Isothermal curves intersection:
Isothermal tests have shown that, when highly strained, coiled actuators revert their tendency
to shorten/extend with increasing temperature (section IV A).
• Isometric temperature-load profiles:
Isometric measurements show a highly repeatable response of NCs load variations to temperature
change, with a clearly linear trend (section IV B).
• New data about elastic energy densities:
Stored elastic energy have been measured and show that coiled actuators could be successfully
employed as high performance passive springs.
Future works may address other unexplored areas such as: comparisons among different crystallinity
and types of precursor fibres (i.e. nylon 6.6 and polyethylene), assessments of the influence
of some manufacturing parameters (e.g, load during fabrication, heat treatment temperature, thermal
annealing in air or vacuum) on the mechanical response and on the energy density, dynamic
behaviour, etc. Future work should also investigate some possible critical aspects such as durability,
fatigue lifetime, UV resistance, or effect of hygroscopy on the performance.
Isothermal curves intersection:Isothermal tests have shown that, when highly strained, coiled actuators revert their tendencyto shorten/extend with increasing temperature (section IV A).• Isometric temperature-load profiles:Isometric measurements show a highly repeatable response of NCs load variations to temperaturechange, with a clearly linear trend (section IV B).• New data about elastic energy densities:Stored elastic energy have been measured and show that coiled actuators could be successfullyemployed as high performance passive springs.Future works may address other unexplored areas such as: comparisons among different crystallinityand types of precursor fibres (i.e. nylon 6.6 and polyethylene), assessments of the influenceof some manufacturing parameters (e.g, load during fabrication, heat treatment temperature, thermalannealing in air or vacuum) on the mechanical response and on the energy density, dynamicbehaviour, etc. Future work should also investigate some possible critical aspects such as durability,fatigue lifetime, UV resistance, or effect of hygroscopy on the performance.
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