A 1-in-diameter rod, 3 ft long, of unknown material is found in a machine shop. A variety of inexpensive nondestructive tests are readily available to help determine the material, as described below:
(a) Visual inspection.
(b) Scratch test: Scratch the surface with a file; observe color of underlying material and depth of scratch.
(c) Check if it is attracted to a magnet.
(d) Measure weight (±0.05 lbf).
(e) Inexpensive bending deflection test: Clamp one end in a vise, leaving 24 in cantilevered. Apply a force of 100 lbf (±1 lbf). Measure deflection of the free end (within ±1/32 in).
(f) Brinell hardness test.
Choose which tests you would actually perform, and in what sequence, to minimize time and cost, but to determine the material with a reasonable level of confidence. The table below provides results that would be available to you if you choose to perform a given test. Explain your process, and include any calculations. You may assume the material is one listed in Table A–5. If it is carbon steel, try to determine an approximate specification from Table A–20.
Test Results if test were made
a. Reddish-brown, tarnished, smooth surface finish
b. Shiny brassy color, deep scratch
c. Not magnetic
d. W = 9.00 lbf
e. δ = 17/32 in
f. HB = 70