Bend Sensors Longevity Tests

We seem to be experiencing a change in the bend sensor’s behavior over time – an increasing hysteresis in the sensors recovery from bend over time. Bending the sensor results in an immediate increase in resistance, but straightening the sensor out, it takes a moment for the resistance to decrease again.

We are setting up a test rig to monitor how they might be changing over time.

Bend sensors to test:

– Spectra symbol long and short
– Flexpoint 3” (no overlaminate, polyester overlaminate, polyiamide overlaminate)
– Handmade bend sensors with conductive thread and Velostat/Eeonyx non-woven
IMG_3274

Spectra symbol long and short

Flexpoint 3” (no overlaminate, polyester overlaminate, polyiamide overlaminate)

Materials:
The Polyester Overlamimnate is a 3M product 1 mil thick.
The Polimide Overlaminate is a Sheldahl product 1 mil thick #T161211.
The material that we print on is called Kapton.

Performance:
The sensors with Polyimide Overlaminate performed up to 30 million cycles without fail.
The sensors with Polyester Overlaminate performed up to 5 million cycles without fail.

Handmade bend sensors with conductive thread and Velostat/Eeonyx non-woven

2 Comments so far

  1. Jordan Carroll on August 11th, 2014

    It could just be me, but I didn’t understand the verdict. Which bend sensors ended up performing best? How did the hand-made sensors perform?

  2. Hannah Perner-Wilson on August 11th, 2014

    the tests have not been completed yet. but will post data as soon as we do!

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