Could you put a Prince Rupert's drop? Where should the stress location be? in the tip? or tail? Because you mentioned the stress point marks the weak spots, but I think the area with the highest stress would be in the tip.
The stress should be all over, as the skin of the drop cooled faster than the center. So your stress will be on a radial from center outwards, not along the skin.
When I was an optician, we would determine and try to minimize the stress levels in eyeglass lenses in frames by shaving small amounts of material off the lenses or slightly adjusting the frames to fit the lenses better.
This channel is a gold mine, this guy has been putting so many videos for so much time and he isn't getting as attention as he really deserves! I learn something amazing from every single video, he has now become like a mad scientist in my mind and every video I'm like "oh mah gad what is he up to this time?" XD
stressed birefringence, as said above its because the glass is tempered. Literally the same thing that he discusses in this video stress birefringence is causing the effect you see on your windows.
In the US, windshield glass is laminated not tempered like the side and rear glass (and windshields in some other countries) so the polarized light is seen differently which explains some of these appearances through polarized sunglasses.
Glass artists will also use this method to see if there are stresses in the pieces they make that will cause the piece to eventually fail. This is especially important for anyone doing fusing, as glass has tight tolerances with their Coefficient of Expansion (COE). Glass artists that do slumping and fusing will typically work with glass that has a COE of either 90 or 96, but they RARELY ever mix the two. Because COE 90 and COE 96 glass expands at different rates, this difference will eventually rip the piece apart of you mix the two glass. I have some samples I can send of mostly COE 96 glass, with one sample piece made with a mix of clear COE 96 and White COE 90. (There was a mixup at the shop where I bought the glass, so we ran some test samples. I also bought a pane of COE 96 White to be safe. Yes, the test revealed I received COE 90 in my order. I can send you the test samples.
There is a video "Prince Rupert's Drop at 100,000 fps" which shows it shattering under polarized light, but it would also be nice to see the stress lines in more detail.
If you want someone to talk to or if you want me to pray for something then just let me know. Sorry if this is weird I know I am a stranger. I just like to help. Regardless wish you all the best and have a great blessed day and life! GOD bless
@@Kansas-uo6ks Oh ok cool your very welcome my pleasure. Glad all is good if you actually do want to talk to someone then please don’t hesitate I like to help. Regardless once again my pleasure glad all is good and wish you all the best and have a great blessed day and life! GOD bless
This technique is useful for checking the quality of glass vessels as well. For example, a 5 gallon brewing jug. You can spot the cheap knock offs immediately, and it really, really matters. Lots of people have had the bottoms just fall out of them lately.
Just wanted to say, you do a great job. I love your videos. It's awesome that you are able to make this type of content as your job. American dream! Keep it up.
I wonder if the light is passing through the material and reflecting off the back surface... I don't think you can have polarizing mirrors, just filters. The light from an LCD screen is polarized so that's at least half an explanation right there. I'll have to try that some time.
@@DFPercush Mirrors are polarizers, at least in part. Look up *Brewster's angle.* It works better for insulators, than metals, but at that angle, the light is completely polarized in the plane of the material surface.
I saw this before and I understood how this technique could be used to interrogate the internal stress levels in materials. But seeing the the spoon example was brilliant and revealing. I’m showing this to my kids right now. Thanks James, fine work your are doing there.
"Let's" is "Let us" "Lets" is what you're looking for here :) EDIT: Looks like it's all fixed, and my pedantry is satisfied haha VERY cool video, by the way! I think I could entertain myself for hours breaking plastic spoons and being amazed at how it broke in the "stress spot" every time!
im interested in the uses of this in relation to 3d printing, of different materials, and even different settings and where it changes the stress to such objects... any chance of a video on that?
If you noticed, he was testing *INJECTION MOLDED* items!!! Probably wouldn't show so much on FDM/FFM (lines & layers might obfuscate) whereas Resin might work better as it's more homogeneous with less visible layer lines. Either way, the material would have to be transparent enough for light to pass through for this method of analysis.
