Incorporation of tension-compression asymmetry into plastic damage phase-field modeling of quasi brittle geomaterials

摘要: Abstract Both experiments and theoretical investigations have evidenced the existence of compressive-shear fracture mode in geomaterials like concrete, rocks gypsum. Proper description modeling intricate fracturing pattern with consideration strong tension-compression asymmetry mechanical response remain an open issue phase-field simulation. In this work, a new phase field model plasticity-damage coupling is formulated framework irreversible thermodynamics. Two essential features, as well two distinct modes, are taken into account by incorporating scalar-valued damage variables classical framework. By defining specific free energy density function, between plasticity achieved involving variable yield function. The proposed validated at levels. homogeneous cases, behaviors typical investigated plane stress condition. Meanwhile, stress-based crack onset criterion utilized to capture failure behavior both tension compression. numerical simulations, local integration implicit return mapping algorithm decoupling treatment developed. Three examples performed demonstrate respectively I, mixed-mode II geomaterials. Comparisons simulations experimental data make it possible evaluate predictive performance bi-dissipative model. addition, analysis carried out explain changing propagation tensile-shear (hybrid) mode.