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functional properties, fatigue life and cyclic crack resistance characteristics of NiTi

alloy can be used to assess the functional and structural lifetime of devices based on

SMA design and operation. There was proposed the methodology that allows to predict

the lifetime of pseudoelastic SMA under low-cycle fatigue at a constant amplitude

loading, taking into account the stress ratio and variable amplitude loading, based on

the criteria of fatigue failure, namely, the total elastic strain energy density, that can be

used to estimate structural long-term devices. The obtained research results are

introduced into the educational process of the Department of Structural Mechanics in

the preparation of scientific Masters and graduate students in the specialties 192

"Construction and Civil Engineering" and 131 "Applied Mechanics". ASTC

"Antonov" (from 17.01.2020) confirmed the possibility of using identified basic

patterns of temperature and stress ratio on the functional and mechanical fatigue of

SMA in the design of promising aircraft structures, as well as methods for predicting

lifetime and residual lifetime of SMA at constant and variable amplitude loading. SE

"Design Bureau" Southern "(from 25.08.2020) confirmed the use of the results of work

in terms of calculation methods and methods of testing the functional properties of the

damping device to assess the performance of devices to reduce dynamic loads during

transportation of long structures. LLC "Standard-Park" (from 10.06.2020) confirmed

the use of the results of work in terms of calculation methods and methods of testing
the functional properties of the damping device to increase the load-bearing capacity

of structural elements and engineering structures under the action of dynamic loads.

Keywords: pseudoelastic NiTi alloy; functional fatigue, structural fatigue,
dissipation energy, total elastic energy density, hydrogen embrittlement, stress ratio,

variable amplitude, fatigue crack growth, damper device

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковано основні наукові результати дисертації:

1. Iasnii V., Yasniy P., Dyvdyk O., Yasniy O., Lapusta Y. Functional behavior

of pseudoelastic NiTi alloy under variable amplitude loading. Acta Mechanica et