@@fookingsog you can find transparent PLA(well...opaque PLA) though there are tons of ifferent materials that can be printed that might show up (ABS, TPU, nylon/carbon fiber, etc..) especially if you just print small prints that are thin enough to use the 2 polarized squares.... then again, thats just my thoughts and opinions, and I could have be wrong... it just *seems* like certain tests could be feasible
0:15 - I saw the short on this and immediately came to find the full video. not sure if you realized what you had here, but that's a Sun Stone. how you can navigate when its grey and overcast and you can't see the sun. the technique covered 1/2 of the stone with a leather strap, that's exactly why it worked. have a sub for showing that!
Not only does Mr. Action Lab guy explain so well what's happening with his experiments, but also the products his sponsors are selling. His hands-on demo of that submersible what-cha-ma-call-it was excellent! I suspect that company saw a bit of a spike in sales very soon after this video was posted.
I worked as an engineer at a dvd/blue ray/game disk manufacturer for many years, this is also how we checked the moulded stress in the disk substrates , not for potential breakage points but because the moulded in stress changes the laser path in an optical drive and can make the disks "warp" over time as they try to release the locked in stress....did you know there are many classes of blue ray ranging from AA to D depending on the data quality after moulding and lacquer deposition imprinting processes... If you have a disk that only plays in "good" players it's probably a lower tier disk and the player has to reassemble the data from the reference/sub frames.
Reminds me of the Japanese anime 空の境界。The "death line" actually exists! The main character's eyes can discern the stress points of everything. Maybe in reality, we can wear polarised goggles to see these stress points, it can be quite useful. Magical 👍🤩
I had a summer job in a glass factory back in 1969. We inspected CRT face plates using this method. If the stress lines showed up as certain colors or size, we would scrap the parts. As in your tests, if you dropped a scrapped piece of glass, it would break right on the stress lines. Great video.
Great video! Funny Micro Center story - I was graphics card shopping at Frys (RIP) and then I went to Micro Center. When I got the to graphics card area, I see the SAME dude... Confused I ask him.... Do you work at Frys?!?! Nope it was his TWIN BROTHER
I remember using this form of stress analysis in high school physics, back in the 1970s. As for the sponsor, Micro Center, I use to visit one near my job, when I worked in Irvine, California. Its good to see them thriving, as their competition Fry's, just called it quits, in early 2021, and have been spiraling downwards, since the mid 20-teens. Another competitor, Computer City, bought it, nearly 20 years ago. Computer City, was a chain owned by Radio Shack, who also hit hard times.
As a polarized light source you can just use your computer monitor. Most monitors nowadays are LCDs which use the polarization of light and nematic liquid crystals to swich (sub-)pixes on or off. Really fascinating technology. The color bands you see in plastics are also used in research on granular matter like sand or corn grains. There you use round disks of plastic in 2D, put some weight on them and then see in the polarized light color bands in the plastic where they press on top of each other and how the force of the weight is distributed through the disks/grains. You then observe these force arcs.
Have no idea if you'll read this or get it or respond to it or whatever. But I just really want to thank you for what you do. This video specifically was very awesome. Really opens your mind and gets you thinking of how you can apply these things that hasn't been already thought of. It really gets people like myself thinking outside the box your experiments show that there's more to your world than meets your eyes and these components need to be applied in those ways.
Congratulations. You’ve actually created mace windu’s shatterpoint ability in real life. I wish there was a way to easily do this on anything at a moments notice.
@The Action Lab 2:00 And if you think about it, that actually explains why the order of colors in the materials are the *same* as the order you get in thin film interference! As the thickness varies, you get a variation in the relevant phase between light rays of differing wavelengths, just like in thin films. This is so cool, and helped me understand the colors from polarizers better, thanks!
When I worked in thermoforming, we would do this all the time to see how the forming of plastic. When the stress was high we needed more heat and when the stress was to low, less heat.
Was waiting for him to break the spoon, for a sec was not sure if he was going to do it but was very satisfying when he did. Great video did not disappoint.
If you were wondering if this would be too hard for an average person to follow along, you would be right on the money. I was lost for a little bit there
Normal light passes through only transparent materials while other spectrum of radiation can penetrate through metals and cement too. Hopefully it can be extended to watch the stress points in real life materials.
