You work very well, I’m using your studies to understand the change in entropy of a can of soda and to calculate a generated entropy of it warming up, thank you for your work sir
Very instructive video! Thanks! I wonder what happened with the "after" resistance measurent. I tried to locate the error in the multimeter but I couldnt find it in the video. Obviously the difference cannot be 100 ohms.
Hi! I am glad you liked it! Yeah, in the moment of doing the experiment I haven't even realized that the resistance went so far off. I believe that the clips were not holding the wires properly which lead to false readings. I actually still have this exact can with the strain gauge because it is a nice memory for me. I measured the resistance, it is 351.1 Ohms. I don't know how much it is influenced by relaxation and the degradation of the glue but it looks more trustworthy than the 450-something. :)
Thanks for the playlist. It was extremely useful for starting to understand the theoretical and practical usage of strain gauge sensors. Still have some questions and will continue searching about: 1) how to use strain gauge sensors in a full bridge and what will it changed... I expect that it will offset temperature factor and maybe add other direction stresses in complex constructions 2) what is the limits of shapes, where we are allowed to measure stresses and convert them to scale units... should the shapes be very simple, or we can measure stresses in any shape constructions. And if we can, where to apply the strain gauge sensors.
Hi! I am glad that you found is useful! Full bridge is when you use 4 strain gauges in a Wheatstone bridge instead of the resistors. So, the resistors in the bridge _are_ the strain gauges. Depending on the arrangement, you can use it to compensate temperatures or "off-axis" loads. The limit of shapes depend on how well you know mathematics. We use simple shapes so we can calculate the load from the strain easily. If you put it on some weird body, it will be challenging to convert the strain to stress. For some reading, search for the "NI AN078" application note and also for "Applying the Wheatstone Bridge Circuit by Karl Hoffmann".
I think most of the tapes would work just fine. Scotch tape or Kapton tape are definitely good. The main thing is that the tape should be able to pick up the strain gauge, but it should not adhere to the super glue. So, when you mount the strain gauge using the super glue, only the strain gauge will stick be affected by the super glue. After the super glue has cured, you will still be able to peel back the tape and the strain gauge will stay on the surface.
@@CuriousScientist Thank you for your response. I thought this attaching of strain gauge is more complex considering the coefficient of thermal expansion and shrinking factor after cure time of glue. But after watching your uploads it looks like I can fairly get approximate values just by using any super glue.
@@cacophonixgaul6170 You're welcome! As long as you use it for hobby purposes, gently brushing with sandpaper, cleaning with solvent (IPA, acetone) and using superglue is fine. Of course, it is a bit different exercise when you want to do it professionally, but that's for more serious applications.
It is the generic quarter bridge strain gauge formula that you can find in any relevant literature. I put some resources in the description of my other strain gauge videos where I explain their principles.
Hi! I don't have any specific book to suggest because I also get my information from multiple sources. - NI AN087 Application note from National Instruments - Practical strain gage measurements from Omega Engineering - Fatigue Testing and Analysis Yung-Li Lee et. al. (The first couple of pages are about strain gages and bridges) - Applying the Wheatstone Bridge Circuit by Karl Hoffmann. I hope it helps.
You work very well, I’m using your studies to understand the change in entropy of a can of soda and to calculate a generated entropy of it warming up, thank you for your work sir
Glad to hear that my work helps others' work. Don't forget to subscribe! 😎
Nice to keep strain gauges in corner of your kitchen. “Great Experiment “
Thanks!
Very instructive video! Thanks! I wonder what happened with the "after" resistance measurent. I tried to locate the error in the multimeter but I couldnt find it in the video. Obviously the difference cannot be 100 ohms.
Hi! I am glad you liked it! Yeah, in the moment of doing the experiment I haven't even realized that the resistance went so far off. I believe that the clips were not holding the wires properly which lead to false readings. I actually still have this exact can with the strain gauge because it is a nice memory for me. I measured the resistance, it is 351.1 Ohms. I don't know how much it is influenced by relaxation and the degradation of the glue but it looks more trustworthy than the 450-something. :)
Thanks for the playlist. It was extremely useful for starting to understand the theoretical and practical usage of strain gauge sensors. Still have some questions and will continue searching about: 1) how to use strain gauge sensors in a full bridge and what will it changed... I expect that it will offset temperature factor and maybe add other direction stresses in complex constructions 2) what is the limits of shapes, where we are allowed to measure stresses and convert them to scale units... should the shapes be very simple, or we can measure stresses in any shape constructions. And if we can, where to apply the strain gauge sensors.
Hi! I am glad that you found is useful! Full bridge is when you use 4 strain gauges in a Wheatstone bridge instead of the resistors. So, the resistors in the bridge _are_ the strain gauges. Depending on the arrangement, you can use it to compensate temperatures or "off-axis" loads. The limit of shapes depend on how well you know mathematics. We use simple shapes so we can calculate the load from the strain easily. If you put it on some weird body, it will be challenging to convert the strain to stress.
For some reading, search for the "NI AN078" application note and also for "Applying the Wheatstone Bridge Circuit by Karl Hoffmann".
Hi, what kind of tape are you using ?
Hi! You can see it in the video. It is a normal office adhesive tape.
@@CuriousScientist it looked special so I ordered the easy tear medical tape. That should work fine.
I think most of the tapes would work just fine. Scotch tape or Kapton tape are definitely good. The main thing is that the tape should be able to pick up the strain gauge, but it should not adhere to the super glue. So, when you mount the strain gauge using the super glue, only the strain gauge will stick be affected by the super glue. After the super glue has cured, you will still be able to peel back the tape and the strain gauge will stay on the surface.
@@CuriousScientist Thank you for your response. I thought this attaching of strain gauge is more complex considering the coefficient of thermal expansion and shrinking factor after cure time of glue. But after watching your uploads it looks like I can fairly get approximate values just by using any super glue.
@@cacophonixgaul6170 You're welcome!
As long as you use it for hobby purposes, gently brushing with sandpaper, cleaning with solvent (IPA, acetone) and using superglue is fine. Of course, it is a bit different exercise when you want to do it professionally, but that's for more serious applications.
Very useful and well explained video for beginners
Thank you very much!
Where does the formula :
4 × (Vi/Vo) × 1/s come from ?
And more specifically why the 4 constant ? Because 4 resistors ?
It is the generic quarter bridge strain gauge formula that you can find in any relevant literature. I put some resources in the description of my other strain gauge videos where I explain their principles.
Thanks, i will watch the other videos.
Any good "all around" book on teh subject you's recomnend ?
Ty
Hi! I don't have any specific book to suggest because I also get my information from multiple sources.
- NI AN087 Application note from National Instruments
- Practical strain gage measurements from Omega Engineering
- Fatigue Testing and Analysis Yung-Li Lee et. al. (The first couple of pages are about strain gages and bridges)
- Applying the Wheatstone Bridge Circuit by Karl Hoffmann.
I hope it helps.
Very interesting experiment and application for the strain gauges. It was all new to me. Great job! this keep me hooked
Thank you! Strain gauges are very universal tools for a lot of cool experiments. I will keep looking for other uses.
Fantastic fun!!
Thanks!
WOW!!
I am glad you liked it!