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Study of Microstructures and Macro-Mechanical Properties of Fluid-Saturated Porous Materials

流体饱和多孔材料的微观结构和宏观力学性能研究

基本信息

批准号：
04650076
负责人：
KURASHIGE Michio
金额：
$ 1.28万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650076/
关键词：
Porous Material Self-Consistent Model Effective Elastic Modulus Tortuosity Simulation Random Packing Ransom Network Spring Constant

项目摘要

To understand the relations between microstructures and macro-mechanical properties of fluid-saturated porous materials, we have performed the study and obtained the results, placing an emphasis on (1) effective elastic moduli and (2) torutuosity, as follows :(1) Effective Elastic Moduli : 1. We have compared and evaluated the static self-consistent model of composite materials and the dynamic self-consistent model based on stress wave scattering ; it has been found that, as the porosity increases, difference in the values of effective elastic moduli evaluated by these two models is larger, while, as the porosity approaches 41%, the elastic moduli given by the former model go down to zero, as agrees to those obtained by the experiment. 2. We have checked the validity of the simulation method proposed in the present study by using the 2-dimensional model and found that the method proposed is very effective. 3.On the basis of this confirmation, we have started the 3-dimensional simulation resorting to the random packing of small spheres. We have constructed the random packings of equi-radial spheres in the computer and started to evaluate the spring constants of a pair of spheres by the finite element method.(2) Tortuosity : 1. We have exzmined some existing formulae of tortuosity from the view point of hydrodynamics. Thus, we have found some bad points in them, but have not succeed in proposing a new microscopic parameter. 2. Experimentally, we have accumulated the data on the tortuosity derived from the observed phase velocity of the second compressional wave.

为了了解流体饱和多孔材料的微观结构和宏观力学性能之间的关系，我们进行了研究，并获得了结果，重点放在（1）有效弹性模量和（2）弯曲度，如下：（1）有效弹性模量：1。对复合材料的静态自洽模型和基于应力波散射的动态自洽模型进行了比较和评价;研究发现，随着孔隙率的增加，两种模型计算的有效弹性模量值差异越来越大，而当孔隙率接近41%时，前一种模型计算的弹性模量下降到零，与实验结果一致。2.我们已经使用二维模型检查了本研究中提出的模拟方法的有效性，发现所提出的方法是非常有效的。3.在此基础上，采用小球随机堆积的方法，进行了三维模拟。我们在计算机上构造了等径球的随机堆积，并开始用有限元法计算一对球的弹簧常数。(2)弯曲度：1。本文从流体力学的观点出发，对现有的几个弯曲度公式进行了论证。因此，我们发现了其中的一些缺点，但没有成功地提出一个新的微观参数。2.在实验上，我们积累了由观测到的第二纵波相速度导出的弯曲度数据。