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QuestionWhy Poly tetra fluoro ethylene (PTFE) is usually used in sliding bearings? AnswerThe choice of sliding surface of bearings is of very important importance since sliding surfaces generate frictional forces that are exerted on bearings and substructure of bridge. For example, PTFE and lubricated bronze are usually choices of sliding surfaces for bearings. PTFE is fluro carbon polymer which possesses high-quality chemical resistance and be able to function in wide range of temperature. On whole significant characteristic of this material is its low coefficient of friction. PTFE has slightest possible coefficients of static and dynamic friction of any solid with absence of stick-slip movement by David J. Lee. The coefficient of friction is established to decrease with add to in compressive stress. However, PTFE contain some demerits like high thermal development and low compressive strength. In designing complementary contact plate with PTFE sliding surface, stainless steel plates are in general selected where plates have to be larger than PTFE surface to let movement without exposing PTFE. Moreover, it is recommended that stainless steel surface be located on top of PTFE surface to avoid contamination of dirt and rubbish. Lubricants are now and then introduced to decrease friction between PTFE surface and upper stainless steel plate. Hence, PTFE might be designed with dimples to keep away from lubricant from squeezing out under repeated conversion movements.
Plants aeration period: Problem: What is the plant's aeration period? Solution The plant's aeration period is the number of hours that the wastewater is aerated
Classification Based on Grading: IS 883-1970 classifies the structural timber into 3 grades-select grade, grade I and grade II. The classification is depend on, defects, permi
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High strength friction grip (HSFG) bolts vs. normal bolts HSFG bolts have the following benefits when compared with normal bolts: (i) Performance of preloaded HSFG bolts u
Poisson distribution function: Let X I , X 2 , ..., X,& b e n independently and identically distributed random variables each having the same cdf F ( x ). What is the pdf of t
Define the In-depth inspections for Bridge? In-depth inspection is a detailed inspection of one or more members below the water level to detect any deficiencies not readily app
(i) A dry soil has a void ratio of 0.65 and its grain exact gravity is = 2.80. What is its unit weight? (ii) Water is added to the sample so that its degree of saturation is 60%
Write some appplications of lagrange''s mean value thorem
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