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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.
Surface Dressing: Surface dressing is an application of a thin film of bituminous binder followed by a coat of aggregates of single size, rolled into position. Surface dressi
Types of Cement In addition to ordinary Portland cement there are various varieties of cement. Significant varieties are briefly explained below: (i) White Cement: The ce
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Define the Design of Piers and Abutments Erected in Water? All piers and abutments erected in water are generally designed to be protected from scour or erosion. However, both
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What are the functions of a column in a building? Ans) A column is used to handle the weight of the roof and/or the upper floors. Now days, many columns are used for decorative
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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
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