Strain applying device and bend radius determination method

Abstract

The application discloses a strain applying device and a bending radius determining method, and relates to the technical field of strain application. The device comprises a supporting piece, a first pushing piece, a second pushing piece, a driving assembly and a pressing assembly. The supporting piece is used for supporting a material. The first pushing piece and the second pushing piece are respectively located on the opposite sides of the supporting piece. The driving assembly is connected with the first pushing piece and the second pushing piece respectively. The driving assembly is used for driving the first pushing piece and the second pushing piece to move close to each other or move away from each other. The first pushing piece and the second pushing piece are used for making the material bend when moving close to each other. The pressing assembly is arranged above the supporting piece. The pressing assembly is used for applying pressure to the material at a preset height, so that the highest point of the material bending remains unchanged. Since the height of the material remains unchanged during the process of applying bending strain to the material, the microscope does not need to be refocused, the operation is simple, and the material can be prevented from directly contacting the objective lens of the microscope, so that the probability of damaging the objective lens is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of strain application, in particular to a strain application device and a bending radius determination method. BACKGROUND

[0002] For two-dimensional materials, the industry currently further controls and modulates the properties of two-dimensional materials by bending two-dimensional materials. Optical technology is one of the most commonly used characterization methods for characterizing strained two-dimensional materials, and is often used to study the strain, energy band structure, band gap, etc. of two-dimensional materials.

[0003] However, when the related art performs optical technology characterization on the bent two-dimensional material, the two-dimensional material deforms when it is bent, causing the height of the two-dimensional material to change, so that the light spot cannot be hit on the same position of the material, the microscope needs to be refocused, the operation is complex, and because the height of the two-dimensional material changes, the two-dimensional material can directly contact the objective lens of the microscope, causing damage to the objective lens. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a strain application device and a bending radius determination method, which can apply bending strain to the material and keep the height of the material unchanged during the bending strain application process.

[0005] In a first aspect, an embodiment of the present application provides a strain application device, comprising:

[0006] a support member for supporting a material;

[0007] a first pushing member;

[0008] a second pushing member, the first pushing member and the second pushing member being respectively located on opposite sides of the support member; the opposite sides of the first pushing member and the second pushing member are both provided as circular arc surfaces;

[0009] a driving assembly, the driving assembly being connected with the first pushing member and the second pushing member respectively, the driving assembly being used to drive the first pushing member and the second pushing member to move closer to each other or farther away from each other, and the first pushing member and the second pushing member being used to bend the material when moving closer to each other;

[0010] a pressing assembly, the pressing assembly being provided above the support member, the pressing assembly being used to apply pressure to the material at a preset height, so as to keep the highest point of the bent material unchanged.

[0011] The strain applying device according to the first aspect of the present application has at least the following beneficial effects: the strain applying device according to the embodiments of the present application comprises a support, a first pushing piece, a second pushing piece, a driving assembly and a pressing assembly. The support is used for supporting a material. The first pushing piece and the second pushing piece are respectively located on opposite sides of the support, and the opposite sides of the first pushing piece and the second pushing piece are both provided as arc surfaces. The driving assembly is connected with the first pushing piece and the second pushing piece respectively, and is used for driving the first pushing piece and the second pushing piece to move closer to each other or move away from each other. The first pushing piece and the second pushing piece are used for bending the material when moving closer to each other. The pressing assembly is arranged above the support, and is used for applying pressure to the material at a preset height, so as to keep the highest point of the bent material unchanged. When the strain applying device according to the embodiments of the present application is used, the material is placed on the support, and the pressing assembly is used to press the material. The driving assembly drives the first pushing piece and the second pushing piece to move closer to each other, so that the first pushing piece and the second pushing piece contact the material and apply bending strain to the material, so that the material is bent. The pressing assembly is used for applying pressure to the material at a preset height, so as to keep the highest point of the bent material unchanged. When the material is characterized by optical technology, the height of the material remains unchanged during the process of applying bending strain to the material. Therefore, the microscope does not need to be refocused, the operation is simple, and the material can be prevented from directly contacting the objective lens of the microscope, so as to reduce the probability of damaging the objective lens.

[0012] According to some embodiments of the first aspect of the present application, the first support and the second support are respectively mounted on opposite sides of the base. One end of the support is mounted on the first support, and the other end of the support is mounted on the second support.

[0013] According to some embodiments of the first aspect of the present application, the pressing assembly comprises a first pressing piece and a second pressing piece. The first pressing piece is detachably mounted on the first support, and the first pressing piece is located above one end of the support. The second pressing piece is detachably mounted on the second support, and the second pressing piece is located above the other end of the support. The first pressing piece and the second pressing piece are in the same horizontal plane.

[0014] According to some embodiments of the first aspect of the present application, the first support is provided with a first through hole, the second pressing piece is provided with a fourth through hole, and the second fastener is sequentially arranged in the fourth through hole and the third through hole, so as to fix the second pressing piece to the second support.

