Apparatus and method for tensile testing of shape memory alloy wire

Abstract

The present application provides a device for tensile testing of shape memory alloy wires and a method for tensile testing of shape memory alloy wires using the device. The device includes: a base plate; a first fixed component and a second fixed component, which are arranged at two ends of the base plate relative to each other; a group of anchoring components are correspondingly arranged on the first fixed component and the second fixed component, which are used to anchor the shape memory alloy wire; a first sliding component, which is slidably connected between the first fixed component and the second fixed component through a guide component, and the shape memory alloy wire is compressed by a clamping structure arranged thereon; a first rotating adjustment component, which connects the first fixed component and the first sliding component, drives the first sliding component to slide along the guide component, thereby stretching the shape memory alloy wire. By adjusting the position of the first sliding component along the guide component, the stretching range can be adjusted; by cooperating with the rotating adjustment component and the guide component, stretching can be easily achieved.

Description

Technical Field

[0001] The present application relates to the field of smart materials, and specifically to a device and method for tensile testing of shape memory alloy wires. Background Art

[0002] Shape memory alloy (SMA) is a new type of intelligent material. Due to its superelasticity, shape memory effect, excellent biocompatibility and wear resistance, it has been widely used in many fields such as micro-electromechanical systems, biomedicine and organ transplantation, transportation, aerospace and civil engineering. Due to the characteristics of SMA such as low mass, rapid response, small size and large driving force, new equipment with SMA as the core has replaced a large number of traditional mechanical structures and has broad application prospects.

[0003] SMA has two crystal structures, austenite and martensite. In a low-temperature environment, SMA is in a stable state, and the crystal state of SMA is martensite; in a high-temperature environment, if it is not subjected to external stress, SMA is in a stable austenite state. When the SMA in a low-temperature state is heated, the martensite crystals inside the SMA will be transformed into an austenite crystal state within a certain period of time. This process is called austenite phase transformation, and it is also the process by which SMA realizes shape memory function. Unlike ordinary metals or alloys, SMA has a recoverable strain rate of up to 7%-8%, while the recoverable strain rate of commonly used ordinary metal steel is less than 1%.

[0004] Due to the characteristics of SMA such as simple excitation mode, high force-to-weight ratio, and quiet operation, SMA materials have been widely used in the design and development of actuators, among which shape memory alloy wire is the most common form. When shape memory alloy wire is used in intelligent actuators, it is first necessary to accurately pre-stretch the shape memory alloy wire. Accurate stretching can ensure that the shape memory alloy wire can achieve the preset deformation recovery during phase change. This is the prerequisite for the realization of the actuator function. Therefore, an accurate tensile test device for shape memory alloy wire is of great significance for the application of shape memory alloy wire. Summary of the invention

[0005] In order to solve the problems existing in the existing shape memory alloy wire stretching devices, such as the inability to accurately control the strain, the inability to adjust the stretching length range or the limited adjustment range, uneven force application, complex structure, inconvenient operation, and poor scalability, the present application aims to provide a device for shape memory alloy wire stretching test and a method for shape memory alloy wire stretching test using the device.

[0006] According to a first exemplary embodiment of the present application, an apparatus for a shape memory alloy wire tensile test includes:

[0007] Base plate;

[0008] A first fixing component and a second fixing component are arranged at two ends of the bottom plate opposite to each other; a group of anchoring components are correspondingly arranged on the first fixing component and the second fixing component for anchoring the shape memory alloy wire;

[0009] A first sliding component is slidably connected between the first fixing component and the second fixing component through a guide component, and compresses the shape memory alloy wire through a compressing structure provided thereon;

[0010] The first rotation adjustment component connects the first fixing component and the first sliding component, and drives the first sliding component to slide along the guide component, thereby stretching the shape memory alloy wire.

