CN209992295U - Miniature SMA wire comprehensive performance experimental device - Google Patents
Miniature SMA wire comprehensive performance experimental device Download PDFInfo
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- CN209992295U CN209992295U CN201920687851.6U CN201920687851U CN209992295U CN 209992295 U CN209992295 U CN 209992295U CN 201920687851 U CN201920687851 U CN 201920687851U CN 209992295 U CN209992295 U CN 209992295U
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Abstract
The utility model relates to a comprehensive performance experimental device of a miniature SMA wire, which comprises a clamp and a clamping device, wherein the clamp is used for fixedly clamping the miniature SMA wire; the micro-motion platform is used for pulling the clamp to stretch the micro SMA wire in the forward direction or pulling the micro SMA wire in the reverse direction; the force sensor is used for measuring the acting force stressed by the stretching or the contraction of the miniature SMA wire; the displacement sensor is used for measuring the deformation quantity of the stretching or the contraction of the miniature SMA wire; the power supply unit is used for providing constant current for the elongated miniature SMA wire and heating the miniature SMA wire to perform phase change contraction; the platinum resistance temperature sensor is used for measuring the temperature of the miniature SMA wire in the phase change process; the control part, force sensor, displacement sensor, power supply unit and platinum resistance temperature sensor all are connected with the control part electricity. The device can realize measuring miniature SMA wire characteristics, has high measurement accuracy, can realize resistance method measurement, obtains the relation between resistance and stress, strain and temperature, and promotes the application of SMA wire in the intelligent structure field.
Description
Technical Field
The utility model relates to a tensile experimental apparatus technical field especially relates to a miniature SMA silk comprehensive properties experimental apparatus.
Background
As a novel functional material, Shape memory alloy (SMA, a material composed of two or more metal elements having a Shape memory effect through thermoelasticity, martensitic transformation and inversion) attracts attention due to its unique Shape memory effect, and has characteristics of high power density, simple structure, good corrosion resistance and biocompatibility, and the like, so that an intelligent structure based on the Shape memory alloy material has a wide prospect in the fields of monitoring, intelligent robots, micro electro mechanical systems, biomedical treatment, and the like.
Since almost all parameters of the shape memory alloy are related to the phase transformation process inside the material, the synchronous study of the phase transformation parameters and the performance parameters is particularly important. The existing metal stretching experiment device is mainly used for stretching experiments of common metals, measurement parameters are single, the size of a stretching sample is large, and the micro shape memory alloy with special functions cannot be measured.
The device can measure the recovery rate and the restoring force of the shape memory alloy wire, but the device can not carry out characteristic measurement on a miniature SMA wire (below millimeter level), can only carry out characteristic measurement on an SMA wire with a large diameter (above millimeter level), has the load of a weight, can not provide continuous load, has no temperature acquisition device, has a single measurement result and has lower precision.
Therefore, the inventor provides a comprehensive performance experimental device for the miniature SMA wire by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a miniature SMA silk comprehensive properties experimental apparatus solves the problem that current tensile experimental facilities can't carry out characteristic measurement to miniature SMA silk, and this experimental apparatus can realize carrying out the characteristic measurement of tensile and contraction state to miniature SMA silk, and measurement accuracy is higher, can realize moreover that the resistance method measures to reach the relation between resistance and stress, meeting an emergency and the temperature, further promote the application of SMA silk in intelligent structure field.
The utility model aims to realize the purpose, and provides a miniature SMA wire comprehensive performance experimental device, which comprises,
the clamp is used for fixedly clamping the miniature SMA wire, at least one end of the clamp can move, and the movable end of the clamp is set as a moving end;
the micro-motion platform is fixedly connected with the moving end of the clamp and is used for pulling the moving end of the clamp to stretch the micro SMA wire in the forward direction or pulling the micro SMA wire in the reverse direction by the contraction deformation force of the micro SMA wire;
the force sensor is used for measuring acting force borne by the miniature SMA wire during stretching or contraction deformation;
the displacement sensor is used for measuring the deformation quantity of the stretching or the contraction of the miniature SMA wire;
the power supply unit is used for providing constant current for the micro SMA wire stretched after being pulled in the forward direction and enabling the micro SMA wire to be heated, phase-changed and contracted;
the platinum resistance temperature sensor is used for measuring the temperature of the miniature SMA wire in the phase change process;
and the force sensor, the displacement sensor, the power supply unit and the platinum resistor temperature sensor are all electrically connected with the control part.
