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Eoghan Thornton,Pouyan Ghabezi,Calvin Ralph,Findhan Strain,Noel M Harrison 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
In this work, the suitability of basalt fibres for uni-directional composite material applications, and adhesionbetween the fibres and the matrix they are embedded in have been investigated. A single fibre fragmentation test was carriedout on 13 μm diameter basalt fibres embedded in a dog-bone epoxy matrix. Photoelastic analysis was used to observedifferent fracture mechanisms in a single fibre composite sample and fibre breaks during testing. A theoretical model basedon a Griffith’s fracture mechanics approach was used to determine the fibre-matrix interfacial shear strength, which is ameasurement of the level of adhesion between the fibre and the matrix. It was also used to predict the fibre fragment axialstress and the fragment interfacial shear stress, both as functions of axial position on the fibre. A finite element model wasdeveloped to simulate the fibre fracture process, and the redistribution of stresses in the fibre and the local region surroundinga fibre break. The developed experimental procedure was successful in that stress-induced birefringence was observed in thetested samples, as well as the characteristic shear stress light fringes that occur in the regions surrounding fibre fractures. Also, there were some similarities between the finite element model results and the theoretical predictions. The critical fibrelength, lc was measured as 0.752 mm, whereas this value was calculated 0.6708 mm from finite element predicted interfacialshear stress distribution for fibre fragment. A combination of all three types of failure modes was recorded across the samplesthat were tested, while only a single failure mode was observed in the finite element model. According to the theoreticalmodel, for a given set of parameters and constant stress with only the fibre length varying, the axial stress in the fibre reducesas the fibre gets smaller.
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