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

Materials and Surface Engineering - Essay ExampleTherefore, the mating surfaces should be accessible so that the lubricator can be applied at regular intervals. However, in many cases, the mating surfaces may be in radioactive or toxic zone or may be inaccessible cod to design considerations. In such cases on cannot depend on luculent lubricants.At juicy tear and low speed the liquid lubricant film is not thick enough to ensure utile 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 atomic number 18 not good for high temperature applications as viscosity decreases with increasing temperature and vapors 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 dus t gets adhered to it deteriorating the cleanliness of the workplace further. Therefore, liquid lubricants are not preferred for clean applications.Q6. A steel ball of tractile 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 value for the the great unwashed of wear than what is experimentally 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 entirely only a very small fraction of the asperity contacts result in wear of the genuine and therefore, in stead 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 rewrite equation