In a preferred embodiment of the present invention, the miniature SMA wire combination property experimental apparatus further includes a heating structure for assisting in heating the miniature SMA wire.
In a preferred embodiment of the present invention, the miniature SMA wire comprehensive performance testing apparatus further comprises a vibration isolation platform, the fixture, the micro-motion platform and the control unit are all disposed on the vibration isolation platform, a moving end of the fixture is fixedly connected to the micro-motion platform, and the other end of the fixture is fixedly disposed on the vibration isolation platform; the force sensor is arranged at one end, close to the clamp, of the micro-motion platform, and the displacement sensor is arranged at one end, far away from the clamp, of the micro-motion platform; the power supply unit is electrically connected to two ends of the miniature SMA wire, and the platinum resistance temperature sensor is connected to the miniature SMA wire in an abutting mode.
In a preferred embodiment of the present invention, the clamp includes a first clamp end structure disposed at the movable end and a second clamp end structure fixedly disposed on the vibration isolation platform; the first clamp end structure comprises a first base, a first connecting head and a first fastening structure are arranged on the first base, the first connecting head is used for connecting the force sensor, and the first fastening structure is used for fixing one end of the miniature SMA wire; the second clamp end structure comprises a second base and a second fastening structure, the second base and the first base are arranged at intervals, a second connector is arranged on the second base and connected with a supporting rod, and the bottom of the supporting rod is fixedly arranged on the vibration isolation platform; the second fastening structure is used for fixing the other end of the miniature SMA wire and is symmetrically arranged with the first fastening structure; the miniature SMA wires between the first fastening structure and the second fastening structure are arranged in parallel or in the same line with the connecting line between the first connecting head and the force sensor.
In a preferred embodiment of the present invention, the first fastening structure includes a first stud disposed vertically upward on the first base, the first stud is used for winding one end of the micro SMA wire, a first fastening nut is sleeved on the first stud, the first fastening nut is used for fixing the micro SMA wire, a first chuck is disposed on one side of the first stud, and the first chuck is used for winding the tightened micro SMA wire; the second fastening structure comprises a second stud vertically and upwards arranged on the second base, the second stud is used for winding the other end of the miniature SMA wire, a second fastening nut is sleeved on the second stud and used for fixing the miniature SMA wire, a second chuck is arranged on one side of the second stud, and the second chuck is used for winding and tightening the miniature SMA wire;
the second stud and the first stud are symmetrically arranged, and the first chuck and the second chuck are symmetrically arranged; the miniature SMA wires between the first chuck and the second chuck are parallel or collinear with a connecting line between the first connecting head and the force sensor.
In a preferred embodiment of the present invention, the heating structure is a heating wire, the first chuck and the second chuck are heat conducting structures, and two ends of the heating wire are respectively connected to the first chuck and the second chuck.
In a preferred embodiment of the present invention, the displacement precision of the micro-motion platform is 0.5 μm; the displacement sensor is a laser displacement sensor, and the precision of the laser displacement sensor is 2.5 mu m; the accuracy of the force sensor is 0.0008N.
The utility model discloses an in a preferred embodiment, power supply unit is for connecting the constant current source modular unit at miniature SMA silk both ends, constant current source modular unit can provide the constant current for miniature SMA silk.
In a preferred embodiment of the present invention, the number of the platinum temperature sensors is 3, and 3 platinum temperature sensors are connected to the micro SMA wire at intervals; the precision of the platinum resistance temperature sensor is 0.4 ℃.
The utility model discloses an in a preferred embodiment, the control part includes data acquisition unit and host computer, force sensor displacement sensor the power supply unit with platinum resistance temperature sensor all with the data acquisition unit electricity is connected, the data acquisition unit with the host computer electricity is connected.
