. Cover letter.
2. Calculate the experimental Shear Strain at each position (hint L). Show one sample
calculation for each specimen.
**Remember ( is in radians!
3. Calculate the experimental Shear Stress at each position. Show one sample
calculation for each specimen.
4. For each specimen tested, prepare a one table listing: Material, Specimen Length,
Position Length, Specimen Diameter, Applied Torque, Measured Angle of Twist,
experimental Shear Stress, and experimental Shear Strain.
5. For each specimen tested, plot (using a computer) the experimental Shear Stress (t)
(y-axis) vs. Shear Strain (y) (-axis). Clearly indicate the shear modulus, G, on your
graphs. (Note: Plot positions one and two on the same graph, using points, use the
trendline function to determine the shear modulus. This should yield ONE trendline
for ALL data points.)
6. Choose one (1) torque (i.e. 150 in-1b) and plot the average angle of twist (y-axis)
as function of the length (varying L, x-axis) for each specimen. Specify what torque
you choose. (Graph all three specimens on same graph.)
7. Conclusion. Compare the experimental shear modulus to the theoretical shear
modulus. State percent difference/error (round to 2 decimal places) and explain the
discrepancy, if any (i.e. sources of error, etc…).