Hydraulic support for direct tensile test device

Abstract

The invention relates to a hydraulic support for a direct tensile test device which is composed of a group of tubular construction members which have the same central axis and are arranged in a stack mode, wherein each construction member comprises an upper end cap and a lower end cap which are respectively connected with an upper chain and a lower chain of the two end caps; an upper joint and a lower joint are respectively connected with the other end of the upper chain and the other end of the lower chain; the lower joint is fixed on a base of a tester; the support is composed of a hydraulic cylinder which is filled with liquid, and divided into a supporting barrel and a measuring barrel; and the bottoms of the two barrels are communicated by a hollow conduit. In the process of the test, the value of the buoyancy provided by the hydraulic pressure can be calculated by measuring the altitude difference of the liquid surface in the measuring barrel, and the tensile data are removed soas to reduce the system error. In the invention, the traditional spring is replaced by the hydraulic pressure, thus the measurement range of the test data is expanded, the operation is more convenient, the measurement accuracy is improved, and the test equipment can be effectively protected from being damaged when the tensile test has an accident.

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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