1991 Fiscal Year Final Research Report Summary
Study on Themal Stresses in a Fluid-Filled Poroelastic Body
| Project/Area Number |
01550063
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
材料力学
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| Research Institution | Iwate University |
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Principal Investigator |
KURASHIGE Michio Iwate Univ., Faculty of Engng., Professor, 工学部, 教授 (20005416)
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| Co-Investigator(Kenkyū-buntansha) |
IMAI Kazuwo Iwate Univ., Faculty of Engng., Assistant, 工学部, 助手 (70113850)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Porous Material / Thermal Stress / Transient Response / Porosity / Effective Modulus / Glass Bead / Sintering / Random packing |
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| Research Abstract |
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
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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
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