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Experimental studies and Monte Carlo simulations have been conducted to investigate the percolation phenomenon in injection-molded short-fiber composites. The electrical resistivity and the percolation thresholds of the short-carbon-fiber-reinforced Nylon 6.6 composites were characterized in the...
Composites were fabricated by infiltrating discontinuous alumina fibre (Saffil) preforms (V f = 0.08 and 0.25) with Al-Cu-Mg-Ag alloys at two different magnesium levels. In each composite, the preform binder, an aluminosilicate, reacted with the matrix magnesium to form MgO and alumina. Some...
The single-fibre fragmentation test has received attention as a preliminary test for studying interfacial properties in composite materials. Its merit as a powerful tool for measuring interfacial bonding at the fibre/matrix interface is not in doubt. ‘Simplistic’ assumptions generally used...
The proportion of fracture energy which is consumed by fibres during fracturing in uniaxial and biaxial loading of a composite (matrix plus fibre) can be calculated by means of a modified model. By the method of variation of parameters, the calculated load/displacement curve is adapted to the...
The fracture behavior of boron nitride (BN) composites reinforced with several types of carbon and ceramic fibers has been examined. Fiber properties and fiber/matrix interface characteristics were found to control the mechanical strength and toughness of the composites. Transmission electron...
In conventional injection moulding of short-fibrere-inforced polymer-, ceramic- or metal-matrix composites, fibres tend to align in the flow direction near the surface but to present anisotropic orientation near the centre. This diminishes the fibre reinforcing effect and, in matrices which...
Polypropylene-fibre-reinforced concretes (FRC) with different fibre lengths and fibre contents were tested under uniaxial tensile stress and biaxial (combined tension compression) stress. The tests were carried out on notched cube samples in a wedge splitting test jig that could be varied such...
Samples of several fibre-reinforced epoxies and fibre-reinforced PEEK were exposed to steam. The moisture absorption characteristics, longitudinal shear modulus and loss factor, and the interlaminar shear strength were monitored, with a view to assessing the feasibility of the use of dynamic...
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