CN102965488A - Heating method of shape memory alloy rod - Google Patents
Heating method of shape memory alloy rod Download PDFInfo
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- CN102965488A CN102965488A CN2012104452742A CN201210445274A CN102965488A CN 102965488 A CN102965488 A CN 102965488A CN 2012104452742 A CN2012104452742 A CN 2012104452742A CN 201210445274 A CN201210445274 A CN 201210445274A CN 102965488 A CN102965488 A CN 102965488A
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- shape memory
- memory alloy
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- nichrome wire
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Abstract
The invention discloses a heating method of a shape memory alloy rod, which comprises the following steps: (1) drilling one or more through holes inside the shape memory alloy rod in the longitudinal direction; (2) penetrating a heating wire with an insulating material attached to the surface through each hole of the shape memory alloy rod; (3) after the heating wire penetrates through the hole of the shape memory alloy rod, electrifying to heat the heating wire; and (4) transferring heat of the heating wire to the shape memory alloy rod in a heat transfer mode, and finishing the austenite phase change when the temperature of the shape memory alloy rod reaches the austenite phase change finishing temperature. The method disclosed by the invention has the advantages of high heating efficiency, simple steps and the like, and the heating efficiency can be further enhanced by increasing the quantity of the heating wires in the shape memory alloy rod.
Description
Technical field
The present invention relates to the civil engineering structure field of intelligent control technology, be specifically related to a kind of heating means of shape memory alloy bar.
Background technology
Shape memory alloy is a kind of functional materials that has perception concurrently and drive function, has been widely used at present the fields such as instrument, automatically control, aerospace, medical apparatus, automobile engineering, civil engineering work, robot.
The application of shape memory alloy in civil engineering structure comprises aspect two of Passive Control and the ACTIVE CONTROL, wherein the latter utilizes the distinctive shape memory effect of shape memory alloy, the shape memory alloy that is in martensitic state under the normal temperature is installed in the civil engineering structure, the distortion of structure can be brought out shape memory alloy generation distortion under the environmental activity, this moment is as long as be heated to it more than austenite phase transformation end temp with shape memory alloy, shape memory alloy will present unique shape memory effect, and then civil engineering structure is produced very large restoring force to reduce the distortion of civil engineering structure.
At present, people are many to the research and comparison of the less filamentous form shape memory alloys of cross-sectional area, although the resistance of shape-memory alloy wire is relatively large, but direct-electrifying heats, but the restoring force of its generation is limited and can not bear shearing, has a strong impact on its practical engineering application.People begin the bar-like shape memorial alloy is paid close attention to for this reason, propose at the positions such as metro shield segment bolt, column bolt, steel construction beam-column joint employing shape memory alloy bar.But because the cross-sectional area of bar-like shape memorial alloy is larger, resistance is less, if directly to its heat treated of switching on, heating efficiency is poor.Therefore, in the urgent need to seeking a kind of high-efficiency heating method of bar-like shape memorial alloy.
Summary of the invention
The shortcoming that the object of the invention is to overcome prior art provides a kind of heating efficiency height, step simply and need not to change the shape memory alloy bar outer shape and just can realize the heating means to its shape memory alloy bar that heats with not enough.These heating means impel shape memory alloy bar to be changed to the austenitic state under the high temperature by the martensitic state under the normal temperature, and then utilize its shape memory effect to realize effective control of civil engineering structure.
Purpose of the present invention is achieved through the following technical solutions: a kind of heating means of shape memory alloy bar may further comprise the steps:
(1) drills through along its length one or more holes in shape memory alloy bar inside;
(2) surface is passed the hole of shape memory alloy bar with the nichrome wire of insulating material;
(3) after nichrome wire passes the hole of shape memory alloy bar, to the nichrome wire heating of switching on;
(4) nichrome wire sends the mode of heat by the heat transmission to shape memory alloy bar, and when the temperature of shape memory alloy bar reached its austenite phase transformation end temp, austenite phase transformation was finished.
Preferably, on the described shape memory alloy bar internal diameter specific surface of hole with the large 1mm～5mm of external diameter of the nichrome wire of insulating material.
Preferably, shape memory alloy bar inside hole is along its length stretched out at described nichrome wire two ends.
Preferably, shape memory alloy bar is martensitic state at normal temperatures in the described step (1), in described step (3) heat-processed, by temperature control unit the temperature on nichrome wire surface is controlled between the austenite phase transformation end temp of shape memory alloy bar and the top temperature that insulating material can bear.
