Figure 2
F. Kun/Univ. of Debrecen

Simulated stone. Researchers modeled the stress-induced breaking of a material similar to sandstone. Particles have been returned to their initial positions before the break, and yellow particles are in regions that, during the fracture, became detached from the main (red) body of the column (top, left). Removing the yellow particles exposes the main fracture (top, right). The team created the virtual material by allowing a collection of particles with a range of sizes to settle together and become connected by “beams” representing adhesions to their nearest neighbors (bottom).