The Ingenious Design of Strain Gauges

Рет қаралды 159,295

5 ай бұрын

Watch my bonus video on load cells: nebula.tv/videos/the-efficien...
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This video explores the fascinating world of strain gauges, these clever little devices that combine elements of mechanical engineering, electrical engineering, and materials science to give us a way of measuring the deformation on the surface of an object.
3D Model Credits:
Hand model modified from "Hand" by Soady - cgcookie.com/projects/realist...
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This will allow me to create more high quality videos covering a range of engineering topics.
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The Efficient Engineer is a channel aimed at mechanical and civil engineers. The mission is to simplify engineering concepts, one video at a time!
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Пікірлер: 141

@TheEfficientEngineer 5 ай бұрын

What are some other interesting strain gauge applications? If you're interesting in the companion video on load cells you can check it out on Nebula at this link: nebula.tv/videos/the-efficient-engineer-how-do-load-cells-work

@A.UNIVERSE.within 4 ай бұрын

Hey how about ARTIFICIAL GRAVITY 🎉 😁 I'm a regular ol sky-walker😂🎉 yay for me kzfaq.infoaw2Zjrv6zkw?si=DA2IPe0O_CNWZn1p

@starky8833 3 ай бұрын

Got some video ideas from my mechanical engineering career : Metal Additive Manufacturing Ceramics Super alloys Circuit boards :o Coatings & Machining tooling

@removename 5 ай бұрын

If this guy produces 3000 hours of content this channel will effectively replace need for mechanical engineering colleges

@nickbell3546 5 ай бұрын

Well you'd still need to do practice problems to prove you understand the concepts, but I agree with your sentiment lol

@removename 5 ай бұрын

@@nickbell3546 ofcourse practice is most important I am just speaking in hyperbole to convey a point

@mattmurphy7030 5 ай бұрын

@@removenameI don’t think you’ve been to engineering school if you think some KZfaq videos are a sufficient replacement. At least not in the US

@freshrockpapa-e7799 5 ай бұрын

@@mattmurphy7030I don't know what's more hilarious, the fact that you didn't understand they are being hyperbolic, or the fact that you think US engineering schools are good.

@ohsweetmystery 5 ай бұрын

@@mattmurphy7030There is no reason that educational videos cannot replace engineering universities. I went to Caltech. My siblings went to MIT. All back when both of these schools were meritocracies instead of the woke garbage factories they are becoming now.

@Flaakk 5 ай бұрын

This is gold! You're one of the few KZfaqrs who has not once compromised on quality. Your videos have taught me a lot and have ignited my passion for studying and working in engineering.

@kwakeham 5 ай бұрын

This is probably the best concise explanation I can send to people about what I do. However, there is one thing that is wrong. Passive temperature compensation is what is described as "active" by using a second gage in the half bridge. ACTIVE is measuring and compensation through thermal calibration, EG you actively have to do something such as math such as read a temperature sensor (RTD, thermistor, etc) then calculate the new impact. When it's just one, we tend to say it's uncompensated and NOT passive. There are all extreme temperature cases where you'd select a different STC code than for the underlying material as you might be in a different area of the curve and can get better performance in high temp or cyro applications.

@sjkebab 5 ай бұрын

Really? I always thought that relying on the STC of the gauge was sufficient for isothermal tests and was passive. I too have used the word active for describing the half bridge technique. I've certainly never used your method of active compensation, however I've never used a gauge outside of -40C to +200C so the need has never really been there...

@aaronacj 5 ай бұрын

Never met a strain gauge.

@fadedlamp42 4 ай бұрын

@@aaronacj Severely underrated comment

@ande446 4 ай бұрын

Fantastic quality as always, i love that you never compromise on quality and uploads your videos when they are done and up to your high standards!

@angelobohm7601 5 ай бұрын

This time I have to leave a comment. Today I was discussing with a colleague how principle strains from my simulation can be compared to our future experiments. And then you upload this video… Thank you 🙏🏼 😊

@andrijasaviccsavic1124 5 ай бұрын

Fun fact, wheatstone bridge is also used for temperature measuring, but thermistor Is placed instead of gauge.

@gopackgo4036 4 ай бұрын

Thermistor or rtd

@chaumas 3 ай бұрын

You do a really great job of presenting new information and then pacing things to let the viewer guess ahead at the next step, and it makes your videos really enjoyable. For example, I loved the way you showed the multiple gauge bridge configurations first, raising the question “why would you do that?”, then moved on to talking about thermal expansion, and gave me just enough time to excitedly shout “oh you could put one on an unstrained reference material!” at the screen.

