internal barrel surface, increase the barrel elastic strength pressure
and slow down the development of cracks. Furthermore, it is
sometimes necessary to machine the barrel to its final dimensions,
which reduces the contribution of residual stresses.

Since the basic data for calculating elastic strength pressure and

fatigue life are derived from a precise distribution of the residual
stresses, a theoretical solution for these stresses must be as close
as possible to the practical one. Although there are many solutions

which deal with the problem of determining stress distribution,

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none of them are completely satisfactory, since they are all based
on certain assumptions on yield criteria and other effects.