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Effect of Blank Curvature and Thinning on Shell Stresses at Superplastic Forming

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International Scientific Conference Energy Management of Municipal Facilities and Sustainable Energy Technologies EMMFT 2018 (EMMFT-2018 2018)

Part of the book series: Advances in Intelligent Systems and Computing ((AISC,volume 982))

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Abstract

The paper studies the relationship between principal stresses, curvature radii and shell thinning during superplastic forming of sphere-shaped domes from sheet blanks of several Al-Mg alloys and Sn-38% Pb alloy, which is the basis for refining the calculations of the power characteristics of the process. When using the Lame’s superellipse to describe the curvature of the shells, it was established that the principal stresses, especially the tangential stress, depend on the principal curvature radii. It is shown that the intensity of stresses also depends on the thinning of the shells during superplastic forming. It is revealed that the higher the level of superplastic properties of the material of the blank, the less the principal stresses and effective stresses depend on the difference between the principal radii of curvature. It has been established that when calculating the power mode of superplastic forming of shells, it is unacceptable the assumption of uniform thinning of the blank during forming, since the calculation error can reach 130%.

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Acknowledgments

The reported study was funded by RFBR according to the research project №19-08-01252a “Development and verification of inelastic deformation models and thermal fatigue fracture criteria for monocrystalline alloys”. The authors declare that there is no conflict of interest regarding the publication of this paper.

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Authors and Affiliations

  1. Pryazovskyi State Technical University, Street Universytets’ka 7, Mariupol, 87555, Ukraine

    Oleksandr Anishchenko & Volodymyr Kukhar

  2. Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251, St. Petersburg, Russia

    Viktor Artiukh

  3. Moscow State University of Civil Engineering, Yaroslavskoye shosse 26, 129337, Moscow, Russia

    Anatoliy Trebukhin

  4. Tyumen Industrial University, Volodarskogo Street 38, 625000, Tyumen, Russia

    Natalia Zotkina

Authors
  1. Oleksandr Anishchenko
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  2. Volodymyr Kukhar
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  3. Viktor Artiukh
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  4. Anatoliy Trebukhin
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  5. Natalia Zotkina
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Corresponding author

Correspondence to Oleksandr Anishchenko .

Editor information

Editors and Affiliations

  1. Moscow State University of Civil Engineering, Moscow, Russia

    Vera Murgul

  2. Department of Information Engineering, Università degli Studi di Brescia, Brescia, Italy

    Marco Pasetti

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Anishchenko, O., Kukhar, V., Artiukh, V., Trebukhin, A., Zotkina, N. (2020). Effect of Blank Curvature and Thinning on Shell Stresses at Superplastic Forming. In: Murgul, V., Pasetti, M. (eds) International Scientific Conference Energy Management of Municipal Facilities and Sustainable Energy Technologies EMMFT 2018. EMMFT-2018 2018. Advances in Intelligent Systems and Computing, vol 982. Springer, Cham. https://doi.org/10.1007/978-3-030-19756-8_77

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