Here is a video showing the signal from a u-turn stitched stretch sensor on a stretchy surface undergoing some cycling.
The tester is built based on a linear translation stage from Actobotics: https://www.servocity.com/channel-slider-kit-a
We 3D printed the white clamps for attaching soft materials to the Actobotics parts. The design files (.stl) are attached below.
Measuring Actuator Force and Temperature
A 1-Newton spring scale and Fluke VT02 thermal imaging camera were used to monitor the temperature and force of actuators as they were powered from a DC supply at approximately 6V and 250 mA (1.25 W).