期刊
SOFT MATTER
卷 14, 期 30, 页码 6171-6180出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm00874d
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资金
- Israel Science Foundation [1550/15, 1973/15]
- United States-Israel Binational Science Foundation [2016284]
- Lady Davis Fellowship
- Technion postdoctoral fellowship
We investigate the instability-induced pattern transformations in 3D-printed soft composites consisting of stiff inclusions and voids periodically distributed in a soft matrix. These soft auxetic composites are prone to elastic instabilities giving rise to negative Poisson's ratio (NPR) behavior. Upon reaching the instability point, the composite microstructure rearranges into a new morphology attaining an NPR regime. Remarkably, identical composites canmorph into distinct patterns depending on the loading direction. These fully determined instability-induced distinct patterns are characterized by significantly different NPR behaviors, thus, giving rise to enhanced tunability of the composite properties. Finally, we illustrate a potential application of these reversible pattern transformations as tunable acoustic-elastic metamaterials capable of selectively filtering low frequency ranges controlled by deformation.
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