I actually saw this technique when watching someone explaining why cheap carboys easily break at the bottom and that Italian made one doesn't have such weaknesses because of proper annealing process.
ummm he really doesn't really care about that the views are low and oh also he continues his career as an education youtuber, just be patient what he makes or creates
i am process engineer of technology of injection molding and we are using those methods to see stress on polycarbonate parts Edit: and i am also your huge fan
I remember an exhibit in the Deutsches Museum in Munich, consisting of an acrylic(?) wrench on a bolt head inside such an optical array. The end of the wrench was accessible so if you pulled on the wrench you could see the changes in stress in the contact points with the bolts head.
I'd like to know more about why the orientation changes the colour patterns. Is it related to the orientation of the stress forces in the material? Like we're look at one "slice" of a coloired 3D graph with radians on one axis and the colour patterns on the plane on the other 2? Or are the colour patterns just based on the random imperfections of the plastic's lattice and we infer stress from that?
Nice! I was hoping your interference colors video would lead into this subject. Now next time you see rainbow colors in a reflection of a plastic item you can understand that it is birefringence.
This is really interesting because one time this happened to me when I was watching tv and putted a plastic Tupperware in top of my glass table, and a rainbow pattern appeared on the plastic. At the time I wondered what was it, and this video finally answered!
@The Action Lab 2:00 I understand that the polarizations are at 90 degrees to each other, but why are the phases of the waves 180 degrees apart? Why does that have to be the case? Wouldn't that depend on how far they traveled through the birefringent material, considering they are traveling at different speeds?
thanks so much for making this vid. I suggested it a while ago, although it might be coincidence. I knew you'd do an awesome job explaining it though. I wish my teachers had been as competent as you because I never did understand how this phenomena actually works until now
Sweet deal on the free storage stuff... luckily, I have a Microcenter about 30 minutes away. I love that place! Cool video, too, by the way. My preschooler loves color spectrums (okay, so do I) and now I know an easy way to show him something cool. Thanks!
Very cool! I always enjoy your videos. I do miss our old collabs with Steve, A.K.A. Rimstarorg, Grant, James Hobbs, and all the old kats but, I hope you have been enjoying your journeys, throughout the scientific spectrum, which it would seem that you have been. Just saying that I pretty much miss you guys! 👊
There are no such things as "left-polarized" and "right-polarized". Circular polarization can be left-handed or right-handed, but calcite is not a circular polarizer anyway. If separates a beam of unpolarized light (mix of vertically and horizontally polarized photons) into two linearly polarized beams (one vertically + one horizontally). Your filters (not polarizers) are linear filters as well (rotating a circular filter won't have any effect on the amount of light making it through).
@gregory morgan It can be, in theory. If the thickness of the birefringent material is just right, and the axes are aligned well, then you will get one polarization that is *90 degrees out of phase* with the other polarization, and that creates circularly polarized light. You then just have to rotate the birefringent material to get clockwise versus counterclockwise rotation.
Wish you woulda put that block on a SCALE and WEIGHED it @2:25 with the light “in and out of it” so we could see if Energy actually does have mass like Einstein said.
![BLACK BAG - Official Trailer [HD] - Only in Theaters March 14](http://i.ytimg.com/vi/Du0Xp8WX_7I/mqdefault.jpg)
Could you put a Prince Rupert's drop? Where should the stress location be? in the tip? or tail? Because you mentioned the stress point marks the weak spots, but I think the area with the highest stress would be in the tip.
Yes
Do you mean the tail?
I was wondering the same thing
@@eekgarink8257 ...seriously... on all of the posts you could comment this on
You comment on a genius idea...
The stress should be all over, as the skin of the drop cooled faster than the center. So your stress will be on a radial from center outwards, not along the skin.
I wonder if this would show my stress points. Man would I light up like a Christmas tree haha.
😂😂😂😂😂😂😂😂
💀
If u are talking about mental stress your brain will be a bulb and if u are talking about stress on muscles, bones etc u will be a human torch
hey man, your corona motor was awesome 🔥🔥
that's like that deer picture in infrared.
Using this sheet we can finally see failure in materials.
Parents: Look what they need to mimic a fraction of our power.
