A modified Mazars damage model with energy regularization

Arruda M.R.T.; Pacheco J.; Castro L.M.S.; Julio E.

Key information

Authors:

Arruda M.R.T. (Mário Rui Tiago Arruda); Pacheco J.; Castro L.M.S. (Luís Manuel Soares dos Santos Castro); Julio E. (Eduardo Nuno Brito Santos Júlio)

Published in

01/01/2022

Abstract

This paper presents a modified Mazars damage model, based on a strain formulation, for the physically nonlinear analysis of concrete structures. The main objective is to propose a modified damage model, in which both tension and compression damage evolution laws are regularized using a classical fracture energy methodology. The original loading functions are maintained, including their thermodynamic consistencies. The most relevant modification of the model is introduced in the damage evolutions laws, which are updated in order to produce similar stress-strain relations to those presented in fib Model Code 2010. The softening branch under both compressive and tensile strains is regularized with fracture energy. The damage model is then benchmarked with classical experimental and numerical tests considering monotonic loadings. The new constitutive relation was implemented in the commercial software ABAQUS via user subroutine UMAT. Research needs towards a definition of a generalized damage model with energy regularization are discussed and presented.