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Debonding of coarse aggregates from the surrounding matrix is considered as a major energy dissipative mechanism which affects the mechanical behavior of cementitious composites like concrete. In the present work, a micromechanical model has been developed to study the effect of debonding on the macroscopic behavior of concrete. Concrete is modeled as a two phase composite and a linear softening law has been used to characterize the interface between the phases. Numerical analysis is carried out to obtain the macroscopic stress-strain behavior under uniaxial tension. A parametric study is conducted to study how the various material properties of the individual phases affect the overall stress-strain behavior of concrete, with special emphasis on the post-peak softening.

Micromechanical Characterization of Energy Dissipative Mechanisms in Fracture Process Zone