2024-03-28T08:37:23Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00025212
2023-01-16T04:15:58Z
320:321:322
Design methodology for porous composites with tunable thermal expansion produced by multi-material topology optimization and additive manufacturing
Takezawa, Akihiro
75269
Kobashi, Makoto
75270
Polymer-matrix composites (PMCs)
Thermomechanical Computational modelling
Finite element analysis (FEA)
Additive manufacturing
To realize negative thermal expansion (NTE), porous composites made of two materials with different coefficients of thermal expansion are being actively researched. NTE can be realized by taking advantage of the thermal deformation mechanisms of a composite material's internal geometry. However, in addition to negative thermal expansion, materials with anisotropic and large positive thermal expansion are also desirable for various applications. Also, additive manufacturing provides new ways to fabricate composites by layering multiple materials at arbitrary points in three-dimensional space. In this study, we developed a design methodology for porous composites, which showed defined thermal expansion characteristics, including negative and positive thermal expansion as well as isotropic and anisotropic thermal expansion. Our approach was tested based on the fabrication of a multi-material photopolymer by additive manufacturing. The internal geometries required to produce such characteristics were designed by topology optimization, which is the most effective structural optimization method for realizing macroscopic inward deformation and for maintaining stiffness. The designed structures were converted to three-dimensional models and fabricated by multi-material photopolymer additive manufacturing. Using laser scanning dilatometry, we measured the thermal expansion of these specimens, revealing well-ordered thermal expansion, from anisotropic positive thermal expansion to anisotropic negative thermal expansion, over a wide range of about −3 × 10^−4 K^−1 to 1 × 10^−3 K^−1.
ファイル公開日:2019/12/15
journal article
Elsevier
2017-12-15
application/pdf
Composites Part B: Engineering
131
21
29
1359-8368
https://nagoya.repo.nii.ac.jp/record/25212/files/manuscript_final.pdf
eng
https://doi.org/10.1016/j.compositesb.2017.07.054
©2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/