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Mechanical Engineering QUESTION #2513
Question 1
The Soderberg criterion for fatigue is more conservative than the modified Goodman criterion because it uses which strength in place of \(S_{ut}\)?
  • Endurance limit \(S_e\)
  • Proof strength \(S_p\)
  • Yield strength \(S_y\)✔️
  • Fracture strength \(S_f\)
Correct Answer Explanation
The Soderberg criterion: \(\frac{\sigma_a}{S_e}+\frac{\sigma_m}{S_y}=\frac{1}{n}\). It substitutes yield strength \(S_y\) for ultimate strength \(S_{ut}\). Since \(S_y < S_{ut}\), the Soderberg line falls inside the Goodman line, making it more conservative.