*asian parents
wait no actually just all parents
😂😂😂
@@cleberva im glad i didn't have to correct you lol
Man that show was dark
“How to see failure”
Me: looks in the mirror
Same
Why are you looking in the mirror?
@@windowsxpmemesandstufflol cause he can't look at you 🤦♂️
lol
Lol yep 😂
When I was an optician, we would determine and try to minimize the stress levels in eyeglass lenses in frames by shaving small amounts of material off the lenses or slightly adjusting the frames to fit the lenses better.
This channel is a gold mine, this guy has been putting so many videos for so much time and he isn't getting as attention as he really deserves! I learn something amazing from every single video, he has now become like a mad scientist in my mind and every video I'm like "oh mah gad what is he up to this time?" XD
That's why he has over 3 million subscribers and thousands of views in every video
Explains why my car's rear windshield looks like a mess of rainbow spots when I look at it wearing my sunglasses
Only polarized ones.
@@DrDeuteron Or maybe he means when the light reflects off of the surface of the glass. That partially polarizes the light.
look out an airplane window while wearing polarized sunglasses 🌈
stressed birefringence, as said above its because the glass is tempered. Literally the same thing that he discusses in this video stress birefringence is causing the effect you see on your windows.
In the US, windshield glass is laminated not tempered like the side and rear glass (and windshields in some other countries) so the polarized light is seen differently which explains some of these appearances through polarized sunglasses.
Glass artists will also use this method to see if there are stresses in the pieces they make that will cause the piece to eventually fail. This is especially important for anyone doing fusing, as glass has tight tolerances with their Coefficient of Expansion (COE). Glass artists that do slumping and fusing will typically work with glass that has a COE of either 90 or 96, but they RARELY ever mix the two. Because COE 90 and COE 96 glass expands at different rates, this difference will eventually rip the piece apart of you mix the two glass.
I have some samples I can send of mostly COE 96 glass, with one sample piece made with a mix of clear COE 96 and White COE 90. (There was a mixup at the shop where I bought the glass, so we ran some test samples. I also bought a pane of COE 96 White to be safe. Yes, the test revealed I received COE 90 in my order. I can send you the test samples.
Rupert drops (glass) look really cool! We can see why they “explode” when the tail is broken.
There is a video "Prince Rupert's Drop at 100,000 fps" which shows it shattering under polarized light, but it would also be nice to see the stress lines in more detail.
The way my mom sees failure is by looking at my report card lol
At this rate I won’t be surprised if he renames his channel from ‘The Action lab’ to ‘The Awesome lab’
It was Hydraulic Press Action to start with.
Damn, the title of this video had me hoping that there was a light I could shine on myself to see if I'm a failure...
You're such an alpha at failing that you don't even need lasers or polarizers to be a failure king-wizard. j/k lol
Why do you need the light to tell you what you already know
If you want someone to talk to or if you want me to pray for something then just let me know.
Sorry if this is weird I know I am a stranger.
I just like to help.
Regardless wish you all the best and have a great blessed day and life! GOD bless
@@thechristiangamer7311 Thanks man! I appreciate it. But it was just a joke lol. I'm not actually worrying about being a failure :)
@@Kansas-uo6ks Oh ok cool your very welcome my pleasure.
Glad all is good if you actually do want to talk to someone then please don’t hesitate I like to help.
Regardless once again my pleasure glad all is good and wish you all the best and have a great blessed day and life! GOD bless
This is quickly becoming my favorite channel 👍
Mirrors a great way for me to see a failure
You made me laugh, so therefore you're not a failure. Atleast not in my opinion. Have a nice day.
Task failed successfully
💀
This technique is useful for checking the quality of glass vessels as well. For example, a 5 gallon brewing jug. You can spot the cheap knock offs immediately, and it really, really matters. Lots of people have had the bottoms just fall out of them lately.
Just wanted to say, you do a great job. I love your videos. It's awesome that you are able to make this type of content as your job. American dream! Keep it up.
I've noticed this just looking at reflections of my screen in transparent plastic obdjects, there are rainbow colours in the reflection.
I wonder if the light is passing through the material and reflecting off the back surface... I don't think you can have polarizing mirrors, just filters. The light from an LCD screen is polarized so that's at least half an explanation right there. I'll have to try that some time.
