Numerical simulation of the creep process of titanium alloy VT6 under a multi-axis stress state taking into account the influence of an aggressive environment

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Abstract

The problem of assessing the strength and resource of critical engineering objects is considered. The operating conditions of objects are characterized by high-temperature non-stationary thermomechanical effects, which lead to degradation of the initial strength properties of structural materials by the mechanism of long-term strength.

From the standpoint of the mechanics of a damaged medium, a mathematical model has been developed that describes the kinetics of the stress-strain state and the accumulation of damage during material degradation by the mechanism of long-term strength under conditions of a complex multiaxial stress state.

An experimental-theoretical method for finding the material parameters and scalar functions of the constitutive relations of the mechanics of a damaged medium based on the results of specially set experiments on laboratory samples is proposed.

The results of experimental studies and numerical modeling of the short-term high-temperature creep of VT6 titanium alloy under uniaxial and multiaxial stress states are presented. The numerical results are compared with the data of field experiments. Particular attention is paid to the issues of modeling the process of unsteady creep for complex deformation modes, accompanied by the rotation of the main areas of stress tensors, deformations and creep deformations, taking into account the effect of an aggressive environment, which is simulated by preliminary hydrogenation of laboratory samples to various hydrogen concentrations by mass.

It is shown that the developed version of the constitutive relations of the mechanics of a damaged medium allows, with sufficient accuracy for engineering calculations, to describe unsteady creep and long-term strength of structural alloys under multiaxial stress states, taking into account the effect of an aggressive medium (hydrogen corrosion).

About the authors

Leonid A. Igumnov

Samara State Technical University;
Research Institute of Mechanics, National Research Lobachevsky State University of Nizhny Novgorod

Email: igumnov@mech.unn.ru
ORCID iD: 0000-0003-3035-0119
SPIN-code: 1722-9667
Scopus Author ID: 14121358200
ResearcherId: E-3487-2014
http://www.mathnet.ru/person143791

Dr. Phys. & Math. Sci., Professor; Leading Researcher; Dept. of Applied Mathematics and Computer Science; Chief Researcher; Lab. of Simulation of Physical and Mechanical Processes

244, Molodogvardeyskaya st., Samara, 443100, Russian Federation; 23, korp. 6, pr. Gagarina, Nizhny Novgorod, 603022, Russian Federation

Ivan A. Volkov

Research Institute of Mechanics, National Research Lobachevsky State University of Nizhny Novgorod;
Volga State University of Water Transport

Email: pmptmvgavt@yandex.ru
ORCID iD: 0000-0003-1176-4906
SPIN-code: 9835-9970
Scopus Author ID: 57224669962
ResearcherId: J-2846-2017
http://www.mathnet.ru/rus/person160357

Dr. Phys. & Math. Sci., Professor; Chief Researcher; Lab. of Physical and Mechanical Testing of Materials; Head of Dept.; Dept of Hoisting-and-transport Machines and Machine Repair

23, korp. 6, pr. Gagarina, Nizhny Novgorod, 603022, Russian Federation; 5, Nesterova str., Nizhny Novgorod, 603600, Russian Federation

Dmitriy A. Kazakov

Samara State Technical University; Research Institute of Mechanics, National Research Lobachevsky State University of Nizhny Novgorod

Email: kazakov@mech.unn.ru
ORCID iD: 0000-0002-9316-4105
SPIN-code: 6225-3268
Scopus Author ID: 7007110190
ResearcherId: J-4288-2017
http://www.mathnet.ru/rus/person175252

Cand. Techn. Sci.; Researcher; Dept. of Applied Mathematics and Computer Science; Researcher; Lab. of Physical and Mechanical Testing of Materials

244, Molodogvardeyskaya st., Samara, 443100, Russian Federation; 23, korp. 6, pr. Gagarina, Nizhny Novgorod, 603022, Russian Federation

Denis N. Shishulin

Samara State Technical University; Research Institute of Mechanics, National Research Lobachevsky State University of Nizhny Novgorod

Email: shishulindn@gmail.com
ORCID iD: 0000-0002-6527-557X
Scopus Author ID: 54384303100
http://www.mathnet.ru/rus/person175253

Cand. Techn. Sci.; Researcher; Dept. of Applied Mathematics and Computer Science; Researcher; Lab. of Physical and Mechanical Testing of Materials

244, Molodogvardeyskaya st., Samara, 443100, Russian Federation; 23, korp. 6, pr. Gagarina, Nizhny Novgorod, 603022, Russian Federation

Ivan A. Modin

Samara State Technical University; Research Institute of Mechanics, National Research Lobachevsky State University of Nizhny Novgorod

Author for correspondence.
Email: mianet@mail.ru
ORCID iD: 0000-0002-3561-4606
SPIN-code: 4839-8129
Scopus Author ID: 57192279101
ResearcherId: E-9088-2019
http://www.mathnet.ru/rus/person138504

Cand. Techn. Sci.; Researcher; Dept. of Applied Mathematics and Computer Science; Researcher; Lab. of Simulation of Physical and Mechanical Processes

244, Molodogvardeyskaya st., Samara, 443100, Russian Federation; 23, korp. 6, pr. Gagarina, Nizhny Novgorod, 603022, Russian Federation

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