2006 Fiscal Year Final Research Report Summary
Evaluation Method of Thermal Shock for Porous Ceramics
| Project/Area Number |
16560073
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Ehime University |
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Principal Investigator |
TSUTSUMI Mitsuyoshi Ehime University, Graduate School of Science and Engineering, Lecture, 理工学研究科, 講師 (70293925)
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| Co-Investigator(Kenkyū-buntansha) |
OKABE Naeatoshi Ehime University, Graduate School of Science and Engineering, Professor, 理工学研究科, 教授 (20281181)
TAKAHASHI Manabu Ehime University, Graduate School of Science and Engineering, Associate Professor, 理工学研究科, 助教授 (20274334)
ZHU Xia Ehime University, Graduate School of Science and Engineering, Lecture, 理工学研究科, 講師 (90325358)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Thermal shock / Thermal fatigue / FEM / Ceramics / Porous Ceramics |
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| Research Abstract |
In this study, the thermal shock test system equipped with high temperature heating gas generator of two stage burners was developed, and thermal shock tests for porous ceramics were carried out by using developed test machine. Damages of tested materials were investigated by measuring their bending fracture strengths, and the result showed that developed testing method worked effectively. FEM analysis on thermal shock revealed that generated thermal stress under thermal shock caused initiation of crack and its propagation length was controlled by degree of thermal stress.
On the other hand, fracture tests under room temperature for porous ceramics ware carried out to research base strength properties, and analysis modeling of the materials was investigated by using formula and FEM. Results of model analysis are summarized as followings; (1) Models show scale dependency that nominal fracture stress of model with small cross section area is smaller than that with large cross section area. This result agrees with experimental one. (2) By introducing pore elements, models could simulate dispersion of strength and rigidity, and these are strongly affected by distribution of pore elements. These results imply the existence of large defects by linkage of pores in actual porous ceramics.
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