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2020 | OriginalPaper | Chapter

Creep and Long-Term Strength of Structures

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Abstract

The issue of evaluating strength and service life is discussed as applied to structures performance of which is characterized by multi-parametric nonstationary thermal-mechanical effects. The major degradation mechanisms of structural materials are considered. In the framework of mechanics of damaged media, a mathematical model describing the processes of viscoplastic deformation and damage accumulation due to creep is developed. The results of numerical simulation of the carrying capacity of a power plant reactor vessel in the event of a hypothetical emergency are presented. A number of characteristic features accompanying the deformation and failure processes connected with the time and place of macrocrack nucleation, the stress-strain state history and damage degree are given. By comparing numerical and experimental results we can conclude that the proposed constitutive relations of MDM adequately describe degradation of the initial strength properties of the material in terms of creep and long-term strength.

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Metadata
Title
Creep and Long-Term Strength of Structures
Authors
Ivan Volkov
Leonid Igumnov
Svetlana Litvinchuk
Copyright Year
2020
DOI
https://doi.org/10.1007/978-3-030-47883-4_54

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