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Experimental Study on Cyclic Creep of Pipes

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Deformation of rectilinear elements of Du 200 pipeline made of 20 steel under cyclic loading with internal pressure has been studied experimentally. Tests were carried out on a pneumohydraulic bench under conditions close to plane stress state, room temperature, and cycle asymmetry under soft loading mode (stress control). Circumferential and axial strains were recorded at three points of a diametrical section located in the middle of the element under study. Two tubular elements were tested at different values of maximum and amplitude stresses based on 100 cycles of loading. Deformation curves (cyclic creep) of tubes in a circular direction have been obtained, the character of which is significantly non-uniform in comparison with deformation of laboratory specimens. It is shown that even a slight increase in maximum (by 4%) and amplitude (by 8%) stresses significantly (up to 50%) increases the cyclic creep strains in the circular direction. Such growth of deformations can be explained by a peculiarity of 20 steel, the deformation diagram of which in the elastoplastic transition area contains a yield point, which determines intensive deformation of the material. Fixed plastic deformations in the axial direction are more than an order smaller than circular ones, and with increasing loading cycles, they change insignificantly and coincide for the two studied tubular elements.

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Authors and Affiliations

  1. Pisarenko Institute of Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    M. V. Borodii, M. P. Adamchuk, V. O. Stryzhalo & Z. S. Yaskovets’

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  1. M. V. Borodii
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  2. M. P. Adamchuk
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  3. V. O. Stryzhalo
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  4. Z. S. Yaskovets’
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Correspondence to M. V. Borodii.

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Translated from Problemy Mitsnosti, No. 3, pp. 39 – 48, May – June, 2022.

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Borodii, M.V., Adamchuk, M.P., Stryzhalo, V.O. et al. Experimental Study on Cyclic Creep of Pipes. Strength Mater 54, 378–386 (2022). https://doi.org/10.1007/s11223-022-00413-3

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