@littlehunter1955 5 ай бұрын

thank you guys for putting the effort out to produce such quality content, this is my second year in ME and I see a long future for me in this channel. Keep up the good work

@charlie2640 5 ай бұрын

There seem to be two people that invented the strain gauge at essentially the same time, Arthur Ruge and Edward Simmons. Simmons had a lengthy legal fight with Caltech over the patent rights. Simmons became a fairly notable eccentric later in life and was a fixture around the Caltech campus.

@ohsweetmystery 5 ай бұрын

Renaissance Ralph

@gopackgo4036 4 ай бұрын

That’s the problem with developing things at universities, they get to share the credit.

@MSA206 4 ай бұрын

brilliant video thanks for all your work, your ability to unpack complex subjects is unparalleled

@hi-ld4gg 5 ай бұрын

Would be cool if you could cover different ndt methods used for different material. A bit more on the niche side of mechanical engineering but equally important

@cookiemaria780 3 ай бұрын

absolutely wonderful video! I hope to see more!

@sjkebab 5 ай бұрын

Great video. I'll be using this as a source for training. Thank you!

@hugonunes 5 ай бұрын

I am wondering what softwares can be used to create these fantastic animations? Congrats for an amazing video!

@frikkieramabolo172 5 ай бұрын

He said he uses Blender

@TheEfficientEngineer 5 ай бұрын

Yup!

@aaabbb-py5xd 5 ай бұрын

@@TheEfficientEngineer How long does it take to make the video (excluding the time spent on planning and refining what you wish to present)?

@rjhornsby 5 ай бұрын

@@aaabbb-py5xda rule of thumb for general post production you can figure about an hour of work for every minute of finished video. So 20 minute video -> 20 hours editing. I’m not an animator, so I don’t know how much that adds or overlaps with the edit process.

@aaabbb-py5xd 5 ай бұрын

@@rjhornsby Thanks for the input. It seems like a full time commitment, which I shouldn't mind since I can spend 20 hours straight playing games xD

@mehmetdonmez7651 4 ай бұрын

excellent content, very informative and very simply explained

@syedsuhailahmed2868 5 ай бұрын

I was desperately waiting for the new video.

@KellTainer22 2 ай бұрын

Great video as always! Merci!

@rahebhafezzadeh8033 4 ай бұрын

I don't know how to thank you for creating and sharing this content. Was very useful.

@mechs101 3 ай бұрын

You keep impressing me everytime. good job mate and thank you

@Readbooks6800 5 ай бұрын

Amazing and highly informative video. Thanks for publishing such good content😊

@antialias4205 Ай бұрын

ty - this is sooooo good

@JageeAgain 4 ай бұрын

Excellent description of strain gages and the Whetstone bridge.

@SorokinAU 4 ай бұрын

very good job! thank you very much!

@raxirex6443 5 ай бұрын

I have used a similar mechanism in one of my projects, very useful

@110Genesis 5 ай бұрын

Awesome as always

@sunlitrhyme8049 5 ай бұрын

Congrats on 1M subs! As a mechanical engineering student you're helping me so much :)

@peacekeeper9687 5 ай бұрын

Very informative 👍👍👍👍

@Zucsebe 5 ай бұрын

Love your work

@KnowArt 5 ай бұрын

damn, well done! Looks an awful lot like a device I'm currently making a video about, but luckily it's completely different

@10vogels Ай бұрын

A perfect video.

@giosuco8202 5 ай бұрын

love your content

@brynmrsh 4 ай бұрын

Thank you so much for making videos like this. I am going to share this with my boss, who has a PhD in Material Science, so he can understand how I am going to use a strain gauge to compensate for thermal expansion in my experiments...

@sagarawal4835 5 ай бұрын

I love this channel

@Zyed_YouTube 5 ай бұрын

Great to see that

@dilshodmajidov3201 5 ай бұрын

Very nice video

@griffinfurlong 5 ай бұрын

Keep up the good work! This is a perfect channel for civil students to visualize their study materials. If you ever want to collab, let me know!

@user-yk9su3qo8j 5 ай бұрын

Congratulations for 1M🎉

@VoidHalo 5 ай бұрын

I use strain sensors as a hobbyist to experiment with measuring impact force, energy, deceleration. With my oscilloscope, I can measure the strain over time, which gives me the duration of the collision, and thus the decelerative G-load on the projectile, for example. And I don't even need an Arduino!

@mattmurphy7030 5 ай бұрын

Arduino can’t even start to keep up with your osmelloscope

@sjkebab 5 ай бұрын

Be careful with high speed strain measurements. The gauge itself has a frequency bandwidth which if not allowed for can give low readings. Rule of thumb is smaller gauge length is faster, but I'm not an expert in dynamic measurements so other factors probably come into play.

@alexkorzenewski4250 5 ай бұрын

Outstanding content. I am a retired petroleum engineer, but my daughter is a civil engineer/project manager for a pipeline design and build company. I will be giving her a subscription to Nebula.

