Poly tetra fluoro ethylene, Civil Engineering

Assignment Help:

Question
Why Poly tetra fluoro ethylene (PTFE) is usually used in sliding bearings?

Answer
The 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.


Related Discussions:- Poly tetra fluoro ethylene

Explain some important points for hazardous waste, Explain some Important P...

Explain some Important Points for Hazardous Waste The mixture rule prevents dilution of waste for the purposes of escaping RCRA regulation. Mixtures of a listed hazardous w

Category of bars reinforcement are more corrosion resistant, Question Which...

Question Which category of bars reinforcement are more corrosion resistant , epoxy-coated bars, stainless steel bars, galvanized bars? Answer Supported on experiment conducte

Explain the term - characteristic strength, Explain the term - Characterist...

Explain the term - Characteristic Strength The strength of  a material below which not more than 5 percent results are expected to fall is considered as the characteristic stre

Execution compression test for concrete, Question In execution compression...

Question In execution compression test for concrete , have to test cubes .Test cylinders be approved? Answer Essentially, results of compression test carried out by using cu

Geometric design, calculating OVERTAKING SIGHT DISTANCE

calculating OVERTAKING SIGHT DISTANCE

Influence line diagram, how to calculate when moment is present in the stru...

how to calculate when moment is present in the structure by influence line diagram

Verify the intensity of vertical stress at a point, Verify the intensity of...

Verify the intensity of vertical stress at a point A line load of 100 kN/metre run extends to a long distance. Verify the intensity of vertical stress at a point, 2 m below the

Consultant , how to convert a varying distributed load to a uniformly distr...

how to convert a varying distributed load to a uniformly distributed load

#titlemichelson interferometer.., Describ the construction and working of M...

Describ the construction and working of Michelson interferometer and discuss tha method to determine wavelength of monochromatic

Time to remove formwork to cater for early thermal movement, Q. Time to rem...

Q. Time to remove formwork to cater for early thermal movement? Let's take a circular column as an illustration to explain effect of internal restraint to thick sections.  W

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd