This problem, in my opinion, should actually be a sub-part of problem 1.312, I am really not sure why Irodov decided to make it a separate problem. As seen from eqn (1) in solution to problem 1.312, at a distance of r from the axis the strain is given by,

Thus, the strain energy per unit volume at a distance r is given by,

## Saturday, May 2, 2009

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