[0011] According to some embodiments of the present application, the device is characterized by further comprising:

[0012] a second sliding component, arranged opposite to the first sliding component, slidably connected between the first fixing component and the second fixing component through the guide component and pressing the shape memory alloy wire;

[0013] a second rotation adjustment component, connecting the second fixing component and the second sliding component, and driving the second sliding component to slide along the guide component, thereby stretching the shape memory alloy wire;

[0014] The distance between the first sliding component and the second sliding component is adjustable.

[0015] According to some embodiments of the present application, the first rotation adjustment component includes:

[0016] a threaded connecting rod, one end of which passes through the first fixing component and is connected to the first sliding component;

[0017] A rotating hand wheel is arranged at the other end of the threaded connecting rod, and the first sliding component is driven to slide along the guide component by rotating the rotating hand wheel.

[0018] According to some embodiments of the present application, the first rotation adjustment component further includes:

[0019] The embossed knob is arranged between the rotating hand wheel and the first fixing component and is connected to the threaded connecting rod through threads.

[0020] According to some embodiments of the present application, the device further includes:

[0021] A measuring component, parallel to the shape memory alloy wire, and disposed on the bottom plate;

[0022] The measuring component comprises a measuring ruler, and the measuring ruler is connected to or integrally formed with the base plate.

[0023] According to some embodiments of the present application, the anchoring assembly includes:

[0024] Anchor holes;

[0025] An anchor plug cooperates with the anchor hole to anchor the shape memory alloy wire passing through the central hole of the anchor plug.

[0026] According to some embodiments of the present application, the guide component is connected to the first sliding component via an oil-free bushing.

[0027] According to some embodiments of the present application, the guide component includes:

[0028] A first guide shaft, corresponding to one end connecting the first fixing component and the second fixing component; and

[0029] The second guide shaft corresponds to the other end connecting the first fixing component and the second fixing component.

[0030] The present application also provides a method for performing a tensile test on a shape memory alloy wire using the device, comprising:

[0031] Passing the shape memory alloy wire through the first fixing component, the first sliding component and the second fixing component in sequence;

[0032] Anchoring the shape memory alloy wire by the first fixing member and the second fixing member;

[0033] adjusting the position of the first sliding component along the guide component and pressing the shape memory alloy wire;

[0034] The first rotation adjustment component is rotated to drive the first sliding component to slide along the guide component, thereby stretching the shape memory alloy wire.

[0035] The present application also provides another method for performing a tensile test on a shape memory alloy wire using the device, comprising:

[0036] Passing the shape memory alloy wire through the first fixing component, the first sliding component, the second sliding component and the second fixing component in sequence;

[0037] Anchoring the shape memory alloy wire by the first fixing member and the second fixing member;

[0038] adjusting the distance between the first sliding component and the second sliding component along the guide component and pressing the shape memory alloy wire;

[0039] The first rotation adjustment component and / or the second rotation adjustment component are rotated to respectively drive the first sliding component and the second sliding component to slide along the guide component, thereby stretching the shape memory alloy wire.

[0040] The device for shape memory alloy wire tensile test provided by the present application can not only stretch multiple shape memory alloy wire bundles at the same time, but also adjust the length of the shape memory alloy wire to be stretched in a wide range by adjusting the position of the sliding component before pressing; the tensile strain of the shape memory alloy wire can be accurately guaranteed by the measuring device to avoid the retraction of the shape memory alloy wire; the stretching can be easily achieved by rotating the adjustment component and cooperating with the guide component, and it has the characteristics of simple structure, easy operation, and controllable applied stress and strain. The device can also be used for the tensioning of other prestressed metal wires, and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present application.

