Material for test specimen: Polycarbonate strip

Dimensions before test:

Length $75$ mm$,$ Width $10$ mm$,$ Thickness $4$ mm$.$

Dimensions after test:

Length $126\mathrm{.}6$ mm$,$ Width: $8\mathrm{.}3$ mm$,$ Thickness: $3\mathrm{.}2$ mm

$($see attached force vs extension graph and data table$)$

a$)$ Use the graph to locate the elastic region.

b$)$ c$)$ Calculate the stress vs$.$ strain for the strip. Use the values to plot a different graph showing the stress vs$.$ strain for the elastic region. Fit a straight line to the stress vs$.$ strain curve and use the line to calculate Young's modulus E for the strip.

c$)$ Determine the mean, mode, and median averages.

d$)$ e$)$ Use the force$-$extension graph to calculate the yield stress and ultimate tensile strength.