Jeon, Dongchan

Kim, Kisun

Na, Ye-eun

Shin, Dahye

English

Purdue E-Pubs

Purdue UniversityPurdue e-PubsIUTAM Symposium Architectured MaterialsMechanics Symposium ContributionsSep 17th, 12:00 AM - Sep 19th, 12:00 AMEmergence of New Density-Strength Scaling Lawin 3D Hollow Ceramic Nano-ArchitecturesYe-eun NaDahye ShinKisun KimDongchan JeonKAIST, dongchan.jang@kaist.ac.krFollow this and additional works at: https://docs.lib.purdue.edu/iutamPart of the Engineering CommonsThis document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact epubs@purdue.edu foradditional information.Recommended CitationNa, Y., Shin, D., Kim, K., & Jeon, D. (2018). Emergence of New Density-Strength Scaling Law in 3D Hollow Ceramic Nano-Architectures. In T. Siegmund & F. Barthelat (Eds.) Proceedings of the IUTAM Symposium Architectured Materials Mechanics, September17-19, 2018 , Chicago, IL: Purdue University Libraries Scholarly Publishing Services, 2018. https://docs.lib.purdue.edu/iutam/presentations/abstracts/54IUTAM Symposium Architectured Material Mechanics,  T. Siegmund, F. Barthelat, eds September 17-19, 2018, Chicago, IL, USA, , Chicago, IL, USA Emergence of New Density-Strength Scaling Law in 3D Hollow Ceramic Nano-Architectures Ye-eun Na1, Dahye Shin1, Kisun Kim2, Seokwoo Jeon2 and Dongchan Jang1 (1) Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea; dongchan.jang@kaist.ac.kr (2) Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea  KEYWORDS:  Ceramic, nano-architectured materials, 3D nano-patterning  Density-strength tradeoff appears to be an inherent limitation for most materials [1] and therefore design of cell topology that mitigates strength decrease with density reduction has been a long-lasting engineering pursue for porous materials. Continuum-mechanics-based analyses on mechanical responses of the conventional porous materials with bending-dominated structures often give the density-strength scaling law following the power-law relationship with exponent of 1.5 or higher [2], which consequentially determines the upper bound of the specific strength for a material to reach. In this work, we present a new design criterion capable of significantly abating strength degradation in lightweight materials, by successfully combining size-induced strengthening effect in nanomaterials with architectural design of cellular porous materials. Hollow-tube-based 3D ceramic nano-architectures satisfying such criterion were fabricated in large area using Proximity field nano-Patterning (PnP) [3] and atomic layer deposition (ALD). Experimental data from micro-pillar compression confirmed that the strengths of these nano-architectural materials scale with relative densities with power-law exponent of 0.93, hardly observable value in the conventional bending-dominated porous materials. Our discovery of new density-strength scaling law in the nano-architectured materials will contribute to creating new lightweight structural materials attaining unprecedented specific strengths overcoming the conventional limit. References [1] Ashby, M. F. Materials Selection in Mechanical Design 3rd edn (Butterworth Heinemann, Oxford, 2005) [2] Fleck, N. A., Deshpande, V. S. & Ashby, M. F. Micro-architectured materials: past, present and future. Proc. R. Soc. A Math. Phys. Eng. Sci. 466, 2495–2516 (2010). [3] Jeon, S. et al. Fabricating complex three-dimensional nanostructures with high-resolution conformable phase masks. Proc. Natl. Acad. Sci. U. S. A. 101, 12428–33 (2004).  

Emergence of New Density-Strength Scaling Law in 3D Hollow Ceramic Nano-Architectures

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1053&amp;context=iutam

Emergence of New Density-Strength Scaling Law in 3D Hollow Ceramic Nano-Architectures

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