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A Nonlinear Fractional Viscoelastic-Plastic Creep Model of Asphalt Mixture
| Content Provider | MDPI |
|---|---|
| Author | Zhang, Yongjun Liu, Xiu Yin, Boyuan Luo, Wenbo |
| Copyright Year | 2021 |
| Description | The mechanical behavior of asphalt mixture under high stresses presents nonlinear viscoelasticity and permanent deformation. In this paper, a nonlinear fractional viscoelastic plastic (NFVEP) creep model for asphalt mixture is proposed based on the Nishihara model, with a Koeller spring-pot replacing the Newton dashpot. The NFVEP model considers the instantaneous elasticity, viscoelasticity with damage and time-hardening viscoplasticity with damage concurrently, and the viscoelastic response is modeled by fractional derivative viscoelasticity. To verify the model, uniaxial compressive creep tests under various stresses ranging from 0.4 MPa to 0.8 MPa were carried out at room temperature. The NFVEP model predictions are in good agreement with the experiments. The comparison with the modified Nishihara model and the Burgers model reveals the advantages of the NFVEP model. The results show that the NFVEP model, with the same set of parameters, can not only describe the primary and steady-state creep stages of asphalt mixture under low stress levels but also the whole creep process, including the tertiary creep stage, of asphalt mixture under high stress levels. |
| Starting Page | 1278 |
| e-ISSN | 20734360 |
| DOI | 10.3390/polym13081278 |
| Journal | Polymers |
| Issue Number | 8 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-04-14 |
| Access Restriction | Open |
| Subject Keyword | Polymers Mechanical Engineering Asphalt Mixture Nonlinear Creep Damage Fractional Derivative Viscoelasticity Viscoplasticity |
| Content Type | Text |
| Resource Type | Article |