@Edmund-kg7fp 23 сағат бұрын

Brilliant

@randomas1977 5 ай бұрын

I love your content. Some remarks: at 0:24, there seems to be intense curvature beyond the supports which I think is wrong. At 13:52 I think that the shear strains (green half-arrows) have the wrong directions.

@grezamisoit 5 ай бұрын

Wonderful video! Thanks!

@thescientist1839 4 ай бұрын

Good 👍

@BManHops 5 ай бұрын

hearing the words Mohr’s Circle gave me flashbacks to AE lab like i was back in Nam 😂

@BB-gr9hq 2 ай бұрын

Here is a fun fact to know and tell. If you take a strain gauge, and wire it to a capacitor bank, and then, after charging the capacitor bank, you dump this current onto the strain gauge, the strain gauge behaves like an exploding bridge wire detonator (EBWD).

@jonnathanramirez3376 3 ай бұрын

Can you make one on method of characteristics? That'd be great!

@michaelmoorrees3585 5 ай бұрын

I use to see one of the inventors of the strain gauge, Edward Simmons, rummaging in the electronics part stores (when they still existed) in Pasadena, CA, from the 1970s thru 1990s. He was a bit eccentric, but all the other old timers that engage with him, did it with much respect. He made a fortune, but not from the strain gauge, but investments in oil companies.

@ohsweetmystery 5 ай бұрын

Renaissance Ralph, as he was called, always wore opaque tights, some kind of short toga outfit, sandals and a hat, and was often seen on campus at Caltech. He was rumored to sometimes wash his hair in the fountains, but I never actually saw that happen.

@morkovija 4 ай бұрын

highest grade of content right here gents and ladies

@harshaperavarapu1042 5 ай бұрын

Please upload frequently I am waiting for your videos 🥲🥲

@arpankoley5245 4 ай бұрын

Can you please attach some study materials in all of your videos? Already your videos are top notch. Including that factor will complement the video and guide the viewer for a comprehensive learning.

@ibrahim_shaikh-_ 2 ай бұрын

Can you please create a video on : industrial hydraulics and pneumatics

@krishnaholla7398 Ай бұрын

Please make video on cfd

@jingrao1438 3 ай бұрын

Is there any recommended manufacturer for purchasing strain gauges? Many thanks!

@kindlin Ай бұрын

A couple 'funny' animations: 0:05 The ends move up and down, a lot, even tho the load is only between the supports. The straight ends should have no curvature outside of the supports. 4:36 Wow, that copper stretches a LOT, like 300%, and then goes right back to its original shape. That doesn't work for many reasons, not the least of which is simple conservation of mass, the rod's diameter never changes while expanding in volume 3 times.

@megharajkotiwale 27 күн бұрын

If the Person don’t like these concepts, he will try to understand after watching this well explained Video & Narration May I know,Which are the tools you used to create these videos?

@Secretgeek2012 5 ай бұрын

So, how do they measure the strain that the strain gauge measures?

@MrAbrandao 5 ай бұрын

How they bond it to the metal?

@tachyeonine 5 ай бұрын

Great explanation as always, please remember to create content and upload 😅

@vaishnaviyernale2292 5 ай бұрын

Thanky you❤

@luis_rolddan 5 ай бұрын

Just i want to study, thanks!

@ivanperica3731 5 ай бұрын

Excellent! But what is a micro strain(in this context it is a unit of measure??)??

@sjkebab 5 ай бұрын

1 strain is stretching something to be 100% longer. Ie If I have a 1m length of material and I pull it until it's 2m long, it has a strain of 1. If I pull it until it's 1.001m, it has 1 millistrain. If I pull it until it's 1.000001m long, it has 1 microstrain. So 1 microstrain isn't very much! Fun fact for you if you're interested in such things: strain is a dimensionless quantity. An area is length squared. A volume is length cubed. Strain is length ÷ length, and therefore has no dimension.

@roliveira2225 5 ай бұрын

Excellent!

@Tuffaha 5 ай бұрын

great vid!

@abdelkaioumbouaicha 5 ай бұрын

📝 Summary of Key Points: 📌 Strain gauges are crucial tools in engineering for measuring how objects deform under loading, aiding in structural integrity monitoring and performance optimization. 🧐 The electrical resistance strain gauge is a common design that measures strain by detecting changes in electrical resistance as the object deforms, with materials like Constantan being popular due to stability over temperature. 🚀 Wheatstone bridge circuits are used to accurately measure small changes in resistance of strain gauges, enabling precise strain calculations and monitoring. 💡 Additional Insights and Observations: 💬 "Understanding the basic concept of strain is crucial for appreciating how these devices work." 📊 Gauge factors and material properties play a significant role in determining the sensitivity and accuracy of strain gauges. 🌐 Temperature compensation methods like active and self-compensation are essential to mitigate errors due to thermal expansion. 📣 Concluding Remarks: Strain gauges are versatile devices that play a vital role in engineering applications, offering precise measurements of strain and enabling detailed analysis of structural behavior. Understanding their principles and applications is key to ensuring the reliability and efficiency of various mechanical systems. Generated using TalkBud

@Trey4x4 4 ай бұрын

Banks use strain gauges in the building process of vaults

@adamsapplespie 5 ай бұрын

0:00 I did that in a lab today!!!

