Question: (a) Calculate the work done in expanding a 2-mm-thick spherical shell from a diameter of 100 mm to 140 mm, where the shell is made

(a) Calculate the work done in expanding a 2-mm-thick spherical shell from a diameter of 100 mm to 140 mm, where the shell is made of a material for which σ = 200 + 50e0.5 MPa.
(b) Does your answer depend on the particular yield criterion used? Explain.

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