Modeling the effect of reinforcement discontinuity on the tensile strength of UD flax fiber composites
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To exploit the potential of natural fibers as reinforcement of polymer matrix composites, aligned bast fiber composite materials are being produced and studied. Bast fiber reinforcement is discontinuous due to the limited length of natural fibers, which needs to be reflected in predictive models of mechanical properties of composites. The strength in tension in the fiber direction of an aligned flax fiber-reinforced composite is modeled assuming that a cluster of adjacent fiber discontinuities is the origin of fracture. A probabilistic model of tensile strength, developed for UD composites containing a microdefect, is applied. It follows from the theoretical analysis that the experimental tensile strength as a function the fiber volume fraction can be described with acceptable accuracy assuming the presence of a cluster of ca. 4 × 4 elementary fiber discontinuities.
KeywordsFiber Volume Fraction Fiber Strength Strength Distribution Flax Fiber Bast Fiber
E. Spārniņš and J. Andersons acknowledge funding by ESF via project 2009/0209/1DP/184.108.40.206.0/09/APIA/VIAA/114. J. Andersons gratefully acknowledges the support by the DAAD which provided the opportunity for a research stay at the Institute of General Mechanics of the RWTH Aachen University. Authors are thankful to Mr. Alann Andre for help with manufacturing of samples and experimental work.
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