By Nanjappan Natarajan, Vijayan Krishnaraj, Visit Amazon's J. Paulo Davim Page, search results, Learn about Author Central, J. Paulo Davim,
This e-book is devoted to composite fabrics, offering assorted synthesis techniques, composite houses and their machining behaviour. The booklet describes additionally the issues on production of steel matrix composite parts. between others, it offers systems for production of steel matrix composites and case studies.
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Extra info for Metal Matrix Composites: Synthesis, Wear Characteristics, Machinability Study of MMC Brake Drum
The frictional force is due to the force of adhesion and deformation. The adhesion is because of Van der Waals forces, dipole interactions, hydrogen bonding and electric charges. The force of deformation is due to polymer asperities, loss of energy due to hysteresis and grooving by the counterface. The friction coefficient depends on material properties like hardness, yield strength, microstructure and surface finish. Liu (1980) has investigated that the frictional force during sliding, is to be the power function of applied load and sliding velocity at a particular temperature as F ¼ lðTÞPaðTÞ V bðTÞ ð5:1Þ where F is the frictional force in Newtons, l(T) is the friction coefficient at temperature T, P is the applied load in Newtons, V is the sliding velocity in metres per second, a(T) is the load factor at temperature (T) and b(T) is the velocity factor at temperature (T).
11 show’s the brake drum assembly. 5 Summary 33 SiCp Stirrer Electrical Resistance Furnace Fig. 9 Manufacturing set-up Fig. 5 Summary A dispersion casting set-up has been fabricated to manufacture the MMC brake drum. The MMC brake drum has been manufactured by using this casting set-up. The cast MMC brake drum is then machined to the required size using a conventional lathe machine using a diamond tipped tool. A specimen from the same lot is subjected to optical microscopy to ensure the uniform distribution of the reinforcement in the matrix.
The wear tests have been carried out on a pin on disc machine, using pin as brake shoe lining material and discs as A356/25SiCp Al MMC and grey cast iron materials. Pins of 10 mm diameter have been machined from a brake shoe lining of a commercial passenger car. The grey cast iron disc has been machined from a brake drum of a commercial passenger car. The Al MMC disc has been manufactured by dispersion casting technique and machined to the required size. The friction and the wear behaviour of Al MMC, grey cast iron and the brake shoe lining have been investigated at different sliding velocities, loads and sliding distances.