For properties of material lab I tested a western red cedar block in compression

Question

For properties of material lab I tested a western red cedar block in compression parallel to grain 1.42x1.41x4.77 inches, The stress strain curve peaked at 8712.9 lbs, stress 4351.68 psi, Strain of .0253. The sample had 7 rings on the top surface (1.42x1.41 inches). I performed a line of best fit on the linear portion of the elastic region of the curve with a R^2=.999 and got E=346,674 psi. I researched typical Young Modulus of western Red Cedar and the smallest I found was 1.11*10^(6)psi.

What within my sample could’ve caused such a flawed result

Explanation / Answer

As per the test results and the specifications, there is a huge gap is observed. This may be due to the calibration error of the machinery or the wood taken may be different from the other. Generally, if the material is tested then it falls within the mentioned range of the specifications.

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