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Multiscale Mesostructure Formation under Impact Loading

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Abstract

Threshold modes of multiscale dynamic deformation were identified for 1561 aluminum alloy by conducting two series of impact tests in the velocity range of 250–750 m/s: under uniaxial deformation and with high-speed penetration of elongated impactors. It was found that the scale of deformation changes at the same strain rate in the spall fracture zone under uniaxial deformation and on the lateral cavity face during impactor penetration. The scale changes due to resonant interaction between oscillations of plastic flow and structural elements of the deformed material. A constitutive equation was derived for multiscale dynamic deformation, and a transport equation was obtained to describe energy exchange between the scale levels. The transition of dynamic deformation to a larger scale level was shown to reduce the resistance to the high-speed penetration of elongated impactors.

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Authors and Affiliations

  1. Institute for Problems in Mechanical Engineering, Russian Academy of Sciences , 199034, St. Petersburg, Russia

    Yu. I. Meshcheryakov, N. I. Zhigacheva, G. V. Konovalov & A. K. Divakov

  2. Central Research Institute of Structural Materials PROMETEY , 193015, St. Petersburg, Russia

    E. P. Osokin

Authors
  1. Yu. I. Meshcheryakov
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  2. N. I. Zhigacheva
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  3. G. V. Konovalov
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  4. A. K. Divakov
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  5. E. P. Osokin
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Correspondence to Yu. I. Meshcheryakov.

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Russian Text © The Author(s), 2019, published in Fizicheskaya Mezomekhanika, 2019, Vol. 22, No. 3, pp. 44–53.

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Meshcheryakov, Y.I., Zhigacheva, N.I., Konovalov, G.V. et al. Multiscale Mesostructure Formation under Impact Loading. Phys Mesomech 23, 231–240 (2020). https://doi.org/10.1134/S1029959920030078

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  • DOI: https://doi.org/10.1134/S1029959920030078

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