A kind of testing device and testing method for shear creep performance of brazed joint

Abstract

The invention discloses a testing device and method for shear creep performance of a brazed joint, and belongs to the technical field of mechanical property testing. The testing device comprises a support mechanism, a heating mechanism, a loading mechanism, a control mechanism and a data acquisition mechanism. A brazing fixture is of a symmetrical structure, and samples are placed on the left andright sides, thereby not only ensuring the stability of loading, but also realizing the synchronous observation process of the shear test of the brazed joint. The changes of the two samples can be compared, thereby facilitating elimination of the interference of external factors under the same load. On the other hand, different loads can be applied to the left and right samples on the brazing fixture, so that the fracture process of brazing joint under different loads can be observed in a computer, and the influence of load on the creep shear fracture process can be better compared and analyzed. The testing device and method disclosed by the the invention have high testing accuracy, and are convenient to operate. The high-temperature creep process of the samples can be observed in real time.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance testing, and in particular relates to a testing device and a testing method for the shear creep performance of brazed joints. Background technique [0002] As an important method of material connection, brazing has been widely used in aerospace, nuclear energy, electronic technology and other industries. It has the advantages of small brazing deformation and beautiful joint shape. However, brazed structures are often served in high-temperature environments, and brazed joints will be subjected to various loads such as temperature load, pressure, fatigue and internal residual stress. Shearing is a typical working condition mainly suffered by brazed joints. Creep failure is a typical failure mode of brazed joints, therefore, it is of great significance to measure the creep performance of brazed joints under shear load. [0003] At present, relevant national standards have been issued ...

AI Technical Summary

Problems solved by technology

China University of Petroleum (East China) invented an experimental method for the mechanical properties of brazed joints (notice number: CN103808567B). This method uses scanning electron microscopy to observe the microscopic behavior of materials during stretching. The device is complex and expensive

Shanghai Institute of Applied Technology announced a shear performance test device for cemented carbide brazed joints (application number: 201410781284.2), which can easily complete the shear performance test experiment of brazed joints made of different materials on the existing universal testing machine , but this device is not suitable for high temperature environment

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