In the 7th edition of Mechanics of Materials by Beer, Johnston, DeWolf, and Mazurek, Chapter 11 focuses on Energy Methods
Defined as the energy stored within a material or structure due to deformation caused by applied loads. Linear Elastic Materials:
This matches the precision and flow of the official solution manual.
Engineers who master Chapter 11 can specify, “Use a W12x65 steel beam with a yield stress of 50 ksi, checked for both flexure and shear at the support.”
A simply supported beam spans 12 ft, carries a uniformly distributed load of 5 kip/ft. Material has ( \sigma_allow = 24 ) ksi. Select the lightest W-section. Ignore beam weight.