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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.
what is reciprocal method?
Carbonate Hardness (CH) - Water Softening Ca +2 , Mg +2 combining with alkalinity (OH - , CO 3 -2 , HCO 3 - ). If alkalinity is present in water the CH wil
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Level 2 Acceptance Testing : This will also include the same tests as in Level 1 A. General inspection B. Test on specially moulded test piece C. Test on complete bearings
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Immersed tube method for underwater crossing includes the following basic construction steps: (i) Prefabricating long tunnel units (concrete orsteel shell) in a dry-dock or shi
The northing and easting coordinates for point C is most nearly: Solution: Section the triangle and calculate using Pythagorean Theorem and the Law of Sine's or us
A cylindrical specimen of a saturated soil fails under an axial stress 150 kN/m 2 in an unconfined compression test. The failure plane makes an angle of 52° with the horizontal.
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