I'm wondering if anyone in the community has experience with foil strain gauges used to measure strain components that are normal to the plane of the sensor? If the strain gauge were pressed between two large flat plates, for example, would there be enough deformation of the conductive path to cause a measurable change in resistance?
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1$\begingroup$ If you are allowed to take the plates apart you can use a contact pressure tape, e.g., sensorexpert.com $\endgroup$– Biswajit BanerjeeCommented Jul 23, 2018 at 21:14
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$\begingroup$ That looks like a much simpler way to go. Thanks for the tip! $\endgroup$– Ryan LarsonCommented Jul 24, 2018 at 16:54
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Mostly, strain gauges are pasted on a surface and give indications about the in-plane strains. A Load cell is a device that uses strain-gauges and can measure the force perpendicular to the surface. Load cells in wiki Can you please describe what specifically do you want to measure?
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$\begingroup$ We're trying to measure actual pressures across a matched mold surface, so we have to use transducers that have a thickness less than or equal to the intended part thickness (~0.090"). If there's a different type of sensor that would work better, I'd be very interested. $\endgroup$ Commented Jul 23, 2018 at 19:25
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$\begingroup$ Strain gauge measures the condition of plane stresses not strain, because there is no normal stress acts on the surface upon which we attach the strain gauge. $\endgroup$– user14407Commented Sep 11, 2018 at 18:56
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1$\begingroup$ Strain gauge measures strain, not stress. The stress is calculated from the strains and by knowing the Young modulus. $\endgroup$ Commented Sep 12, 2018 at 20:50