01-11-2014, 03:26 PM
Abstracts: A brake is a device by means of which artificial frictional resistance is applied to moving machine member, in order to stop the motion of a machine. In the process of performing this function, the brakes absorb either kinetic energy of the moving member or the potential energy given up by objects being lowered by hoists, elevators etc. The energy absorbed by brakes is dissipated in the form of heat. Disc brake is familiar automotive application where they are used extensively for car and motorcycle wheels. This is sandwiched between two pads actuated by pistons supported in a caliper mounted on the stud shaft. When the brake lever is pressed hydraulically pressurized fluid is forced into the cylinders pushing the opposing pistons and brake pads into frictional contact with the disc Friction brakes act by generating frictional forces as two or more surfaces rub against each other. The stopping power or capacity of a friction brake depends on the area in contact and coefficient of friction of the working surfaces as well as on the actuation pressure applied. Wear occurs on the working surfaces, and the durability of a given brake (or service life between maintenance) depends on the type of friction material used for the replaceable surfaces of the brake. If drake disc are in solid body the Heat transfer rate is low. Time taken for cooling the disc is low. If brake disc are in solid body, the area of contact between Disc and Pads are more, so efficiency of brake is high. We introduced superimpose variation cut pattern on the disc in disc brake. The number of cuts Pattern introduce in disc The Heat transfer rate is increase. Time taken for cooling the disc is high. If the number of cut is increase in the disc, the area of contract between the disc and pads were reduces, so efficiency of brake is high. The number of cut was increase the strength of the disc also reduces. So it can easily break. So the number of cuts in the disc with in the limit, it can help to heat transfer from the disc.