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We have reported a new, multi-scale approach that improves the fatigue resistance of particle-filled rubbers, published in Nature. Our sample (right) was nearly intact after 350,000 cycles. Look at the thread from Jason, co-first author of the paper.

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Junsoo Kim

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45,195 Aufrufe • vor 2 Jahren •via X (Twitter)

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Junsoo Kimvor 2 Jahren

Besides the science of the paper, here I would like to highlight our fatigue tester. The fatigue of soft materials is an old subject but not easy to study as it is expensive! A tensile tester is ~$100k. ~500k cycles are needed for one fatigue threshold, which takes several days.

Profilbild von Junsoo Kim
Junsoo Kimvor 2 Jahren

In this paper, we built multiple fatigue testers with ~$500/ea. It is good enough for soft materials where the load is low. All parts are from either Amazon or McMaster-Carr, controlled by Arduino. This allowed us to measure the fatigue threshold as a function of two variables!

Profilbild von Junsoo Kim
Junsoo Kimvor 2 Jahren

The detailed procedure is in the Method. The entire Arduino code is in the Supplementary Information. An undergraduate student can build this. One can improve it with a load cell. *There is one typo in the code: directionPin = 8 -> 9; stepPin = 9 -> 8.

Profilbild von Junsoo Kim
Junsoo Kimvor 2 Jahren

The Harvard SEAS posted an article about our work. We initially hypothesized something logical but it turned out to be wrong. Actually, we wished we were wrong. Finding a pretty pebble on the shore is always thankful and joyful.

Profilbild von Yi Yang
Yi Yangvor 2 Jahren

@jasongsteck @zhigangsuo @ykutsovsky Just got a chance to check out this cute video 😃. It's interesting to see a new function of the kirigami gripper as a test platform for preventing crack growth. @dpholmes

Profilbild von Jiawei Yang
Jiawei Yangvor 2 Jahren

@jasongsteck @zhigangsuo @ykutsovsky Another piece of impact work

Profilbild von Chenghai Li
Chenghai Livor 2 Jahren

@jasongsteck @zhigangsuo @ykutsovsky Congrats, fantastic work!

Profilbild von International Journal of Extreme Manufacturing
International Journal of Extreme Manufacturingvor 2 Jahren

@jasongsteck @zhigangsuo @ykutsovsky Congratulations!

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