“Bending is Bountiful: Compliant Examples are Everywhere” - Compliant Mechanism Design (Part 2C)

Examples of flexible devices that use elastic deformations to perform interesting tasks are all around us. In this three-part episode of Compliant Mechanism Design, Professor Jonathan Hopkins provides a host of such examples and discusses their impact on our daily lives.
Specifically, in this third and final part of episode 2 (i.e., Part 2C), examples of compliant joining approaches such as bolted joints, latches, press fits, snap fits, Velcro, suction cups, and other nature inspired approaches (e.g., how geckos stick to surfaces) are discussed.
Additional course resources are posted to Professor Hopkins’ website: www.flexible.seas.ucla.edu
Acknowledgements:
Special thanks to Kellar Autumn’s ground breaking work at Lewis & Clark College that unlocked the mystery of how gecko’s adhere to surfaces. The SEM images used in my video were adapted from his images with his permission. A link to his work can be found here:
www.annualrevi...
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Disclaimer:
Responsibility for the content of this video is my own. The University of California, Los Angeles is not involved with this channel nor does it endorse its content.

[@evank8459]

Very cool. People are not ready for this.

[@jasonhopkins8624]

Waiting for you to make geckoman gloves so that we can all scale walls.

[@rushikeshurunkar2]

headphone jacks when they plugged in, USB cables and their supports near end of the cable where they get bend but hard to break, tension belts or power transmission belts, light bulb holders, musical keyboard keys, typical latches, etc... actually I wanted to get one topic for my final year Masters program in Machine Design. Can you help me ? Thanks for the video.!!

[@omnianti0]

lol the end scene deny all the serious of the whole demonstration by showing non compilant and unrealistic scific movies of poor quality

[@discode1753]

does the diaphragm of a speaker count as one of the examples?

[@BrandonJHopkins]

I love the nature examples.

[@CraigHartzell]

You've opened my eyes... Compliant Mechanisms are everywhere. Great video.

[@JGD444]

Another example is the Automotive Torsion Bar (or torsion spring) en.wikipedia.org/wiki/Torsion_bar_suspension

[@vishank7]

Thanks for sharing! That is super interesting.

[@JGD444]

@@vishank7 You' re welcome

[@woodywiest]

Fantastic content. I look forward to the rest of this course.

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@danblair1296]

Contacts. Pen Caps. Battery slot springs. Locking Blades. Keyboards. Mouse buttons. Squeeze bottles.

[@secretbassrigs]

is this really supposed to be college level for UCLA? it explains so much about todays generation

[@ch-vs3fw]

Awesome Series! For homework: Keyboard buttons, audio speaksers, and wall outlets.

[@sabergoodarzi940]

Kitchen cabinet hinge Video: drive.google.com/file/d/1oN3ezUQrTrxXGw5VZCq26JejdevV_zGw/view?usp=drivesdk

[@barbudania]

Who else had his mind blown by the gecko adhesion mechanism?

[@scarscar2205]

Piano keys and hammers, foam rollers for physical therapy, thermostats...

[@chadjones1266]

Weird that the Phillips screw tightens wrong with a standard driver in that video.

[@opensourceeducated2862]

Thank you so much for these. I'm an engineer apprentice and I benefit greatly from resources like this.

[@jadelock302]

2:37 ah yes, lay goes, my favourite construction toy

[@edisonosoriomedicaltecnolo7692]

the placement of a prosthesis in the human body

[@npip99]

1:30 The forces required to shear the two planks apart, easily overcomes the miniscule force that the head of the screw is applying to the face of the plank. The planks don't shear, because shearing would push the interior wall of the plank's hole, into the exterior wall of the screw. At that point, only cracking the screw in half could allow the shear to succeed. Cracking a screw in half is incredibly difficult though, hence the screw's wall successfully resists the plank's further motion. That miniscule force created from the head of the screw, and the bolt underneath, does play a role in preventing the bolt from unthreading, however. It's only for unthreading though, it has nothing to do with actually holding the two planks together.

[@allemangd]

It's about the friction between the two plates. As the bolt compresses the plates together, the friction between those plates drastically increases and holds them in place.

