Problem_11_19 - Problem 11.19 Given A closed cylinder is...

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80 mm D o = ? Problem 11.19 Given: A closed cylinder is made of a ductile steel that has a yield stress Y = 600 MPa. The inside diameter of the cylinder is 80 mm. Determine the outside diameter of the cylinder if the cylinder is subjected to an internal pressure of p 1 = 140 MPa and the cylinder is designed using a factor of safety of SF = 1.75 based on the maximum shear-stress criterion of failure. Solution: a 80 mm 2 := p 1 140 MPa := p 2 0 MPa := P0 := SF 1.75 := Y 600 MPa := Using Eq. 11.20 at at r=a gives: σ rr p 1 140 MPa = := Assume that σ rr σ zz < σ θθ < so that SF Y 2 σ θθ σ rr 2 = Y σ θθ σ rr () = Thus: σ θθ Y SF σ
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