LMGC, CNRS-Université Montpellier 2, Montpellier, Cedex 5, France.
Philos Trans A Math Phys Eng Sci. 2009 Dec 28;367(1909):5123-38. doi: 10.1098/rsta.2009.0185.
We analyse the Coulomb cohesion of wet granular materials and its relationship with the distribution of capillary bonds between particles. We show that, within a harmonic representation of the bond and force states, the shear strength can be expressed as a state equation in terms of internal anisotropy parameters. This formulation involves a dependence of the shear strength on loading direction and leads to the fragile behaviour of granular materials. The contact dynamics simulations of a wet material, in which a capillary force law is prescribed, are in excellent agreement with the predictions of this model. We find that the fragile character decreases as the local adhesion is increased or the mean stress is decreased.
我们分析了湿颗粒材料的库仑内聚以及它与颗粒间毛细结合的分布之间的关系。我们表明，在键和力状态的谐波表示中，剪切强度可以表示为内部各向异性参数的状态方程。这种表述涉及剪切强度对加载方向的依赖性，导致颗粒材料易碎。对规定了毛细力定律的湿材料的接触动力学模拟与该模型的预测非常吻合。我们发现，随着局部附着力的增加或平均应力的降低，易碎特性降低。