Yes, same here!
@@DFPercush Mirrors are polarizers, at least in part. Look up *Brewster's angle.* It works better for insulators, than metals, but at that angle, the light is completely polarized in the plane of the material surface.
*Much better and intuitive than those boring black board classes* 👍
"How to see a failure"
Me: **Accidentally does this whole thing to myself** as expected
I saw this before and I understood how this technique could be used to interrogate the internal stress levels in materials. But seeing the the spoon example was brilliant and revealing. I’m showing this to my kids right now. Thanks James, fine work your are doing there.
Finally a flashlight that my parents can use to find me.
"Let's" is "Let us"
"Lets" is what you're looking for here :)
EDIT: Looks like it's all fixed, and my pedantry is satisfied haha
VERY cool video, by the way! I think I could entertain myself for hours breaking plastic spoons and being amazed at how it broke in the "stress spot" every time!
And here i am, complaining about how every fifth youtube video is full of "let me". As like i can say "no, i won't let you do that". Huh...
Lettuce. :)
The thumbnail "How to see failure" I immediately thought I can just look into a mirror.
I don’t be knowing what this man be talking about. But I like watching it.
I am a chemist and understand this stuff but always learn something new
im interested in the uses of this in relation to 3d printing, of different materials, and even different settings and where it changes the stress to such objects...
any chance of a video on that?
If you noticed, he was testing *INJECTION MOLDED* items!!! Probably wouldn't show so much on FDM/FFM (lines & layers might obfuscate) whereas Resin might work better as it's more homogeneous with less visible layer lines. Either way, the material would have to be transparent enough for light to pass through for this method of analysis.
@@fookingsog you can find transparent PLA(well...opaque PLA) though there are tons of ifferent materials that can be printed that might show up (ABS, TPU, nylon/carbon fiber, etc..) especially if you just print small prints that are thin enough to use the 2 polarized squares....
then again, thats just my thoughts and opinions, and I could have be wrong...
it just *seems* like certain tests could be feasible
0:15 - I saw the short on this and immediately came to find the full video. not sure if you realized what you had here, but that's a Sun Stone. how you can navigate when its grey and overcast and you can't see the sun. the technique covered 1/2 of the stone with a leather strap, that's exactly why it worked. have a sub for showing that!
Nice to watch in real time. We used to use FEA, Finite element Analysis to find the stress points in any element.
I see failure everytime I look at a mirror lmfao
Not only does Mr. Action Lab guy explain so well what's happening with his experiments, but also the products his sponsors are selling. His hands-on demo of that submersible what-cha-ma-call-it was excellent! I suspect that company saw a bit of a spike in sales very soon after this video was posted.
I worked as an engineer at a dvd/blue ray/game disk manufacturer for many years, this is also how we checked the moulded stress in the disk substrates , not for potential breakage points but because the moulded in stress changes the laser path in an optical drive and can make the disks "warp" over time as they try to release the locked in stress....did you know there are many classes of blue ray ranging from AA to D depending on the data quality after moulding and lacquer deposition imprinting processes... If you have a disk that only plays in "good" players it's probably a lower tier disk and the player has to reassemble the data from the reference/sub frames.
Being able to predict the breaking point on the spoon was I think one of the coolest parts of any video you've ever done.
"How to see failure"
opens front camera on phone
This is very cool. You only demonstrated with clear or translucent materials. Can you use this technique with an opaque item like a bridge beam?
They use ultrasound to detect micro fractures in racehorses before they shatter, so can rest up for a while instead..
Reminds me of the Japanese anime 空の境界。The "death line" actually exists! The main character's eyes can discern the stress points of everything. Maybe in reality, we can wear polarised goggles to see these stress points, it can be quite useful. Magical 👍🤩
I had a summer job in a glass factory back in 1969. We inspected CRT face plates using this method. If the stress lines showed up as certain colors or size, we would scrap the parts. As in your tests, if you dropped a scrapped piece of glass, it would break right on the stress lines. Great video.
This was a certified" hOOd" classic
Great video! Funny Micro Center story - I was graphics card shopping at Frys (RIP) and then I went to Micro Center. When I got the to graphics card area, I see the SAME dude... Confused I ask him.... Do you work at Frys?!?! Nope it was his TWIN BROTHER
Schroedinger's PC Technician...😂🤣😆
You always have such interesting material!!! And unique) Thank you!
