A Thin Walled Tube

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A thin-walled tube, 300 mm long, has a wall thickness of 1.0 mm and an initial mean diameter of 120 mm. The plastic stress-strain curve for the material is given by
sigma = 500 epsilon^0.25 MPa.

The tube is subject to axial load F and internal pressure p so that the stress ratio sigma _ theta/sigma _z = 3.0at all times. The deformation continues until the effective stress equals 200 MPa. Ignoring sigma _r determine:
a) the effective strain at the end of the deformation process
b) the true strain components at the end of the deformation process
c) the final dimensions of the tube
d) the final axial load and internal pressure. Assume that the axial stress in not affected by the internal pressure.