TECHNICAL MECHANICS
ISSN (Print): 1561-9184, ISSN (Online): 2616-6380

HOME    ABOUT THIS JOURNAL    EDITORIAL BOARD    GUIDE FOR AUTHORS    CURRENT    JOURNAL ISSUES    CONTACTS

UDC 629.4:62-758.2

Technical mechanics, 2018, 3, 112 - 120

NORMALIZATION OF ENGINEERING SYSTEM STRENGTH AND RELIABILITY

DOI: https://doi.org/10.15407/itm2018.03.112

Hudramovych V. S., Daniev Yu. F., Poshyvalov V. P.

Hudramovych V. S.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Ukraine

Daniev Yu. F.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Ukraine

Poshyvalov V. P.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine
Ukraine

      This paper briefly overviews the studies conducted in 2014 – 2018 along the following research line of the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine approved by the Presidium of the National Academy of Sciences of Ukraine: the strength, reliability and optimization of mechanical systems, launch vehicles, and spacecraft. The paper generalizes investigations into the effect of local loads and contact interactions of structural components which result in stress and strain concentra-tion and plastic deformation zones and increase the risk of failure under local actions. Failure mechanisms, which govern limiting loads and safety factors, are constructed using schemes of a perfectly plastic material. Carrying capacity prediction schemes for thin-walled structures are considered with account for plastic deformations. Pro-jection iterative schemes of the local variation method, which reduce the computation time in comparison with the standard local variation method, are proposed. The paper considers solar concentrator dynamics and strength simulation issues and investigations into the vibration strength, local-loading strength, and thermal strength of solar concentrators and into the effect of residual stresses developed in production processes and electrolyte formulation for those processes. Methods were developed for increasing the longevity of materials by setting up self-organizing processes therein under energy loading with fields of different physical nature. Normative basics were developed for calculating the life of launch vehicle launching facility structures. Quantitative and qualitative requirements for the reliability of an engineering system and components thereof to be met at the design stage were identified. Software reliability models and failure features were analyzed. Basic approaches to software reliability assurance were analyzed, and it was pointed out that they cannot assess software reliability in full measure. Factors that affect the number of software errors and factors that contribute to software reliability im-provement were revealed, and ways to improve software reliability were proposed.

strength, reliability, longevity, engineering systems, residual life, projection iterative methods

1. Hart E., Hudramovych V. Projection-iterative version of the local variation method and its application to problems of shell structure strength under local loads. Modern Problems of Mechanics and Mathematics: Collected papers of the Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences of Ukraine in 3 volumes. 2018. V. 1. Pp. 28-29. URL: www.iapmm.lviv.ua/mpmm2018 (last accessed Sept. 2, 2018). (in Ukrainian).

2. Hart E. L., Hudramovich V. S. Projection-iterative modification of the method of local variations for problems with a quadratic functional. J. Appl. Math. Mech. 2016. V. 80. Iss. 2. Pp. 156-163. https://doi.org/10.1016/j.jappmathmech.2016.06.005

3. Hudramovich V. S., Klymenko D. V., Hart E. L. Influence of cutouts on strength of cylindrical compartments of launch vehicles at inelastic deformation of material. Space Sci. & Technol. 2017. V. 23. No. 6. Pp. 12-20. (in Russian). https://doi.org/10.15407/knit2017.06.012

4. Hudramovych V. S., Hart E. L., Strunin K. A. Effect of local discrete reinforcements and inclusions modeling changes in the material microstructure on the strength of engine case components. XXIIIth International Congress of Engine Builders (Sept. 3-8, 2018, Koblevo, Mykolaiv Region). Kharkiv, 2018. P. 26. (in Russian).

5. Hudramovych V. S. Effect of openings on the limiting states of thin-walled metal shell-and-plate structure components. Visnyk Dnipropetrovskoho Universytetu. Ser. Mekhanika. 2014. Iss. 18. V. 22. Pp. 47-60. (in Russian).

6. Hudramovych V. S., Hart E. L., Marchenko O. A. Effect of the shape of reinforcements on the stress and strain fields in a cylindrical shell with elongated rectangular openings. Problems in Computa-tional Mechanics and Structural Strength: collected papers. Dnipro: Lira, 2017. Iss. 27. Pp. 52-64. (in Ukrainian).

