Since I’ve been playing with strain gauges for a while, I wanted to find some fun and educational applications of them. I thought I can estimate the pressure inside a soda can by using a strain gauge. I think this is a good demonstration for both strain gauges and pressure vessels. It is a very cheap but powerful experiment with refreshing results.
The basic principle is the following:
I measure the change of the strain in the shell of the soda can;
I calculate the stress change upon the pressure release using Hooke’s law ( σ = ε * E );
This stress change is the change in the hoop stress induced by the pressure change of the CO2 gas;
Based on the thin-walled pressure vessel formulas, I obtain the internal pressure.
I looked up some other resources on the internet and it seems like my result is not so bad. The video I found on YouTube ([ Ссылка ]) measures very similar values with a much more professional system. And the collection of data I found ([ Ссылка ]) scatters around my value too.
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