Steel strand mechanical testing device in ultra-low-temperature environment and testing method thereof

Abstract

The invention discloses a steel strand mechanical testing device in an ultra-low-temperature environment and a testing method thereof. The device comprises a universal testing machine and a low-temperature box arranged between an upper jaw and a lower jaw of the universal testing machine; through holes which are opposite to each other and are used for the passing of a connecting component connected with a tested steel strand are respectively formed in the upper surface and the lower surface of the low-temperature box; the connecting component is connected with the two ends of the tested steel strand and consists of a force transfer rod, a connection self-locking component and a self-locking clamp head. According to the steel strand mechanical testing device in the ultra-low-temperature environment and the testing method thereof, the aim of completely arranging the tested steel strand in the low-temperature box is fulfilled by utilizing the connecting component for the tested steel strand; the temperature of the steel strand is distributed uniformly; mechanical parameters can be tested accurately; the test accuracy is improved, wherein the connecting component comprises the connection self-locking component, the self-locking clamp head and the force transfer rod, so that the overall device is simple in structure, easy to machine and convenient to detach and can be reused; moreover, the testing method is simple and is convenient to operate; the test accuracy is improved, and the test efficiency is guaranteed, and therefore, the device and the method can be widely applied to steel strand mechanical tests.

Description

technical field [0001] The invention relates to a steel strand mechanical test device and a test method thereof. Background technique [0002] In low temperature civil engineering, prestressing technology has been applied in concrete structures. Among them, steel strand, as the most important component in prestressing technology, changes in mechanical properties under low temperature environment, which has a crucial influence on the whole prestressing system. Therefore, it is necessary to study the mechanical properties of the steel strands used in low temperature and ultra-low temperature environments. [0003] At present, scholars at home and abroad have proposed three feasible schemes to study the mechanical properties of steel bars in low-temperature or ultra-low temperature environments: 1. Put the steel bars under test to cool down in a low-temperature environment, and then perform mechanical tests with a universal testing machine at room temperature; 2. 1. Fix the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a steel strand mechanical test device and its test method in an ultra-low temperature environment, to so...

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