Metallurgy | |

ArticleName | Experimental and mathematical methods for calculation of residual stresses in production of welded pipes |

DOI | 10.17580/chm.2021.07.03 |

ArticleAuthor | A.P. Kolikov, S. O. Ti, T. Yu. Sidorova |

ArticleAuthorData | National University of Science and Technology “MISiS” (Moscow, Russia): |

Abstract | The results of physical and mathematical modeling of the stress-strain state of metal and residual stresses during plastic deformation of a sheet blank and welding of large-diameter pipes are generalized. One of the analytical methods for calculation of residual stresses during elastoplastic deformation of a rectangular bar and a wide strip is described. From the standpoint of continuum mechanics, it is shown that under the action of a bending moment, tensile stresses appear in the outer layers, and compressive stresses appear in the inner layers, which change sign during unloading and residual stresses remain in the metal, compressive stresses in the outer layers, and tensile stresses on the inner surface. As a result of the studies carried out, the authors for the first time obtained a picture of residual stresses distribution and found that at each technological operation of the formed pipe billet after its completion, tangential and axial residual tensile stresses σ |

keywords | Mathematical models, sheet blank forming, large diameter pipes, pressing tool, assembly and welding mill, pipe expansion |

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Language of full-text | russian |

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