Topic: Mechanics of Materials
Which of the following is true for ductile materials?
- A. Engineering stress-strain curve cannot have negative slope
- B. Most applicable failure theory is maximum principal stress theory
- C. Ultimate strain is the strain at ultimate stress
- D. Strain hardening is represented by a negative slope in engineering stress strain curve
Answer: C. Ultimate strain is the strain at ultimate stress
Explanation: The ultimate strain corresponds to the point of ultimate tensile stress (UTS) on the stress-strain curve. Statements (a), (b), and (d) are incorrect.