Select a shorter tubular column from among those provided. Measure its wall thickness and linear dimensions. Use this information to compute the second moment of area for the selected sample, and to normalize the measured force and displacement during buckling.

Adjust the Instron 8501 to accept this sample for compression
testing, and set up the correct testing conditions (strain-rate and
load limits) using the MAX program that remotely controls the
machine.

Obtain a buckling curve for the selected sample. Transfer your data to Excel so that a nominal stress/strain curve can be plotted. Identify the stages of the elastic - plastic buckling behavior shown by your sample. Compare the measured transition points with those expected from the Euler modeling of the process.