| 摘要 |
The present patent describes a machine for performing biaxial tests which includes a self-centering mechanism for ensuring that the loads applied to the test tube are orthogonally maintained at any moment. Said machine is formed by two orthogonal loading axis actuated independently from each other. The design ensures that the loads applied in the end portions of the axis of a test tube are identical, where in ideal conditions the displacements of the test tube centroid are eliminated, and in practical conditions are reduced. A self-centering system is integrated, which function is to maintain the orthogonality of the loads in the test tube centroid by repositioning the load axis, without the intervention of an active control system. Said mechanism comprises a floating frame mounted over a guide-slider arrangement, which provides flat motion freedom to a load axis mounted over the same frame. The aforementioned characteristic provides to said axis the ability of being instantaneously r epositioned in any direction in a plane, as a result of any orthogonality loss using the complementary load axis.
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