By Eyad Masad, Vassilis Panoskaltsis, Linbing Wang
This ''Geotechnical targeted Publication'' comprises papers awarded throughout the symposium on Mechanics of versatile Pavements, a part of the 2005 Joint ASME/ASCE/SES convention on Mechanics and fabrics, held in Baton Rouge, Louisiana on June 1-3, 2005. The papers during this ebook specialize in very important issues in pavement engineering, corresponding to: modeling asphalt concrete reaction on the microstructural point, improvement and numerical implementation of constitutive versions, and experimental characterization of asphalt concrete less than diverse loading and environmental stipulations. additionally they spotlight the numerical implementation of micromechanical types that target setting up the linkage among the homes of asphalt concrete parts and the macroscopic reaction. This complaints is a synthesis of the hot advances in pavement mechanics, and may be necessary to engineers operating with pavement research, layout, and function prediction
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Additional info for Asphalt Concrete : Simulation, Modeling, and Experimental Characterization
Sample text
Baton Rouge, LA 70803. 29 30 ASPHALT CONCRETE (2005) developed a microstructural viscoplastic continuum model for asphalt concrete. The viscoplastic strain rate was defined using Perzyna (1966) flow rule and the linear Drucker-Prager yield function. The aggregate anisotropy was accounted for by introducing a microstructure tensor reflecting the orientation of nonspherical particles. Seibi et al (2001) used a Perzyna type viscoplastic constitutive model with isotropic hardening and Drucker-Prager yield criterion.
Examples of The Effects of Damage Parameter E, and Anisotropy Parameter A on the Stress-Strain Response. 4%/min, and at confining pressures of 0 psi, 15 psi, and 30 psi (Masad et al. 2003). 60%/min and confining pressures similar to those used in the compression tests. Axial and radial stresses and strains were recorded throughout testing. Specimens were loaded up to an axial strain of 8 percent or until failure, whichever occurred first. The data analysis has revealed that damage evolution is a function of confining pressure and effective Viscoplastic strain evp.
Relationship between Dilation Parameter and Anisotropy for d = 1. PARAMETRIC ANALYSIS The model is implemented in FE analysis by using an implicit numerical integration algorithm, called Euler backward method, carried out in a time-step control. The equations that govern the evolution of stress, internal variables, inelastic deformation, and nonlinear parameters are discretized in an incremental format in a user defined material subroutine (UMAT) in the ABAQUS package. The FE analysis is used to conduct a parametric study to illustrate the efficiency of the developed constitutive relationship in capturing key features of the behavior of HMA.