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A steel cylinder having 12.5 cm outside diameter has a wall thickness of 1.5 cm. The cylinder is used as a pressure vessel to hold fluid at an internal pressure of 30 MPa. Assume that the ends of the cylinder are closed. Calculate

(i)  the radial and tangential stress at the inner and outer surfaces,

(ii) the three principal normal strains at the inner surface, assuming that the material does not yield.

Take Young’s modulus = 2×105 N/mm2 Poisson’s ratio = 0.3  

                                

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