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alloy under constant and variable amplitude taking into account the stress ratio the
total elastic energy density. It was established that, unlike traditional structural
materials, the dissipated energy does not affect the formation of fatigue damage and
fatigue life of pseudoelastic SMA.
6. There was elaborated the method for predicting the lifetime of pseudoelastic
SMA under low-cycle fatigue at constant and variable amplitude, taking into account
the stress ratio, which is based on the criterion of fatigue failure, determined by
constant amplitude – the total elastic strain energy density.
7. There was proposed the method of accelerated determination of parameters in
the fatigue failure model, that is based on the criteria of the total elastic strain energy
density according to the results of the test with uniaxial quasistatic tension and at a
fixed constant load amplitude.
8. There was developed a method for predicting the residual durability of
structural elements made of SMA of circular cross-section with a surface semi-elliptic
crack, which is based on solving a system of equations describing crack propagation,
load parameters and cyclic crack resistance parameters, taking into account their
statistical scatter and shape change.
9. There was developed a damping device protected by intellectual property
patents, which is based on the use of the SMA pseudo-elastic effect, and its functional
characteristics were established.
Practical significance of the obtained results. An intellectual property-protected
damping device has been developed, which is based on the use of a pseudo-elastic
shape memory alloy and can be used as a prototype in the creation of full-fledged
damping devices to reduce dynamic loads on engineering and construction structures
and in transporting long thin-walled structures. The methodology of studying the
functional characteristics of the damping device in a wide amplitude-frequency range
of load can be used to certify the damping devices based on the use of shape memory
alloys. The obtained set of new experimental data on the effect of hydrogen on
mechanical behavior and temperature, stress ratio and variable load amplitude on the
