Physical Realization of Elastic Cloaking with a Polar Material
Name
PhysRevLett.124.114301.pdf
Size
2.75 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Xu, Xianchen
Wang, Chen
Shou, Wan
Du, Zongliang
Chen, Yangyang
Li, Beichen
Matusik, Wojciech
Hussein, Nassar
Huang, Guoliang
Date Issued
March 2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Xu, Xianchen, et al. "Physical Realization of Elastic Cloaking with a Polar Material." Physical Review Letters, 124, 11 (March 2020): 114301. © 2020 American Physical Society
Version
Final published version
Abstract
An elastic cloak is a coating material that can be applied to an arbitrary inclusion to make it indistinguishable from the background medium. Cloaking against elastic disturbances, in particular, has been demonstrated using several designs and gauges. None, however, tolerate the coexistence of normal and shear stresses due to a shortage of physical realization of transformation-invariant elastic materials. Here, we overcome this limitation to design and fabricate a new class of polar materials with a distribution of body torque that exhibits asymmetric stresses. A static cloak for full two-dimensional elasticity is thus constructed based on the transformation method. The proposed cloak is made of a functionally graded multilayered lattice embedded in an isotropic continuum background. While one layer is tailored to produce a target elastic behavior, the other layers impose a set of kinematic constraints equivalent to a distribution of body torque that breaks the stress symmetry. Experimental testing under static compressive and shear loads demonstrates encouraging cloaking performance in good agreement with our theoretical prediction. The work sets a precedent in the field of transformation elasticity and should find applications in mechanical stress shielding and stealth technologies.
MIT Department
Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.124.114301
