Hydraulic supporting body for direct tensile test device

Abstract

The invention relates to a hydraulic supporting body for a direct tensile test device. A tensile device is formed by stacking cylindrical members which have a common central axis and comprises upper and lower end caps for fixing a sample, upper and lower chains connected with the two end caps respectively and upper and lower connectors connected with the other ends of the upper and lower chains respectively, wherein the lower connector is fixed on the base of a test machine. The supporting body consists of a set of hydraulic cylinder containing liquid and is divided into a supporting cylinderand a measuring cylinder, wherein the bottom parts of the two cylinders are communicated by a hollow conduit. In a test process, according to the difference between heights of the variable liquid level in the measuring cylinder, the value of the buoyancy provided by a hydraulic pressure can be calculated and removed from tensile data, and the system errors are reduced. And in the invention, the hydraulic pressure is used in place of the conventional spring, the measurement range of test data is enlarged, the operation is more convenient, the measurement accuracy is improved, and the test device is protected from being damaged in time when an accident happens in the tensile test.

Description

technical field [0001] The invention relates to a direct tension test device for brittle materials, in particular to a supporting body of the test device. Background technique [0002] Nowadays, direct tensile test devices are widely used in the determination of tensile mechanical properties of brittle materials such as rocks. Obviously, the test device has a great influence on the accuracy of the measurement data, and the sample support is considered to be very critical in the test device. part. Due to its special compression and tensile properties, brittle materials put forward higher requirements on the test equipment, especially the sample support. In the traditional test device, the rigid sleeve is generally used as the support body, but the rigid sleeve has a defect. When the force on the sample reaches the peak value, under the action of gravity on the sample below the failure surface, the lower end cap and the lower chain , the sample breaks suddenly, the test is t...

AI Technical Summary

Problems solved by technology

Therefore, this elastic support seriously affects the accuracy of the test data

In addition, this kind of spring support will also bring some new problems as follows: 1) The sample is damaged at the end

It can be seen from the figure that the lower joint, the lower pin and the chain are all wrapped by the spring, and the inner space of the spring is narrow, and the distance between the two rings is also very small, which brings a lot of inconvenience to the installation of the lower component; 4) the spring is in the In long-term use, deformation and aging will occur, which will affect its normal performance

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