Add polybeam to data directory #326
Description
In the polybeam simulation demo notebook, we define a polybeam that is similar to the Fagnoni beam. We should move this to a data file that can be read in (at least the coefficients).
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In the polybeam simulation demo notebook, we define a polybeam that is similar to the Fagnoni beam. We should move this to a data file that can be read in (at least the coefficients).