Study on structural modeling and nonlinear deformation behavior analysis of porous refractory bricks including coarse-grained aggregate

Research Project

Project/Area Number	18K03835
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 18010:Mechanics of materials and materials-related
Research Institution	Shizuoka University
Principal Investigator	Sakaida Yoshihisa 静岡大学, 工学部, 教授 (10334955)
Project Period (FY)	2018-04-01 – 2021-03-31
Project Status	Completed (Fiscal Year 2020)
Budget Amount *help	¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000) Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000) Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords	多孔質耐火れんが / 粗骨材粒 / 弾性ヒステリシス / 非線形変形 / 構造粘性 / 減衰要素
Outline of Final Research Achievements	In this study, porous refractory magnesia-spinel bricks including coarse-grained aggregate were used. The load-strain curves during loading and unloading were measured by 4-point bending and uniaxial compressing. The deformation behavior of this material showed an elastic hysteresis. The elastic hysteresis was found to be independent on both loading and unloading speed. The elastic hysteresis was examined by structural modeling using spring and viscous elements based on particle dynamics. It was concluded that the deformation behavior of porous bricks including coarse-grained aggregate could be expressed by the Voigt model with elastic spring and structural viscous elements.
Academic Significance and Societal Importance of the Research Achievements	焼成炉に用いるマグネシア・スピネル質れんがは，１から５ｍｍの粗骨材粒を中粒と細粒に加えて焼き固めることで収縮率を抑え，脱落し難い耐スポーリング性の高い機能性れんがを提供し，炉の安全を担保してきた．その一方で，粗骨材粒の混合比を増すと健全性が増すとともに，非線形な変形挙動を示すようになるが，なぜ非線形な変形挙動を示すか不明であった．この研究で，れんがの実際の変形特性を定量的に把握し，ばね要素と構造粘性要素のフォークトモデルで特異な変形挙動を表現できることが判明した．今後，れんがの健全性をより向上させ得る“組織構造”の提案につなげることで，科研費で得た知見を社会に還元できる．