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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.
Manhole covers - triangular halves Manhole covers are usually made up of two pieces of triangular plates to form a square cover. One can wonder why two rectangular halves are u
Sight Distance: Sight distance is the distance along a road at which a driver has a visibility of objects and can safely stop his vehicle or overtake another vehicle. Sto
Q. Describe types of Spurs? Spurs can be of varied types. They may be either permeable or impermeable. Permeable spurs are open structures constructed by driving wooden balties
Draw a parabola , height 40mm and bass 120mm using offset method
Calculation of deformation For calculation of deformation at some stage before the total creep is reached, it may be assumed that about half the total creep takes place in f
Q. What is the minimum prescribed track structure for LWR / CWR on Broad Gauge? Ans.- 1. General - The minimum length of LWR depends upon - i. Range of temporary variati
A masonry wall with vertical back has a backfill 5 m behind it. The ground level is horizontal at the top and the ground water table is at ground level. Measured the horizontal pre
Question In designig of watermains, how to decide usage of double air valves and single air valves ? Answer Single air control device let squeezing air out of p
need help for assignment that requires strand 7 and autocad
The transmission main from the well field to the community is 2500 ft, the velocity of flow at peak pumping capacity is 3.5 fps, water temperature is 10oC, and pH is 7.5. If free c
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