Modelling cracking in perforated stringer panels

The problem of mechanics of fracture about nucleation of cracks in supported cross-section stringers to a plate with an infinite number of circular holes is considered. The mathematical description of model of nucleation of cracks is lead. The action of the stringers is modelled by the unknown equivalent concentrated forces in points of connection of edges with a plate. Solution of the unknown parameters describing a germinal crack, is reduced to the solution singular integral equation, from the solution of this equation efforts are found in a strip of nucleation of a crack. The solution defining critical value of external loading at which occurs cracking is received.