Test device applicable to ultralow temperature reinforcing steel bar tensile test

Abstract

The invention discloses a test device applicable to ultralow temperature reinforcing steel bar tensile test. The test device comprises a low temperature test box (1), a reinforcing steel bar test sample (2) and a clamp, wherein the clamp comprises an upper threaded clamp (3) and a lower threaded clamp (4), and the upper threaded clamp (3) and the lower threaded clamp (4) are respectively connected to one end of the reinforcing steel bar test sample (2) and fixed on the low temperature test box (1); one end, matched with the reinforcing steel bar test sample (2), of each of the upper threaded clamp (3) and the lower threaded clamp (4) is of a hollow bushing structure. According to the test device, the yield and the extreme strength of an upsetting part of the reinforcing steel bar test sample can be improved through the cold upsetting process, so that the real strength of a connector can be higher than the strength of a reinforcing steel bar test sample base material; meanwhile, the reinforcing steel bar test sample is clamped by the upper threaded clamp and the lower threaded clamp in a threading manner; moreover, as the test force is increased, the clamping force is also increased, so that the authenticity and reliability of data of the low temperature tensile test of the measured reinforcing steel bar test sample can be guaranteed.

Description

technical field [0001] The invention relates to the field of low-temperature tensile tests of metal materials, in particular to a test device suitable for ultra-low temperature steel bar tensile tests at -165°C. Background technique [0002] -165°C low-temperature steel bars are widely used in the construction of liquefied natural gas storage tanks. The supplier needs to provide the -165°C low-temperature tensile test results, and the samples are not allowed to be turned, so as to ensure that the measured tensile properties are consistent with the base metal. unanimous. At present, the steel bar tensile test is generally required to be carried out at room temperature. The design and installation of the normal temperature fixture are relatively simple, but the low temperature stretching needs to be carried out in the low temperature test chamber. Small size, large clamping force, and low temperature resistance, so it is difficult to design and install low temperature fixture...

AI Technical Summary

Problems solved by technology

At present, the steel bar tensile test is generally required to be carried out at room temperature. The design and installation of the normal temperature fixture are relatively simple, but the low temperature stretching needs to be carried out in the low temperature test chamber. Small size, large clamping force, and low temperature resistance, so it is difficult to design and install low temperature fixtures

In the prior art, the minimum temperature applicable to the low-temperature fixture of the steel bar sample is -80°C, and the steel bar sample needs to be turned into a standard sample with shoulders, as shown in the attached manual. figure 1 The structure shown in this way, the tensile results obtained in this way cannot truly reflect the overall mechanical properties of the steel bar base material at low temperature

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