Softening Induced Instability of a Stretched Cohesive Granular Layer
Softening Induced Instability of a Stretched Cohesive Granular Layer
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DOI：
10.1103/physrevlett.105.208001
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发表时间：
2010-11-10
影响因子：
8.6
通讯作者：
Geminard, Jean-Christophe
中科院分区：
文献类型：
--
作者：
Alarcon, Hector;Ramos, Osvanny;Geminard, Jean-Christophe
我们报告了一种细胞图案，它自发地形成于一层薄薄的粘性颗粒材料的表面，使其服从平面内拉伸。我们提出了一个简单的模型，在该模型中，导致不稳定的机制是在典型应变之上的潮湿颗粒材料所表现出的“应变软化”。我们的分析表明，在任何对应变扰动呈现负应力敏感性的系统中，都应该观察到这种类型的不稳定性。
We report on a cellular pattern which spontaneously forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching. We present a simple model in which the mechanism responsible of the instability is the "strain softening" exhibited by humid granular materials above a typical strain. Our analysis indicates that such a type of instability should be observed in any system presenting a negative stress sensitivity to strain perturbations.