From top to bottom, the utility model provides a miniature SMA silk comprehensive properties experimental apparatus has following beneficial effect:
the utility model provides an among the miniature SMA wire comprehensive properties experimental apparatus, the power that produces when force transducer measures miniature SMA wire flexible deformation, displacement sensor measures the flexible deformation volume of miniature SMA wire, platinum resistance temperature sensor realizes the measurement of miniature SMA wire heating phase transition in-process temperature, resistance method measurement can obtain resistance and stress, meet an emergency and the relation between the temperature, measurement accuracy is higher, each measured data all transmits the control part, the relation performance between each data is more directly perceived, the measurement of the comprehensive properties of miniature SMA wire flexible deformation state has been realized, make the use in the micro-electro-mechanical field of miniature SMA wire more convenient, extensive; each measuring component in the miniature SMA wire comprehensive performance experimental device is arranged on the vibration isolation platform and used for reducing errors caused by vibration; the utility model provides an among the miniature SMA wire comprehensive properties experimental apparatus, anchor clamps have solved the unable miniature diameter wire rod of clamping or the unsafe problem in clamping position of ordinary anchor clamps, and the anchor clamps both ends set up the chuck, can guarantee that the good miniature SMA wire atress direction of clamping and force sensor dynamometry direction are on same axis, make measuring result more accurate.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: do the utility model discloses a miniature SMA wire comprehensive properties experimental apparatus's schematic diagram.
FIG. 2: do the utility model discloses a top view of anchor clamps.
FIG. 3: do the utility model discloses a front view of anchor clamps.
FIG. 4: do the utility model discloses a heating structure and anchor clamps are connected the schematic diagram.
In the figure:
100. a miniature SMA wire comprehensive performance experimental device;
1. a clamp; 11. a first clamp end structure; 111. a first base; 112. a first connector; 113. a first chuck; 114. a first fastening nut; 115. a first stud;
12. a second clamp end structure; 121. a second base; 122. a second connector; 123. a second chuck; 124. a second fastening nut; 125. a second stud;
13. a support bar;
2. a micro-motion platform;
3. a force sensor;
4. a displacement sensor;
5. a power supply unit;
6. a platinum resistance temperature sensor;
7. a vibration isolation platform;
81. a data acquisition unit; 82. an upper computer;
9. micro SMA wires;
10. and heating the structure.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of explanation only and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 4, the present invention provides a comprehensive performance testing apparatus 100 for micro SMA wires, including,
the clamp 1 is used for fixedly clamping a miniature SMA wire 9 (the diameter of the miniature SMA wire 9 is below millimeter level, in a specific embodiment of the utility model, the diameter of the miniature SMA wire 9 is 25 μm), at least one end of the clamp 1 can move, and the movable end of the clamp 1 is set as a moving end;
the micro-motion platform 2 is fixedly connected with the moving end of the clamp 1 and used for pulling the moving end of the clamp 1 to stretch the micro SMA wire 9 in the forward direction or pulling the micro SMA wire 9 in the reverse direction by the contraction deformation force of the micro SMA wire 9;
the force sensor 3 is used for measuring the acting force borne by the miniature SMA wire 9 during stretching or contraction deformation;
the displacement sensor 4 is used for measuring the deformation quantity of the stretching or the contraction of the miniature SMA wire 9;
the power supply unit 5 is used for providing constant current for the micro SMA wire 9 stretched after being pulled in the forward direction and heating the micro SMA wire to perform phase change shrinkage; the existing miniature SMA wire 9 is a one-way memory material, and can only be heated to shrink after the miniature SMA wire 9 is pulled and extended, and the length after the contraction is not less than the original length of the miniature SMA wire 9 before being pulled. Therefore, in order to research the displacement of the miniature SMA wire in the heating phase change process, the miniature SMA wire 9 needs to be pulled and extended through the micro-motion platform 2; under the heat effect of the current, the temperature of the elongated micro SMA wire 9 is increased, and after the phase change temperature of the micro SMA wire 9 is reached, the elongated micro SMA wire 9 is contracted;
a platinum resistance temperature sensor 6 (the platinum resistance temperature sensor 6 is a contact temperature sensor, the resistance value of which changes along with the change of temperature, and the real-time temperature of the SMA wire can be obtained by monitoring the change of the resistance value in real time) for measuring the temperature of the miniature SMA wire 9 in the phase change process;
the control part, the force sensor 3, the displacement sensor 4, the power supply unit 5 and the platinum resistance temperature sensor 6 are all electrically connected with the control part.
