Two-pass shape memory alloy thermal-mechanical functional fatigue test device

Abstract

The invention relates to the field of memory alloy test devices and discloses a two-pass shape memory alloy thermal-mechanical functional fatigue test device. The two-pass shape memory alloy thermal-mechanical functional fatigue test device comprises a data acquisition and control system, a mechanical loading component, a clamping component and a power supply control system; the mechanical loadingcomponent comprises a lead screw sliding table and a stepping motor used for driving a lead screw; the clamping component comprises a first clamping block and a second clamping block, and the first clamping block is connected with the lead screw; the data acquisition and control system comprises a single chip microcomputer, a tension sensor, a temperature sensor, a displacement sensor and a resistivity test module, wherein the tension sensor, the temperature sensor, the displacement sensor and the resistivity test module are electrically connected with the single chip microcomputer; the second clamping block is connected with the tension sensor; the resistivity test module is electrically connected with a tested piece; the power supply control system comprises a constant-current power supply and a relay connected with the constant-current power supply; the constant-current power supply is electrically connected with the tested piece; the relay, the stepping motor and the single chip microcomputer are electrically connected with one another. The two-pass shape memory alloy thermal-mechanical functional fatigue test device disclosed by the invention can quantificationally evaluate the thermal-mechanical functional fatigue characteristics of a two-pass shape memory alloy test piece under cyclic loading.

Description

technical field [0001] The invention relates to the field of memory alloy testing devices, in particular to a dual-pass shape memory alloy thermal-mechanical function fatigue characteristic testing device. Background technique [0002] Shape memory alloy (Shape Memory Alloy, SMA) is a kind of alloy material that can "remember" its initial shape, and it is a kind of smart material because it has both sensing and driving functions. Its main functional properties include one-way shape memory effect, two-way shape memory effect and superelasticity. The two-way shape memory effect refers to the phenomenon that the shape memory alloy recovers the shape of the high-temperature phase (austenite phase) when heated, and can recover the shape of the low-temperature phase (martensite phase) when cooled. [0003] The preparation of two-way shape memory alloys usually requires a certain amount of thermomechanical cycle training. In the actual use of two-way shape memory alloy products, ...

AI Technical Summary

Problems solved by technology

Functional fatigue not only affects the life of two-way shape memory alloy products in terms of function realization, but also further causes changes in the microstructure of the alloy and structural damage or fracture, greatly reducing its service life

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