• Physics 15, s73
A mannequin attributes the propagating bands that seem in a compressed porous medium to structural modifications alone.
Porous media akin to snow, sand, cereals—even bones—develop strikingly comparable banded patterns once they’re squeezed. These bands kind when localized deformation zones propagate all through the fabric. Understanding what triggers the common and “material-agnostic” emergence of the bands is a typical aim in disciplines together with avalanche analysis, petroleum extraction, structural engineering, geophysics, and agriculture. Now, describing the phenomenon utilizing a mannequin primarily based completely on a collapsing-pore mechanism, Lars Blatny and his colleagues on the Swiss Federal Institute of Expertise, Lausanne, and the College of Sydney, Australia, establish a typical origin for these patterns. The consequence might result in complete continuum-mechanics fashions of porous media.
Blatny and his colleagues simulated a vertical 2D slice of an elastoplastic construction that was squeezed from above and beneath. The construction was perforated with recurrently spaced sq. holes that composed 25% to 75% of its whole space. By various the strong space fraction and the construction’s elasticity and yield power, the researchers examined how completely different porous constructions deform when compressed at a continuing pace. They recognized six courses of compaction patterns and located that they may describe these courses completely by two numbers that characterize the fabric’s properties and the pace at which the construction was compressed.
Though every of those courses has been recognized by earlier fashions, these fashions have relied on empirical hardening or fee legal guidelines which are materials particular. Blatny’s mannequin captures all of the courses inside a single framework.
Rachel Berkowitz is a Corresponding Editor for Physics Journal primarily based in Vancouver, Canada.
- L. Blatny et al., “Microstructural origin of propagating compaction patterns in porous media,” Phys. Rev. Lett. 128, 228002 (2022).