Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2019 Oct 11;123(15):158004. doi: 10.1103/PhysRevLett.123.158004.
Hydrated granular packings often crack into discrete clusters of grains when dried. Despite its ubiquity, an accurate prediction of cracking remains elusive. Here, we elucidate the previously overlooked role of individual grain shrinkage-a feature common to many materials-in determining crack patterning using both experiments and simulations. By extending classical Griffith crack theory, we obtain a scaling law that quantifies how cluster size depends on the interplay between grain shrinkage, stiffness, and size-applicable to a diverse array of shrinkable granular packings.
水合颗粒填充体在干燥时常常会裂成离散的颗粒簇。尽管这种现象非常普遍，但准确预测裂缝的形成仍然难以实现。在这里，我们利用实验和模拟揭示了以前被忽视的单个颗粒收缩在决定裂缝模式中的作用，这种收缩是许多材料的共同特征。通过扩展经典的格里菲斯裂纹理论，我们得到了一个定量描述簇大小如何取决于颗粒收缩、刚度和尺寸相互作用的标度律，该规律适用于各种可收缩的颗粒填充体。
