| 摘要 |
<p>The invention relates to a testing device comprising, in axial alignment - a generator (5) capable of creating at least one torsional force, - a bar (7) transmitting this force from the generator to the specimen (1) coupled to the end of the bar, - a locking device (8) capable of rapidly locking and releasing the said bar, this device being applied to the bar (7) at a point located between the specimen (1) and the generator (5). According to the invention, there is provided, between the said bar (7) and the specimen (1), a member (9) for favoured transmission of traverse waves, this member comprising - a cylindrical core (11) made from a metal of moderate elastic modulus, and equipped with flanges (13, 16) at the two ends, - a plurality of fibres (12), which helically surround the core (11), are parallel to each other and which are fixed to the two flanges (13, 16) in a stretched manner and which have an elastic modulus substantially higher than the core (11). <IMAGE></p> |
