| 摘要 |
<p>The invention relates to a fatigue test machine having a test piece (10), said machine comprising a movable punch applying a cyclical axial load to a surface of the test piece (14), which is perpendicular to the axis of the punch, wherein said test piece bears against a stationary base via a surface (12) opposite to the first surface, characterized in that the test machine comprises two annular bearing surfaces of different radiuses, which are centered on each of the opposite surfaces (12, 14) of the test piece (10), wherein the center portion of said test piece includes a biaxial stress area (22) comprising two parallel surfaces, and the surface (12) comprising the annular bearing surface of largest radius (A) accommodates strain gauges (20) on the biaxial stress area (22).</p> |
