A thin sheet is to have a width of 8.25 in and a central hole of 0.75-in diameter. The design calls for an allowable nominal stress σ = 18 ksi with a safety factor of 1.2 on the allowable nominal...

A thin sheet is to have a width of 8.25 in and a central hole of 0.75-in diameter. The design calls for an allowable nominal stress
σ
= 18 ksi with a safety factor of 1.2 on the allowable nominal stress. There is a choice of using aluminum alloys 2014-T6, 6061-T6, or 7075-T6. If the cost of the material is proportional to yield stress (see Appendix B), determine the most cost-effective alloy that could be used.