Aircraft structure test piece bending preventing and measuring device and measuring method thereof

Abstract

The invention relates to an aircraft structure test piece bending preventing and measuring device which comprises multiple bending preventing and measuring mechanisms. A test piece is clamped through the multiple bending preventing and measuring mechanisms. Each bending preventing and measuring mechanism comprises a spherical roller, a pulley support, a first lead screw, a second lead screw and a sensor, wherein the spherical roller is arranged in the spherical surface of the pulley support and presses the surface of the test piece to be in contact with the test part, the pulley support is connected with one end of the sensor through the first lead screw, and the other end of the sensor is fixed to a bearing wall through the second lead screw. The aircraft structure test piece bending preventing and measuring device achieves the purposes of effectively preventing bending and conducting quantitative control on bending prevention by arranging the spherical rollers and arranging the load sensors at the connecting positions of the spherical rollers.

Description

technical field [0001] The invention belongs to the field of aviation fatigue damage test, and in particular relates to an aircraft structure test piece anti-bending and measuring device and a measuring method thereof. Background technique [0002] In the fatigue test of aircraft structure, it is often encountered that the external load does not coincide with the centroid of the section of the test piece, and the test piece needs to be restrained against bending. The most common anti-bending measure is to install cylindrical rollers on the contact surface of the test piece to ensure that the test piece does not bend out of plane and will not cause load loss, such as figure 1 and figure 2 As shown, the current anti-bending device is composed of a cylindrical roller 1', a cylindrical roller bracket 2' and a screw 3', etc., wherein the two ends of the screw 3' are respectively connected with the cylindrical roller bracket 2' and the bearing wall 5', and the cylindrical roller...

AI Technical Summary

Problems solved by technology

However, during the fatigue test, due to the large load at the anti-bending restraint point and the long test period, the bolts connecting the cylindrical roller 1' often loosened, resulting in inconsistent tightness of each cylindrical roller. Since the side of the cylindrical roller 1' is flat and Acting on the test piece 6 will make the clamping force of the cylindrical roller 1' on the test piece 6 different, so the use of this anti-bending device cannot effectively support and quantitatively control the roller

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