Bi-modularity representation proposal of quasi-brittle materials through isotropic degradation constitutive model

Resumo

Quasi-brittle materials are governed by different stress-strain laws when subjected to tension and com-
pression, so this characteristic is called bi-modularity. The classical Mazars model represents the behavior of

bimodular materials through damage variables that comprises degradation in compression and tension. These vari-
ables are obtained through an exponential type law based on a single parameter to limit the material elastic domain

and a unique equivalent strain. In this scenario, a new approach is presented. The proposed model considers
modifications in the damage calculation, employing independent damage evolution laws and equivalent strain for
tension and compression. This modification aims a better representation of the realistic behavior of quasi-brittle
materials, especially the correlation between the model parameters and the material properties.