A Modified Phase-Field Fracture Model for Simulation of Mixed Mode Brittle Fractures and Compressive Cracks in Porous Rock

Abstract

In this work, we propose a modified phase-field model for simulating the evolution of mixed mode fractures and compressive driven fractures in porous artificial rocks. For the purpose of validation, the behaviour of artificial rock samples, with either a single or double saw cuts, under uniaxial plane strain compression has been numerically simulated. The simulated results are compared to experimental data, both qualitatively and quantitatively. It is shown that the proposed model is able to capture the commonly observed propagation pattern of wing cracks emergence followed by secondary cracks driven by compressive stresses. Additionally, the typical types of complex crack patterns observed in experimental tests are successfully reproduced, as well as the critical loads.

Nonlinear Matrix Ferroelectric Composites on Construction Quality and Safety Measures

“…All ferroelectric materials have both ferroelectricity and piezoelectricity. Ferroelectricity comes from spontaneous polarization, but only materials with spontaneous polarization are pyroelectrics, and reversible spontaneous polarization is the symbolic feature of ferroelectrics [10]. When spontaneous polarization overturns under the action of the external field, it will be accompanied by the changes in dielectric constant, strain and other properties, so as to realize the regulation of the external field on properties.…”

Special Issue on Rock Fracturing and Fault Activation: Experiments and Models

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An extended hydrostatic–deviatoric strain energy density decomposition for phase-field fracture theories

“…Other similar modifications for mixed-mode fracture have been suggested, cf. Spetz et al (2020Spetz et al ( , 2021. However, these modifications are not completely satisfactory, mainly because they are based on various spectral decomposition formulations preventing material stiffness degradation even when cracks are fully developed under pure shear load.…”