第136回北大MMCセミナー

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Fluid-driven crack propagation is an important issue related to the fracking well stimulation technique in these decades. There are two major issues related to fluid-driven crack propagation, namely: hydraulic fracturing and desiccation cracking. Hydraulic fracturing occurs due to the high water injection in a reservoir which causes open cracks along the fluid flow. Opposite to hydraulic fracturing, desiccation cracking is reproduced by water evaporation along the material surface which can induce volume shrinkage in the material. We propose a phase field model for crack propagation due to fluid pressure which is applicable to both hydraulic fracturing and desiccation cracking. The proposed model involves irreversibility of the crack propagation, non-penetration condition of the crack surface, fluid pressure in the porous medium, and a natural energy dissipation property. This is a joint work with Sayahdin Alfat, Kanazawa University.