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THICK-WALLED CYLINDERS An open compound steel cylinder (material properties in table below) is formed by shrinking a tube with outer diameter do = 600 mm and inner diameter d = 460 mm onto one with inner diameter di = 400 mm. The interface pressure at the common surface after the shrinkage is pc = 28 MPa. ● ● ● ● Ti Tc/1 O To This cylinder is now internally pressurised at p; = 110 MPa. Determine the magnitude and position of the maximum stress using superposition. Calculate the safety factor of the structure under these loading conditions and discuss the effects of loading it with an additional external pressure po. Calculate and draw the stress distributions before and after pressurisation on a diagram and comment on what is happening at the interface of the two cylinders. Find the required diametral interference to obtain the indicated contact pressure. Research the most common fabrication techniques for these kind of pressure vessels, assessing their advantages and disadvantages. INNER TUBE OUTER TUBE Po E [GPa] V 210 280 0.3 0.3 Oy [MPa] 350 390