[0042] Figure 1 A front view of a device for shape memory alloy wire tensile testing according to a first exemplary embodiment of the present application is shown;

[0043] Figure 2 A left side view of a device for shape memory alloy wire tensile testing according to a first exemplary embodiment of the present application is shown;

[0044] Figure 3 A schematic diagram of an anchoring assembly according to an exemplary embodiment of the present application is shown;

[0045] Figure 4 A schematic diagram of a base plate according to an exemplary embodiment of the present application is shown;

[0046] Figure 5 A schematic diagram of a fixing component and a rotation adjustment component according to an exemplary embodiment of the present application is shown;

[0047] Figure 6 A schematic diagram of a sliding component according to an exemplary embodiment of the present application is shown;

[0048] Figure 7 A front view of a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application is shown;

[0049] Figure 8A top view of a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application is shown;

[0050] Fig. 9 A perspective view showing a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application;

[0051] Fig.10 A schematic diagram of the maximum stretching length according to an exemplary embodiment of the present application is shown;

[0052] Fig.11 A schematic diagram of the minimum stretching length according to an exemplary embodiment of the present application is shown;

[0053] Fig.12 A flow chart of a method for tensile testing of a shape memory alloy wire according to a first exemplary embodiment of the present application is shown;

[0054] Fig.13 A flow chart of a method for tensile testing of a shape memory alloy wire according to a second exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0056] The terms "first", "second", etc. of the present application are used to distinguish different objects, rather than to describe a predetermined order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0057] Reference to "embodiment" herein means that the predetermined features, structures, or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] The inventors have found that among the existing stretching devices for shape memory alloy wires, some stretching devices pass through the threaded holes on the frame through the upper and lower stretching screws, and then the frame is driven to move by the rotation of the nut to achieve the purpose of stretching the shape memory alloy wire. Some stretching devices stretch the shape memory alloy wire by forming a metal wire stretching fixture with clamping units respectively attached to both ends of the metal wire. Although the existing stretching device can prevent the metal wire from falling off the fixture during the tensile test, thereby ensuring the stable operation of the metal wire tensile test, there are still problems such as uneven force application, complex structure, inconvenient operation, inability to accurately control the strain, inability to adjust the stretching length range or limited adjustment range, and poor promotion, which seriously limit the application of shape memory alloy wires.

[0059] Therefore, in order to solve the above problems existing in the existing shape memory alloy wire stretching device, the present application provides a shape memory alloy wire stretching device with stable and reliable performance, simple structure, easy operation, capable of controlling the stretching length range of the shape memory alloy wire and accurately controlling the stretching strain. The technical solution of the present application will be described in detail below in conjunction with the accompanying drawings.

[0060] Figure 1 A front view of a device for shape memory alloy wire tensile testing according to a first exemplary embodiment of the present application is shown; Figure 2 A left side view of a device for shape memory alloy wire tensile testing according to a first exemplary embodiment of the present application is shown.

[0061] See also Figure 1-Figure 2 According to the first exemplary embodiment of the present application, the device 1000 for tensile testing of shape memory alloy wire provided by the present application includes a base plate 100, a first fixing component 200, a second fixing component 300, a first sliding component 400, a guide component 500 and a first rotation adjustment component 600. The first fixing component 200 and the second fixing component 300 may have the same structure and are relatively arranged at both ends of the base plate 100, for example, symmetrically arranged on the left and right sides of the base plate 100. A set of anchoring components 210 (see FIG. 2 ) are correspondingly arranged on the first fixing component 200 and the second fixing component 300. Figure 2 ), used to anchor a set of shape memory alloy wires 10 passing through the device 1000.

[0062] The first sliding component 400 is slidably connected between the first fixed component 200 and the second fixed component 300 through the guide component 500, and during the stretching process, a group of shape memory alloy wires 10 passing through the device 1000 are pressed by the pressing structure arranged thereon. The first rotation adjustment component 600 connects the first fixed component 200 and the first sliding component 400. After the shape memory alloy wire 10 is pressed by the first sliding component 400, the first sliding component 400 can be driven to slide along the guide component 500 by rotating the first rotation adjustment component 600, thereby stretching the shape memory alloy wire 10.

