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We observed a small amount of internal stress (manifesting as bending) within our main sample, but have ruled out thermal and ply orientation as reasons for this occurring.
Measurement (&Calculations)
Google sheet where I kept measurements
Young's Moduli
specimen a 1kN.xlsx (E = 92.743 GPa w/ R^2 = 0.9969)
specimen b 5kN.xlsx (E = 71.694 GPa w/ R^2 = 0.9999)
specimen c 5kN.xlsx (E = 121.13 GPa w/ R^2 = 0.9993)
specimen c 1kN.xlsx (E = 121.91 GPa w/ R^2 = 0.9979)
As of 11/20/2019 we have only been able to test 3 samples with the methods detailed above. Specimen a was tested first, followed by specimen c. We determined that not only would the specimen's be safely (without fear of failure) up to 5kN, we found that the data agreed with itself between 1kN to 5kN pretty well and based on this we are confident in our results between specimens regardless of final force. That being said, going forward we will be using 5kN because there is no such thing as too much data.
Each specimen file (.xlsx) has separate windows for axial, shear and transverse stresses.
Poisson's Ratio
I need to confer with Dylan and update this soon. One of the .xlsx files has a very sparse version of the calculations we did, but I'll get a more in depth notation by this weekend.I NEED TO PROVIDE MORE DETAIL HERE)