To visualize the importance of using the thick-walled formulas for computing stresses in the walls of a cylinder, compute the maximum predicted tangential stress in the wall of a cylinder from both the thin-walled and thick-walled formulas for the following conditions. The outside diameter for all designs is to be 400 mm. The wall thickness is to vary from 5.0 mm to 85.0 mm in 10.0 mm increments. Use a pressure of 10.0 MPa. Then compute the ratio of Dm/t and plot percent difference between the stress from the thick-walled and thin-walled theory versus that ratio. Note the increase in the percent difference as the value of Dw/t decreases, that is, as t increases.
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