@pvic6959 5 ай бұрын

did someone say FULL BRIDGE REC----- oh sorry wrong full bridge

@TheDustysix 4 ай бұрын

Does a strain gauge have a built in memory for analysis later?

@90_98 3 ай бұрын

@TheDustysix 3 ай бұрын

@@90_98 Too Bad.

@makwanayash6022 3 ай бұрын

One video for unite conversation SI unit change

@SelectLOL 5 ай бұрын

@ 4:38 the red lead for the multimeter is in the wrong place 😆

@TheEfficientEngineer 5 ай бұрын

Whoops!

@johnNamikaze 5 ай бұрын

ATIVA A FAIXA DE AUDIO. POR FAVOR

@cleisonarmandomanriqueagui9176 5 ай бұрын

For concrete . can we use guges like this ? lvdt are better for concrete , am i right ?

@mattmurphy7030 5 ай бұрын

Bond the gauge to concrete using epoxy and it will work

@sjkebab 5 ай бұрын

LVDTs measure deflection not strain. Rule of thumb for strain measurement of concrete is gauge length >=3× the size of your aggregate.

@WildEngineering 5 ай бұрын

hmm so as an EE i highly doubt that wheatstone bridges are used for anything strain gauge when you can have a constant current source and a differential amplifier to measure the voltage across it and divide by the fixed current source for the resistance measurement

@sjkebab 5 ай бұрын

You'd be wrong. Wheatstone bridges are used all the time in this application. Assuming 15mA excitation, 350 gauge and 2.0 gauge factor, the difference between readings for a 1uStrain measurement is about 10.5uV on a 5.25V reading. Not impossible, but unwieldy and uncompensatable. Wheatstone bridges are used because it's a lot cheaper, and you can use compensation techniques. The downside is that you need high precision/very stable resistors in your circuit. Think $20 to $50 per resistor

@sjkebab 5 ай бұрын

I should also mention that by using the WS bridge, you're measuring a voltage relative to 0, therefore amplification is easy.

@lancehadfield 5 ай бұрын

The wheatstone bridge offers a number of advantages for wiring strain gages in various configurations to cancel out unwanted effects on the strain gage. The full bridge configuration in particular is very useful. For example, a full bridge using the "chevron" rosette shown at 16:16 can be wired up to cancel strains caused by off-axis and bending loads and only respond to strains induced by torque. Constant current can also be used in strain gage measurements, but there are disadvantages there too.

@WildEngineering 4 ай бұрын

@@lancehadfieldwhat are those disadvantages? I can make nano amp accurate temperature compensated current sources, theyre easy.

@SB_3.1415 5 ай бұрын

Wasn't this channel called real engineering or something?

@prashantsihmar1314 5 ай бұрын

Strain gauges and strain rossets are they same ?

@mattmurphy7030 5 ай бұрын

Strain rosette is a particular arrangement of strain gauges that provides multiple dimensional measure at once

@samimas4343 5 ай бұрын

I assume those devices take into account change of material due to change in temperature.

@mattmurphy7030 5 ай бұрын

You have to factor that in by your own curves using thermocouples

@sjkebab 5 ай бұрын

Techniques are mentioned in the video.

@afaisal91 4 ай бұрын

I should have paid you the tuition fee of my engineering college

@rsnmaa 5 ай бұрын

0:27 cable stayed bridge with piers on the main span --> not efficient! God damn I came here looking for efficiency and this is what I get...

@mattmurphy7030 5 ай бұрын

So you came to the wrong place, you problem

@UltrawideBenchmarks 5 ай бұрын

Is the narrator the gaming historian?

@TechMasterRus 5 ай бұрын

Didn't cover the full bridge.

@Lumpify. 4 ай бұрын

Bruh the multimeter lead is in current socket not ohms lmao

@petersplat6164 Ай бұрын

Oh come on, do you really expect us to believe that strain gauges are real?

@socas_nic 5 ай бұрын

This video was uploaded too late 😢

@RESHI-SUHAIB 5 ай бұрын

..👍

@diepieche 5 ай бұрын

nothing new for people already involved in weighing. Wheatstone bridge circuit is employed No electrical. Just pure electronics required. Easy said in theory, in practical a lot of factors must be considered. 😅😅

@sjkebab 5 ай бұрын

I'm constantly amazed at the subtleties involved in the governing equations. As you say, simple in theory, but complicated in its nuances.