Plane Bending Plastic Fatigue of Ni-Cr-Mo Steel

抄録

The plane bending plastic fatigue testing machine was developed for a further systematic study of the fatigue problem in the plastic range. A constrained strain test and a constrained stress test were carried out on the Ni-Cr-Mo steel. From the discussion of the results, it was concluded that the test under constant strain amplitude is the most basic one in the sense that it gives a fairly stable hysteresis loop throughout the test, and the data of the other tests under various conditions such as varying strain amplitude and constrained stress amplitude should be discussed in comparison with those of the test under constant strain amplitude. The treatment using the parameter ε_total, which is the total strain summed up from the beginning to the occurrence of a fracture regardless of the sign, seems to offer a method for further analysis.