Figure shows the shape of a test specimen used to measure the tensile properties of metals...

Figure shows the shape of a test specimen used to measure the tensile properties of metals (as described in Chapter). An axial tensile force is applied through the threaded ends, and the test section is the reduced-diameter part near the middle. Compute the stress in the middle portion when the load is 12 600 lb.

Figure:

                       

                                   FIGURE Tensile Test specimen for Problem