Compressive Strength Prediction of Aa7075/ Sic/Fly Ash/Graphite -Hybrid Metal Matrix Composite

Abstract

The demand for light weight material with superior strength ,lead to many new inventions in the field of metal matrix composites. This need of composite materials are growing at faster rate in almost all Mechanical engineering applications. Components made with Aluminium metal matrix composites (AMMC) are found to be the best replacement for massive metal components and machine parts in various applications. In this context an aluminium composite designated as AA7075 has been taken for the present Investigation. AA7075 has high strength and high corrosion resistance, which has an extensive applications in Air craft, Automotive heat exchangers and widely utilized in Protective cladding due to its excellence corrosion property. The present work is intended at the determination of compression characteristics of AA7075 metal matrix composite by means of traditional analytical method and finite element method as well as. This began with the synthesis of composite material, which includes the reinforcement of alloying elements namely Silicon carbide, fly ash and graphite particulates together in the ratio of 6, 9 and 12 % by weight, with an increment of 1% each every time to pure AA7075 metal. This is accomplished by means of vortex method under stir casting route. Two standard sized specimen (H/D Ratio as 1 and 1.5 ) are fabricated from each of the 3 different compositions mentioned , along with the pure AA7075. The specimen were investigated for the compressive strength and strain behavior by means of Universal testing machine (INSTRON) under no friction condition. The plastic behavior of the specimen were studied as function of various stresses and the same were validated by results obtained from finite element analysis and found to be in good concurrent.