Research on damping characteristics of fine particle composite rubber by dynamic X-ray CT

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04349
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Matsubara Masami 豊橋技術科学大学, 工学(系)研究科(研究院), 准教授 (40736427)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: X線CT / ゴム材料 / 制振材

Outline of Final Research Achievements

Since rubber materials are used as damping materials, clarification of the relationship between loss factor and microstructure obtained from dynamic viscoelastic tests will lead to the development of higher performance damping materials. In this study, a dynamic X-ray CT method was developed to directly evaluate the deformation behavior of materials under dynamic conditions. As a result, 4D-CT with 1 Hz excitation and 0.5 μm spatial resolution was realized. Local strain was obtained from the X-ray CT at each phase, and the deformation behavior was evaluated as the local strain amplitude. It was found that the distribution curve of the local strain amplitude changed depending on the compounding conditions, and that the peak of the distribution curve of the local strain amplitude decreased and the distribution became wider as the fine particles were compounded.

Free Research Field

機械力学

Academic Significance and Societal Importance of the Research Achievements

振動工学においては，制振材の減衰特性を実験的に評価し，解析モデルと実験式モデルを組み合わせたSemi-Physicalなモデルの構築に注力してきた．このとき，対象物を均質材料として考えており，取り扱いを簡易にしており，配合条件によるエネルギー散逸機構の違いを明確にできない．本研究では動的X線CTを用いることで「定常加振下における材料内部の微視的な変形挙動」を把握し，「エネルギー散逸の原因」および「配合条件と減衰特性の関係」を明らかにする．