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A thermodynamic-based large deformation viscoplastic constitutive relationship for asphalt concrete compaction

Karimi, M. M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijsolstr.2019.01.016
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. This research proposes a large deformation, time-dependent viscoplastic constitutive relationship to enhance the prediction of the compaction degree of asphalt concrete materials under laboratory and field conditions. A large-deformation thermodynamic-based framework is presented. The Helmholtz free energy and rate of energy dissipation functions were assumed to derive rate-dependent constitutive relationships to relate multi-axial state of stresses to the recoverable and non-recoverable deformation response of asphalt concrete during compaction. A straightforward method that allows the calibration of the proposed model against laboratory compaction data (e.g., data from Superpave Gyratory Compactor; SGC) is presented. Numerical algorithms associated with the proposed constitutive relationship were implemented in the finite element (FE) code Abaqus via the user material subroutine UMAT. The model is calibrated against SGC deformation data at different number of gyrations (time). The calibrated model was utilized to predict the field compaction of asphalt concrete. Comparisons of the model predictions and field measurements showed that the model is capable of predicting the compaction of asphalt concrete materials both in the laboratory and in the field. © 2019
  6. Keywords:
  7. Asphalt concrete compaction ; Constitutive modeling ; Finite element ; Large deformation ; Superpave gyratory compactor (SGC) ; Thermodynamic farmework ; ABAQUS ; Asphalt concrete ; Concretes ; Constitutive models ; Deformation ; Energy dissipation ; Finite element method ; Forecasting ; Free energy ; Superpave ; Concrete compaction ; Constitutive relationships ; Finite element codes ; Multi-axial state of stress ; Numerical algorithms ; Straight-forward method ; Superpave gyratory compactors ; User material subroutine ; Compaction
  8. Source: International Journal of Solids and Structures ; Volume 165 , 2019 , Pages 192-216 ; 00207683 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0020768319300253