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The discovery of an innovative class of thermally activated actuators based on twisted polymeric  fibres  has  opened  new  horizons  toward  the  development  of  effective devices that can be easily manufactured using inexpensive materials such as fishing lines or sewing threads. These new devices show large deformations when heated together with promising performance in terms of energy and power densities. With the aim of providing information and data useful for the future engineering applications, we present the results of a thermo-mechanical characterization conducted on  a  specific  type  of  twisted  polymeric  fibre  (i.e.  nylon-made  coiled  actuators) that  is  considered  particularly  promising.  A  custom  experimental  test-bench  and procedure  have  been  developed  and  employed  to  run  isothermal  and  isometric tensile tests on a set of specimens that are fabricated with a simple and repeatable process. The results of the experiments highlight some important issues related to the response of these actuators such as hysteresis, repeatability, predictability and stored elastic energy

Experimental characterization of thermally-activated artificial muscles based on coiled nylon fishing lines