The utility model provides an among the miniature SMA wire comprehensive properties experimental apparatus, the power that produces when force sensor measures miniature SMA wire deformation, displacement sensor measures the deformation volume of miniature SMA wire, platinum resistance temperature sensor realizes the measurement of miniature SMA wire phase transition in-process temperature, resistance method measurement can obtain resistance and stress, the relation between meeting an emergency and the temperature, measurement accuracy is higher, each measured data all transmits the control part, more directly perceived of relation performance between each data, the measurement of the comprehensive properties of miniature SMA wire has been realized, it is more convenient to make miniature SMA wire use in the micro-electro-mechanical field, and is extensive.
Further, with reference to fig. 3, in consideration that the resistance of the SMA micro wire is small, and the phase transition temperature of the SMA wire may not be reached by the method of raising the temperature by the current, the comprehensive performance experimental apparatus 100 for the micro SMA wire further includes a heating structure 10 for assisting in heating the micro SMA wire 9, so as to prevent the heating effect of the power supply unit 5 from failing to meet the experimental requirements quickly.
Further, the miniature SMA wire comprehensive performance experiment device 100 further comprises a vibration isolation platform 7, the clamp 1, the micro-motion platform 2 and the control part are all arranged on the vibration isolation platform 7, and each measuring part (comprising the clamp 1, the micro-motion platform 2 and the control part) is arranged on the vibration isolation platform 7 and used for reducing errors caused by vibration. In an ideal state, the friction coefficient between the contact surfaces of the micro-motion platform 2 and the vibration isolation platform 7 is 0 (the friction coefficient between the micro-motion platform and the vibration isolation platform meets the condition that the friction force is nearly zero, so that the micro-motion platform 2 can realize micro-motion); the moving end of the clamp 1 is fixedly connected to the micro-motion platform 2, and the other end of the clamp 1 is fixedly arranged on the vibration isolation platform 7; the force sensor 3 is arranged at one end of the micro-motion platform 2 close to the clamp 1, and the displacement sensor 4 is arranged at one end of the micro-motion platform 2 far away from the clamp 1; the power supply unit 5 is electrically connected with two ends of the miniature SMA wire 9, and the platinum resistance temperature sensor 6 is connected on the miniature SMA wire 9 in an abutting mode.
Further, as shown in fig. 2, 3 and 4, the clamp 1 includes a first clamp end structure 11 disposed at the moving end and a second clamp end structure 12 fixedly disposed on the vibration isolation platform 7; the first clamp end structure 11 comprises a first base 111, wherein a first connecting head 112 and a first fastening structure are arranged on the first base 111, the first connecting head is used for connecting the force sensor 3, and the first fastening structure is used for fixing one end of the miniature SMA wire 9; the second clamp end structure 12 comprises a second base 121 and a second fastening structure, the second base 121 and the first base 111 are arranged at intervals, a second connector 122 is arranged on the second base 121, the second connector 122 is connected with the support rod 13, and the bottom of the support rod 13 is fixedly arranged on the vibration isolation platform 7; the second fastening structure is used for fixing the other end of the miniature SMA wire 9 and is symmetrically arranged with the first fastening structure; the miniature SMA wires 9 between the first fastening structure and the second fastening structure are arranged in parallel or in the same line with the connecting line between the first connecting head 112 and the force sensor 3.
Further, the first fastening structure comprises a first stud 115 vertically and upwardly arranged on the first base 111, the first stud 115 is used for winding one end of the miniature SMA wire 9, a first fastening nut 114 is sleeved on the first stud 115, the first fastening nut 114 is used for fixing the miniature SMA wire 9, a first chuck 113 is arranged on one side of the first stud 115, and the first chuck 113 is used for winding the tightened miniature SMA wire 9; the second fastening structure comprises a second stud 125 vertically and upwards arranged on the second base 121, the second stud 125 is used for winding the other end of the miniature SMA wire 9, a second fastening nut 124 is sleeved on the second stud 125, the second fastening nut 124 is used for fixing the miniature SMA wire 9, a second chuck 123 is arranged on one side of the second stud 125, and the second chuck 123 is used for winding and tightening the miniature SMA wire;
the second stud 125 and the first stud 115 are symmetrically arranged, and the first chuck 113 and the second chuck 123 are symmetrically arranged; the micro SMA wires 9 between the first chuck 113 and the second chuck 123 are arranged in parallel or in the same line with the connecting line between the first connecting head 112 and the force sensor 3.
