Effects of Silicon Oxide Filler Material and Fibre Orientation on Erosive Wear of GF/EP Composites
Materials added to the matrix help improving operating properties of a composite. This experimental study has targeted to investigate this aim where Silicon Oxide particles were added to glass fibre and epoxy resin at an amount of 15% to the main material to obtain a sort of new composite material. Erosive wear behavior of epoxy-resin dipped composite materials reinforced with glass fibre and Silicon Oxide under three different impingement angles (30°, 60° and 90°), three different impact velocities (23, 34 and 53 m/s), two different angular Aluminum abrasive particle sizes (approximately 200 and 400 μm) and the fibre orientation of 45° (45/-45) were investigated. In the test results, erosion rates were obtained as functions of impingement angles, impact velocities, particle sizes and fibre orientation. Moreover, materials with addition of Silicon Oxide filler material exhibited lower wear as compared to neat materials with no added filler material. In addition, SEM views showing worn out surfaces of the test specimens were scrutinized. Keywords—Erosive wear, fibre orientation, GF/EP, silicon oxide
Erosive wear of composite materials
Abstract The erosive wear behavior of selected polymer matrix composite materials was investigated using an erosion wear tester. Scanning electron microscopy was used to characterize the eroded surface. The results show that the erosive wear rates in these materials are at least an order of magnitude greater than that of low carbon steel. Of the composites tested, continuous graphite fiber-epoxy composites showed erosive wear that is typical of brittle materials (maximum wear rate when the impingement is normal to the surface), while continuous aramid fiber-epoxy and chopped graphite fiber-polyphenylene sulfide showed quasi-ductile behavior (maximum wear rate at 25°–45° impingement angle). These results are discussed in terms of the observed failure modes.
Velocity and size dependences of the erosion rate in silicon
Abstract The results obtained in this investigation for the velocity and size dependences of the steady state erosion rate in silicon single crystals are consistent with the predicted power law relation only if certain modifications are made. The velocity exponent n must depend on the particle size in such a way that n decreases as D increases, and allowance should be made for the onset of an apparent size threshold effect at small particle sizes. Further theoretical work is needed to extend the existing models, taking into account a number of new physical features. Possible mechanism changes and thresholds seem most important in this context. Further systematic experiments are also needed to establish the important parameters and to extract reliably their phenomenological relations. It is pointed out that a cursory analysis of erosion rate data according to simple power law velocity and size dependence is likely to be inconsistent and a suitable range of D and υ values must be systematically analyzed.