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Increase in shaft diameter in pure torsion?

Question asked by Bryce Engle on Nov 24, 2010
Latest reply on Nov 29, 2010 by Bryce Engle

Why does a shaft subject to pure torsion show an increased diameter in the deformed result?  See the attached example.  A shaft is fixed on one end with a torque applied at the other.  The displacement plot is the UY direction along axis 1 (for tangential displacement).  This plot makes sense as it shows the most twist at the outer shell near the end of the shaft & basically no twist at the centerline & base of the shaft.  The plot is shown both with & without the deformed shape.  Why does it show this large increase in diameter?