Abstract
The issue of evaluating service life of engineering objects, the exploitation properties of which are characterized by multi-parametric nonstationary thermal-mechanical effects, is discussed. The main degradation mechanisms of structural materials (metals and their alloys) are considered. To evaluate the stressed-strained state (SSS) and fatigue life of materials and structures from the modern viewpoint of mechanics of damaged media (MDM), a mathematical model is developed which describes processes of cyclic thermoplastic deformation and fatigue damage accumulation in structural alloys under multiaxial non-proportional paths of combined thermal-mechanical loading.
The reliability of the defining relations of MDM for low-cycle modes of thermal-cyclic loading is corroborated by comparing the numerical and experimental results on fatigue life of a compact notched specimen in the conditions of non-uniaxial stressed state under block-type modes of thermal-cyclic loading. The results of numerically modeling fatigue life of a compact specimen with a blunted notch are given for two loading histories. It is shown that several cycles of intensive loading at the beginning of the deformation history can result in that the rule of linear summation of damage may yield inaccuracies of both conservative and non-conservative character. The effect of the inclination angle of cooling channels on thermal-cyclic life of combustion chamber tubes has been numerically analyzed. It is shown that the MDM model adequately describes the test data and can be used for evaluating thermal-cyclic life of materials and structures under multiaxial non-proportional paths of thermal-cyclic loading.
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Acknowledgements
The work is financially supported by the Federal Targeted Program for Research and Development in Priority Areas of Development of the Russian Scientific and Technological Complex for 2014–2020 under the contract No. 14.578.21.0246 (unique identifier RFMEFI57817X0246).
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Volkov, I.A., Igumnov, L.A., Litvinchuk, S.Y., Vorobtsov, I.V., Grigoryev, M.V. (2019). Model of Damaged Medium for Describing Fatigue Fracture of Materials and Structures. In: Abdel Wahab, M. (eds) Proceedings of the 7th International Conference on Fracture Fatigue and Wear. FFW 2018. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0411-8_12
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DOI: https://doi.org/10.1007/978-981-13-0411-8_12
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