Mehran Shahidi, Bernhard Pichler, Christian Hellmich
stress relaxation, eigenstresses, eigentractions, linear creep,liquid crystals, glassy water.
In this study, we consider fluids as a source of creep behav- ior of hydrated (bio-)materials, comprising heterogeneous microstructures and fluid-filled porosity at small length scales. In this context, nanoconfined fluid-filled interfaces are typically considered to act as a lubricant, once electri- cally charged solid surfaces start to glide along fluid sheets, while the fluid is typically in a liquid crystal state, which refers to an “adsorbed”, “ice-like”, or “glassy” structure of fluid molecules. Bridging liquid crystal physics with con- tinuum mechanics of materials, we employ the homoge- nization theory of eigenstressed micro-heterogeneous me- dia in order to upscale interface creep to the continuum material level. As a result, linear “interface traction-to- dislocation rate” relations are shown to entail exponentially decaying material creep and relaxation behavior.
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