Buckling Analysis and Stability of Compressed Low-Carbon Steel Rods in the Elastoplastic Region of Materials

[EN] This paper presents new approaches for solving a problem of the stability of compressed rods in the elastoplastic working region of materials. It is known that the columns of buildings, supports of engineering devices, drill rods of oil, and gas extraction industry may be subjected to significant risk of stability loss. Nowadays, there are design methods based on test results defining the relations (e.g., critical stresses-slenderness) to avoid this risk due to stability loss, but the precision and limits of definition are not always known. The main objectives of the study were to develop new approaches that would allow specifying the values of critical stresses of compressed elements beyond the proportional limit. The problem of stability of the compressed elements in the elastoplastic region was studied according to the stability theory. The authors suggested an original approach to the issue; in particular, the determination of values of the critical stresses and the finding of the points of the bifurcation were carried out by the tangent established by experimental results and by the approximation of the so-called double modulus. Comparative analysis showed the advantage of the proposed approach, particularly that the new critical curves were located below the curves of Engesser-Karman and Shanley and above the critical curves established by building codes. A new approach for the determination of critical stresses in the elastoplastic region was developed through which the structural reliability and economic efficiency was increased by almost 12% compared to the existing approaches.This research was financially supported by the Erasmus Mundus Action 2 Project Electra: Enhancing Learning in ENPI Countries through Clean Technologies and Research related Activities (project: ELEC1400294) and the Spanish Ministry of Economy and Competitiveness, along with FEDER funding (project: BIA2017-85098-R).Partskhaladze, G.; Mshvenieradze, I.; Medzmariashvili, E.; Chavleshvili, G.; Yepes, V.; Alcalá-González, J. (2019). Buckling Analysis and Stability of Compressed Low-Carbon Steel Rods in the Elastoplastic Region of Materials. Advances in Civil Engineering. 2019:1-9. https://doi.org/10.1155/2019/7601260S192019Braun, D. J. (2008). On the optimal shape of compressed rotating rod with shear and extensibility. 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Creation of large size, lightweight, rigid and precision reflectors is the problem that still remains in the field of space antennas. In recent years, a voluminous work has been being conducted jointly by the European Space Agency, Munich Technical University and Georgian Technical University aiming at finding out a new structural design. The structures of the rings having a new design circular double pantograph, conical V-fold bars, unfolding springs and electrical motors, and of the flexible, geometrically unchangeable center have been elaborated and theoretically and experimentally studied within the scope of the work. The researches and tests revealed pros and cons of the new constructions. In their entirety, the structures are rigid, precision, lightweight and are capable of controlling and managing the transforming processes

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The paper describes how an activity is going on for a design, development and realisation of a large 12 meter deployable reflector antenna For space applications. The reflector antenna system is subject of an ESA contract awarded to Alenia Spazio as a prime contractor. The Russian company NPO EGS is responsible as sub-contractor for an important element, which is the deployable reflector. Alenia has provided, together with ESA, instrumentation and testing expertises for assessment of Passive Intermodulation properties of the realised reflector, which is currently being prepared for environmental testing. Background knowledge was fed into the program from the Georgian antenna design, comparable to the one, which did fly on MIR station