5. Strength and stability of inhomogeneous structures of space technology, considering plasticity and creep

5. Strength and stability of inhomogeneous structures of space technology, consid-ering plasticity and creep

Hudramovich V. S., Sirenko V. N., Klimenko D. V., Hart E. L.

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine; The Institute of Technical Mechanics, Dnipro, Ukraine; Oles Honchar Dnipro National University, Dnipro, Ukraine

Kosm. teh. Raket. vooruž. 2020, (1); 44-56
https://doi.org/10.33136/stma2020.01.044
 
Language: Russian
Annotation:
The shell structures widely used in space rocket hardware feature, along with decided advantage in the form of optimal combination of mass and strength, inhomogeneities of different nature: structural (different thicknesses, availability of reinforcements, cuts-holes et al.) and technological (presence of defects arising in manufacturing process or during storage, transportation and unforseen thermomechanical effects). The above factors are concentrators of stress and strain state and can lead to early destruction of structural elements. Their different parts are deformed according to their program and are characterized by different levels of stress and strain state. Taking into consideration plasticity and creeping of material, to determine stress and strain state, the approach is effective where the calculation is divided into phases; in each phase the parameters are entered that characterize the deformations of plasticity and creeping: additional loads in the equations of equilibrium or in boundary conditions, additional deformations or variable parameters of elasticity (elasticity modulus and Poisson ratio). Then the schemes of successive approximations are constructed: in each phase, the problem of elasticity theory is solved with entering of the above parameters. The problems of determining the lifetime of space launch vehicles and launching facilities should be noted separately, as it is connected with damages that arise at alternating-sign thermomechanical loads of high intensity. The main approach in lifetime determination is one that is based on the theory of low-cycle and high-cycle fatigue. Plasticity and creeping of material are the fundamental factors in lifetime substantiation. The article deals with various aspects of solving the problem of strength and stability of space rocket objects with consideration for the impact of plasticity and creeping deformations.
Key words: shell structures, stress and strain state, structural and technological inhomogeneity, thermomechanical loads, low-cycle and high-cycle fatigue, lifetime.

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