[0063] According to a preferred embodiment of the present application, the guide component 500 can be provided with two guide shafts, namely a first guide shaft and a second guide shaft. The first guide shaft corresponds to one end connecting the first fixing component 200 and the second fixing component 300. The second guide shaft corresponds to the other end connecting the first fixing component 200 and the second fixing component 300. By providing two guide shafts, the stable sliding of the first sliding component 400 can be further ensured, thereby ensuring the uniform stretching of the shape memory alloy wire 10.

[0064] The device 1000 provided in the present application has a simple and compact overall structure and is easy to operate. By rotating the rotary adjustment component 600, stretching can be easily achieved; and due to the presence of the guide component 500, the force is applied evenly during the entire pulling process, thereby achieving synchronous and uniform stretching of multiple shape memory alloy wires. During the tensile test of the shape memory alloy wire 10, the stretched length can be adjusted by the distance between the first sliding component 400 and the second fixing component 300, thereby solving the problem that the stretching length range cannot be adjusted or the adjustment range is limited.

[0065] Figure 3 A schematic diagram of an anchoring assembly according to an exemplary embodiment of the present application is shown.

[0066] like Figure 3 As shown, according to an exemplary embodiment of the present application, the anchoring assembly 210 includes an anchor hole 211 and an anchor plug 212. The anchor plug 212 cooperates with the anchor hole 211 to anchor the shape memory alloy wire 10 passing through the center hole of the anchor plug 212. The first fixing component 200 and the second fixing component 300 are respectively provided with a conical anchor hole 211. An annular groove is provided on the anchor plug 212. The convex and concave engagement structure of the anchor plug 212 and the anchor hole 211 can ensure the correct cooperation between the two. A center hole is provided in the center of the anchor plug 212, and the shape memory alloy wire 10 can pass through the center hole and be anchored.

[0067] When the shape memory alloy wire 10 is stretched, the two ends of the shape memory alloy wire are in a fixed state through the anchoring components 210 on both sides, which can ensure the position accuracy of the shape memory alloy wire and ensure the stretching accuracy. After the stretching is completed, after the clamping structure of the first sliding component 400 is released, the shape memory alloy wire 10 will shrink a little. The shrinkage is mainly residual strain, and the convex and concave clamping structure can bear the stress generated by the shrinkage deformation of the shape memory alloy wire after stretching.

[0068] Figure 4 A schematic diagram of a base plate according to an exemplary embodiment of the present application is shown.

[0069] like Figure 4 As shown, the bottom plate 100 can be a steel plate 110, on which a groove 120 can be provided to reduce the weight of the device. The bottom plate 100 can be provided with a group of threaded holes 130 for connecting the first fixing component and the second fixing component. According to an exemplary embodiment of the present application, a measuring component 140 can also be provided on the bottom plate 100. The measuring component 140 is parallel to the shape memory alloy wire and is arranged on the bottom plate 100. The measuring device can measure the distance between the first sliding component and the second fixing component. On the one hand, before the shape memory alloy wire is compressed, the distance between the first sliding component and the second fixing component can be measured by the measuring device, thereby obtaining the length of the stretched shape memory alloy wire; on the other hand, after the shape memory alloy wire is compressed, the tensile strain can be accurately controlled by measuring the front and rear difference of the distance between the first sliding component and the second fixing component. By setting the measuring component, the tensile strain of the shape memory alloy wire can be accurately controlled.

[0070] According to some embodiments of the present application, the measuring component 140 may be a measuring ruler, connected to the base plate 100 through the bolt hole 150 or integrally formed with the base plate 100. According to other embodiments of the present application, the measuring component 140 may also be a set of scales set on the base plate 100, which is not limited by the present application.

[0071] Figure 5 A schematic diagram of a fixing component and a rotation adjustment component according to an exemplary embodiment of the present application is shown.

