Abstract
Two higher-order fractional viscoelastic material models consisting of the fractional Voigt model (FVM) and the fractional Maxwell model (FMM) are considered. Their higher-order fractional constitutive equations are derived due to the models’ constructions. We call them the higher-order fractional constitutive equations because they contain three different fractional parameters and the maximum order of equations is more than one. The relaxation and creep functions of the higher-order fractional constitutive equations are obtained by Laplace transform method. As particular cases, the analytical solutions of standard (integer-order) quadratic constitutive equations are contained. The generalized Mittag–Leffler function and H-Fox function play an important role in the solutions of the higher-order fractional constitutive equations. Finally, experimental data of human cranial bone are used to fit with the models given by this paper. The fitting plots show that the models given in the paper are efficient in describing the property of viscoelastic materials.
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Liu, J.G., Xu, M.Y. Higher-order fractional constitutive equations of viscoelastic materials involving three different parameters and their relaxation and creep functions. Mech Time-Depend Mater 10, 263–279 (2006). https://doi.org/10.1007/s11043-007-9022-9
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DOI: https://doi.org/10.1007/s11043-007-9022-9
Keywords
- Viscoelasticity
- Higher-order fractional constitutive equation
- Fractional calculus
- Relaxation
- Creep
- Mittag–Leffler function