Phase-field modeling of cyclic behavior in quasi-brittle materials: A micromechanics-based approach

Abstract

In this paper, we extend a micromechanics-based phase-field framework for fatigue fracture to incorporate cyclic plasticity with ratcheting. This mechanism is particularly relevant for low-cycle fatigue, where the accumulation of inelastic strains plays a critical role in the progression to final failure. An energetic formulation is proposed in which the ratcheting strain is explicitly incorporated into both the free energy and the dissipation potential. Ratcheting is modeled within a pressure-dependent, non-associative plasticity framework through the evolution of a ratcheting strain that progressively accumulates over loading cycles, capturing the characteristic inelastic strain growth of cyclic plasticity in a thermodynamically consistent manner. The plastic potential is formulated such that the deviatoric and volumetric components of ratcheting can be controlled independently. A staggered solution scheme is employed to solve for the internal variables, including the ratcheting strain. The model is validated through numerical simulations under a wide range of loading conditions, including monotonic and cyclic regimes (stress- and strain-controlled, low- and high-cycle fatigue), enabling evaluation of its performance and the influence of ratcheting on the material response, and demonstrating its applicability to realistic engineering scenarios.