[0072] See also Figure 5, the first rotation adjustment component may include a threaded connecting rod 610 and a rotating hand wheel 630. A threaded hole is set at the geometric center of the first fixed component 200, and a center hole is set at the center of the first sliding component 400. One end of the threaded connecting rod 610 first passes through the threaded hole of the first fixed component 200, then passes through the center hole of the first sliding component 400, and is connected to the first sliding component 400 through a metal gasket 640 and a metal gasket and an E-shaped buckle 650. The rotating hand wheel 630 is set at the other end of the threaded connecting rod 610, and the first sliding component 400 is driven to slide along the guide component 500 by rotating the rotating hand wheel 620. According to some embodiments of the present application, the rotating hand wheel 630 may be an aluminum alloy hand wheel.

[0073] According to other embodiments of the present application, the first rotation adjustment component may further include an embossed knob 620. The embossed knob 620 is disposed between the rotating hand wheel 630 and the first fixed component 200, and is connected to the threaded connecting rod 610 through a thread. After the first sliding component 400 slides to a predetermined position through the threaded connecting rod 610, the embossed knob 620 is rotated to be in close contact with the first fixed component 200, thereby limiting the threaded connecting rod 610, and then locking the position of the first sliding component 400, so that the stretched state of the shape memory alloy wire is maintained. Figure 6 A schematic diagram of a sliding component according to an exemplary embodiment of the present application is shown.

[0074] See also Figure 6 , the first sliding component 400 includes a sliding block 410, a clamping structure 420, and an oil-free bushing 430. Through holes are set on the left and right sides of the sliding block 410, and the guide component 500 passes through the through holes on both sides of the sliding block 430 through the oil-free bushing 430, thereby forming a sliding component that can slide more smoothly. Through holes are set on both sides of the first fixed component 200, and the guide component 500 passes through the through holes on both sides of the first fixed component 200 of the steel plate 21 and is installed and positioned by the hexagon socket set screws. The clamping structure 420 is clamped and connected to the sliding block 410 through the threaded hole, and the shape memory alloy wire is clamped during the stretching process. A center hole is set on the sliding block 410, and the threaded connecting rod 610 passes through the center hole of the sliding block 410 and is fixed by a metal gasket and an E-shaped buckle 650.

[0075] Figure 7 A front view of a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application is shown; Figure 8 A top view of a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application is shown; Fig. 9 A perspective view of a device for shape memory alloy wire tensile testing according to a second exemplary embodiment of the present application is shown.

[0076] See also Figure 7-Figure 9According to a second exemplary embodiment of the present application, a device 2000 for a shape memory alloy wire tensile test includes a base plate 100, a first fixing component 200, a second fixing component 300, a first sliding component 400, a second sliding component 700, a guide component 500, a first rotation adjustment component 600, and a second rotation adjustment component 800.

[0077] The first fixing member 200 and the second fixing member 300 may have the same structure and are relatively arranged at the two ends of the bottom plate 100, for example, symmetrically arranged on the left and right sides of the bottom plate 100. The first sliding member 400 and the second sliding member 700 have symmetrical structures. The second sliding member 700 is arranged opposite to the first sliding member 400, and is slidably connected between the first fixing member 200 and the second fixing member 300 through the guide member 500 to press the shape memory alloy wire 10. The distance between the first sliding member 400 and the second sliding member 700 is adjustable, so that the length range of the stretched shape memory alloy wire 10 can be adjusted.

[0078] The first rotation adjustment component 600 connects the first fixed component 200 and the first sliding component 400. The second rotation adjustment component 800 connects the second fixed component 300 and the second sliding component 700. By rotating the first rotation adjustment component 600, the first sliding component 400 can be driven to slide along the guide component 500, and by rotating the second rotation adjustment component 800, the second sliding component 700 can be driven to slide along the guide component 500. A set of anchoring components are correspondingly arranged on the first fixed component 200 and the second fixed component 300 (see Figure 2 and Figure 3 ), used to anchor a set of shape memory alloy wires 10 passing through the device 2000.

