颗粒筏中的褶皱、褶皱和塑性
Wrinkles, folds and plasticity in granular rafts
摘要：
本文研究了在液-流界面上大而致密的颗粒压缩单层的力学响应：颗粒筏。在压缩时，筏首先起皱，然后，随着限制的增加，变形局限于一个独特的褶皱。这种特征屈曲模式通常与浮动弹性板相关，因此，颗粒负载界面通常被建模为这样。在这里，我们把这种类比的极限比较筏形态的理论连续弹性模型的接口的第一个定量测量。我们表明，虽然强大的描述皱纹波长，褶皱到褶皱的过渡和褶皱的形状，这种弹性的描述并没有捕捉到实验的细节。我们描述了一个不可预测的二次波长，压缩模型和滞后行为在压缩周期，所有这些都是一个签名的内在离散和摩擦性质的颗粒筏的压缩差异。这也表明，这些复合材料表现出塑性转变和堵塞动力学。
英文摘要：
We investigate the mechanical response of a compressed monolayer of large and dense particles at a liquid-fluid interface: a granular raft. Upon compression, rafts first wrinkle; then, as the confinement increases, the deformation localizes in a unique fold. This characteristic buckling pattern is usually associated to floating elastic sheets and as a result, particle laden interfaces are often modeled as such. Here, we push this analogy to its limits by comparing the first quantitative measurements of the raft morphology to a theoretical continuous elastic model of the interface. We show that although powerful to describe the wrinkle wavelength, the wrinkle-to-fold transition and the fold shape, this elastic description does not capture the finer details of the experiment. We describe an unpredicted secondary wavelength, a compression discrepancy with the model and a hysteretic behavior during compression cycles, all of which are a signature of the intrinsic discrete and frictional nature of granular rafts. It suggests also that these composite materials exhibit both plastic transition and jamming dynamics.
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