Shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device

Abstract

The invention discloses a shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device. The shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device comprises an MTS tester, an MTS controller, an optical measurement strain measuring device, a first temperature controller, a temperature sensor and a direct-current heating power supply, wherein the MTS controller is connected with the MTS tester; the optical measurement strain measuring device is connected with the MTS controller; the temperature controller is used for measuring the temperature of an MTS tester test sample; the first temperature controller is connected with the MTS controller; a positive electrode and a negative electrode of the direct-current heating power supply are connected with the two ends of the MTS tester test sample; a first relay is arranged between the direct-current heating power supply and the MTS tester test sample; the first relay is connected with the first temperature controller; a cooling module is further provided; the cooling module is connected with the first temperature controller; the first temperature controller is connected with the temperature sensor and the control device simultaneously; the MTS controller is connected with the control device. By adopting the shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device, the integrity of the test sample is effectively ensured, and required data can be acquired synchronously.

Description

technical field [0001] The invention relates to the field of performance testing of shape memory alloys, in particular to a heat-mechanical coupled multi-axis cyclic deformation experiment device for shape memory alloys. Background technique [0002] With the advancement of science, high-tech fields such as aerospace, bioengineering, and microelectronics are developing rapidly; people's requirements for material performance are also getting higher and higher, and traditional structural materials can no longer meet the needs of scientific development; so many have Materials with special functions emerged at the historic moment. Shape memory alloys are widely used in industries such as machinery, medical treatment, aviation and automobiles because of their good biocompatibility, light weight and wear resistance, and unique shape memory properties; among them, the shape memory effect is The main deformation characteristic of this alloy is widely used, that is, a thermoelastomer...

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Problems solved by technology

[0003] Since the fatigue test takes a long time and the martensitic transformation occurs instantaneously, the existing experimental methods, such as the traditional environmental chamber heating method, use the temperature change in the chamber for heat conduction and heat radiation heating, which will lead to heating The uneven temperature inside and outside the sample leads to uneven phase transformation and affects the experimental results; the sealing characteristics of the environmental chamber hinder the in-situ observation of the martensitic transformation zone, and due to the limitation of the environmental chamber, the heating and cooling methods are very difficult Slow, the cycle is too long for the fatigue test, and the fatigue failure behavior research of the shape memory alloy cannot be carried out; in the process of the shape memory test, the temperature signal needs to be obtained, and there is a problem of asynchronous data acquisition time; at the same time, for the shape memory alloy In thermal-mechanical coupled fatigue tests of alloys, due to the need for different temperature-time loading conditions, traditional heating devices cannot obtain the strain field evolution on the surface of the sample, and cannot capture the evolution of the phase transition zone

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