[0079] After a group of shape memory alloy wires 10 are anchored on the device 2000, the distance between the first sliding component 400 and the second sliding component 700 is adjusted, and the group of shape memory alloy wires 10 are compressed by the compression structures on the first sliding component 400 and the second sliding component 700. After the shape memory alloy wires 10 are compressed by the first sliding component 400 and the second sliding component 700, the first rotation adjustment component 600 can be rotated alone to drive the first sliding component 400 to slide along the guide component 500, or the second rotation adjustment component 800 can be rotated alone to drive the second sliding component 700 to slide along the guide component 500, or the first rotation adjustment component 600 and the second rotation adjustment component 800 can be rotated at the same time to drive the first sliding component 400 and the second sliding component 700 to slide along the guide component 500 at the same time, thereby meeting different stretching requirements of the shape memory alloy wires 10.

[0080] According to a preferred embodiment of the present application, the guide component 500 can be provided with two guide shafts, namely a first guide shaft and a second guide shaft. The first guide shaft corresponds to one end connecting the first fixing component 200 and the second fixing component 300. The second guide shaft corresponds to the other end connecting the first fixing component 200 and the second fixing component 300. By providing two guide shafts, the stable sliding of the first sliding component 400 can be further ensured, thereby ensuring the uniform stretching of the shape memory alloy wire 10.

[0081] The second rotation adjustment member 800 has the same structure as the first sliding member 400 (see Figure 5 ), the second sliding member 700 is symmetrical with the first sliding member 400 (see Figure 6 ), this application will not be repeated here.

[0082] Similarly, a measuring component 140 can also be provided on the bottom plate 100. The measuring component 140 is parallel to the shape memory alloy wire and is provided on the bottom plate 100. The measuring device can measure the distance between the first sliding component and the second fixed component. On the one hand, before the shape memory alloy wire is compressed, the distance between the first sliding component and the second fixed component can be measured by the measuring device to obtain the length of the stretched shape memory alloy wire; on the other hand, after the shape memory alloy wire is compressed, the tensile strain can be accurately controlled by measuring the difference between the distance between the first sliding component and the second fixed component. By providing the measuring component, the tensile strain of the shape memory alloy wire can be accurately controlled.

[0083] On the basis of the first exemplary embodiment, the device 2000 according to the second exemplary embodiment further provides two sliding components and two rotating adjustment components so that the force is applied evenly throughout the stretching process of the shape memory alloy wire. By adjusting the distance between the two sliding components, the stretching length range of the shape memory alloy wire is controlled. The maximum stretching length according to the second exemplary embodiment of the present application is as follows: Fig.10 As shown; the minimum stretching length according to the second exemplary embodiment of the present application is as shown Fig.11 shown.

[0084] Fig.12 A flow chart of a method for tensile testing of a shape memory alloy wire according to a first exemplary embodiment of the present application is shown.

[0085] According to another aspect of the present application, there is also provided a method for using Figure 1 The apparatus 1000 shown in the figure is used to perform a tensile test on a shape memory alloy wire.

[0086] In step S110 , the shape memory alloy wire 10 is passed through the first fixing member 200 , the first sliding member 400 , and the second fixing member 300 in sequence.

[0087] The first fixing member 200 and the second fixing member 300 form a symmetrical structure. A first space is formed between the first fixing member 200 and the first sliding member 400; and a second space is formed between the first sliding member 400 and the second fixing member 300.

[0088] The shape memory alloy wire can be cut into a suitable length before the test. The shape memory alloy wire passes through the anchor hole on the first fixing component 200, passes through the first space and the second space, and then passes through the anchor hole on the second fixing component 300.

[0089] In step S120, the shape memory alloy wire 10 is anchored by the first fixing member 200 and the second fixing member 300. The anchor plug on the first fixing member 200 is installed in the corresponding anchor hole, and the anchor plug on the second fixing member 300 is also installed in the corresponding anchor hole. Thus, the shape memory alloy wire is anchored by the first fixing member and the second fixing member.

