Hydraulic support body of direct tension test apparatus
A tensile test and hydraulic support technology, applied in measuring devices, using stable tension/pressure to test material strength, instruments, etc., can solve the problems affecting the accuracy of test data, affecting performance, end damage, etc., to reduce labor costs. Labor intensity, expanding the measurement range, and realizing the effect of automation
Inactive Publication Date: 2009-08-12
LANZHOU UNIVERSITY
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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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[0036] In the tensile test, use the upper end cap 3 and the lower end cap 6 to fix the sample 5 and tighten it, adjust the liquid level in the hydraulic cylinder (which can be realized by injecting or extracting liquid from the measuring cylinder 16), so that the support pad 14 and the lower end cap 6 contact, and use a weight plate 13 with a higher material density than the support pad 14, or superimpose other weights on the weight plate 13, so that the buoyancy in the hydraulic cylinder is balanced, and the liquid level in the support cylinder 18 and the measurement cylinder 16 are the same. Otherwise, the initial liquid level of the two cylinders is different, which will affect the subsequent test. Above the weighing plate 13, hang the heavy object 15 with a soft rope, so that the heavy object 15 contacts the weighing plate 13, but the weighing plate 13 does not bear the weight of the heavy object 15.
[0037] After installing the device, before the test starts, record the ...
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The invention relates to a hydraulic supporting body of a direct stretching tester, wherein a stretching device is formed by laminating a set of cylindrical members with the same central axis; the stretching device comprises an upper end cap and a lower end cap for fixing a test sample, an upper chain and a lower chain connected with the upper end cap and the lower end cap respectively and an upper joint and a lower joint connected with the other end of the upper chain and the other end of the lower chain respectively; the lower joint is fixed on a pedestal of the tester; the supporting body consists of a hydraulic cylinder filled with liquid and is divided into a supporting cylinder and a measuring cylinder; and the bases of the cylinders are communicated by a hollow conduit. In the testing process, through the measurement of height difference of the liquid level change of the measuring cylinder, the hydraulic supporting body can calculate the value of hydraulic pressure providing floatage, remove the value from stretching data and reduce system error. The hydraulic supporting body uses hydraulic pressure to replace a conventional spring of the system, enlarges the measuring range of testing data, has more convenient operation, improves the measuring precision and can also effectively prevent the stretching test having accident and protect the tester from being damaged in time.
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...
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IPC IPC(8): G01N3/02G01N3/10
Inventor 赵忠虎谌文武
Owner LANZHOU UNIVERSITY