Igor Andrianov
Some papers

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Many of my monographs and papers are available via my ResearchGate page.
Reprints of my papers for individual use are available upon request.
Preprints of some papers in pdf format are available via links below.

Preprints
• Andrianov I.V., Awrejcewicz J. and Barantsev R.G. (2003) Asymptotic Approaches in Mechanics: New Parameters and Procedures. Appl. Mech. Rev., vol.56, No 1, pp.87-110 .
  This survey is devoted to recent achievements in the field of asymptotic approaches. Here we consider the asymptotics in relation to completely new and sometimes unexpected parameters. Some procedures leading to improvement and isolation of the essential analytical structure of the perturbation series are presented. It has been also shown that a lot of relatively simple at first glance problems of the perturbation theory is still far from a complete solution. Different asymptotic techniques to solve the same problem and their influence on the results are briefly illustrated and discussed. This review paper contains 310 references. [Download]
  
  
• Andrianov I.V., Danishevs’kiy V.V. and Weichert D. (2002) Asymptotic Determination of Effective Elastic Properties of Composite Materials with Fibrous Square-Shaped Inclusions. Eur. J. Mech. A/Solids, vol. 21, N 6, pp. 1019-1036 .
  We propose an asymptotic approach for evaluating effective elastic properties of two-components periodic composite materials with fibrous inclusions. We start with a nontrivial expansion of the input elastic boundary value problem by ratios of elastic constants. This allows to simplify the governing equations to forms analogous to the transport problem. Then we apply an asymptotic homogenization method, coming from the original problem on a multi-connected domain to a so called cell problem, defined on a characterizing unit cell of the composite. If the inclusions’ volume fraction tends to zero, the cell problem is solved by means o f a boundary perturbation approach. When on the contrary the inclusions tend to touch each other we use an asymptotic expansion by non-dimensional distance between two neighbouring inclusions. Finally, the obtained “limiting” solutions are matched via two-point Padé approximants. As the results, we derive uniform analytical representations for effective elastic properties. Also local distributions of physical fields may be calculated. In some partial cases the proposed approach gives a possibility to establish a direct analogy between evaluations of effective elastic moduli and transport coefficients. As illustrative examples we consider transversally-orthotropic composite materials with fibres of square cross section and with square checkerboard structure. The obtained results are in good agreement with data of other authors. [Download]
  
  
• Andrianov I.V. and Awrejcewicz J. (2001) New Trends in Asymptotic Approaches: Summation and Interpolation Methods. Applied Mechanics Review, V.54, No.1, pp.69-92.
  In this paper, we present in some detail new trends in application of asymptotic techniques to mechanical problems. First we consider the various methods which give a possibility to extend a space of application of perturbation series and hence to omit their local character. [Download]
  
  
• Tokarzewski S., Andrianov I. (2001) Effective coefficients for real non-linear and fictitious linear temperature-dependent periodic composites. International Journal of Non-Linear Mechanics, V.36, 187-195.
  It has been proved that the effective conductivities for non-linear, temperature-dependent composites and the so-called linear, fictitious ones coincides. Due to the fact all homogeneous methods, exact or approximate, developed previously for linear composites apply immediately to non-linear, temperature-dependent ones. Numerical example illustrating the results obtained is provided. [Download]
  
  
• Andrianov I., Awrejcewicz J. (2000) Method of small and large delta in nonlinear dynamics – a comparative analysis. Nonlinear Dynamics, V.23, 57-66.
  New asymptotic approaches for dynamical systems containing a power nonlinear term xⁿ are proposed and analysed. Two natural limiting cases are studied: n tends to the unit and n tends to infinity. In the first case, the “small delta method” (SDM) is used and its applicability for different dynamical  problems is outlined. For the second case a new asymptotic approach is proposed (conditionally we call it “large delta method” - LDM). Error estimations lead to the following conclusion: the LDM may be used, even for small n, whereas the SDM has a narrow application area. Both of the discussed approaches overlap all values of the parameter n.  [Download]
  
  
• Andrianov I., Danishevs’kyy V., Tokarzewski S. (2000) The method of quasifractional approximants in application to mechanical problems. Theoretical Foundations of Civil Engineering, V.8, 371-376.
  Practically any physical or mechanical problem, which includes a variable parameter epsilon, can be approximately solved as epsilon approaches zero or infinity. How can this “limiting” information be used in the study of the system at intermediate values of epsilon ? In some instances the answer may be given by two-point Padé approximants (PA). However, one of the main shortages of PAs is related to the presence of logarithmic or other complicated components in numerous asymptotic expansions, which do not allow rational approximations. Such difficulties are essential for the most of real mechanical problems. In order to overcome them so called method of quasifractional approximants (QA) may be used. It allows one to obtain approximate solutions in closed analytical forms, valid for all values of governing parameters. Here we introduce QAs for the Thomas-Fermi boundary value problem and for effective transport properties of regular arrays of spheres. [Download]
   
• Andrianov I., Danishevs’kyy V., Tokarzewski S. (2000) Quasifractional approximants for effective conductivity of regular arrays of spheres. Archives of Mechanics, No.2, 319-327.
  We study the effective heat conductivity of regular arrays of perfectly conducting spheres embedded in a matrix with the unit conductivity. Quasifractional approximants allow us to derive an approximate analytical solution, valid for all values of the spheres volume fraction. As the bases we use a perturbation approach for small spheres and an asymptotic solution for large ones. Three different types of the spheres space arrangement (simple, body and face centred cubic arrays) are considered. Obtained results give a good agreement with numerical data. [Download]
   
• Andrianov I., Starushenko G., Danishevs’kyy V., Tokarzewski S. (1999) Homogenization procedure and Padé approximants for effective heat conductivity of composite materials with cylindrical inclusions having square cross section. Proc. R. Soc. Lond. A, V.455, 3401-3413.
  An analytical solution, describing the effective heat conductivity of composite materials with a periodic array of cylindrical inclusions with square cross section, has been obtained by means of asymptotic methods and Padé approximants for any values of inclusions concentration and conductivity. [Download]

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