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<p>The focus of this work is on the time-dependent creep behavior of a rotating multi-layered disk with imperfect bonding and variable thickness composed of functionally graded magneto-electro-elastic (FGMEE) under axisymmetric thermal&#xa0;and humidity fields, a centrifugal body force, and electric and magnetic potentials. Norton’s law was considered as the creep basic model, where the creep parameters are power functions of radius. The electrical, mechanical, magnetic, and hygrothermal characteristics of the material change as functions through the radial direction. A differential equation involving creep strains was developed utilizing equilibrium, electrostatic, and magnetostatic equations. Firstly, the creep strain was eliminated, and the primitive stresses, displacement, and electromagnetic potentials were derived analytically. Next, employing Prandtl-Reuss relations, an analytical solution was formulated to determine the creep stress rate and rate of electromagnetic potentials under steady-state hygrothermal conditions. Finally, in several numerical examples, the history of various fields was determined utilizing an iterative approach. The results show the considerable effect of grading index, imperfect bonding, hygrothermal loading, and boundary conditions on the response of the disk.</p>

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Creep stress redistribution of FGMEE rotating variable thickness multi-layered disk with imperfect bonding in hygrothermal environmental condition

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • M. Saadatfar,
  • M. A. Babazadeh,
  • Y. Iravani

摘要

The focus of this work is on the time-dependent creep behavior of a rotating multi-layered disk with imperfect bonding and variable thickness composed of functionally graded magneto-electro-elastic (FGMEE) under axisymmetric thermal and humidity fields, a centrifugal body force, and electric and magnetic potentials. Norton’s law was considered as the creep basic model, where the creep parameters are power functions of radius. The electrical, mechanical, magnetic, and hygrothermal characteristics of the material change as functions through the radial direction. A differential equation involving creep strains was developed utilizing equilibrium, electrostatic, and magnetostatic equations. Firstly, the creep strain was eliminated, and the primitive stresses, displacement, and electromagnetic potentials were derived analytically. Next, employing Prandtl-Reuss relations, an analytical solution was formulated to determine the creep stress rate and rate of electromagnetic potentials under steady-state hygrothermal conditions. Finally, in several numerical examples, the history of various fields was determined utilizing an iterative approach. The results show the considerable effect of grading index, imperfect bonding, hygrothermal loading, and boundary conditions on the response of the disk.