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Kiev, Ukraine

Naumenko V.P.,Ukrainian Academy of Sciences | Limanskii I.V.,State Enterprise Antonov
Strength of Materials | Year: 2014

The paper considers the problems within an extensive research program addressing the crack propagation in flat and tubular specimens of brittle and plastic materials of different physical nature. Based on implementation of the program, the authors have elaborated scientific fundamentals for a new approach to fracture analysis of sheet metals and thin-wall structures. It is shown the task of high priority for formulating a practically acceptable transferability law is to obtain experimental data on evolution of the crack void geometry starting from the crack initiation and till the specimen breakdown. © 2014, Springer Science+Business Media New York. Source


Naumenko V.P.,Ukrainian Academy of Sciences | Limanskii I.V.,State Enterprise Antonov
Strength of Materials | Year: 2014

This paper considers the basic principles of the most widespread methods for determining typical states of a mode I through crack in specimens and structures of sheet metals that are fractured under conditions close to the plane stress state. The results of experimental investigations are presented which make it possible to judge of the relative advantages and disadvantages of these methods from the standpoint of their possible use in engineering assessments of the integrity and remaining strength of thin-wall structures. © 2014 Springer Science+Business Media New York. Source


Korol V.N.,State Enterprise Antonov | Yasinskiy A.G.,State Enterprise Antonov
Tsvetnye Metally | Year: 2014

Nowadays, high-strength aluminium alloys with Al - Cu - Mg - Mn and Al - Zn - Cu - Mg alloying system are recommen ded for manufacturing of airplane structures. The materials are joint together by mechanical method, because the base material does not possess the good fusion weldability. The aluminium alloy AD37 (AII37) was developed for the products, which work in all climate conditions, mainly for outer skin and internal set of airframe (including welded designs). The complex of positive characteristics allows to apply AD37 alloy in airframe, including welded modification. The friction stir welding is applied in aerospace industry. The favorable thermal cycle of process does not reduce the mechanical characteristics of welded material, which gives the possibility to make the welding of parts in preliminary strengthened condition, keeping high strength properties. There is studied the influence of heat treatment in the different modes before and after welding of butt joints of AD37 alloy, obtained by friction stir welding. There are given the results of mechanical tests and metallographic studies. There is established the change of the alloy structure in different seam zones, caused by thermomechanical impact upon welding and heat treatment. The possibility of increasing of strength of joints in case of samples' welding in artificial aging conditions is shown together with the same possibility, using rehardening with artificial aging after welding. In this case, thermal hardening of welded joints allows to increase their strengthening up to 400 MPa. Source

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