A uniaxial tensile measuring device

Abstract

The invention discloses a uniaxial tensile measurement device, which comprises a tensile test piece and a tensile measurement assembly; the tensile test piece includes a concrete test piece and upper and lower end tensile auxiliary mechanisms, and the concrete test piece includes a middle tensile section And the upper and lower auxiliary installation parts; the upper tensile auxiliary mechanism includes the upper front side plate, the upper rear side plate, the upper left connecting shaft, the upper right connecting shaft, the upper left contact bearing, the upper right contact bearing, and the upper rectangular Frame body, movable pull arm at the upper end; the auxiliary stretching mechanism at the lower end includes the lower front side plate, the lower rear side plate, the lower left connecting shaft, the lower right connecting shaft, the lower left contact bearing, the lower right contact bearing, the lower rectangular The frame body and the lower movable pull arm; the tensile measurement component includes the upper scissors mechanism, the lower scissors mechanism and the left and right displacement sensors. The invention has a novel structural design, and can ensure the uniaxial stress state of the concrete specimen during the tensile test process, and can also ensure the safety of the displacement sensor.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a uniaxial tensile measuring device. Background technique [0002] The concrete and mortar uniaxial tensile device is an important test equipment in scientific research and an important method to determine the uniaxial tensile strength of materials. The traditional "character-eight" specimen tensioning device has high requirements on the accuracy of the specimen's own support, and the low precision of the specimen can easily cause the specimen to bear the bending moment during the uniaxial tension process, and the test results no longer reflect the actual material sheet. axial tensile strength. For high-toughness cement-based, the method of directly holding the tension machine is usually used, and the force transmission plate is pasted at both ends of the specimen to disperse the holding force, which is greatly affected by the stability of the fixture during the operat...

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Problems solved by technology

[0004] 1. The traditional "figure eight" uniaxial tensile test is affected by the accuracy of the test piece, and the deformation of the test piece on the stressed side can easily cause the off-axis bending moment;

[0005] 2. The traditional "figure eight" uniaxial tensile test is affected by the stability of the machine fixture during the loading process, and the slight offset of the fixture can cause the specimen to be destroyed in advance;

[0006] 3. The direct tensile material test of the pasted force transmission plate has high requirements for pasting. During the test, debonding causes changes in the stress state of the specimen. Among them, the off-axis bending moment caused by asymmetric debonding affects the test accuracy;

[0007] 4. The direct tensile material test of the pasted force transmission plate has high requirements on the stability of the fixture operation, and the offset of the fixture during the loading process causes the specimen to be destroyed in advance;

[0008] 5. In the traditional uniaxial tensile strain region measurement method, the sensor is fixed on the test piece. During the destruction process of the test piece, the displacement increases suddenly, which will easily cause the sensor to work beyond the range and reduce the life of the sensor.

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