Anisotropic behaviour of bulk solids and its effect on silo design
Anisotropic behaviour of bulk solids and its effect on silo design
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散装固体的各向异性行为及其对筒仓设计的影响
DOI：
10.1016/j.powtec.2012.12.049
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发表时间：
2013
影响因子：
5.2
通讯作者：
A. Kwade
中科院分区：
文献类型：
--
作者：
T. Ittershagen;H. Zetzener;J. Schwedes;A. Kwade
各向异性材料行为是散装固体的特征性质。以往的研究工作证明，当压溃应力和固结应力方向不一致时，粘性散粒体的实测无侧限屈服强度较低。一种新的粉末测试仪已被开发来测量在单轴方向上的无侧限屈服强度，这提供了在同一方向上的固结和坍塌应力，以及各向异性的无侧限屈服强度，这意味着固结和坍塌应力是在正交方向。壁和散装固体之间的摩擦通过使用橡胶膜而最小化，该橡胶膜与散装样品均匀地变形。测定了石灰石粉在不同固结应力下的单轴和各向异性无侧限屈服强度。文中还讨论了试验结果及其在漏斗流筒仓设计中的应用。为了避免管道，漏斗流筒仓的设计有两个设计标准：Jenike假设筒仓出口附近的应力处于被动状态（Jenike，1961 [1]）; Johanson假设应力处于主动状态（Johanson，1969 [2]）。虽然Jenike的方法导致了良好的结果，在筒仓中的临界出口直径的估计与积极的应力状态是不令人满意的。使用筒仓离心机测量了应力活动状态下的管道尺寸。只有在考虑了用新的粉末试验机测得的散状固体的各向异性行为的情况下，应用设计准则才能给出合理和安全的设计值。
The anisotropic material behaviour is a characteristic property of bulk solids. Prior research work proved that the measured unconfined yield strength of cohesive bulk solids is lower when the direction of the collapsing stress and the consolidation stress does not coincide. A new powder tester has been developed to measure both the unconfined yield strength in the uniaxial direction, which provides consolidation and collapse stresses in the same direction, as well as the anisotropic unconfined yield strength, which means consolidation and collapse stresses are in orthogonal directions. The friction between the walls and the bulk solid is minimised by the use of rubber membranes which deform uniformly with the bulk sample. The uniaxial and the anisotropic unconfined yield strengths have been measured for a limestone powder at different consolidation stresses. Experimental results as well as their application on the design for funnel flow silos are discussed. To avoid piping two design criteria exist for the design of a funnel flow silo: Jenike assumes a passive state of stress to prevail close to the silo outlet (Jenike, 1961 [1]); Johanson assumes an active state of stress (Johanson, 1969 [2]). While the approach of Jenike leads to good results, the estimation of the critical outlet diameter in a silo with an active state of stress is not satisfying. The pipe dimensions for an active state of stress were measured using a silo centrifuge. The application of the design criteria gives reasonable and safe design value only if the anisotropic behaviour of the bulk solid is considered which was measured by the new powder tester.
使用立方三轴测试仪测量干粘性和无粘性粉末的各向异性行为
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
F. Li;V. Puri
通讯作者：
V. Puri
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
F. Saraber;G. Enstad;G. Haaker
通讯作者：
G. Haaker
初始压力对料仓流动性的影响
DOI：
--
发表时间：
1969
期刊：
影响因子：
--
作者：
J. R. Johanson
通讯作者：
J. R. Johanson