#### Document Type

Original Article

#### Subject Areas

Mathematics, Statistics, Computer Science, Physics and Astronomy

#### Keywords

Thermo-magnetoelasticity; Cartesian polynomials; nearly- circular cross-section; magnetic vector potential; semi-analytical solution

#### Abstract

Harmonic Cartesian polynomial and rational functions are used to obtain a semi-analytical solution to the uncoupled, two-dimensional problem of thermo-magnetoelasticity for a long, transversely isotropic elastic cylinder of nearly-circular normal cross-section carrying an axial, steady electric current. Numerical results and plots are provided and discussed. Comparison with the case of a circular cross-section allows to assess the in uence of imperfection of the cross-sectional shape on the quantities of practical interest. The effect of dependence of the magnetic permeability on strain is investigated. We use the magnetic vector potential which is parallel to the axis of the cylinder. The mathematical problem reduces to the determination of five harmonic functions, interrelated by a set of boundary conditions. Two of these harmonic functions combine to yield Airy's stress function in the cross-sectional domain in case the mechanical problem is solved in stresses. A third harmonic function enters in the formulation of the thermal problem for temperature distribution. The two remaining harmonic functions enter in the description of the vector potential distribution inside the conductor and in the surrounding region. The results and application in calculating the deformation of straight central sections of electric conductors in various instruments, in particular busbars in electric power stations, and the stresses induced in them due to the electric current.

#### How to Cite This Article

El Sheshtawy, Sayed; Obada, A.-S.; Abu-Dina, Moustafa; and Ghaleb, Ahmed
(2020)
"Cartesian harmonic polynomials for a problem of deformation of a long, current-carrying elastic cylindrical conductor of nearly-circular normal cross-section,"
*Al-Azhar Bulletin of Science*: Vol. 31:
Iss.
2, Article 5.

DOI: https://doi.org/10.21608/absb.2020.40436.1081