I have to understand some papers concerning pzt actuated membranes for a project and I keep stumbling upon d31 or d33 strain coefficients. Can someone plz explain to me what do the 31 and 33 numbers refer to, regarding the geometry?(adsbygoogle = window.adsbygoogle || []).push({});

I'm not sure I'm getting this so please feel free to ask for clarifications.

Thank you all in advance.

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# Describing pzt planes and corresponding coefficients

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