[0090] In step S130, the position of the first sliding member 400 is adjusted along the guide member 500 and the shape memory alloy wire 10 is compressed. Before the shape memory alloy wire 10 is compressed, the distance of the first sliding member 400 along the guide member can be adjusted to adjust the length range of the shape memory alloy wire stretching. At this time, the stretched shape memory alloy wire is the shape memory alloy wire in the second space. By stretching the shape memory alloy wire after compression, the preset strain amount can be accurately obtained.

[0091] After the stretching range is determined, the shape memory alloy wire can be compressed by the compression structure on the first sliding component 400. For example, the compression structure and the sliding block are tightened by bolts, thereby compressing the shape memory alloy wire so that the shape memory alloy wire does not slip. According to some embodiments of the present application, in order to further avoid slippage, sandpaper can also be placed between the compression structure and the sliding block.

[0092] In step S140, the first rotation adjustment component 600 is rotated to drive the first sliding component 400 to slide along the guide component 500, thereby stretching the shape memory alloy wire. For example, the rotation of the aluminum alloy hand wheel drives the connecting threaded rod to rotate, and then drives the sliding block to slide left and right on the guide component, thereby adjusting the tensile strain. According to some embodiments of the present application, a measuring device can also be set on the bottom plate 100, and the tensile parameters can be accurately controlled by the measuring device.

[0093] Fig.13 A flow chart of a method for tensile testing of a shape memory alloy wire according to a second exemplary embodiment of the present application is shown.

[0094] According to another aspect of the present application, there is also provided a method for using Figure 7The method of performing a tensile test of a shape memory alloy wire using the apparatus 2000 shown in FIG. Fig.13 , the method comprises the following steps.

[0095] In step S210 , the shape memory alloy wire 10 is passed through the first fixing member 200 , the first sliding member 400 , the second sliding member 700 , and the second fixing member 300 in sequence.

[0096] The first fixing member 200 and the second fixing member 300, the first sliding member 400 and the second sliding member 700 form a symmetrical structure. A first space is formed between the first fixing member 200 and the first sliding member 400; a second space is formed between the first sliding member 400 and the second sliding member 700; and a third space is formed between the second sliding member 700 and the second fixing member 300.

[0097] The shape memory alloy wire can be cut into a suitable length before the test. The shape memory alloy wire passes through the anchor hole on the first fixing component 200 , passes through the first space, the second space and the third space, and then passes through the anchor hole on the second fixing component 300 .

[0098] In step S210, the shape memory alloy wire 10 is anchored by the first fixing member 200 and the second fixing member 300. The anchor plug on the first fixing member 200 is installed in the corresponding anchor hole, and the anchor plug on the second fixing member 300 is installed in the corresponding anchor hole. Thus, the shape memory alloy wire is anchored by the first fixing member and the second fixing member.

[0099] In step S230, the distance between the first sliding member 400 and the second sliding member 700 is adjusted along the guide member 500 and the shape memory alloy wire 10 is compressed. Before the shape memory alloy wire 10 is compressed, the distance between the first sliding member 400 and the second sliding member 700 can be adjusted to adjust the length range of the shape memory alloy wire stretching. At this time, the stretched shape memory alloy wire is the shape memory alloy wire in the second space. After compression, the shape memory alloy wire can be stretched to accurately obtain the preset strain amount.

[0100] After the stretching range is determined, the shape memory alloy wire can be compressed by the compression structures on the first sliding component 400 and the second sliding component 700. For example, the two compression structures are tightened with the sliding block by bolts to compress the shape memory alloy wire so that the shape memory alloy wire does not slip. According to some embodiments of the present application, in order to further avoid slippage, sandpaper can also be placed between the compression structure and the sliding block.

[0101] In step S240, the first rotation adjustment component 600 and / or the second rotation adjustment component 800 are rotated to respectively drive the first sliding component 400 and the second sliding component 700 to slide along the guide component 500, thereby stretching the shape memory alloy wire.

