Correct Answer - Option 2 : 50 MPa
Concept:
Stress developed at irregular section = Normal average stress × Stress concentration factor
Stress developed at irregular section ≤ maximum permissible stress
Calculation:
Given:
Stress concentration factor = 3 , maximum permissible stress = 150 MPa
Stress developed at irregular section ≤ maximum permissible stress
∴ Normal average stress × stress concentration factor ≤ 150
Normal average stress × 3 = 150
∴ Normal average stress = 50 MPa