Development of multi-type fatigue machine in axial loading and experimental confirmation of its fundamental performance

摘要

Multi-type fatigue testing machine in axial loading was developed by using a special hydraulic system with a rotary valve. Fatigue tests for four different specimens can be performed simultaneously by using this testing machine. The loading capacity for each specimen is + - 10 kN and the frequency is 80Hz, respectively. Thus, one can perform the fatigue tests in the long life regime for many specimens within a definite period even in the usual frequency where the temperature raising does not take place on the specimens. The fundamental structure and its performance is presented here together with the fundamental experimental results on a bearing steel of SUJ2.