Speaker
Description
Identifying and quantifying material memory in systems undergoing plastic deformation remains a central challenge in materials science. This paper details an experimental investigation into the signatures of such memory within porous-media research. Using a protocol of systematic pressure cycling with increasing peak stress, we analyze the evolution of local strain fields to probe the system’s transition from elastic to plastic behavior. Our primary finding reveals a seeming paradox: as the material develops a more organized memory through increased spatial correlation of plastic events, its macroscopic strain-field response to a symmetric stress cycle becomes increasingly decorrelated. We demonstrate that this decorrelation between the loading and unloading paths is a direct consequence of the spatially organized, irreversible strain that constitutes the material’s memory. We conclude by showing that this stress decorrelation signature can be observed through macroscopic, field-accessible measurements such as permeability, providing a powerful diagnostic for identifying irreversible changes in stressed granular systems.
| Country | Israel |
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