[0102] For example, the rotation of the aluminum alloy handwheels on both sides drives the connecting threaded rod to rotate, thereby driving the sliding block to slide left and right on the guide component, thereby adjusting the tensile strain. According to some embodiments of the present application, a measuring device can also be set on the bottom plate 100, and the tensile parameters can be accurately controlled by the measuring device.

[0103] The device for shape memory alloy wire tensile testing provided in the present application can stretch multiple shape memory alloy wire bundles at the same time; by adjusting the position of the sliding component before pressing, the length of the shape memory alloy wire to be stretched can be adjusted over a large range; the measuring device can accurately ensure the tensile strain of the shape memory alloy wire and the shrinkage of the shape memory alloy wire; the rotating adjustment component cooperates with the guide component to easily achieve stretching, and has a simple structure, easy operation, and controllable applied stress and strain.

[0104] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A device for tensile testing of shape memory alloy wire, comprising: Base plate; A first fixing component and a second fixing component are arranged at two ends of the bottom plate opposite to each other; A set of anchoring components is correspondingly arranged on the first fixing component and the second fixing component, for anchoring the shape memory alloy wire, wherein the anchoring components include: Anchor holes; and An anchor plug, cooperating with the anchor hole, anchoring the shape memory alloy wire passing through the central hole of the anchor plug; The first sliding component is slidably connected between the first fixed component and the second fixed component through a guide component, and the shape memory alloy wire is pressed by a pressing structure arranged thereon, wherein the guide component is connected to the first sliding component through an oil-free bushing, and the guide component includes: A first guide shaft, corresponding to one end connecting the first fixing component and the second fixing component; and A second guide shaft, corresponding to the other end connecting the first fixing component and the second fixing component; a first rotation adjustment component, connecting the first fixed component and the first sliding component, driving the first sliding component to slide along the guide component, thereby stretching the shape memory alloy wire; wherein the first rotation adjustment component includes: a threaded connecting rod, one end of which passes through the first fixing component and is connected to the first sliding component; a rotating hand wheel, disposed at the other end of the threaded connecting rod, and driving the first sliding component to slide along the guide component by rotating the rotating hand wheel; and An embossed knob, disposed between the rotating hand wheel and the first fixing component, and connected to the threaded connecting rod via a thread; The measuring component is parallel to the shape memory alloy wire and is arranged on the bottom plate; wherein the measuring component comprises a measuring ruler, and the measuring ruler is connected to or integrally formed with the bottom plate.

2. The device according to claim 1, characterized in that Also includes: a second sliding component, arranged opposite to the first sliding component, slidably connected between the first fixing component and the second fixing component through the guide component and pressing the shape memory alloy wire; a second rotation adjustment component, connecting the second fixing component and the second sliding component, and driving the second sliding component to slide along the guide component, thereby stretching the shape memory alloy wire; The distance between the first sliding component and the second sliding component is adjustable.

3. A method for performing a tensile test on a shape memory alloy wire using the device according to claim 1, comprising: Passing the shape memory alloy wire through the first fixing component, the first sliding component and the second fixing component in sequence; Anchoring the shape memory alloy wire by the first fixing member and the second fixing member; adjusting the position of the first sliding component along the guide component and pressing the shape memory alloy wire; The first rotation adjustment component is rotated to drive the first sliding component to slide along the guide component, thereby stretching the shape memory alloy wire.

4. A method for performing a tensile test on a shape memory alloy wire using the device according to claim 2, comprising: Passing the shape memory alloy wire through the first fixing component, the first sliding component, the second sliding component and the second fixing component in sequence; Anchoring the shape memory alloy wire by the first fixing member and the second fixing member; adjusting the distance between the first sliding component and the second sliding component along the guide component and pressing the shape memory alloy wire; The first rotation adjustment component and / or the second rotation adjustment component are rotated to respectively drive the first sliding component and the second sliding component to slide along the guide component, thereby stretching the shape memory alloy wire.

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