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Volume 26, Issue 1
Displaying 1-6 of 6 articles from this issue
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[in Japanese]2000 Volume 26 Issue 1 Pages 1-2
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
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Kazumi HIRANO2000 Volume 26 Issue 1 Pages 3-8
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
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Naoki TAKANO, Masaru ZAKO, Masaya NAKAGAWA2000 Volume 26 Issue 1 Pages 9-16
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThis paper proposes a novel design methodology of graded microstructures of functional composites for the emergence of macroscopic function. Micro-macro correlation is analyzed by the homogenization theory. That is, the homogenized properties such as elastic moduli and coefficients of thermal expansion and thermal conductivity are calculated for arbitrary complex microstructures. Then, the functional composites with graded microstructures can be replaced by a homogenized model. Also because it is impossible to design all of the numerous graded microstructures, a discretized model is adopted. To determine the optimum graded arrangement of the microstructures in the discretized model, the genetic algorithm is adopted in this paper. Next, the design of continuously graded microstructures is completed using a feature-based 3D-CAD system. In addition, a solid model is produced by the stereolithography to help the understanding of the designed complex microstructures. Brief description of the formulation of the homogenization method for heat conduction and thermal stress problems are shown. An example of the design of a plate with graded microstructures in its thickness direction to control the macroscopic temperature distribution, thermal strain distribution and deflection is shown.View full abstractDownload PDF (7857K) -
Kohei GOTO2000 Volume 26 Issue 1 Pages 17-24
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThe dynamic mechanical properties of the composites of poly (p-phenylen terephthalamide) (PPTA) fibers (rigid molecules) and poly (methyl methacrylate) (PMMA) matrix (flexible molecules), were investigated as a function of the surface area of the fiber and temperature. These composites showed reinforcing effect indicated by the storage modulus (E') over the whole temperature range. At the temperature region of glassy state, E' was influenced by both the elastic modulus and the surface area of reinforcing fiber. However, at the temperature region of rubbery state, E' depended mainly on the surface area. Disappearance of β-relaxation, that is attributed to rotation mode of the side-chain, and the shift to the higher temperature side of α-relaxation of main-chain of PMMA were observed in the PPTA composite with larger surface area. These results are attributed to an interaction at the PPTA/PMMA interface. Furthermore retardation of thermal decomposition of PMMA was observed in the presence of PPTA. It can be shown that the higher activation energy for the thermal decomposition of PMMA is equivalent to higher interaction energy in the PPTA composites. The shift of -NH, >C=O IR absorption band of benzanilide, a model compound of PPTA, with change in the PMMA composition proved that the interaction is chemically originated from the formation of hydrogen bond between PPTA and PMMA.View full abstractDownload PDF (2948K) -
Tetsunori HIGUCHI2000 Volume 26 Issue 1 Pages 25-27
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (996K) -
Takahira AOKI, Takeshi TAKATOYA, Sunao SUGIMOTO, Yoshinobu SHIMAMURA, ...2000 Volume 26 Issue 1 Pages 28-34
Published: January 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (2938K)
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