1. Creep constitutive models for viscoelastic materials based on fractional derivatives
- Author
-
Huanying Xu and Xiaoyun Jiang
- Subjects
Best fitting ,Estimation theory ,Constitutive equation ,Mathematical analysis ,02 engineering and technology ,Inverse problem ,01 natural sciences ,Viscoelasticity ,010305 fluids & plasmas ,Fractional calculus ,Nonlinear programming ,Computational Mathematics ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Computational Theory and Mathematics ,Creep ,Modeling and Simulation ,0103 physical sciences ,Mathematics - Abstract
To describe the time-dependent creep behavior of viscoelastic material, fractional constitutive relation models which are represented by the fractional element networks are studied. Three sets of creep experimental data for polymer and rock are employed to demonstrate the effectiveness of these fractional derivative models. The corresponding constrained problem of nonlinear optimization is solved with an interior-point algorithm to obtain best fitting parameters of these fractional derivative models. The comparison results of measured values and calculated values versus time are displayed through graphics. The results demonstrate that the fractional PoyntingThomson model is optimal in simulating the creep behavior of viscoelastic materials. And it also shows that the interior-point method is effective in the inverse problem to estimate parameters of fractional viscoelastic models.
- Published
- 2017