[@ToyotaKTM]

Resistance to compliance is futile.

[@edisonosoriomedicaltecnolo7692]

surface latency that sustains insects in the water

[@andreasjost4739]

great video and super explananation!

[@davidalarco9917]

Thank you very much for your course. I can’t wait for chapter 3. When is it coming? Here you have one every morning additional application: Eyelashes brush-mascara, but the one I am focusing my study is on compliant lattice structures. I hope to see some of those in your next chapters...

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@KiR_3d]

Hello! Wow, I've didn't knew about hecko's fingers and how it works! It's amazing. I'm curious: is it possible to produce in some sort of rubber or similar material?

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@richricherrichestthefirst]

Great! Thank you!

[@craigtodd8297]

clip on watch backs.

[@SaHuLHKhan]

Windshield cover

[@bethle3256]

these are sooo gooooddd

[@samirachizari2485]

This was an awesome video! Both detailed and easy to understand! I look forward to the next videos!

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@hughobyrne2588]

Nails could only work if wood (or whatever you hammer a nail into) is not perfectly rigid. The plastic 6-pack holder (the six rings that hold onto the tops of beer cans) is a bit like the 'pop' fastener. It needs to be stiff enough that a little jostling, and the weight of the can pulling down, will not let it go, but compliant enough that when someone purposefully wants to pull a can off, they can without too much effort.

[@thallmeister]

Hmm... Electronic relays, centrifugal switches, earthquake resistant structures? Maybe I'm wrong but they seem fitting.

[@artmckay6704]

It's looking increasingly obvious that nano structures in the 100 nanometer (and smaller) range exhibit non- classical behavior and, as manufacturers become more adept at making structures this small, we can reasonably expect to see those gecko gloves, knee pads, and far more. Advances in nano manufacturing are going to quickly be translated into very useful technologies in the macro world that we all live in. The future is going to be simply amazing! I can't wait.....

[@STEMqueer]

Great course, can't wait for the new chapter. Thanks a lot!

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@lulululu4912]

Excellent video. As others compliant mechanisms one can cite: -compliant valves -card cover of wallet -joint for car doors, openable windows -diving fin, scuba -bottlecap hinge -plastic ketchup bottle that we press -plastic honey containers that we press and that have sorts of silicone fins (like in the case of the beverage lid but more elastic) -Plastic sleeve (used for cables protection, for faucet) -Pins for connectors, like jack connector -ratchet mechanism

[@cienciaeneldesierto1095]

Dental aligners (the plastic ones) Corrective insoles Muscles ( are triggered by electrochemical molecules, but myocytes form fibers that are a compliant mechanism) Shoe soles (impact absorption) Joysticks

[@LeonardNorrgard]

"Now review the Wikipedia article en.m.wikipedia.org/wiki/List_of_lists_of_lists and then continue with the next episode, where we will carefully contemplate everything non-compliant. In detail." Perhaps one or two examples of each type of compliant material use is better for the video format, this long list probably looks a lot better in the video manuscript where readers can skip more of the same easily.

[@gljames24]

I feel like flexture, compression, and suction based mechanisms should be added to the list of simple machines.

[@Roi93]

Waiting for part 3! Great job with the series!

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@PiefacePete46]

We have become so accustomed to this in daily life that we don't often notice, (as you pointed out in the video) but we are aware of them to the extent that we form favourites. The satisfying "Click" of a fastener is welcomed, whereas the struggle to open a cheap blow-moulded container with sharp edges often results in a string of profanities! Neat video, thanks.

[@peteferguson7024]

Shipping / packing materials to protect packages. Great series, Thank you.

[@shrishtichaudhary9568]

Wheat plants avoid lodging due to compliance in their stems

[@ninjanner7192]

You covered a lot of examples but I’ll give it a try.

[@PuerinTheHunter]

That was a pretty cool presentation!

[@rakennus7674]

Cables use a compatible mechanism too, right? Thank you for the course. I'm looking forward to chapter 3:

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@SaHuLHKhan]

great series

[@hobocraft0]

Okay, but can we have a version of this video without cut scenes or narration with absolutely no context for purely ASMR purposes.