Abstract
A modeling study of the potential for storing energy in the elastic deformation ofsprings comprised of carbon nanotubes (CNTs) is presented. Analytic models weregenerated to estimate the ideal achievable energy density in CNTs subject toaxial tension, compression, bending and torsion, taking into account limitingmechanisms such as the strength of individual CNTs, the onset of buckling, and thepacking density limitations of CNT groupings. The stored energy density in CNTsprings is predicted to be highest under tensile loading, with maximum values morethan three orders of magnitude greater than the energy density of steel springs,and approximately eight times greater than the energy density of lithium-ionbatteries. Densely packed bundles of precisely aligned, small diameter single-walledcarbon nanotubes are identified as the best structure for high performance springs.The conceptual design and modeling of a portable electric power source thatstores energy in a CNT spring are presented as tools for studying the potentialperformance of a system for generating electricity from the CNTs’ stored mechanicalenergy.
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