Matrix boy:
"There is no spoon"
Action Lab:
"Hold my polarizer"
I remember using this form of stress analysis in high school physics, back in the 1970s.
As for the sponsor, Micro Center, I use to visit one near my job, when I worked in Irvine, California. Its good to see them thriving, as their competition Fry's, just called it quits, in early 2021, and have been spiraling downwards, since the mid 20-teens. Another competitor, Computer City, bought it, nearly 20 years ago. Computer City, was a chain owned by Radio Shack, who also hit hard times.
Action lab: how to see failure
Steven he’s dad: I’ll take your entire stock
I'll buy 5
As a polarized light source you can just use your computer monitor. Most monitors nowadays are LCDs which use the polarization of light and nematic liquid crystals to swich (sub-)pixes on or off. Really fascinating technology.
The color bands you see in plastics are also used in research on granular matter like sand or corn grains. There you use round disks of plastic in 2D, put some weight on them and then see in the polarized light color bands in the plastic where they press on top of each other and how the force of the weight is distributed through the disks/grains. You then observe these force arcs.
Very interesting to use light and polarization to find weaknesses in materials. Great video
Have no idea if you'll read this or get it or respond to it or whatever. But I just really want to thank you for what you do. This video specifically was very awesome. Really opens your mind and gets you thinking of how you can apply these things that hasn't been already thought of. It really gets people like myself thinking outside the box your experiments show that there's more to your world than meets your eyes and these components need to be applied in those ways.
Great Video.This channel is gold.
As we know Einstein said E =MC2
Meaning we should be able to see
With the right Scale that light and sound waves and electricity have mass
Congratulations. You’ve actually created mace windu’s shatterpoint ability in real life. I wish there was a way to easily do this on anything at a moments notice.
Seriously I enjoy your content so much.
@The Action Lab 2:00 And if you think about it, that actually explains why the order of colors in the materials are the *same* as the order you get in thin film interference! As the thickness varies, you get a variation in the relevant phase between light rays of differing wavelengths, just like in thin films. This is so cool, and helped me understand the colors from polarizers better, thanks!
''How to see Failure'' you don't even need to test it, I can already see it by looking at a mirror
Thank you for yet another fantastic video! Can't beat a bit of stress!
You make me fall in love with science everyday. Thank you so much for that!
so weird seeing micro center advertising still. been going there for so long feeling like a secret club
"How to see failure"
Steven He: perfect, just what I needed to see my son's failures
It didn't take that long to find a Steven He connoisseur
This man is the smartest person I've ever found on RUclips
When I worked in thermoforming, we would do this all the time to see how the forming of plastic. When the stress was high we needed more heat and when the stress was to low, less heat.
So many “looking in the mirror to see a failure” comments…
Guys pls be a little more original XD
They are failures. What did you expect?
Was waiting for him to break the spoon, for a sec was not sure if he was going to do it but was very satisfying when he did. Great video did not disappoint.
If you were wondering if this would be too hard for an average person to follow along, you would be right on the money. I was lost for a little bit there
Normal light passes through only transparent materials while other spectrum of radiation can penetrate through metals and cement too. Hopefully it can be extended to watch the stress points in real life materials.
“How to see failure”
Asian parents: look what they need to mimic a fraction of our power
I have SO many questions and ideas about how this could help us understand our planet. Very cool!
I want to know more about this experiment like if there are any formula applied or any calculations involved. Can someone please help me.
Asian parents: “look at what they need to mimic a fraction of our power”
All dreamers out there this is temporary situation it will pass don't lose hope your success will come just keep moving forward don't give up 💪 💪 💪 ✊
I actually saw this technique when watching someone explaining why cheap carboys easily break at the bottom and that Italian made one doesn't have such weaknesses because of proper annealing process.
Support
Pls continue even tho your views is low
Cause you are teaching us
ummm he really doesn't really care about that the views are low and oh also he continues his career as an education youtuber, just be patient what he makes or creates
One of the coolest vids on the channel. At least lately
If this can show my computer dying, I would practically become a magician.
