MICROMECHANICAL BACKGROUND TO A STRAIN SPACE MULTIPLE MECHANISM MODEL FOR SAND
MICROMECHANICAL BACKGROUND TO A STRAIN SPACE MULTIPLE MECHANISM MODEL FOR SAND
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砂土应变空间多机制模型的微观力学背景
DOI：
10.3208/sandf1972.33.102
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发表时间：
1993
影响因子：
3.7
通讯作者：
S. Iai
中科院分区：
文献类型：
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作者：
S. Iai
通过球体组装力学理论研究砂的行为，为应变空间中定义的广义塑性-多机制类型的本构模型提供了微观力学背景（Iai等人，1992年a）。本研究证实了存在的层次结构的压力，其中的概念发挥了基础性的作用，在推导上述模型。局部应力贡献的基本水平与特定方向的接触力有关。这种局部应力贡献水平代表应力的基本“要素”。第二水平的局部应力贡献是与虚拟平面应变机制相关联的，并且通过组合基本水平的局部应力贡献而获得。三维空间中的应力是最高水平的，它是由第二水平的局部应力贡献组合而成的，它只不过是通常定义的应力。这种类型的结构被认为是起着至关重要的作用的循环行为的沙子涉及的影响，旋转的主应力轴方向。
By theoretically studying the behavior of sand through the mechanics of assembly of spheres, a micromechanical background is offered for a constitutive model of a generalized plasticity-multiple mechanism type defined in strain space (Iai et al., 1992a). The study confirms the existence of the hierarchical structure in the stress, concept of which played a fundamental role in deriving the aforementioned model. The basic level of partial stress contribution is associated with the contact forces of a specific direction. This level of partial stress contribution represents a fundamental "element" of stress. The second level of partial stress contribution is the one associated with the virtual plane strain mechanism and obtained by combining the basic level of partial stress contributions. The stress in the three dimensional space, which is nothing but a stress of usual definition, is the highest level and obtained by combining the second level of partial stress contributions. This type of structure is believed to play a crucial role on the cyclic behavior of sand involving the effects of rotation of principal stress axis directions.