Design methodology for porous composites with tunable thermal expansion produced by multi-material topology optimization and additive manufacturing

By Akihiro Takezawa, M. Kobashi. 2017

155 citations recorded by the source corpus.

Abstract 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.

Subfields: Materials Chemistry, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/7df45af3bcfd88a24839dd69a165ec2e0d14f384

How researchers see this paper

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In Materials Chemistry

1. Akihiro Takezawa
2. Zhan Kang
3. Albert C. To
4. D. Gu
5. Jinyuan Tang

In Mechanics of Materials

1. Zhan Kang
2. Jikai Liu
3. Lei Li
4. Krishnan Suresh
5. Lin Cheng
6. Akihiro Takezawa
7. Shikui Chen
8. Albert C. To

Citations in the corpus

• Current and future trends in topology optimization for additive manufacturing (2018, methodology): “Utilizing multi-material photopolymer AM, Takezawa et al. realized negative thermal expansion (Takezawa et al. 2015) and large positive thermal expansion (Takezawa and Kobashi 2017).”
• Laser additive manufacturing of nano-TiC reinforced Ni-based nanocomposites with tailored microstructure and performance (2019, background): “Typically, SLM has a unique capability of fabricating three-dimensional parts with near full density without post-processing [10,11].”