**43**, 1-2, pp. 27-44, 1995

### Plane Contact of a Cylindrical Opening Stiffened by a Thin Shell

In the present paper the plane contact problem is considered, concerning a circular cylindrical hole stiffened by an elastic circular cylindrical tube (stringer) around its perimeter in a biaxial state of stresses at infinity. For the formulation of the interface conditions, the elastic stringer is considered to behave as a thin shell, and its outer diameter, prior to its insertion into the hole, may be equal or greater than the radius of the hole by a small value of the order of the (infinitesimal) elastic displacements. The solution of this mixed boundary value problem in plane strain conditions is found by numerical integration of a system of a complex singular, and complex regular integral equation describing the boundary and interface conditions of the problem, respectively. The classical method of Kolosov-Muskhelishvili complex potentials *ɸ*_{o}(*z*), Ѱ_{o}(*z*), in combination with the theory of singular integral equations, is considered in this paper in order to obtain the solution of the mixed boundary value problem stated above.

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