During the experiment, one end of the miniature SMA wire 9 is wound on the first stud 115, the first fastening nut 114 is screwed, at this time, one end of the miniature SMA wire 9 is clamped, the remaining miniature SMA wire 9 is wound around the first chuck 113, then the other end is repeatedly operated, the other end of the miniature SMA wire 9 is fixed on the second clamp end structure 12, and the connecting line between the clamped miniature SMA wire 9 and the first connecting head 112 and the force sensor 3 is straightened and arranged in parallel or in the same line. The fixture 1 solves the problem that a common fixture cannot clamp a miniature diameter wire or is inaccurate in clamping position, the chucks are arranged at two ends of the fixture 1, the stress direction of the clamped miniature SMA wire 9 and the force measuring direction of the force sensor can be ensured to be on the same axis, and the measuring result is more accurate.
The utility model discloses an in a preferred embodiment, heating structure 10 is the heater strip, and first chuck 113 and second chuck 123 are heat conduction structure, and the both ends of heater strip are supported respectively to lean on connecting on first chuck 113 and second chuck 123, and during the experiment, the heater strip circular telegram intensifies and makes its intensification to first chuck 113 and second chuck 123 heating, makes miniature SMA silk 9 intensify through heat-conduction to reach its phase transition temperature.
Further, the displacement accuracy of the fine movement stage 2 was 0.5 μm. The micro-motion platform 2 moves slightly to drive the force sensor 3 on the micro-motion platform and one end of the clamp 1 to move slightly, so that the micro-SMA wire 9 is stretched or pulled by the contraction force of the micro-SMA wire 9.
Further, the displacement sensor 4 is a laser displacement sensor, and the precision of the laser displacement sensor is 2.5 μm. The laser displacement sensor is fixed and used for measuring the displacement of the force sensor 3 (equivalent to indirectly measuring the deformation quantity of the miniature SMA wire).
Furthermore, the precision of the force sensor 3 is 0.0008N, the precision of the force sensor 3 reaches milli-Newton level, and the measurement precision is high.
Further, the power supply unit 5 is a constant current source module unit connected to two ends of the miniature SMA wire, and the constant current source module unit can provide constant current for the miniature SMA wire. When the resistance method is used for measuring the phase change temperature of the miniature SMA wire, the constant current source module unit is electrically connected with two ends of the miniature SMA wire to form an electric loop, the constant current source module unit provides a small constant current for the loop, the temperature of the miniature SMA wire can change along with the time change, and the resistivity of the miniature SMA wire in martensite and austenite is known to be different, so that the phase change temperature of the miniature SMA wire can be determined. Through the constant current source module unit, a voltage signal can be output, the voltage and the current are known, and the instantaneous resistance can be obtained. And finally, all displacement, force, voltage and temperature signals are collected by the control part and subjected to data analysis.
Further, considering that the measured resistance-temperature relationship is inaccurate due to the fact that the micro SMA wire is heated unevenly due to heat conduction, the number of the platinum resistance temperature sensors 6 is 3, and the 3 platinum resistance temperature sensors 6 are connected to the micro SMA wire 9 in an abutting mode at intervals, so that the temperature change of the micro SMA wire 9 can be monitored more accurately; the accuracy of the platinum resistance temperature sensor 6 is 0.4 ℃.
Further, as shown in fig. 1, the control unit includes a data acquisition unit 81 and an upper computer 82, the force sensor 3, the displacement sensor 4, the power supply unit 5, and the platinum resistance temperature sensor 6 are all electrically connected to the data acquisition unit 81, and the data acquisition unit 81 is electrically connected to the upper computer 82. Force sensor 3 is with the signal transmission to data acquisition unit 81 of the effort that miniature SMA silk 9 received during the experiment, displacement sensor 4 is with the signal transmission to data acquisition unit 81 of the deformation volume of miniature SMA silk 9 during the experiment, platinum resistance temperature sensor 6 is with the signal transmission to data acquisition unit 81 of the phase transition temperature of measurement, power supply unit 5 is with voltage signal transmission to data acquisition unit 81, data acquisition unit 81 is connected with host computer 82 electricity, host computer 82 carries out data analysis, obtain resistance and stress, the relation between strain and the temperature, make the more directly perceived of its relation performance.
