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Abstract: Super-compressible foam-like carbon nanotube films have been reported toexhibit highly nonlinear viscoelastic behaviour in compression similar to softtissue. Their unique combination of light weight and exceptional electrical,thermal and mechanical properties have helped identify them as viable buildingblocks for more complex nanosystems and as stand-alone structures for a varietyof different applications. In the as-grown state, their mechanical performanceis limited by the weak adhesion between the tubes, controlled by the van derWaals forces, and the substrate allowing the forests to split easily and tohave low resistance in shear. Under axial compression loading carbon nanotubeshave demonstrated bending, buckling8 and fracture9 or a combination of theabove depending on the loading conditions and on the number of loading cycles.In this work, we partially anchor dense vertically aligned foam-like forests ofcarbon nanotubes on a thin, flexible polymer layer to provide structuralstability, and report the mechanical response of such systems as a function ofthe strain rate. We test the sample under quasi-static indentation loading andunder impact loading and report a variable nonlinear response and differentelastic recovery with varying strain rates. A Bauschinger-like effect isobserved at very low strain rates while buckling and the formation of permanentdefects in the tube structure is reported at very high strain rates. Usinghigh-resolution transmission microscopy



Author: A. Misra, J.R. Greer, C. Daraio

Source: https://arxiv.org/







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