A component made of SAE 1005 steel has a plate with a center hole of 4.0 mm. The plate has a width of 16mm and thickness of 5 mm. An elastic stress concentration factor of 2.4 was calculated for the notch based on its geometry when subjected to tensile loading. Fatigue tests were conducted on unnotched plates of the same material to generate a baseline S-N curve.

1. A hot-rolled notched component made of SAE 1005 (Su ¼ 321MPa)
consists of a plate with a center hole of 4.0 mm. As shown
in Figure, the plate has a width of 16mm and a thickness of 5 mm.
The elastic stress concentration factor Kt of 2.4 due to tension was
calculated based on the geometric ratio. Fatigue tests with cyclic axial
loading on the hot-rolled unnotched plates of the same material were
conducted to generate a baseline S–N curve that has the following