Experimental micromechanical analysis of a 2D granular material: Relation between structure evolution and loading path
Experimental micromechanical analysis of a 2D granular material: Relation between structure evolution and loading path
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DOI：
10.1002/(sici)1099-1484(199704)2:2
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发表时间：
1997-04-01
期刊：
影响因子：
--
通讯作者：
Lanier, J
中科院分区：
文献类型：
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作者：
Calvetti, F;Combe, G;Lanier, J
本文研究的是由木质辊堆组成的 Schneebeli 材料样本的微观力学。进行了多项实验室测试来分析复杂负载条件下的材料行为，包括加载-卸载循环和主轴旋转。为了表征微机械变形特征和结构演化，在加载过程中拍摄了一系列照片。然后使用立体设备将图片数字化，获得每个滚筒的位置。从这些数据出发，为此目的而设计的许多计算机程序使我们能够测量微观力学变量并分析它们的演变。在下文中，在描述了本研究中使用的设备之后，分析了宏观力学结果，以评估实验室模型的可靠性。然后，引入局部变量，并讨论使用连续介质力学来描述颗粒材料的行为。最后，描述了局部运动学变量的演变，重点关注样本各向异性的演变。 (C) 1997 年，约翰·威利父子公司 (John Wiley & Sons, Ltd)。
This paper is concerned with micromechanics of Schneebeli material specimens composed of wooden roller stacks. Several laboratory tests are carried out to analyse the material behaviour under complex loading conditions, involving loading-unloading cycles and principal axes rotations. In order to characterize micromechanical deformation features and structure evolution, a series of pictures is taken during loading. Pictures are then digitized using a stereo device, obtaining the position of each roller. Starting from these data a number of computer programs, conceived for the purpose, allow us to measure micromechanical variables and to analyse their evolution.In the following, after the description of the devices employed in this research, macromechanical results are analysed to evaluate the reliability of the laboratory model. Then, local variables are introduced and the use of continuum mechanics to describe granular materials behaviour is discussed. Finally, the evolution of local kinematic variables is described, focusing interest on the evolution of specimen anisotropy. (C) 1997 by John Wiley & Sons, Ltd.