This channel feels like an infinity source of forbidden knowledge 😁 Keep the content coming my dude :)
I've got a question for the action lab,
You've always used the pressure chamber for decreasing pressure, but have you increased pressure before?
i am process engineer of technology of injection molding and we are using those methods to see stress on polycarbonate parts
Edit: and i am also your huge fan
I learned this ages ago but didn't know what it was called. Cool
This is why you can't wear polarized sunglasses when flying a small airplane; you can see all of the stresses in the windshield! Very annoying.
Steven's dad : "FAILURE!"
I remember an exhibit in the Deutsches Museum in Munich, consisting of an acrylic(?) wrench on a bolt head inside such an optical array.
The end of the wrench was accessible so if you pulled on the wrench you could see the changes in stress in the contact points with the bolts head.
I'd like to know more about why the orientation changes the colour patterns. Is it related to the orientation of the stress forces in the material? Like we're look at one "slice" of a coloired 3D graph with radians on one axis and the colour patterns on the plane on the other 2? Or are the colour patterns just based on the random imperfections of the plastic's lattice and we infer stress from that?
Nice! I was hoping your interference colors video would lead into this subject. Now next time you see rainbow colors in a reflection of a plastic item you can understand that it is birefringence.
This is really interesting because one time this happened to me when I was watching tv and putted a plastic Tupperware in top of my glass table, and a rainbow pattern appeared on the plastic. At the time I wondered what was it, and this video finally answered!
How to show failure:
Sweats nervously...
@The Action Lab 2:00 I understand that the polarizations are at 90 degrees to each other, but why are the phases of the waves 180 degrees apart? Why does that have to be the case? Wouldn't that depend on how far they traveled through the birefringent material, considering they are traveling at different speeds?
Haha nevermind! I just saw that you put in a note that it depends on the sample thickness. That makes way more sense haha
but this work only with transparent materials right?
thanks so much for making this vid. I suggested it a while ago, although it might be coincidence.
I knew you'd do an awesome job explaining it though. I wish my teachers had been as competent as you because I never did understand how this phenomena actually works until now
No wonder that I see one big pointy head at some people when I have my polorized sunglass on. They are just really stressed out.
As always, an excellent video.
Sweet deal on the free storage stuff... luckily, I have a Microcenter about 30 minutes away. I love that place! Cool video, too, by the way. My preschooler loves color spectrums (okay, so do I) and now I know an easy way to show him something cool. Thanks!
Very cool! I always enjoy your videos. I do miss our old collabs with Steve, A.K.A. Rimstarorg, Grant, James Hobbs, and all the old kats but, I hope you have been enjoying your journeys, throughout the scientific spectrum, which it would seem that you have been. Just saying that I pretty much miss you guys! 👊
finally, I can see myself more clearly
There are no such things as "left-polarized" and "right-polarized". Circular polarization can be left-handed or right-handed, but calcite is not a circular polarizer anyway. If separates a beam of unpolarized light (mix of vertically and horizontally polarized photons) into two linearly polarized beams (one vertically + one horizontally). Your filters (not polarizers) are linear filters as well (rotating a circular filter won't have any effect on the amount of light making it through).
@gregory morgan It can be, in theory. If the thickness of the birefringent material is just right, and the axes are aligned well, then you will get one polarization that is *90 degrees out of phase* with the other polarization, and that creates circularly polarized light. You then just have to rotate the birefringent material to get clockwise versus counterclockwise rotation.
Need to use this method on different types of metals _and_ alloys
Watching this while stoned was bloody amazing bro
The beginning of this video was like watching a technical jargon overload video. 🤯
So this is my parents vision
Wonderful repurposing of single use cutlery. So cool!
Wish you woulda put that block on a SCALE and WEIGHED it @2:25 with the light “in and out of it” so we could see if
Energy actually does have mass like Einstein said.
You wouldn't be angle to measure any difference, as the amount is nanoscopic.
Put that block on a microgram or Precision scale and weigh it before putting light through it and After with different lights / lasers in it
Every time you prove to us that science is magic.
Steven He would be so happy with beeing able to see failure
Goshhhh... You are from another world.
👌👌👌