 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 13025 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8110
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| In English (Mech. Solids): | | 4915 |
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| L.A. Igumnov, V.E. Kostyukov, and M.Kh. Prilutsky, "Numerical Analysis of Fatigue Life of Structural Elements under Thermopulsations," Mech. Solids. 59 (7), 3712-3726 (2024) |
| Year |
2024 |
Volume |
59 |
Number |
7 |
Pages |
3712-3726 |
| DOI |
10.1134/S0025654424606463 |
| Title |
Numerical Analysis of Fatigue Life of Structural Elements under Thermopulsations |
| Author(s) |
L.A. Igumnov (Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603022 Russia, igumnov@mech.unn.ru)
V.E. Kostyukov (Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603022 Russia, staff@vniief.ru)
M.Kh. Prilutsky (Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603022 Russia, pril@iani.unn.ru) |
| Abstract |
The problem of parrying parametric non-stationary thermomechanical effects of critical
engineering infrastructure objects arising in the operating modes of these objects is considered. The
problem of obtaining strength and resource estimates is solved. A mathematical model of the mechanics of damaged environment (MDE) is developed for studying the processes of thermoviscoplastic
deformation and damage accumulation. The model takes into account material degradation by coupled joint mechanisms of low-cycle fatigue and long-term strength. The model is formed by relations
for cyclic thermoviscoplastic behavior of the material up to the process of destruction; equations of
damage accumulation kinetics; strength criterion of damaged material. Thermoviscoplastic is based
on the concepts of yield surfaces, creep, and the principle of gradient vectors of plastic deformation
and creep strain rates to the corresponding surface at the loading point. The model describes the main
effects of the process of cyclic thermoviscoplastic deformation of the material for arbitrary complex
loading trajectories. A scalar damage parameter is used in the kinetic equations of damage accumulation. The model is based on energy principles and takes into account the main effects of formation,
growth and merging of microdefects under arbitrary complex loading conditions. The condition of
reaching a critical value by damage is taken as the strength criterion. The presented calculations of
thermoviscoplastic deformation and damage accumulation are compared with the data of full-scale
experiments. In the example, an analysis of thermal fatigue of a structural element is carried out.
A welded joint under thermomechanical loading is investigated for a pressure vessel with stress concentrators. The performance of the presented model for assessing the fatigue life of structures under
multiaxial disproportionate paths of combined thermomechanical loading is shown. |
| Keywords |
thermal cycling fatigue, modeling, mechanics of damaged environment, stress-strain state, plasticity, creep, damage, fatigue life, destruction, resource |
| Received |
15 November 2024 | Revised |
21 November 2024 | Accepted |
22 November 2024 |
| Link to Fulltext |
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