• Physics 15, s73
A mannequin attributes the propagating bands that seem in a compressed porous medium to structural adjustments alone.
Porous media reminiscent of snow, sand, cereals—even bones—develop strikingly comparable banded patterns after they’re squeezed. These bands type when localized deformation zones propagate all through the fabric. Understanding what triggers the common and “material-agnostic” emergence of the bands is a typical objective in disciplines together with avalanche analysis, petroleum extraction, structural engineering, geophysics, and agriculture. Now, describing the phenomenon utilizing a mannequin based mostly completely on a collapsing-pore mechanism, Lars Blatny and his colleagues on the Swiss Federal Institute of Know-how, Lausanne, and the College of Sydney, Australia, establish a typical origin for these patterns. The outcome may 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 under. The construction was perforated with often 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 energy, the researchers examined how completely different porous constructions deform when compressed at a continuing pace. They recognized six courses of compaction patterns (Fig. 1) and located that they might 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 based mostly in Vancouver, Canada.
- L. Blatny et al., “Microstructural origin of propagating compaction patterns in porous media,” Phys. Rev. Lett. 128, 228002 (2022).