When the miniature SMA wire comprehensive performance experiment device 100 of the utility model is used for an experiment, firstly, the micro-motion platform 2 is used for positively pulling the moving end of the clamp 1 to stretch the miniature SMA wire 9, the force sensor 3 transmits the signal of the tensile force borne by the miniature SMA wire 9 to the data acquisition unit 81, the displacement sensor 4 transmits the signal of the tensile deformation of the miniature SMA wire 9 to the data acquisition unit 81, and the data acquisition unit 81 transmits each signal to the upper computer 82; after the micro SMA wire 9 reaches the elongation required by the experiment, the micro motion platform 2 is stopped to be pulled, the power supply unit 5 and the heating structure 10 are electrified, the temperature of the elongated micro SMA wire 9 is increased under the heat effect of current, after the phase change temperature of the micro SMA wire 9 is reached, the elongated micro SMA wire 9 contracts, the micro motion platform 2 moves reversely along with the micro SMA wire, the force sensor 3 transmits the signal of the contraction force of the micro SMA wire 9 to the data acquisition unit 81, the displacement sensor 4 transmits the signal of the contraction deformation of the micro SMA wire 9 to the data acquisition unit 81, the platinum resistance temperature sensor 6 transmits the signal of the measured phase change temperature to the data acquisition unit 81, the power supply unit 5 transmits the voltage signal to the data acquisition unit 81, and the data acquisition unit 81 transmits each signal to the upper computer 82. The utility model discloses a miniature SMA wire comprehensive properties experimental apparatus 100 obtains the relation between resistance and stress, meeting an emergency and the temperature through resistance method measurement, and measurement accuracy is higher, and each measured data all transmits the control part, and the relation performance between each data is more directly perceived, has realized the measurement of miniature SMA wire's comprehensive properties, makes miniature SMA wire convenient more, extensive in the use in micro-electromechanical field.
From top to bottom, the utility model provides a miniature SMA silk comprehensive properties experimental apparatus has following beneficial effect:
the utility model provides an among the miniature SMA wire comprehensive properties experimental apparatus, the force that produces when force sensor measures miniature SMA wire deformation, displacement sensor measures the deformation volume of miniature SMA wire, platinum resistance temperature sensor realizes the measurement of miniature SMA wire phase transition in-process temperature, resistance method measurement can obtain resistance and stress, meet an emergency and the relation between the temperature, measurement accuracy is higher, each measured data all transmits the control part, the relation performance between each data is more directly perceived, the measurement of the comprehensive properties of miniature SMA wire has been realized, make the use in the micro-electro-mechanical field of miniature SMA wire more convenient, extensive; each measuring component in the miniature SMA wire comprehensive performance experimental device is arranged on the vibration isolation platform and used for reducing errors caused by vibration; the utility model provides an among the miniature SMA wire comprehensive properties experimental apparatus, anchor clamps have solved the unable miniature diameter wire rod of clamping or the unsafe problem in clamping position of ordinary anchor clamps, and the anchor clamps both ends set up the chuck, can guarantee that the good miniature SMA wire atress direction of clamping and force sensor dynamometry direction are on same axis, make measuring result more accurate.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (10)
1. A comprehensive performance experimental device of a miniature SMA wire is characterized by comprising,
the clamp is used for fixedly clamping the miniature SMA wire, at least one end of the clamp can move, and the movable end of the clamp is set as a moving end;
the micro-motion platform is fixedly connected with the moving end of the clamp and is used for pulling the moving end of the clamp to stretch the micro SMA wire in the forward direction or pulling the micro SMA wire in the reverse direction by the contraction deformation force of the micro SMA wire;
the force sensor is used for measuring acting force borne by the miniature SMA wire during stretching or contraction deformation;
the displacement sensor is used for measuring the deformation quantity of the stretching or the contraction of the miniature SMA wire;
the power supply unit is used for providing constant current for the micro SMA wire stretched after being pulled in the forward direction and enabling the micro SMA wire to be heated, phase-changed and contracted;
the platinum resistance temperature sensor is used for measuring the temperature of the miniature SMA wire in the phase change process;
and the force sensor, the displacement sensor, the power supply unit and the platinum resistor temperature sensor are all electrically connected with the control part.
2. The miniature SMA wire combination property experimental apparatus of claim 1, further comprising a heating structure for assisting in heating the miniature SMA wire.
