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I'm with [cut]cRiPpLe_rOoStEr[paste].
My concern is that you are testing with thin rectangular strips and will extrapolate to the gross structure.
Your results might be affected by edges or corners. I'd test by using a circular clamp aka two pieces of pipe; and drop a ball in the center. To isolate the behavior of the material en mass. At that particular thickness. In other words you would be able to test the performance of thickened edges and flanges as well as a thin skin.
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