An application requires the support of an axial load of 100 kips with a round rod without exceeding the yield strength of the material. Assume the current cost per pound for round stock is given in the table below for several materials that are being considered. Material properties are available in Tables A–5, A–20, A–21, and A–24. Select one of the materials for each of the following additional design goals.
(a) Minimize diameter.
(b) Minimize weight.
(c) Minimize cost.
(d) Minimize axial deflection.
Materials Material Cost/lbf
1020 HR ........... $0.27
1020 CD ........... $0.30
1040 Q&T @800°F ...... $0.35
4140 Q&T @800°F ...... $0.80
Wrought Al 2024 T3 ....... $1.10
Titanium alloy (Ti-6Al-4V) ... $7.00