A hook (Figure 7-32) for hoisting containers of ore in a mine is to be designed using a nonferrous (not based on iron) material. (A nonferrous material is used because iron and steel could cause a spark that would ignite explosive gases in the mine.) The hook must support a load of 25,000 pounds, and a factor of safety of 2 should be used. We have determined that the cross-section labeled “?” is the most critical area; the rest of the device is already well overdesigned. Determine the design requirements for this device and, based on the mechanical property data given in Chapters 14 and 15 and the metal/ alloy prices obtained from such sources as your local newspapers, the internet website of London Metal Exchange or The Wall Street Journal, design the hook and select an economical material for the hook.

Transcribed Image Text:

Figure 7-32 Schematic of a hook (for Problem 7-64).