7. Hudramovych V. S., Skalskyi V. R., Selivanov Yu. M. Holographic and Acoustic Emission Diagnostics of Inhomogeneous Structures and Materials: monograph. Z. T. Nazarchuk (Ed.). Lviv: Prostir-M, 2017. 492 pp. (in Ukrainian).

8. Hudramovich V. S., Dzyuba A. P., Selivanov Yu. M. Methodology for selecting rational material distribution for structural thin-walled elements. Teh. Meh. 2016. No. 3. Pp. 7-16. (in Russian).

9. Hudramovych V. S., Hart E. L., Strunin K. A. Computer simulation of the behavior of an elastic medium with two conjugate ellipse-like inclusions. Problems in Computational Mechanics and Structural Strength: collected papers. Dnipro: Lira, 2017. Iss. 26. Pp. 42-50. (in Russian).

10. Hudramovych V. S., Hart E. L. Finite-element analysis of the scattered failure of plane-strain media with local stress concentrators. Elasticity and Ine-lasticity: International Scientific Symposium on Problems in Mechanics of De-formable Bodies in Honor of the 105th Anniversary of A. A. Ilyushin Birth (January 2016, Moscow, Russia). Moscow: Moscow State University, 2016. Pp. 158-161. (in Russian).

11. Hudramovych V. S., Dzyuba A. P., Selivanov Yu. M. Methods of Holo-graphic Pnterferometry in the Mechanics of Inhomogeneous Thin-Walled Structures: monograph. Dnipro: Lira, 2017. 288 pp. (in Russian).

12. Hudramovych V. S. Simulation of the dynamics and strength of solar con-centrators. Science, Technology, and Innovation Techniques in the Epoch of Might and Happiness: International Scientific Conference (2015, Ashkhabad, Turkmenistan). V. 1. Pp. 148-149. (in Russian).

13. Hudramovych B. S., Hart E. L., Strunin R. A. Simulation of straining the plate with elastic extended inclusions based on finite element method. Teh. Meh. 2014. No. 2. Pp. 12-23. (in Russian).

14. Hudramovych V. S., Hart E. L., Riabokon S. A. Simulation and study of the effect of rectangular opening reinforcements of the stress and strain fields in a plate. Mathematical Problems in Inhomogeneous Structure Mechanics: IÕth International Scientific Conference (September 2014, Lviv, Ukraine). Lviv: Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences of Ukraine, 2014. Pp. 43-46. (in Ukrainian).

15. Hudramovich V. S. Review of studies in creep theory conducted at Insti-tute of Technical Mechanics of the National Academy of Sciences of Ukraine and State Space Agency of Ukraine. Teh. Meh. 2015. No. 4. Pp. 85-91. (in Russian).

16. Hudramovich V. S., Hart E. L. Projection-iterative version of the method of local variations for the problems of local stability of spherical shells. Dopov. Nac. Akad. Nauk Ukr. 2015. No. 8. Pp. 35-42. (in Russian). https://doi.org/10.15407/dopovidi2015.08.035

17. Hudramovych V. S., Hart E. L. Finite-element schemes for the analysis of the scattered failure of elastoplastic bodies with local stress concentrators. Material Failure Mechanics and Structural Strength: 5th International Confer-ence (June 2014, Lviv, Ukraine). Lviv: Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 2014. Pp. 39-42. (in Ukrainian).

18. Hudramovych V., Hart E., Strunin K. Numerical analysis of the stress and strain fields in plane media with extensive inclusions of different strength. Cur-rent Problems in Thermomechanics. Kyiv: Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of the National Academy of Sci-ences of Ukraine, 2016. Pp. 78-79. (in Ukrainian).

19. Daniev Yu. F., Poshyvalov V. P., Reznichenko L. V. Probabilistic models of the mean residual life of engineering systems. System Technologies. 2018. No. 2 (115). Pp. 53?60. (in Russian).

20. Poshyvalov V. P., Daniev Yu. F., Reznichenko L. V. General principles of ergative system reliability assurance. System Technologies. 2014. No. 1 (90). Pp. 121-127. (in Russian).

21. Poshyvalov V. P., Daniev Yu. F., Reznichenko L. V. System approach to complex system reliability assurance. System Technologies. 2017. No. 2 (109). Pp. 27-34. (in Russian).

