Materials and Surface Engineering Essay Example | Topics and Well Written Essays - 1250 words

Materials and Surface Engineering - Essay ExampleTherefore, the mating egresss should be accessible so that the lubricant can be applied at regular intervals. However, in many cases, the mating surfaces may be in radioactive or toxic z angiotensin converting enzyme or may be inaccessible due to design considerations. In such cases on can non depend on liquid lubricants.At high load and low go the liquid lubricant film is not thick enough to ensure effective separation of the mating surfaces and therefore, frictional force and wear loss increases. Therefore, one cannot rely on liquid lubricants under such operating conditions.Liquid lubricants are not good for high temperature applications as viscosity decreases with increasing temperature and blues may also be produced at higher temperature. Therefore, liquid lubricants are not suitable for application at higher temperatures.Liquid lubricants are not clean in itself in the sense that it gets spread on the workplace and also dirt and dust gets adhered to it deteriorating the cleanliness of the workplace further. Therefore, liquid lubricants are not favourite(a) for clean applications.Q6. A steel ball of elastic modulus E1 and Poissons ratio 1 (figure, below) is pressing with load P onto a flat metallic surface of aluminum plate having elastic modulus E2 and Poissons ratio 2 and hardness H.(d) This equation gives a much larger nurture for the volume of wear than what is by experimentation observed or what is observed in real life. The difference is very high and is 4 to 7 order of magnitude higher than that observed in the experiments. This is because not all but only a very small fraction of the asperity contacts result in wear of the material and therefore, in emplacement of the equality sign in the Archards wear equation, there should be a proportionality sign. When this is done a constant is introduced in the equation whose value is determined experimentally. Thus the revised equation