抄録
In the extremely low cycle fatigue, a transition of the fracture mode occurs from the surface to internal fracture with an increase in the plastic strain range. Such a transition is caused by an increase in the paerlite cracking inside the material. The pearlite cracking is affected by the stress distribution, and is greatly dependent on the own direction of lamellae. However, Work Hardening seldom affects an increase in the paearlite cracking.
