| 摘要 |
The invention relates to a material sample for testing material properties under biaxial stress and to a method therefor. The material sample has a circular disk shape and for rotation about the center line thereof is provided with an integrally formed hub. The edge of the material sample and the hub are thicker than the ring section of the material sample located in between. In one embodiment, the ring section is designed with an annular concave fillet concentric to the hub, and the concave fillet may extend from the edge to the hub and have a continuous curvature over the width thereof. In the method it is rotated about the center line thereof with at least 100,000 rpm, preferably with 150,000 rpm ± 10,000 rpm.
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