25]. However, in the presence of macroscopic damage, failure at kink bands is likely to be the dominant fracture mechanism of bast fibers [22], thus eqn (1) should reduce to the strength distribution given by eqn (5).…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

Modeling the tensile strength of hemp fibers and short-hemp-fiber reinforced composites

Joffe¹,

Andersons²

2015

Natural Filler and Fibre Composites

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Ecological and economical considerations foster replacement of man-made fibers by natural renewable fibers in various industrial applications. Proper description of the scale effect of fiber strength is important for theoretical estimation of the load-carrying capacity of their products. Bast fibers of such plants as, e.g., flax, hemp and jute, are particularly attractive as reinforcement in polymer-matrix composites due to their high specific stiffness and strength. The elementary bast fibers exhibit pronounced strength scatter. This necessitates a 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. An analytical distribution function of bast fiber strength has been derived, allowing for the effect of mechanical damage in the form of kink bands. 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. The fiber characteristics measured have been used to evaluate the kink band density and strength distributions. The fiber strength distribution is applied for predicting the tensile strength of short-fiber-reinforced composites.

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“…It is also affected by the variability of fiber diameter, as discussed in [21,24]. However, in the presence of macroscopic damage, failure at kink bands is likely to be the dominant fracture mechanism of bast fibers [21], thus eqn.…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

Mechanical damage characteristics of elementary hemp fibers and scale effect of fiber strength

Andersons¹,

Joffe²

2012

WIT Transactions on the Built Environment

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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. , , ,High Performance Structure and Materials VI 157

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Diameter variability and strength scatter of elementary flax fibers

Cited by 12 publications

References 22 publications

Failure strain as the key design criterion for fracture of natural fibre composites

Failure strain as the key design criterion for fracture of natural fibre composites

Modeling the tensile strength of hemp fibers and short-hemp-fiber reinforced composites

Mechanical damage characteristics of elementary hemp fibers and scale effect of fiber strength

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