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Ultra-low-density digitally architected carbon with a strutted tube-in-tube structure.
- Source :
-
Nature materials [Nat Mater] 2021 Nov; Vol. 20 (11), pp. 1498-1505. Date of Electronic Publication: 2021 Oct 25. - Publication Year :
- 2021
-
Abstract
- Porous materials with engineered stretching-dominated lattice designs, which offer attractive mechanical properties with ultra-light weight and large surface area for wide-ranging applications, have recently achieved near-ideal linear scaling between stiffness and density. Here, rather than optimizing the microlattice topology, we explore a different approach to strengthen low-density structural materials by designing tube-in-tube beam structures. We develop a process to transform fully dense, three-dimensional printed polymeric beams into graphitic carbon hollow tube-in-tube sandwich morphologies, where, similar to grass stems, the inner and outer tubes are connected through a network of struts. Compression tests and computational modelling show that this change in beam morphology dramatically slows down the decrease in stiffness with decreasing density. In situ pillar compression experiments further demonstrate large deformation recovery after 30-50% compression and high specific damping merit index. Our strutted tube-in-tube design opens up the space and realizes highly desirable high modulus-low density and high modulus-high damping material structures.<br /> (© 2021. This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.)
- Subjects :
- Computer Simulation
Porosity
Prostheses and Implants
Carbon
Graphite
Subjects
Details
- Language :
- English
- ISSN :
- 1476-4660
- Volume :
- 20
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Nature materials
- Publication Type :
- Academic Journal
- Accession number :
- 34697430
- Full Text :
- https://doi.org/10.1038/s41563-021-01125-w