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I'm going to build a test jig so I can load the test samples consistently. It will be a 8' long 2x6 (or 2x4) that is reinforced with a wire and strut on the top to limit the bend in the wood. The composite sandwich samples will be supported on two "lines" underneath with short pieces of round closet pole stock that are 10" apart, and the weight will be loaded on a "line" with another piece of closet pole stock in the center of the top.
I'll start with the weight right on top of the center bearing, and then 1' out on the 2x, and then 2' then 3', etc. At the outer end of the 8' 2x, I'll have a wire "needle" that will indicate the deflection "amplified" by the length of the 2x arm, so small differences in deflection can be seen and quantified.
If this doesn't stress the samples enough, I'll go to a cantilevered setup.
Who wants to help me with the math? I will photograph the jig, and I can draft on the dimensions in DataCAD, and post that, along with the data.
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