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Surface elasticity effect on diffusional growth of surface defects in strained solids

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Abstract

This paper presents a theoretical approach that allows to predict the nucleation of surface topological defects under the mechanical loading taking into account the thermodynamic and elastic properties of solid surface as well as its geometrical characteristics. Assuming that the surface atomic layers are thermodynamically unstable under the certain conditions, we obtain the evolution equation describing the kinetics of the relief formation in the case of diffusion mass transport activated by the stress field. The rate of growth of surface defects depends on the field of bulk and surface stresses, which vary with the shape and size of the considered defects. To find the stress state, we use the first-order perturbation solution of a 2D boundary value problem formulated in the terms of the constitutive equations of bulk and surface elasticity. The solution of linearized evolution equation gives the critical values of the ridges size and the initial level of stresses, which stabilize surface profile.

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Correspondence to Sergey Kostyrko.

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The work is supported by Russian Foundation for Basic Research under Grant 18-01-00468.

Communicated by Victor Eremeyev, Holm Altenbach.

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Kostyrko, S., Shuvalov, G. Surface elasticity effect on diffusional growth of surface defects in strained solids. Continuum Mech. Thermodyn. 31, 1795–1803 (2019). https://doi.org/10.1007/s00161-019-00756-4

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Keywords

  • Surface diffusion
  • Surface stress
  • Evolution equation
  • Boundary perturbation method