Test-piece torsion test system

A test system and test piece technology, applied in the direction of applying stable torsion to test the strength of materials, measuring devices, instruments, etc., can solve the problems of inability to perform repeated torque loading, cracks, end force and deformation complex, etc. Achieve the effect of easy composite force test

Inactive Publication Date: 2009-12-16
TONGJI UNIV
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Problems solved by technology

This type of test device has the following disadvantages: (1) As the test progresses, the fixed end rotates, cracks appear, and the stiffness decreases, resulting in unclear torsional constraints. In severe cases, the end may be damaged before the middle of the specimen, resulting in test failure
(2) The force and defor

Method used

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0039] The present invention makes two improvements to the test loading system. One is to cancel the fixed end, and both ends of the test piece are loaded by jacks. The problems of stability and inability to rotate freely are solved by setting arc supports. In this way, the damage phenomenon of fixed end nodes that may occur due to asymmetric loading at both ends in some current tests will not appear. Due to the symmetrical application of torque at both ends, it can truly simulate the free torsion of components in actual engineering, the force is clear, and it is easy to analyze. The second is to make a jack loading conversion device, which can realize repeated torque.

[0040] The loading system consists of three parts: vertical support, specimen and its fixing device, jack and its conversion device. For the case of monotonic torque, there i...

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Abstract

A test-piece torsion test system comprises a test loading system and a data acquiring and processing system; wherein the test loading system comprises a supporting device and a loading device. A test piece is supported above the supporting device, and the loading device is arranged at the two ends of the test piece to carry out pressor test on the test piece. The supporting device comprises a pedestal and a curved support; wherein the curved support is fixed on the pedestal to support a test piece and comprises two fit parts of an upper part and a lower part, corresponding position of the upper part and the lower part is opened with a shallow slot to place balls, so as to realize zero friction free rotation of the test piece support. The loading device is arranged at the two ends of the test piece, and the two sides of the loading device are respectively provided with a jack and a jack crest beam used as a reaction force end. Diagonal loading of the jacks at the two ends of the test piece of the invention can realize monotonic torsion. If the four jacks are combined, two diagonal jacks are in a group, the two groups complete loading-unloading-loading alternately, and the process is repeated, so that reverse torsion can be realized and defect that a fixed end node is firstly destroyed as the fixed end is provided is avoided.

Description

technical field [0001] The invention belongs to the field of test devices, and relates to a system for teaching, demonstration and scientific research of torsion tests of concrete, steel, wood and composite components thereof. Background technique [0002] The test system used for teaching and research generally includes at least two parts, namely (1) test loading system; (2) data acquisition and processing system. In addition, demonstration systems and corresponding test protocols may also be included. Different from the plane force of the specimen under compression / tension / bending / shearing, the torsion of the specimen belongs to the force of space, which greatly increases the difficulty of developing test devices and conducting tests. Existing devices generally fix one end of the specimen in a larger concrete slab, and apply torque to the other end, such as Figure 14 shown. This type of test device has the following disadvantages: (1) As the test progresses, the fixed e...

Claims

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Application Information

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IPC IPC(8): G01N3/22G01N3/02G09B23/10G01B21/22
Inventor 林峰顾祥林崔玮
Owner TONGJI UNIV
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