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A thermo-viscoelastic-viscoplastic-viscodamage constitutive model for asphaltic materials

Author(s): Darabi, MK (Darabi, Masoud K.); Abu Al-Rub, RK (Abu Al-Rub, Rashid K.); Masad, EA (Masad, Eyad A.); Huang, CW (Huang, Chien-Wei); Little, DN (Little, Dallas N.) Source: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 48 (1): 191-207 JAN 1 2011

A temperature-dependent viscodamage model is proposed and coupled to the temperature-dependent Schapery s nonlinear viscoelasticity and the temperature-dependent Perzyna s viscoplasticity constitutive model presented in Abu Al-Rub et al (2009) and Huang et al (in press) in order to model the nonlinear constitutive behavior of asphalt mixes The thermo-viscodamage model is formulated to be a function of temperature total effective strain and the damage driving force which is expressed in terms of the stress invariants of the effective stress in the undamaged configuration This expression for the damage force allows for the distinction between the influence of compression and extension loading conditions on damage nucleation and growth A systematic procedure for obtaining the thermo-viscodamage model parameters using creep test data at different stress levels and different temperatures is presented The recursive-iterative and radial return algorithms are used for the numerical implementation of the nonlinear viscoelasticity and viscoplasticity models respectively whereas the viscodamage model is implemented using the effective (undamaged) configuration concept Numerical algorithms are imple mented in the well-known finite element code Abaqus via the user material subroutine UMAT The model is then calibrated and verified by comparing the model predictions with experimental data that include creep-recovery creep and uniaxial constant strain rate tests over a range of temperatures stress levels and strain rates It is shown that the presented constitutive model is capable of predicting the nonlinear behavior of asphaltic mixes under different loading conditions (C) 2010 Elsevier Ltd All rights reserved.

Author(s):  Darabi, MK (Darabi, Masoud K.); Abu Al-Rub, RK (Abu Al-Rub, Rashid K.); Masad, EA (Masad, Eyad A.); Huang, CW (Huang, Chien-Wei); Little, DN (Little, Dallas N.) 
Source:  INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 48 (1): 191-207 JAN 1 2011 
Language:  English 
Document Type:  Article 
Author Keywords:  Continuum damage mechanics; Viscodamage; Nonlinear viscoelasticity; Viscoplasticity; Finite element implementation 
Keywords Plus: CONTINUUM DAMAGE MODEL; GROWING DAMAGE; ANISOTROPIC VISCODAMAGE; GRADIENT THEORY; CONCRETE; BEHAVIOR; DEFORMATION; COMPOSITES; MIXTURES; MEDIA
Addresses:  [Darabi, Masoud K.; Abu Al-Rub, Rashid K.; Masad, Eyad A.; Huang, Chien-Wei; Little, Dallas N.] Texas A&M Univ, Zachry Dept Civil Engn, College 
Funding Agency:  Authors acknowledge the financial support provided by Qatar National Research Fund (QNRF) Federal Highway Administration through the Asphalt Research Consortium and Southwest University Transportation Center 
Publisher:  PERGAMON-ELSEVIER SCIENCE LTD 
Publisher Address:  THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND 
ISSN:  0020-7683 
29-char Source Abbrev.:  INT J SOLIDS STRUCT 
ISO Source Abbrev.:  Int. J. Solids Struct. 
Subject Category:  Mechanics 
ISI Document Delivery No.:  686BM 
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