In this study, boron carbide (B 4 C) and silicon carbide (SiC) nanoparticle reinforced aluminum matrix composites (AMC) were fabricated by stir cast method. The morphology of the SiC and B 4 C nanoparticles are analysed by scanning electron microscope (SEM). The Electron probe microanalysis and energy dispersive spectroscopic analysis were employed to confirm the dispersion of nano SiC and B 4 C particles in the aluminum matrix. The abrasion wear behavior of these composite materials was investigated under normal loads of 10 N, 20 N and 30 N. The effect of reinforcing materials on wear behaviour was investigated and the reinforced composites exhibits relatively high wear resistance compared to pure Al6063-T6 alloy. Wear resistance of the B 4 C reinforced AMCs was relatively higher than that of SiC reinforced AMCs at all the applied loads. SEM images of the worn surfaces revealed that micro fracture of the reinforcement composites was the predominant mechanism associated with 3 body abrasion wear. Moreover, SEM images revealed that the debris and detached particle formations are more in the nanoparticle reinforced AMCs. A strong interfacial interactions between Al matrix and SiC nanograin with strong Al-Si bonding is responsible for the high wear resistance. The wear mechanism is varied from abrasive to oxidative by increasing the normal load in all the samples. Moreover, the formation of a condensed spinel structure with the consistent matrix/particle interface bonding provides a substantial particle strengthening effect.
Glass fiber reinforced polymeric (GFRP) composite laminates have been prepared by hand layup method. According to ASTM standard, the test specimens have been prepared to carry out the flexural bending tests. The specimens have been subjected to both cyclic impact load and cyclic gradual load with various frequencies prior to the flexural bending analysis. Three point bend method has been adopted to find out the flexural strength and flexural modulus. Flexural strength and modulus have been calculated from the load deflection curve obtained from the tensometer for respective specimens. The flexural bending properties of GFRP composites subjected to cyclic gradual load and cyclic impact have been compared and found that the GFRP composite materials are effective for gradual cyclic load than the cyclic impact load.
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