(True/False) Fatigue prone details include the type of detail, weld quality and quality of fabricated detail.

• A. True
• B. False
• C. Not sure
• D. Both

Answer: (A)

Fatigue-prone details are features in a structure that tend to concentrate stress under repeated loading, making fatigue cracks more likely to start and grow. The form of the detail matters because sharp corners, abrupt geometry changes, or connections that create high bending or stress concentrations increase the cyclic stress at a location. Weld quality matters because defects in welds—porosity, lack of fusion, undercut, cracks—provide easy crack initiation sites and can accelerate crack growth under cycles. Fabrication quality matters as well, since poor fit-up, misalignment, rough surfaces, residual stresses from welding, and inadequate inspection or protection against corrosion all influence how and where cracks begin and propagate. Since all of these aspects affect fatigue life, the statement is true.