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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.
difference between piles and pier
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Define the Ignitability - Hazardous Waste - is a liquid with flash point - Not a liquid and capable of spontaneous and sustained combustion under normal conditions - Ign
Q For a curve of 50, apex angle of 900 and transition length of 60m, calculate the parameters for setting out curve by a Theodolite for TTP, mid point of transition, CTP and a p
Cost-volume relationship: Cost-volume relationship is illustrated through a simple example dealing with the cost of operating an automobile. To perform the analysis following
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Question What are the key disparities between epoxy grout cement grout and cement mortar ? Answer Epoxy grout contains of epoxy resin, epoxy hardener and sand or aggregates.
Question What is the sucker deck principle for changeable depth bridge decks ? Answer For a variable depth bridge deck, depth of continuous multi-span bridge deck is greater tha
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