The effect of mechanical defects on the strength distribution of elementary flax fibres

Andersons, J.; Poriķe, E.; Spārniņš, E.

doi:10.1016/j.compscitech.2009.05.010

Cited by 59 publications

(57 citation statements)

References 26 publications

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“…(7) and (8) For comparison, kink band spacing and strength parameters, evaluated for elementary flax fibers by the procedure described above, are presented in table 2. One can see that the hemp fibers studied differ from those considered in [18,20] in that their kink band strength is significantly lower at a rather high linear density, which results in a relatively low fiber strength. Since kink bands develop not only during growth but also in processing of the fibers, fiber strength can be increased by optimizing the latter.…”

Section: Resultsmentioning

confidence: 95%

“…The rest of distribution eqn. (5) parameters are related to those of kink band strength and spacing distributions as specified in [18,20,23]. The length exponent γ is found to depend only on the scatter of the kink band spacing among fibers, characterized by the shape parameter m of the distribution eqn.…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

“…If fiber failure at a kink band and due to failure in the intact part of the fiber may be considered as independent events, the probability of fiber failure is given by [20][21]:…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

“…Then, taking into account the random number of defects in eqn. (2), one arrives at the fiber strength given by the modified Weibull distribution [18,20,23]:…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 95%

Section: Fiber Strength Distributionmentioning

confidence: 99%

“…If fiber failure at a kink band and due to failure in the intact part of the fiber may be considered as independent events, the probability of fiber failure is given by [20][21]:…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

“…Then, taking into account the random number of defects in eqn. (2), one arrives at the fiber strength given by the modified Weibull distribution [18,20,23]:…”

Section: Fiber Strength Distributionmentioning

confidence: 99%

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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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“…However, for natural plant fibers, such as the flax fiber, complete sets of such basic data are not available to the best of the authors' knowledge. Longitudinal tensile strength and modulus of flax fibers are available [Andersons et al, 2009;Zeng et al, 2015;Lamon et al, 2016]. However, complete set of properties of natural plant fibers is not reported yet.…”

Section: Review Of Techniques For Simulation and Existing Challengesmentioning

confidence: 99%

Natural Plant Fiber Composites-Constituent Properties and Challenges in Numerical Modeling and Simulations

Zhong

Kureemun

Tran

et al. 2017

Int. J. Appl. Mechanics

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Natural fibers are extracted from natural resources such as stems of plants. In contrast to synthetic fibers (e.g., carbon fibers), natural fibers are from renewable resources and are eco-friendlier. Plant fibers are important members of natural fibers. Review papers discussing the microstructures, performances and applications of natural plant fiber composites are available in the literature. However, there are relatively fewer review reports focusing on the modeling of the mechanical properties of plant fiber composites. The microstructures and mechanical behavior of plant fiber composites are briefly introduced by highlighting their characteristics that need to be considered prior to modeling. Numerical works that have already been carried out are discussed and summarized. Unlike synthetic fibers, natural plant fiber composites have not received sufficient attention in terms of numerical simulations. Existing technical challenges in this subject are summarized to provide potential opportunities for future research.

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Advances in Polymer Composites: Biocomposites–State of the Art, New Challenges, and Opportunities

Goda

Sreekala²,

Malhotra³

et al. 2013

Polymer Composites

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The effect of mechanical defects on the strength distribution of elementary flax fibres

Cited by 59 publications

References 26 publications

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

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

Natural Plant Fiber Composites-Constituent Properties and Challenges in Numerical Modeling and Simulations

Advances in Polymer Composites: Biocomposites–State of the Art, New Challenges, and Opportunities

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