@article{1f6b478206e943bf8d7c56540c819367,
title = "Cyclic Hardening-relaxation viscoplasticity model for asphalt concrete materials",
abstract = "A cyclic hardening-relaxation model is proposed that significantly enhances the prediction of the viscoplastic (VP) strain of asphalt concrete under cyclic compressive-loading conditions at high temperatures. The hardening-relaxation mechanism is physically tied to the changes in the material's microstructure during the rest period. A memory surface that memorizes the viscoplastic deformation history is defined in the viscoplastic strain space as the general initiation and evolution criteria for the hardening-relaxation mechanism. The proposed model is coupled to the classical Perzyna-type viscoplastic model and Schapery's nonlinear viscoelastic model, and the associated numerical algorithms are implemented in the finite element software ABAQUS through the user-defined material subroutine UMAT. Model predictions show that the proposed model predicts well both the axial and radial viscoplastic responses of asphalt concrete subjected to the cyclic creep tests at various loading times, unloading times, confinement levels, and loading scenarios.",
keywords = "Asphalt concrete, Hardening-relaxation, Pulse time and rest time effects, Viscoelasticity, Viscoplasticity",
author = "Darabi, {Masoud K.} and {Abu Al-Rub}, {Rashid K.} and Masad, {Eyad A.} and Little, {Dallas N.}",
note = "Funding Information: The authors acknowledge the financial support provided by the Asphalt Research Consortium through the U.S. Federal Highway Administration. R. K. Abu Al-Rub and E. Masad also would like to acknowledge the financial support provided by Qatar National Research Fund (QNRF) through the National Priority Research Program project No. 08-310-2-110, which supports the work of the viscoelastic-viscoplastic model development. Finally, the authors acknowledge R. KimfromNorth Carolina State University for providing the experimental data used in this study. Funding Information: The authors acknowledge the financial support provided by the Asphalt Research Consortium through the U.S. Federal Highway Administration. R. K. Abu Al-Rub and E. Masad also would like to acknowledge the financial support provided by Qatar National Research Fund (QNRF) through the National Priority Research Program project No. 08-310-2-110, which supports the work of the viscoelastic-viscoplastic model development. Finally, the authors acknowledge R. Kim from North Carolina State University for providing the experimental data used in this study. Publisher Copyright: {\textcopyright} 2013 American Society of Civil Engineers.",
year = "2013",
doi = "10.1061/(ASCE)EM.1943-7889.0000541",
language = "British English",
volume = "139",
pages = "832--847",
journal = "Journal of Engineering Mechanics",
issn = "0733-9399",
publisher = "American Society of Civil Engineers (ASCE)",
number = "7",
}