Creep and Long-Term Strength of Metals

Локощенко, А. М.

doi:10.1201/b22242

Cited by 34 publications

(12 citation statements)

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“…To analyze the process of diffusion of the active medium into the material, an approximate method is proposed for solving the diffusion equation based on the introduction of a diffusion front propagating from the surface of a plate or shell (hereinafter, the plate and the shell are designated as a typical element) [2,5,6]. This approach allows one to divide the entire cross section of a typical element into perturbed (where the medium has already penetrated into the material) and unperturbed regions (where there is no penetration of the medium yet) and then track the movement of the boundary between these regions in time.…”

Section: Diffusion Of An Active Medium An Approximate Methods For Solving the Diffusion Equationmentioning

confidence: 99%

“…The influence of the active medium can be determined both by the diffusion penetration of its elements into the material, and by the corrosive effect, which is inherent in active chemical processes of interaction of working and / or environment with materials of structural elements. Of particular importance is the study of such processes during high-temperature longterm loading of metallic materials and structures under creep conditions [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Long-Term Destruction of Typical Structural Elements Influenced By an Active Medium and Unsteady Loading

Fomin¹,

Fomina²

2021

World Congress on Mechanical, Chemical, and Material Engineering

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The long-term destruction of the shell and plate during creep in the active medium under the conditions of an unsteady complex stress state is investigated. The diffusion process of penetration of the active medium into the material is considered. The influence of the medium on the time to fracture is taken into account by introducing a function of the integral average concentration of the medium into the constitutive and kinetic linear fractional relationships. Comparison of the times to failure using the scalar and vector damage parameters is carried out. The features of using a linear fractional model to describe long-term fracture processes are determined.

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Section: Diffusion Of An Active Medium An Approximate Methods For Solving the Diffusion Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Long-Term Destruction of Typical Structural Elements Influenced By an Active Medium and Unsteady Loading

Fomin¹,

Fomina²

2021

World Congress on Mechanical, Chemical, and Material Engineering

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“…The methods of the probability theory and mathematical statistics, numerical integration methods and the method of random outliers elimination from experimental data were used [17]. Creep and damage of the material are described by the system of kinetic equations [1].…”

Section: Research Materials and Methodsmentioning

confidence: 99%

Development of a stochastic model of failure of structural materials in creep at hardening stage

Doyar

Poshyvalov

2016

EEJET

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Розроблено метод прогнозування довготривалої міцності конструкційних матеріалів при ізотермічній повзучості в умовах одноосного стаціонарного навантаження з урахуванням стадії зміцнення. Запропоновано стохастичну модель руйнування при повзучості і методику ідентифікації констант повзучості матеріалу. Проведено розрахунок параметрів стохастичної моделі, який підтверджує її адекватність експериментальним данимКлючові слова: руйнування, ізотермічна повзучість, пошкодження матеріалу, час до руйнування, імовірнісний розподіл Разработан метод прогнозирования длительной прочности конструкционных материалов при изотермической ползучести в условиях одноосного стационарного нагружения с учетом стадии упрочнения. Предложена стохастическая модель разрушения при ползучести и методика идентификации констант ползучести материала. Проведен расчет параметров стохастической модели, который подтверждает её адекватность экспериментальным даннымКлючевые слова: разрушение, изотермическая ползучесть, поврежденность материала, время до разрушения, вероятностное распределение UDC 539.376

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“…As a connection between the components of the stress tensors and creep strain rates, the hypothesis of proportionality of the corresponding deviators (see, for example, [4]) is accepted:…”

Section: Free Deformation Of the Membrane Under Creep Conditions (First Stage)mentioning

confidence: 99%

“…Of particular interest is the study of the creep of the considered membrane inside a rigid matrix. In monographs [3,4], a cycle of creep problems of such a membrane inside a rigid matrix is studied; matrices of various shapes are consideredwedge-shaped, curved and rectangular.…”

Section: Introductionmentioning

confidence: 99%

Steady-State Creep of a Long Narrow Rectangular Membrane inside a Low Rigid Matrix with a Variable Transverse Pressure

Локощенко¹,

Fomin²,

Akhmetgaleev³

2021

World Congress on Mechanical, Chemical, and Material Engineering

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The problem of the steady-state creep of a long narrow rectangular membrane inside a rigid matrix with a proportional dependence of the transverse pressure on time is studied. It considers a long rigid matrix of rectangular section, in which the height is no more than half the width. Two variants of the conditions of contact between the membrane and the matrix are considered -ideal sliding and adhesion. In this paper, three stages of membrane creep are investigated. At the first stage, the membrane is deformed under the steady creep conditions up to the moment it touches the transverse wall of the matrix. The second stage ends when the membrane touches the longitudinal walls of the matrix. At the third stage, the membrane contacts the matrix along the transverse and longitudinal sides. The calculation is carried out until the time of almost complete adhesion of the membrane to the matrix. A comparison is made of these time values under different contact conditions and levels of proximity of the membrane to the matrix.

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Creep and Long-Term Strength of Metals

Cited by 34 publications

References 0 publications

Simulation of Long-Term Destruction of Typical Structural Elements Influenced By an Active Medium and Unsteady Loading

Simulation of Long-Term Destruction of Typical Structural Elements Influenced By an Active Medium and Unsteady Loading

Development of a stochastic model of failure of structural materials in creep at hardening stage

Steady-State Creep of a Long Narrow Rectangular Membrane inside a Low Rigid Matrix with a Variable Transverse Pressure

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