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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.
According to National Building Code (Sp:7 1970), the differential settlement shall be kept within the limits to which the superstructure can accommodate itself without harmful dist
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what is the procedure for gsb proctor test for matrial sampling for lab density
Explain a Critical Path The series of activities which determines the earliest possible date of project completion Usually defined as those activities with minimal or
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Q. Corner reinforcement for concrete pavement? Let's consider a panel of concrete slab without any load transferring devices at it edges. When concrete panel is subjected to tr
first of all i want to think you for this helpful website , and let me ask you this question . how to calculate w/c ratio ? thank you so much for you .
State the use of reinforced concrete The use of reinforced concrete may not solve all the problems. For example, a very long reinforced concrete member, which may be subjected
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