In: Mechanical Engineering
FOLLOWING ARE THE RESTRICTIONS FOR OUTER AND INNER PRANDTL STRESS FUN CTION-
it is assumed that in the case of pure torsion, the
stresses are the same in every
normal cross-section.
In this method, the principal unknowns are the
stress components rather than the displacement components
.
stress components sigmax,
sigmay, sigmaz and sigmaxy are assumed to be zero. In order to
satisfy the equations of equilibrium.
the nonvanishing
stress components sigmazx and sigmayz.
The assumed stress components, if they are to be
proper elasticity
solutions, have to satisfy the compatibility
conditions.
f is constant around the boundary. Since the stress
components depend
only on the differentials of stress function f , for a simply
connected region, no loss of
generality is involved in assuming f = 0 on s .