Direct tensile testing device with hydraulic support

Abstract

The invention relates to a direct tensile testing device with hydroseal. A tension device consists of a group of columnar components having the same central axis and stacked together. The hydraulic support comprises an upper end cap and a lower end cap for fixing a sample, an upper chain and a lower chain respectively connected with the upper end cap and the lower end cap, an upper joint and a lower joint respectively connected with the other end of the upper chain and the other end of the lower chain, and a testing machine base on which the lower joint is fixed, wherein a sample support consists of a hydraulic cylinder filled with liquid and comprising a support cylinder and a measurement cylinder; and the bottoms of the two cylinders are communicated with each other through a hollow duct. During the test, the magnitude of the floating force provided by the hydraulic pressure can be measured by measuring the height difference of the levels in the cylinder, and then the magnitude of the floating force is removed from the tension data to reduce the systematic error. In the invention, the hydraulic pressure is used as the substitute of the conventional spring to enlarge the test data measurement range and improve the measurement accuracy, and the operation is more convenient; and the hydraulic support can effectively prevent damage to the testing device in time when an accident occurs during the tensile test.

Description

technical field [0001] The invention relates to a direct tensile test device for brittle materials, in particular to a direct tensile test device with a hydraulic support body. 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 s...

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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