| 摘要 |
It is an object to provide a fatigue testing apparatus that effectively finds out the fatigue strength of a test material. A vibrator means 1 continuously repeatedly imparting bending deformation to a test piece 2 fixed like a cantilever; an acceleration sensor 5 attached to the test piece 2; and a strain acquiring means 12 directly measuring or calculating strain of a fatigue-strength evaluation site of the test piece 2 are provided, wherein the vibrator means 1 follows a change of a natural frequency of the test piece 2 and imparts the followed natural frequency to the test piece 2, and a stress amplitude at the fatigue-strength evaluation site is calculated by using the strain acquired by the strain acquiring means 12 and response acceleration obtained from the acceleration sensor 5. |