22. Hydramovych V., Poshyvalov V., Daniiev Yu., Reznychenko L. Probabilis-tic approaches to structure life prediction at the design stage. Modern Prob-lems of Mechanics and Mathematics: Collected papers of the Pidstryhach In-stitute for Applied Problems of Mechanics and Mathematics of the National Academy of Sciences of Ukraine in 3 volumes. 2018. V. 2. Pp. 177-178. URL: www.iapmm.lviv.ua/mpmm2018 (last accessed Sept. 2, 2018). (in Ukrainian).

23. Hydramovych V. S., Reprintsev A. V., Ryabokon S. A., Samarskaya E. V. Methodology for life assessment of space shell structures with account for the effect of stress concentrators in the form of cutout openings. Problems of Structure, Building, and Machine Life and Operation Safety: Collected papers. Kyiv: Paton Institute of Electric Welding of the National Academy of Sciences of Ukraine, 2015. Pp. 83-95. (in Russian).

24. Degtyarev A. V., Pylypenko O. V., Gudramovych V. S., Sirenko V. N., Daniev Yu. F., Klimenko D. V., Poshivalov V. P. About the classification of launch equipment of the space launch systems for the strength standards jus-tification. Kosm. Nauka Tehnol. 2016. V. 22. No. 1. Pp. 3-14. (in Russian). https://doi.org/10.15407/knit2016.01.003

25. Hudramovych V. S., Poshyvalov V. P, Daniev Yu. F., Reznichenko L. V., Samarskaya E. V., Telegina I. I. On approaches to structural strength normali-zation. Mathematical Problems in Technical Mechanics - 2017: International Scientific Conference (April 2017, Dnipro). Dnipro, Kamianske, 2017. P. 5. (in Russian).

26. Gudramovich V. S., Reprintsev A. V., Ryabokon S. A., Samarskaya E. V. Evaluation of life of structures of rocket-space equipment taking into account the effect of stress concentrators in form of holes. Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol. 2016. No. 2. Pp. 28-36. (in Russian). https://doi.org/10.15407/tdnk2016.02.03

27. Poshyvalov V. P., Daniev Yu. F. On models of ergative system software reliability. Teh. Meh. 2017. No. 4. Pp. 84-95. (in Russian). https://doi.org/10.15407/itm2017.04.089

28. Hudramovych V. S., Sirenko V. N., Daniev Yu. F., Poshyvalov V. P., Kli-menko D. V. Development of normative basics for calculating the life of launch vehicle launching facilities. Dynamics, Strength, and Simulation in Mechanical Engineering: Ist International Conference on Science and Technology (Sept. 10 - 14, 2018, Kharkiv, Ukraine). P. 25. (in Russian).

29. Doyar I., Poshyvalov V. Development of a stochastic model of failure of structural material in creep at hardening stage. Eastern-European Journ. of Enterprise Technologies. 2016. No. 3 (5). Pp. 25-31. https://doi.org/10.15587/1729-4061.2016.69653

30. Hart E. L, Hudramovych V. S. Projection-iterative schemes for implemen-tation of the finite element method in problems of deformation of plates with holes and inclusions. J. of Math. Sci. 2014. V. 175. No. 2. Pp. 1-14. https://doi.org/10.1007/s10958-014-2090-x

31. Hart E. L, Hudramovych V. S. Projection-iterative modification of the method of local variations for problems with a quadratic functional. J. Appl. Math. Mech. 2016. V. 80. Iss. 2. Pp. 156-163. https://doi.org/10.1016/j.jappmathmech.2016.06.005

32. Hudramovych V. Contact interactions and limit states of the shell-type structures under local loading. Proceedings of 2016 China-Ukraine Forum on Science and Technology (July, 2016, Harbin, China). Harbin, 2016. Pp. 2-3.

33. Hudramovóch V. S., Hart E. L., Strunin K. A. Modeling of the behavior of plane-deformable elastic media with elongated elliptic and rectangular inclu-sions. Materials Science. 2017. V. 52. No. 6. Pp. 768-774. https://doi.org/10.1007/s11003-017-0020-z

34. Hudramovych V. S., Levin V. M., Samarskaja E. V., Shabelnik S. V. Mod-eling of the deformation process of concrete based on a modified version of the theory of flow. Strength of Materials. 2014. V. 46. Iss. 5. Pp. 595-600. https://doi.org/10.1007/s11223-014-9587-x

DOI: https://doi.org/10.15407/itm2018.03.112

Copyright (©) 2018 Hudramovych V. S., Daniev Yu. F., Poshyvalov V. P.

Copyright © 2014-2018 Technical mechanics