VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University1024310.18287/2541-7533-2022-21-1-34-41Research ArticleStrength calculation of parts based on stress state stiffnessBukatyiA. S.<p>Doctor of Science (Engineering), Associate Professor;<br />Head of Laboratory</p>bukaty@inbox.ruhttps://orcid.org/0000-0002-8570-5370BukatyiS. A.<p>Doctor of Science (Engineering), Professor</p>bukaty_sa@mail.ruhttps://orcid.org/0000-0002-3617-9095Samara National Research University“Aviaagregat” JSC2704202221134412704202227042022Copyright © 2022, VESTNIK of Samara University. Aerospace and Mechanical Engineering2022<p>In the framework of this research it is shown that strength calculation of the most critical parts requires taking into account the parameter of stress state stiffness determined by the G. A. Smirnov-Alyaev. A method for estimating the level of strain of parts and diagnosing the most critical zones of parts based on dimensionless energy and complex criteria is proposed. The effectiveness of the method that can be used not only to diagnose critical zones, but also to optimize the geometric parameters of the design of critical parts, is shown.</p>Жёсткость напряжённого состоянияпрочность деталеймоделирование деталейStress state stiffnessstrength of partsmodeling of parts[Fridman Ya.B. Edinaya teoriya prochnosti materialov [Unified theory of strength of materials]. Moscow: Oborongiz Publ., 1943. 94 p.][Fridman Ya.B. Deformatsiya i razrushenie metallov pri staticheskikh i dinamicheskikh nagruzkakh [Deformation and fracture of metals under static and dynamic loads]. Moscow: Oborongiz Publ., 1946. 228 p.][Fridman Ya.B. Mekhanicheskie svoystva metallov. Ch. 1. Deformatsiya i razrushenie [Mechanical properties of metals. Part one. Deformation and fracture]. Moscow: Mashinostroenie Publ., 1974. 472 p.][Bukatyy A.S. Metodologiya optimizatsii konstruktsii i tekhnologii poverkhnostnogo uprochneniya aviatsionnykh detaley na osnove kriteriya zhestkosti napryazhenno-deformirovannogo sostoyaniya. Dis. … dokt. tekhn. nauk [Methodology for optimizing the design and technology of surface hardening of aircraft parts based on the criterion of rigidity of the stress-strain state]. Samara, 2019. 312 p.][Smirnov-Alyaev G.A. Soprotivlenie materialov plasticheskomu deformirovaniyu. Inzhenernye metody rascheta operatsiy plasticheskoy obrabotki materialov [Resistance of materials to plastic deformation. Engineering methods for calculating operations of plastic working of materials]. M.-L.: Mashgiz Publ., 1961. 463 p.][Smirnov-Alyaev G.A. Mekhanicheskie osnovy plasticheskoy obrabotki metallov. Inzhenernye metody [Mechanical principles of plastic working of metals. Engineering methods]. Leningrad: Mashinostroenie Publ., 1968. 272 p.][Smirnov-Alyaev G.A. Soprotivlenie materialov plasticheskomu deformirovaniyu. Inzhenernye raschety protsessov konechnogo formoizmeneniya materialov [Resistance of materials to plastic deformation. Engineering calculations of the processes of final forming of materials]. Leningrad: Mashinostroenie Publ., 1978. 368 p.][Peterson R.E. Stress concentration factors. New York: John Wiley & Sons, 1974.]