# Uniform wear theory - Relation between p & r - Theory of Machines - 1

Q.  Which of the following condition is true for uniform wear theory?
- Published on 06 Aug 15

a. p = constant
b. p/r = constant
c. p.r = constant
d. none of the above

#### Discussion

• Sravanthi   -Posted on 19 Oct 15
- The relative motion between contact surfaces of shaft and thrust bearing is restricted by friction between them.

- Depending on surface materials, lubrication, speed and pressure between surfaces the coefficient of friction is varied.

- If uncertainty of load distribution is observed between surfaces in contact, two assumptions are considered as below:

1) Uniform pressure theory

2) Uniform wear theory

- According to uniform pressure theory, the intensity of pressure distributed over the contact area is constant. Load is well distributed over the entire surface in new bearings and the fit between shaft and bearings is perfect.

- If old bearings are used, wear at different radii is different and redistribution of pressure intensity is observed.

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