Investigation of chemical corrosion influence on the mechanical behavior of rock-like materials by a micromechanics-based constitutive model

Abstract

The plastic deformation and damage generated during external loading or chemical reactions under corrosive environments have a significant influence on the macroscopic mechanical behavior of heterogeneous materials. In this work, a multiscale elastoplastic damage constitutive model is constructed for porous materials with and without chemical corrosion. Due to the external loading or the chemical corrosion, the material microstructure is changed. In this work, particular attention has been paid to the effect of material microstructure on the overall mechanical of heterogeneous material. The influence of porosity has been explicitly taken into account by a macroscopic yield criterion and it is treated as a damage factor. The asymmetric property of geomaterial between tension and compression has been considered by adopting the Drucker–Prager type criterion. By integrating the damage such as the new pores generated during the loading and also the chemical corrosion, a complete elastoplastic damage constitutive model is constructed. The performance of this multiscale model is fully studied. It is then applied to describe the macroscopic behavior of porous limestone in the case with/without chemical corrosion, and validated by the comparisons with experimental results under different confining pressures.