Yartemyk V. A stress state of isotropic shells with system of cracks (through, surface and internal)

In dissertational work the technique of research of the stress state of shells with through cracks is widespread to a case of shells with through, surface and internal cracks. Systems singular integral equations for research problems of the disturbed state of isotropic shells with the cracks of different length oriented along both lines of the main curatives have been received. Out researches of interaction of cracks of one type (through, surface and internal) in shells are carried. Stresses and moments intensity factor for through cracks and SIF for part-through cracks were calculated. Relation between length, depth of cracks, distance between them and shell curative is established. A number of laws at investigated shells with systems of cracks of different type (the mixed systems) is indicated. Essential influence of depth of part-through cracks on IF stresses and moments for through cracks are shown. The offered updating of line-spring model within the bounds of which the stress state of an shell with three cracks in system with surface is investigated, located along both lines of the main curatives. The comparative analysis between the decisions received by means of the classical and modified approach is resulted. For the considered problems program complexes which have allowed leading calculations in a wide range of parameters have been created. Numerical researches have shown efficiency of the used technique and the good agreement with known solution.