Towards a mechanistic model for the interaction between plastically deforming particles under confined conditions: A numerical and analytical analysis
Towards a mechanistic model for the interaction between plastically deforming particles under confined conditions: A numerical and analytical analysis
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DOI：
10.1016/j.matlet.2012.10.118
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发表时间：
2013-02-01
影响因子：
3
通讯作者：
Frenning, Goran
中科院分区：
文献类型：
--
作者：
Frenning, Goran
用有限元方法研究了塑性变形颗粒的三轴压缩，以确定在受限条件下颗粒响应的机制。除了在小应变和中等应变下建立的弹塑性行为外，以接触为中心的塑性区的合并导致刚度降低，而一旦塑性变形引起的材料填充周围的空隙空间，则可以看到刚度显著增加，这标志着由弹性体积减小主导的阶段的开始。此外，多个同时接触的分析模型制定，假设变形的颗粒形状可以近似由截断的球体和每个单独的接触的行为可以描述的硬度。由此获得的模型表现出一个有前途的协议与数值结果。(C)2012 Elsevier B.V.保留所有权利。
Triaxial compression of plastically deforming particles was studied with the finite element method in order to identify the mechanisms that underlie the particle response under confined conditions. In addition to the established elastoplastic behaviour at small and intermediate strains, the coalescence of plastic zones centred at contacts resulted in a reduced stiffness, whereas a significantly increased stiffness was seen once the material displaced by plastic deformation filled the ambient void space, signifying the onset of a stage dominated by elastic volume reduction. Moreover, an analytical model for multiple simultaneous contacts was formulated, assuming that the deformed particle shape could be approximated by a truncated sphere and that the behaviour of each individual contact could be described in terms of a hardness. The thus obtained model exhibited a promising agreement with the numerical results. (C) 2012 Elsevier B.V. All rights reserved.