This study builds upon prior research in fracture modeling within Proton Exchange Membrane Water Electrolysis (PEMWE) cells. It introduces fluid flow dynamics within porous layers and examines the alterations in flow due to the initiation of fractures in the Catalyst Coated Membrane (CCM) as well as the effect of pore pressure on crack propagation. The flow modeling employs porous media mechanics, considering the impact of fractures on the permeability and porosity of the porous layers. This results in a distinct anisotropic permeability, leading to a deterioration in the functionality of the PEMWE. This expanded approach provides a more holistic understanding of the interconnected electro-chemo-mechanical degradation processes that lead to CCM fracture. Specifically, we aim to integrate Darcy’s fluid flow model with the phase-field model for fracture, through the implementation of a phase-field-dependent permeability and porosity formulations. Additionally, we will utilize a poroelastic formulation to account for the interaction between fluid and solid, as well as the stress redistribution resulting from crack propagation. The model performance will be demonstrated through representative boundary value problems that show the coupled processes of the PEMWE cell. REFERENCES: [1] Aldakheel, F., Kandekar, C., Bensmann, B., Dal, H., Hanke-Rauschenbach, R. (2022): Electro-chemo-mechanical induced fracture modeling in proton exchange membrane water electrolysis for sustainable hydrogen production. Comput Methods Appl Mech Eng, 400. [2] Aldakheel, F., Hanke-Rauschenbach, R. (2023): Energy transition with green hydrogen: Toward computational design of comprehensive proton exchange membrane water electrolysis stacks. PAMM, https://doi.org/10.1002/pamm.202300287 [3] Heider, Y. (2021). A review on phase-field modeling of hydraulic fracturing, Eng. Fract. Mech. 253 , 107881.