2003 Fiscal Year Final Research Report Summary
Tailoring Properties of Advanced Composites with Optimal Microstructure
| Project/Area Number |
14550068
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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 | Tokyo Institute of Technology |
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Principal Investigator |
WIJEYEWICKREMA Anil c. Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (10323776)
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| Co-Investigator(Kenkyū-buntansha) |
ANTHONY Waas ミシガン大学, 宇宙工学科, 教授
KISHIMOTO Kikuo Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (30111652)
WAAS Anthony University of Michigan, Department of Aerospace Engineering, Professor
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| Project Period (FY) |
2002 – 2003
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| Keywords | interphase / effective properties / dispersion / cut-off frequencies / bi-material wedges / topology optimization / microstructure / homogenization method |
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| Research Abstract |
Four areas related to design and analysis of advanced composites have been studied.
Prediction of interphase properties of a three-phase composite : The effective properties were calculated exactly using the four-phase composite sphere model, and also by applying the three-phase composite sphere model twice. Form contour plots the elastic properties of the interphase can be predicted when the properties of the inclusion, matrix and composite are known.
Dispersion effects in pre-stressed imperfectly bonded incompressible layered composites : Time-harmonic extensional wave propagation in a pre-stressed symmetric layered composite was considered. The dispersion relation is analyzed at the low and high wavenumber limits.
Singular stress fields of anisotropic bimaterial composite wedges : The stress singularity of anisotropic bimaterial wedges subjected to traction free boundary conditions are investigated. The characteristic equation for the order of singularity is obtained.
Topology optimization of composite materials
Topology optimization of composite materials with periodic microstructure with a buckling load criterion : By considering the homogenization problem, the eigenvalue problem and the optimization problem, the problem of determining highly localized buckling modes in a periodic cellular microstructure was considered. The optimal material distribution design was done according t two different formulations.
Microstructure optimization of composite materials using homogenization method : Bi-material composite design with maximum shear modulus for given volume fractions were studied using the homogenization method. Using several different initial designs, different types of composite material microstructure with maximum shear modulus have been investigated.
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