A tensile testing machine is used to determine the behavior of materials as they are deformed. In a typical test, a specimen is stretched at a steady rate. The force (load) required to deform the material is measured, as is the resulting deformation. An example of the data measured in one test is shown in table 3-1. These data can be used to calculate the applied stress and resulting strain with the following equations

= (l - l₀)/l₀

= F/A

where

= stress in lb_f/in.² (psi)

F = applied force in lb_f

A = cross-sectional area in in.²

= strain in in./in.

l = sample length

l₀ = original sample length

The test specimen has a diameter of .505 inch

Create an x-y plot in MATLAB with strain on the x-axis and stress on the y-axis. Connect the data points with a solid black line, and use circles to mark each data point. Add a title block and axis labels.

Table 3-1

Load, lb_f length, inches

0 2

1650 2.002

3400 2.004

5200 2.006

6850 2.008

7750 2.010

8650 2.020

9300 2.040

10100 2.080

10400 2.120