Numerical investigation of residual thermal stresses in welded joints of heterogeneous steels with account of technological features of multi-pass welding

R. A. Krektuleva, O. I. Cherepanov, R. O. Cherepanov

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The paper describes a two-dimensional mathematical model to evaluate stresses in welded joints formed in multi-pass welding of multi-layered steels. The model is based on a system of equations that includes the Lagrange's variational equation of the incremental theory of plasticity and the Biot's variational principle for heat transfer simulation. In the constitutive equations, the changes in the volume which occur as a result of phase transitions can be taken into account. Therefore, the prehistory and impact of thermal processing of materials on macroscopic properties of the medium can be considered. The variational-difference method is used to solve both the heat transfer equation for calculation of the non stationary temperature field and the quasi-static problem of thermoplasticity at each time-step. The two-dimensional problems were solved to estimate the residual thermal stresses (for the case of plane stress or plane strain) during cooling of welds and assessing their impact on strain localization in the heat-affected zone under tensile and compressive loading considering differences in mechanical properties of welded materials. It is shown that at initial stages of the plastic flow, the residual stresses significantly affect the processes of stress concentration and localization of strains in welded joints. To estimate the model parameters and to verify the modeling results, the available experimental data from scientific literature obtained on the basis of the Satoh test for different welding alloys was used.

    Original languageEnglish
    Pages (from-to)244-256
    Number of pages13
    JournalApplied Mathematical Modelling
    Volume42
    DOIs
    Publication statusPublished - 1 Feb 2017

    Fingerprint

    Welded Joints
    Thermal Stress
    Residual Stress
    Welding
    Numerical Investigation
    Thermal stress
    Heat Transfer
    Residual stresses
    Steel
    Welds
    Heat Affected Zone
    Strain Localization
    Lagrange Equation
    Variational Equation
    Plane Stress
    Stress Concentration
    Plane Strain
    Constitutive Equation
    Temperature Field
    Variational Principle

    Keywords

    • Residual stresses
    • Strain localization
    • Structural heterogeneity

    ASJC Scopus subject areas

    • Modelling and Simulation
    • Applied Mathematics

    Cite this

    Numerical investigation of residual thermal stresses in welded joints of heterogeneous steels with account of technological features of multi-pass welding. / Krektuleva, R. A.; Cherepanov, O. I.; Cherepanov, R. O.

    In: Applied Mathematical Modelling, Vol. 42, 01.02.2017, p. 244-256.

    Research output: Contribution to journalArticle

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