RESONANT AND ELECTROMAGNETIC FORCE GENERATOR FOR TEST MACHINES TESTING THE FATIGUE AND FATIGUE-INDUCED CRACKING OF MATERIALS

摘要

The device comprises several weights (8) vibrating in rotation. These weights (8) are guided on the one hand and on the other hand driven in this rotational movement by elastic blades (6, 7) which connect the one hand to the frame (a) of the machine and on the other part in the vibrating member (3) in translation, which transmits its movement to the movable end of the specimen under test. The paddles (8) and elastic strips (6, 7) are arranged such that said movable end of the specimen (1) is properly guided in its translational movement, the elastic and inertial system thus formed is dynamically balanced, and the mass of this system is much less than that of a mass (8) only directly connected to the movable end of the specimen (1) and vibrating in translation, for comparable operating conditions.