抄録
This paper presents the results of constant load low-cycle rotating bending fatigue tests that were carried out on nodular cast iron and grey cast iron with the speed of stress repetition at 10 and 100rpm. The deflection values of specimens (vertical and horizontal deflections) were monitored and recorded during the tests. All tests were conducted at room temperature.
The results obtained are summarized as follows:
(1) The low-cycle fatigue process of the nodular cast iron and the grey cast iron can be expressed by the horizontal and vertical deflections.
(2) Under the low-cycle rotating bending tests, the relations between N and σa/σB for both the nodular cast iron and the grey cast iron can be given by almost the same straight line on the logarithmic scale coordinates. (N: number of cycles to failure, σa: stress amplitude, σB: tensile strength.)
