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Find out the intensity of the external pressure:
A thick cylinder of 0.5 m external diameter & 0.4 m internal diameter is subjected simultaneously to internal & external pressures. If the internal pressure is equal to 25 MN/m2 and the hoop stress at the inside of the cylinder is 45 MN/m2 (tensile), find out the intensity of the external pressure.
Solution
By using Lame's expression for hoop stress and radial stress, which are
σh = ( b /r2 )+ a
and
σr = b/r2 - a
For the internal surface, i.e. r = 0.2 m,
25= b/0.22 + a
45 = b/0.22 + a
On solving out , we get b = 1.4 and a = 10.
Therefore, the intensity of external pressure at r = 0.25 shall be
σr = (1.4 / 0.252 )- 10 = 12.4 MN/m2
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