FR1 16?xD

4 nEt3

For v = 0.3 this is approximately 2.5 times that for the clamped edge condition. From eqn. (7.14),

Substituting for dBjdr and B/r as above, dB e dr r

Thus the radial stress ar will be zero at the edge and will rise to a maximum value (theoretically infinite) at the centre. However, in practice, load cannot be applied strictly at a point but must contact over a finite area. Provided this area is known the maximum stress can be calculated.

Similarly, from eqn. (7.15)

and, again substituting for d0/dr and 0/r,

0 0

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