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Study on Themal Stresses in a Fluid-Filled Poroelastic Body

充液多孔弹性体中的热应力研究

基本信息

批准号：
01550063
负责人：
KURASHIGE Michio
金额：
$ 1.41万
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：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550063/
关键词：
Porous Material Thermal Stress Transient Response Porosity Effective Modulus Glass Bead Sintering Random packing 多孔貭機多孔貭材空げき率拡散係数

项目摘要

1. Proposal of a thermoelastic theory of fluid-filled porous materials : (1)In order to extend a mechanics of poroelastic materials so as to include thermal effects, we compared the phenomenological theory by Rice-Cleary and the mixture theory by applying the continuum therondynamics, and concluded the former was better to do so. (2)By extending the Rice-Cleary theory, we proposed a thermoelastic theory of fluid-filled porous materials, which includes an effect of the heat transportation by pore fluid flow(heat advection)(3)Using the known data of mechanical properties for various porous materials, we examined some simplification of the basic equations derived, and proposed some sets of simplified equations on the basis of the analysis of a simple one-dimensional problem.2. Application of the basic equations derived : (1)Mathematically analyzing thermal stresses in a hollow circular cylinder wall, we mainly cleared some effects of the heat advection on the termal stresses. (3)By use of … More a hollow circular cylinder model, we analyzed active cooling and thermal stress reduction by resorting to the heat advection, and showed that fluid pressurization-injection from an outer surface of the cylinder is a good measure to keep the maximum temperature and the maximum tensile hoop stress low and to avoid the excessive compressive stress.3. Measurement of the three phase velocities traveling through sintered glass beads by the ultrasonic pulse method : We succeeded in detection of the second compressional wave and and showed that the phase velocities of the first compressional and shear waves fall between the estimates by two self-consistent composite models.4. Estimation of effective moduli of the poroelastic material : We established a method of their estimation for sintered circular particles by response analysis of random networks of three freedom springs, simulation of random packing of the circular particles, and FEM analysis of three spring constants of a pair of the particles. Less

1.（1）为了将多孔弹性材料力学扩展到包括热效应，我们应用连续介质热力学对Rice-Cleary的唯象理论和混合物理论进行了比较，认为前者更适合于考虑热效应。(2)By在Rice-Cleary理论的基础上，提出了考虑孔隙流体热传导效应的多孔材料热弹性理论（热平流）（3）利用已知的各种多孔材料的力学性能数据，对所导出的基本方程进行了简化，并在分析一个简单一维问题的基础上，提出了几组简化方程.推导出的基本方程的应用：（1）对空心圆柱壁的热应力进行数学分析，主要明确了热平流对热应力的影响。(3)By使用 ...更多信息对一个空心圆柱体模型进行了热平流主动冷却和热应力消减的分析，结果表明，从圆柱体外表面加压喷射流体是一种很好的措施，可以使圆柱体的最高温度和最大环向拉应力保持在较低的水平，避免产生过大的压应力.超声脉冲法测量烧结玻璃微珠中的三相速度：成功地检测到第二纵波，并表明第一纵波和横波的相速度落在两个自洽复合模型的估计值之间.多孔弹性材料有效模量的估算：通过对三自由度弹簧随机网络的响应分析、圆形颗粒的随机堆积模拟和一对颗粒的三个弹簧常数的有限元分析，建立了一种估算烧结圆形颗粒有效模量的方法。少