Preferably, the top temperature that the insulating material that described nichrome wire surface has can bear is not less than 200 ℃, and the size of thermal conductivity is not less than 0.5W/m.k.
Preferably, described nichrome wire is made by Fe-Cr-Al wire, and it is shaped as spring-like.
Preferably, the insulating material had of described nichrome wire surface is heat conduction silica gel cloth, boron nitride coating or silica gel.
Preferably, described shape memory alloy bar hole penetrates a nichrome wire.
The present invention has following advantage and effect with respect to prior art:
(1) heating means of shape memory alloy bar of the present invention are by in the hole of shape memory alloy bar inside nichrome wire being set, then to the nichrome wire heating of switching on, nichrome wire sends its heat to shape memory alloy bar by the mode of heat transmission, and then realizes the larger shape memory alloy bar of cross section is heated; Employed heating means are fairly simple, and rate of heating is also very fast, and need not to change the outer shape of shape memory alloy bar.With respect to directly shape memory alloy bar being led to electrically heated mode, the heating efficiency of the inventive method has apparent in view raising.In addition, the present invention can also place respectively nichrome wire by drilling through a plurality of holes in shape memory alloy bar inside, thereby further improves the heating efficiency of shape memory alloy bar.
(2) nichrome wire in the heating means of the present invention is positioned at shape memory alloy bar inside, on the force way of shape memory alloy bar and with all kinds of distortion such as to be connected impact less, and shape memory alloy bar can directly bear tension and compression, shear, reverse of other member.
(3) heating means of the present invention are controlled in certain scope by the temperature of temperature control unit with nichrome wire, prevent the excessively low austenite phase transformation end temp that does not reach shape memory alloy of temperature, cause to finish the phase transformation of shape memory alloy, or excess Temperature causes insulating material to lose efficacy above the top temperature that insulating material can bear.
Description of drawings
Synoptic diagram when Fig. 1 is a nichrome wire of heating means employing of the present invention.
Fig. 2 is the synoptic diagram of nichrome wire position in shape memory alloy of heating means of the present invention.
Fig. 3 is the enlarged diagram at Fig. 2 center hole position.
Synoptic diagram when Fig. 4 is five nichrome wire of heating means employing of the present invention.
Fig. 5 is the synoptic diagram of five nichrome wire positions in shape memory alloy of heating means of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
Shown in Fig. 1 and 5, the heating unit of the shape memory alloy bar that present embodiment adopts comprises the nichrome wire 5 that 220V AC power, temperature control unit 1, switch 2 and Fe-Cr-Al wire are made, nichrome wire 5 pass shape memory alloy bar 4 inside along its length hole 3 and with temperature control unit 1, power supply and switch 2 by the series connection mode be connected, the surface of nichrome wire 5 is wound with insulating material heat conduction silica gel cloth 6.
Temperature control unit 1 is by voltage or electric current in the regulating circuit, and then reaches the effect of the temperature of regulating nichrome wire 5.
Wherein the insulating material on nichrome wire 5 surfaces also can replace with boron nitride coating or silica gel.
Embodiment 1
As shown in Figure 1, the heating means of shape memory alloy bar comprise a nichrome wire 5 in the present embodiment.
The heating means of shape memory alloy bar shown in Figure 1 may further comprise the steps:
(1) selecting a length is 150mm, and diameter is the shape memory alloy bar 4 that is in martensitic state under 30mm and the normal temperature, and wherein the austenite phase transformation end temp of this shape memory alloy bar 4 is 126 ℃.The hole 3 that to drill through along its length a diameter in shape memory alloy bar 4 inside be 6mm.
(2) as shown in Figures 2 and 3, selecting a length is that 200mm, standard power are the spring-like nichrome wire 5 of 500W, and wherein this nichrome wire is to be that the Fe-Cr-Al wire of 0.35mm is made by diameter; The external diameter of nichrome wire is about 4mm, the top temperature of twining two layers of thickness on the surface of nichrome wire 5 and be 0.23 ~ 0.28mm, thermal conductivity and be 0.75W/m.k and can bear is 260 ℃ heat conduction silica gel cloth 6, the external diameter that twines the nichrome wire 5 behind the heat conduction silica gel cloth 6 is about 5mm, and the nichrome wire 5 that heat conduction silica gel cloth 6 is being twined on the surface passes the hole 3 of shape memory alloy bar 4; Shape memory alloy bar 4 inside hole 3 each 25mm are along its length stretched out at nichrome wire 5 two ends.
