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UDC 539.3
Technical mechanics, 2021, 1, 3  15
Problems in the strength and stability of inhomogeneous structures of rocket and space hardware with account for plasticity and creep
DOI:
https://doi.org/10.15407/itm2021.01.003
Hudramovich V. S., Sirenko V. N., Hart E. L., Klimenko D. V.
Hudramovich V. S.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Sirenko V. N.
Yuzhnoye State Design Office
Hart E. L.,
Oles Honchar Dnipro National University
Klimenko D. V.
Yuzhnoye State Design Office
Shell structures provide a compromise between strength and mass, which motivates their use in rocket
and space hardware (RSH). High and longterm loads cause plastic and creep deformations in structural
elements. RSH structures feature inhomogeneity: design inhomogeneity (polythickness, the presence of
reinforcements, openings, etc.) and technological inhomogeneity (defects produced in manufacturing,
operation, storage. and transportation, defects produced by unforeseen thermomechanical effects, etc.).
These factors, which characterize structural inhomogeneity, are stress and strain concentrators and
may be responsible for an early failure of structural elements and inadmissible shape imperfections.
In inhomogeneous structures, different parts thereof are deformed by a program of their own and
exhibit a different stress and strain level. In accounting for a physical nonlinearity, which is
governed by plastic and creep deformations, the following approach to the determination of the
stress and strain field is efficient: the calculation is divided into stages, and at each stage
parameters that characterize the plastic and creep deformations developed are introduced: additional
loads in the equilibrium equations or boundary conditions, additional deformations, or variable
elasticity parameters (the modulus of elasticity and Poisson’s ratio). Successive approximation
schemes are constructed: at each stage, an elasticity problem is solved with the introduction of
the above parameters. Special consideration is given to the determination of the launch vehicle
and launch complex life. This is due to damages caused by alternate highintensity thermomechanical
loads. The basic approach relies on the theory of low and highcycle fatigue. The plasticity and
the creep of a material are the basic factors in the consideration of the above problems. This paper
considers various aspects of the solution of RSH strength and stability problems with account for
the effect of plastic and creep deformations.
stress and strain field, strength, stability, plasticity, creep
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Copyright (©) 2021 Hudramovich V. S., Sirenko V. N., Hart E. L., Klimenko D. V.
Copyright © 20142021 Technical mechanics
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