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Study of Residual Stress Fields Using Indicating Fracture and the Method of Electron Speckle Interferometry

  • MATERIALS MECHANICS: STRENGTH, DURABILITY, SAFETY
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Inorganic Materials Aims and scope

Abstract

The paper deals with applying the gradually growing fracture technique to study inhomogeneous high-gradient residual stress (RS) fields developing in areas of structural inhomogeneity of flat parts (specifically, in welded joints). The method of electronic speckle interferometry (ESI) is used to register the strain response in the form of surface field displacement of the object studied caused by generated and steadily growing incised fracture. It allows registering displacements directly without contact in digital form with high accuracy. The schematic diagrams of a specialized interferometer are described. The features are listed for recording displacement fields caused by the stepwise increase in the fracture length. The use of a return mechanism made it possible to take the test object out of the optical scheme and bring it back to the initial position as soon as the required mechanical operations are completed. A new method is outlined to determine the stress intensity factor (SIF) in fractures operating as RS indicators on the basis of mathematical processing of the tangential displacement fields. The potential of the interactive program operating in the semiautomated mode (in the MATLAB environment) to implement this approach is explained. The accuracy of the RS calculation procedure is estimated on the basis of the mathematical processing of the experimentally obtained RS indicator, i.e., the dependence of SIF on the fracture length. An example is given to apply techniques developed, equipment, and programs to study RS distribution in highly crack-resistant sheets made of 1163T aircraft alloy using the stir welding technique.

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Funding

This work was supported by the Russian Science Foundation, grant no. 20-19-00769.

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Authors and Affiliations

  1. OJSC Dollezhal Institute of Power Engineering, 101000, Moscow, Russia

    S. M. Usov

  2. Blagonravov Institute of Mechanical Engineering, Russian Academy of Sciences, 101990, Moscow, Russia

    I. A. Razumovsky & I. N. Odintsev

Authors
  1. S. M. Usov
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  2. I. A. Razumovsky
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  3. I. N. Odintsev
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Correspondence to S. M. Usov or I. A. Razumovsky.

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The authors declare that they have no conflicts of interest.

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Translated by V. Vetrov

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Usov, S.M., Razumovsky, I.A. & Odintsev, I.N. Study of Residual Stress Fields Using Indicating Fracture and the Method of Electron Speckle Interferometry. Inorg Mater 58, 1571–1577 (2022). https://doi.org/10.1134/S0020168522150146

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  • DOI: https://doi.org/10.1134/S0020168522150146

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