(3) nichrome wire 5 passes the hole 3 rear pluggeds of shape memory alloy bar 4, to nichrome wire 5 heating of switching on; Temperature control unit 1 is controlled at the temperature on nichrome wire 5 surfaces about 200 ℃.
(4) nichrome wire 5 sends the mode of heat by the heat transmission to shape memory alloy bar 4, and when the temperature of shape memory alloy bar 4 reached its austenite phase transformation end temp, austenite phase transformation was finished.
After heating through the heating means of present embodiment shape memory alloy bar 4, it is 25.5 minutes that shape memory alloy bar 4 outside surfaces reach its austenite phase transformation end temp required energising heat-up time.
Embodiment 2
As shown in Figure 4, present embodiment is the further improvement of embodiment 1, comprise five nichrome wire in the heating means of present embodiment shape memory alloy bar, five nichrome wire are connected with temperature control unit, power supply and the switch mode by series connection respectively, be in parallel the relation between five nichrome wire namely.
The difference of the heating means among the step of the heating means of present embodiment shape memory alloy bar and the embodiment 1 only is: (1) as shown in Figure 5, the hole 3 that it is 6mm that the step of present embodiment (1) drills through 5 diameters along its length in shape memory alloy bar 4 inside; (2) present embodiment is in step (2), selecting five length is that 200mm, standard power are the spring-like nichrome wire 5 of 500W, twines two layers of thickness on the surface of every nichrome wire 5 and be 0.23 ~ 0.28mm, thermal conductivity and be 0.75W/m.k and the top temperature that can bear is 260 ℃ heat conduction silica gel cloth 6; (3) five nichrome wire are passed respectively five holes 3 of shape memory alloy bar 4 in step (3), each hole penetrates a nichrome wire.
After heating through the heating means of present embodiment shape memory alloy bar 4, it is 7.2 minutes that shape memory alloy bar 4 outside surfaces reach its austenite phase transformation end temp required energising heat-up time.
The internal diameter specific surface of hole is through the large 1mm～5mm of external diameter of the nichrome wire of insulation processing on the shape memory alloy bar, among present embodiment 1 and the embodiment 2 on the shape memory alloy bar about the external diameter large 1mm of the internal diameter specific surface of hole through the nichrome wire of insulation processing.The top temperature that insulating material can bear is for being not less than 200 ℃, and the size of thermal conductivity is not less than 0.5W/m.k, and the top temperature that can bear of the heat conduction silica gel cloth that present embodiment 1 and embodiment 2 select is 260 ℃, and thermal conductivity is 0.75W/m.k.
The difference of embodiment 1 and embodiment 2 only is to be arranged on the different amts of the nichrome wire 5 in the shape memory alloy bar 4, therefore both to reach the required energising of its austenite phase transformation end temp at shape memory alloy bar 4 outside surfaces also different heat-up time, nichrome wire 5 quantity are more, the required logical electrically heated time is shorter, and namely efficient is higher.So can improve by suitable increase nichrome wire 5 quantity the heating efficiency of shape memory alloy bar.
Present embodiment sends the mode of heat by the heat transmission to shape memory alloy bar 4 by nichrome wire, thereby realizes shape memory alloy bar is heated, and heating means are very simple, realize easily.The method of present embodiment is controlled in certain scope by the temperature of temperature control unit with nichrome wire, preventing that temperature is excessively low does not reach the austenite phase transformation end temp of shape memory alloy and causes finishing the phase transformation of shape memory alloy, and perhaps excess Temperature surpasses the top temperature that insulating material can bear and causes insulating material to lose efficacy.
Above-mentioned two embodiment are the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. the heating means of a shape memory alloy bar is characterized in that, may further comprise the steps:
(1) drills through along its length one or more holes in shape memory alloy bar inside;
(2) surface is passed the hole of shape memory alloy bar with the nichrome wire of insulating material;
(3) after nichrome wire passes the hole of shape memory alloy bar, to the nichrome wire heating of switching on;
(4) nichrome wire sends the mode of heat by the heat transmission to shape memory alloy bar, and when the temperature of shape memory alloy bar reached its austenite phase transformation end temp, austenite phase transformation was finished.
2. the heating means of shape memory alloy bar according to claim 1 is characterized in that, the internal diameter specific surface of hole is with the large 1mm～5mm of external diameter of the nichrome wire of insulating material on the described shape memory alloy bar.
3. the heating means of shape memory alloy bar according to claim 1 is characterized in that, shape memory alloy bar inside hole is along its length stretched out at described nichrome wire two ends.
