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

Vacancy for teaching?, I am a civil engineer and interested to teach.Is the...

I am a civil engineer and interested to teach.Is there any vacancy?

Define ways of providing the anti slip device - by embedment, Define Ways o...

Define Ways of providing the anti slip device - By Embedment? A recess can be created in the bed block in which the elastomeric pad will be placed. The functioning of the reces

PRC, what is the bleeding of concrete?

what is the bleeding of concrete?

Determine the analysis of presress, Analysis of presress  In pre-stress...

Analysis of presress  In pre-stressed structural elements, stretched tendons are placed inside concrete. The tensile stresses of the tendons are transferred to concrete in the

Compaction, describe how quality control is maintained in a rolled fill dam...

describe how quality control is maintained in a rolled fill dam

Hydraulic design problems, This assignment is a Hydraulic Design assignment...

This assignment is a Hydraulic Design assignment for Civil Engineering Major in USA. Please try if there is someone professional who can do this work because it''s too sensitive. f

Cost-volume-profit and break even analysis, Cost-Volume-Profit and Break Ev...

Cost-Volume-Profit and Break Even Analysis: Cost-volume-profit analysis helps us to learn the behaviour of cost and profit in response to varying level of business activity. I

Correction in bearing, write a c program To compute interior angles and cor...

write a c program To compute interior angles and correct them for observational errors and adjusting the bearing of remaining sides when the bearings taken on a closed compass trav

Plant location and facility layout, Plant Location and Facility Layout: ...

Plant Location and Facility Layout: This unit explain the general definition of Plant location and facility layout. Several factors affecting the location decision of a firm o

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