A Chemo‐Mechanically Fully Coupled Multiphase‐Field Model for Multicomponent Systems Accounting for Balance Equations on Singular Surfaces

Chemo‐mechanically coupled phenomena such as stress‐driven diffusion and diffusion‐induced stresses are of high interest, for example, in battery materials and metals. In this work, a chemo‐mechanically fully coupled multiphase‐field model for a multicomponent system is derived and validated with a sharp interface solution. Ensuring mechanical compatibility, the model accounts for balance equations on singular surfaces and the Hadamard jump conditions. The models' capability to address stress‐driven diffusion and diffusion‐induced stresses is demonstrated through the presentation of an illustrative diffusion example.