4. the heating means of shape memory alloy bar according to claim 1, it is characterized in that, shape memory alloy bar is martensitic state at normal temperatures in the described step (1), in described step (3) heat-processed, by temperature control unit the temperature on nichrome wire surface is controlled between the austenite phase transformation end temp of shape memory alloy bar and the top temperature that insulating material can bear.
5. the heating means of shape memory alloy bar according to claim 1 is characterized in that, the top temperature that the insulating material that described nichrome wire surface has can bear is for being not less than 200 ℃, and the size of thermal conductivity is not less than 0.5W/m.k.
6. the heating means of shape memory alloy bar according to claim 1 is characterized in that, described nichrome wire is made by Fe-Cr-Al wire, and it is shaped as spring-like.
7. the heating means of shape memory alloy bar according to claim 1 is characterized in that, the insulating material that described nichrome wire surface has is heat conduction silica gel cloth, boron nitride coating or silica gel.
8. the heating means of shape memory alloy bar according to claim 1 is characterized in that, a hole of described shape memory alloy bar penetrates a nichrome wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210445274.2A CN102965488B (en) | 2012-11-08 | 2012-11-08 | Heating method of shape memory alloy rod |
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| CN201210445274.2A CN102965488B (en) | 2012-11-08 | 2012-11-08 | Heating method of shape memory alloy rod |
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| CN102965488A true CN102965488A (en) | 2013-03-13 |
| CN102965488B CN102965488B (en) | 2014-06-11 |
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| CN201210445274.2A Expired - Fee Related CN102965488B (en) | 2012-11-08 | 2012-11-08 | Heating method of shape memory alloy rod |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758532A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | Short-term driving reinforcing method for metro shield tunnel pipe piece joint |
| CN110426146A (en) * | 2019-07-16 | 2019-11-08 | 西安建筑科技大学 | A kind of heating device for marmem constraint restoring force test |
| CN111534770A (en) * | 2020-05-12 | 2020-08-14 | 华南理工大学 | Near-equal atomic ratio nickel-rich nickel-titanium alloy two-way shape memory effect training method |
| CN112858033A (en) * | 2021-01-07 | 2021-05-28 | 重庆理工大学 | Electric heating shape memory alloy spring performance test system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH035128A (en) * | 1989-06-01 | 1991-01-10 | Mitsubishi Heavy Ind Ltd | Shape memory member |
| FR2839880A1 (en) * | 2002-05-21 | 2003-11-28 | Groupe Lepine | Connecting bar for intervertebral fixator used in spinal correction has duct for heat exchange fluid to actuate shape memory metal |
| CN1474111A (en) * | 2003-07-24 | 2004-02-11 | 同济大学 | High temperature air heater |
| CN201243385Y (en) * | 2008-08-13 | 2009-05-20 | 常州市第一橡塑设备有限公司 | Electric heating plate device |
-
2012
- 2012-11-08 CN CN201210445274.2A patent/CN102965488B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH035128A (en) * | 1989-06-01 | 1991-01-10 | Mitsubishi Heavy Ind Ltd | Shape memory member |
| FR2839880A1 (en) * | 2002-05-21 | 2003-11-28 | Groupe Lepine | Connecting bar for intervertebral fixator used in spinal correction has duct for heat exchange fluid to actuate shape memory metal |
| CN1474111A (en) * | 2003-07-24 | 2004-02-11 | 同济大学 | High temperature air heater |
| CN201243385Y (en) * | 2008-08-13 | 2009-05-20 | 常州市第一橡塑设备有限公司 | Electric heating plate device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758532A (en) * | 2014-01-28 | 2014-04-30 | 华南理工大学 | Short-term driving reinforcing method for metro shield tunnel pipe piece joint |
| CN103758532B (en) * | 2014-01-28 | 2016-01-06 | 华南理工大学 | A kind of short-term active enforcement method of metro shield tunnel pipe piece joint |
| CN110426146A (en) * | 2019-07-16 | 2019-11-08 | 西安建筑科技大学 | A kind of heating device for marmem constraint restoring force test |
| CN111534770A (en) * | 2020-05-12 | 2020-08-14 | 华南理工大学 | Near-equal atomic ratio nickel-rich nickel-titanium alloy two-way shape memory effect training method |
| CN112858033A (en) * | 2021-01-07 | 2021-05-28 | 重庆理工大学 | Electric heating shape memory alloy spring performance test system |
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| CN102965488B (en) | 2014-06-11 |
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