Page 239 - MODELING OF ASPHALT CONCRETE

Unified Disturbed State Constitutive Modeling of Asphalt Concr ete 217

FIGURE 8-6 Schematic of softening and healing (stiffening) response in DSC.

If it is assumed that the damaged part carries no stress at all, Eq. (8-1) reduces to the
conventional continuum damage model (Kachanov 1986). However, such a model does
not allow for the interaction between the damaged and undamaged parts and can suffer
from deficiencies like spurious mesh dependence. Many workers have introduced external
“enhancements” in the damage model (e.g., Bazant 1994; Bazant and Cedolin 1991) to
allow for the interaction. The DSC model allows the interaction implicitly, and possesses a
number of advantages compared with the other (enhanced) models (Desai 2001).