If a weld is subjected to axial stress f a and shear stress q, then equivalent stress f c to be considered is
- A√(fa² + q²)
- B√(fa² + 2q²)
- C√(2fa² + q²)
- D√(fa² + 3q²)Correct
Solution
Concept
Equivalent stress in a weld
Formula
fe = √(fa² + 3q²)
Step-by-step solution
1. Combined axial and shear stress in a weld: fe = √(fa² + 3q²) (von Mises form).
Explanation
IS 800 uses the von Mises equivalent for a weld under combined axial and shear stress.
Why the other options are wrong
The other expressions have incorrect coefficients.
Shortcut
√(f² + 3q²).
Common mistake
Using √(f² + q²).
Correct answer: D) √(fa² + 3q²)