Strong force networks in granular mixtures
Strong force networks in granular mixtures
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DOI：
10.1007/s10035-013-0455-3
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发表时间：
2014-02-01
期刊：
影响因子：
2.4
通讯作者：
Thornton, C.
中科院分区：
文献类型：
--
作者：
Minh, N. H.;Cheng, Y. P.;Thornton, C.
利用三维离散元法模拟的结果，研究了一维压缩条件下砂粉粒二元混合球的力传递。根据接触的两个球体的大小，可以将接触分为三种类型。每种接触类型对偏应力的贡献取决于粉粒球的比例。我们证明，偏差应力的大小仅仅是由于接触时的法向力和切向力传递的法向力大于特征法向力，通常略大于平均法向力。当粉砂粒的掺量为30%时，充填效率最高，该混合物对应于一个过渡点，当粉砂粒足够多时，砂粒开始相互分离，并在粉砂粒之间建立接触，从而导致偏应力。
Using the results of 3D discrete element method simulations we study the force transmission through binary mixtures of sand and silt sized spheres under one-dimensional compression. Three types of contact are categorized depending on the size of the two spheres in contact. The contributions of each contact type to the deviator stress are dependent on the proportion of silt sized spheres. We demonstrate that the magnitude of the deviator stress is solely due to the normal and tangential forces at contacts transmitting normal forces greater than a characteristic normal force, which is generally slightly greater than the average normal force. The maximum packing efficiency was obtained with the mixture of 30 % silt sized spheres and this mixture corresponds to a transition point when there are enough silt sized particles to start to separate the sand sized particles from each other and establish contacts between silt sized spheres that contribute to the deviator stress.