NCEES Civil PE Specification VII.D.: Structural Steel
Pictured below is a stress-strain curve for a carbon steel rod subject to a tension test via a universal testing machine. At what point did the tensile stress on the rod reach the steel’s yield strength?
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Answer: B) Point B
The steel yield strength is reached after the steel has reached its elastic limit (Point A) and begins to behave inelastically (Point B). Once loaded past its yield strength, the steel experiences inelastic deformation and is able to be stressed until it reaches its ultimate tensile strength (Point C). The steel is then loaded until fracture (Point D).