Journal ArticleDOI
Fabrication and deformation of three-dimensional hollow ceramic nanostructures
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TLDR
The fabrication of hollow ceramic scaffolds that mimic the length scales and hierarchy of biological materials are reported, suggesting that the hierarchical design principles offered by hard biological organisms can be applied to create damage-tolerant lightweight engineering materials.Abstract:
Creating lightweight, mechanically robust materials has long
been an engineering pursuit. Many siliceous skeleton species—
such as diatoms, sea sponges and radiolarians—have remarkably
high strengths when compared with man-made materials
of the same composition, yet are able to remain lightweight
and porous1–7. It has been suggested that these properties
arise from the hierarchical arrangement of different structural
elements at their relevant length scales8,9. Here, we report the
fabrication of hollow ceramic scaffolds that mimic the length
scales and hierarchy of biological materials. The constituent
solids attain tensile strengths of 1.75 GPa without failure
even after multiple deformation cycles, as revealed by in situ
nanomechanical experiments and finite-element analysis. We
discuss the high strength and lack of failure in terms of stress
concentrators at surface imperfections and of local stresses
within the microstructural landscape. Our findings suggest that
the hierarchical design principles offered by hard biological organisms
can be applied to create damage-tolerant lightweight
engineering materials.read more
Citations
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Journal ArticleDOI
Bioinspired structural materials
TL;DR: The common design motifs of a range of natural structural materials are reviewed, and the difficulties associated with the design and fabrication of synthetic structures that mimic the structural and mechanical characteristics of their natural counterparts are discussed.
Journal ArticleDOI
Ultralight, ultrastiff mechanical metamaterials
Xiaoyu Zheng,Howon Lee,Todd H. Weisgraber,Maxim Shusteff,Joshua R. Deotte,Eric B. Duoss,Joshua D. Kuntz,Monika M. Biener,Qi Ge,Julie A. Jackson,Sergei O. Kucheyev,Nicholas X. Fang,Christopher M. Spadaccini +12 more
TL;DR: A class of microarchitected materials that maintain a nearly constant stiffness per unit mass density, even at ultralow density is reported, which derives from a network of nearly isotropic microscale unit cells with high structural connectivity and nanoscale features, whose structural members are designed to carry loads in tension or compression.
Journal ArticleDOI
3D printing of ceramics: A review
Zhangwei Chen,Ziyong Li,Junjie Li,Chengbo Liu,Changshi Lao,Yuelong Fu,Changyong Liu,Li Yang,Pei Wang,He Yi +9 more
TL;DR: A review on the latest advances in the 3D printing of ceramics and present the historical origins and evolution of each related technique is presented in this paper. And the main technical aspects, including feedstock properties, process control, post-treatments and energy source-material interactions, are also discussed.
Journal ArticleDOI
Strong, lightweight, and recoverable three-dimensional ceramic nanolattices
TL;DR: This work demonstrates the creation of structural metamaterials composed of nanoscale ceramics that are simultaneously ultralight, strong, and energy-absorbing and can recover their original shape after compressions in excess of 50% strain.
Journal ArticleDOI
Mechanical metamaterials associated with stiffness, rigidity and compressibility: a brief review
TL;DR: In this article, a clear classification of mechanical metamaterials have been established based on the fundamental material mechanics, which can be divided into strong-lightweight (E/ρ), pattern transformation with tunable stiffness, negative compressibility (−4G/3), and strong light-weight (S/ρ).
References
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Journal ArticleDOI
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Lateral instability of elliptical hollow section beams
K.H. Law,Leroy Gardner +1 more
TL;DR: In this paper, the lateral instability of elliptical hollow section (EHS) members in bending is studied, and the influence of cross-sectional aspect ratio and member slenderness on lateral stability is assessed.
Journal ArticleDOI
Physical-mechanical properties of nanostructured titanium nitride
TL;DR: In this article, the properties of high-melting compounds have many promised properties in conventional polycrystalline state but their behaviour in nanocrystalline one is almost unknown.
Journal ArticleDOI
Torsion of the central pair microtubules in eukaryotic flagella due to bending-driven lateral buckling.
C. Li,C.Q. Ru,A. Mioduchowski +2 more
TL;DR: Results indicate that torsion of the central pair microtubules in flagella is inevitable as a result of bending-driven lateral buckling, more sensitive to the parameters defining the surrounding elastic medium than the shear modulus of microtubule.