3. The miniature SMA wire comprehensive performance experiment device of claim 2, further comprising a vibration isolation platform, wherein the fixture, the micromotion platform and the control part are all arranged on the vibration isolation platform; the moving end of the clamp is fixedly connected to the micro-motion platform, and the other end of the clamp is fixedly arranged on the vibration isolation platform; the force sensor is arranged at one end, close to the clamp, of the micro-motion platform, and the displacement sensor is arranged at one end, far away from the clamp, of the micro-motion platform; the power supply unit is electrically connected to two ends of the miniature SMA wire, and the platinum resistance temperature sensor is connected to the miniature SMA wire in an abutting mode.
4. The miniature SMA wire comprehensive performance test device according to claim 3, wherein the clamp comprises a first clamp end structure arranged at the movable end and a second clamp end structure fixedly arranged on the vibration isolation platform; the first clamp end structure comprises a first base, a first connecting head and a first fastening structure are arranged on the first base, the first connecting head is used for connecting the force sensor, and the first fastening structure is used for fixing one end of the miniature SMA wire; the second clamp end structure comprises a second base and a second fastening structure, the second base and the first base are arranged at intervals, a second connector is arranged on the second base and connected with a supporting rod, and the bottom of the supporting rod is fixedly arranged on the vibration isolation platform; the second fastening structure is used for fixing the other end of the miniature SMA wire and is symmetrically arranged with the first fastening structure; the miniature SMA wires between the first fastening structure and the second fastening structure are arranged in parallel or in the same line with the connecting line between the first connecting head and the force sensor.
5. The experimental device for comprehensive performance of miniature SMA wires according to claim 4, wherein the first fastening structure comprises a first stud vertically and upwardly arranged on the first base, the first stud is used for winding one end of the miniature SMA wires, a first fastening nut is sleeved on the first stud and used for fixing the miniature SMA wires, a first chuck is arranged on one side of the first stud and used for winding the tightened miniature SMA wires; the second fastening structure comprises a second stud vertically and upwards arranged on the second base, the second stud is used for winding the other end of the miniature SMA wire, a second fastening nut is sleeved on the second stud and used for fixing the miniature SMA wire, a second chuck is arranged on one side of the second stud, and the second chuck is used for winding and tightening the miniature SMA wire;
the second stud and the first stud are symmetrically arranged, and the first chuck and the second chuck are symmetrically arranged; the miniature SMA wires between the first chuck and the second chuck are parallel or collinear with a connecting line between the first connecting head and the force sensor.
6. The experimental apparatus for comprehensive performance of miniature SMA wire according to claim 5, wherein the heating structure is a heating wire, the first chuck and the second chuck are heat conducting structures, and two ends of the heating wire are respectively connected to the first chuck and the second chuck.
7. The experimental device for the comprehensive performance of the miniature SMA wire according to claim 1, wherein the displacement precision of the micro-motion platform is 0.5 μm; the displacement sensor is a laser displacement sensor, and the precision of the laser displacement sensor is 2.5 mu m; the accuracy of the force sensor is 0.0008N.
8. The experimental apparatus for comprehensive performance of miniature SMA wire according to claim 1, wherein the power supply unit is a constant current source module unit connected to two ends of the miniature SMA wire, and the constant current source module unit can provide constant current for the miniature SMA wire.
9. The experimental device for the comprehensive performance of the miniature SMA wire according to claim 1, wherein the number of the platinum resistance temperature sensors is 3, and the 3 platinum resistance temperature sensors are connected to the miniature SMA wire in an abutting manner at intervals; the precision of the platinum resistance temperature sensor is 0.4 ℃.
10. The experimental device for the comprehensive performance of the miniature SMA wire according to claim 1, wherein the control part comprises a data acquisition unit and an upper computer, the force sensor, the displacement sensor, the power supply unit and the platinum resistance temperature sensor are all electrically connected with the data acquisition unit, and the data acquisition unit is electrically connected with the upper computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110082208A (en) * | 2019-05-14 | 2019-08-02 | 中国石油大学(北京) | Miniature SMA comprehensive characteristic test device |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082208A (en) * | 2019-05-14 | 2019-08-02 | 中国石油大学(北京) | Miniature SMA comprehensive characteristic test device |
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