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

What is diversion tunnel in a dam, When a dam is to be built, a diversion t...

When a dam is to be built, a diversion tunnel is usually bored by solid rock next to the dam site to bypass the dam construction site. The dam is built while the river flows by the

Explain the unit hydrograph method, Q.- Explain the Unit hydrograph Method ...

Q.- Explain the Unit hydrograph Method for estimation of peak flood discharge in a river. Ans.- Unit hydrograph Method A hydrograph is a representation of hydraulic cha

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

Distomat, Feactures and uses of distomat

Feactures and uses of distomat

Chain survey, what are the obstacles in chain survey in brief

what are the obstacles in chain survey in brief

Timber, uses of timber in civil engineering field and its physical state an...

uses of timber in civil engineering field and its physical state and chemical formula or symbol?

What is tendonand describe its working, What is Tendonand describe its work...

What is Tendonand describe its working It is a steel element, such as a wire, cable, bar or strand which is provided, in a stretched form, to impart prestressing force in con

Define the design of piers and abutments erected in water, Define the Desig...

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

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