[0015] The second support is provided with a third through hole, the second pressing piece is provided with a fourth through hole, and the second fastener is sequentially arranged in the fourth through hole and the third through hole, so as to fix the second pressing piece to the second support.

[0016] According to some embodiments of the first aspect of the present application, the driving assembly comprises a bidirectional screw rod, a driving member, a first sliding block and a second sliding block. The driving member is mounted on the base, and the driving member is connected with the bidirectional screw rod. The bidirectional screw rod is located between the support and the base. The first sliding block and the second sliding block are respectively slidably arranged at opposite ends of the bidirectional screw rod, and the first sliding block and the second sliding block are respectively located at opposite sides of the support. The first pushing member is mounted on the first sliding block, and the second pushing member is mounted on the second sliding block. The driving member is used to drive the bidirectional screw rod to rotate, so that the first sliding block and the second sliding block are close to or away from each other.

[0017] According to some embodiments of the first aspect of the present application, the driving assembly further comprises a first fixed block and a second fixed block. The first fixed block and the second fixed block are respectively mounted at opposite ends of the base. One end of the bidirectional screw rod is arranged through the first fixed block, and the other end is arranged through the second fixed block.

[0018] According to some embodiments of the first aspect of the present application, the driving assembly further comprises a guide column. The guide column is arranged through the first fixed block, the first sliding block, the second sliding block and the second fixed block in sequence.

[0019] According to some embodiments of the first aspect of the present application, the end surface of the support is a circular arc surface.

[0020] In the second aspect, the embodiments of the present application provide a bending radius determination method, which is applied to the strain applying device as described in any one of the embodiments of the first aspect. The method comprises the following steps:

[0021] Placing a material on a flexible substrate;

[0022] Placing the flexible substrate on the support, and pressing the material by the pressing assembly. The highest point of the material bending is determined by the pressing assembly;

[0023] Starting the driving assembly, and driving the first pushing member and the second pushing member to approach each other, so that the material generates uniform bending strain. The distance from the first pushing member to the center of the material is a first distance, and the distance from the second pushing member to the center of the material is a first distance.

[0024] Obtaining the bending radius of the material according to the first distance.

[0025] According to some embodiments of the present application, the radius of the circular arc surface of the first pushing member is equal to the radius of the circular arc surface of the second pushing member.

[0026] The step of obtaining the bending radius of the material according to the first distance comprises the following steps:

[0027] According to the first distance, a first formula is used to obtain a bending radius of the material; the first formula is:

[0028]

[0029] Wherein, d is the first distance; R is the bending radius; t is the thickness of the material, and r is the radius of the circular surface of the first pushing piece.

[0030] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present application will be further described below in conjunction with the accompanying drawings and embodiments, wherein:

[0032] Figure 1 A structural schematic diagram of a strain applying device according to an embodiment of the present application;

[0033] Figure 2 A structural schematic diagram of a strain applying device according to an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a material being subjected to bending strain by a strain applying device according to an embodiment of the present application;

[0035] Figure 4 A side view schematic diagram of a material being bent into a perfect circular arc according to an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the relationship between the bending radius and the first distance when a single-layer molybdenum disulfide film is subjected to bending strain by a strain applying device according to an embodiment of the present application;

[0037] Figure 6 Raman spectra of a single-layer molybdenum disulfide film under different bending strains of a flexible substrate;

[0038] Figure 7 A flowchart of a bending radius determination method according to an embodiment of the present application.

[0039] The accompanying drawings are provided to further describe the present application, and the specific implementation manners of the present application will be described in detail in connection with the accompanying drawings. In the drawings: DETAILED DESCRIPTION

[0040] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0041] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0042] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0043] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0044] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0045] As the most typical transition metal sulfide compound, molybdenum disulfide has good thermal stability and chemical stability, high mechanical strength, great flexibility, high transparency, and ultra-high carrier mobility. And the single-layer molybdenum disulfide is a direct band gap semiconductor, which has extremely superior optoelectronic properties and ultra-high device switching ratio, and becomes an ideal material for constructing the next generation of lighter, thinner, faster and more sensitive electronic and optoelectronic flexible devices.

[0046] For molybdenum disulfide film, the industry currently further controls and modulates the properties of molybdenum disulfide by mechanical methods, and optical technology is one of the most commonly used characterization methods for characterizing strained molybdenum disulfide film, and is often used to study the strain, energy band structure, band gap and the like of molybdenum disulfide. Various optical technologies are used for material characterization, one of the key technologies is Raman spectroscopy, which provides a lot of information about two-dimensional heterostructures and interactions. However, in related technologies, it is very difficult to use Raman spectroscopy to characterize curved molybdenum disulfide film, because when the material is subjected to bending strain, the deformation of the material changes its vertical position, that is, the height of the material changes, so that when Raman spectroscopy is performed, the light spot cannot be on the same position of the material, resulting in the need for the microscope to refocus, which is complex to operate, and because the height of the two-dimensional material changes, the two-dimensional material may directly contact the objective lens of the microscope, causing damage to the objective lens. Based on this, the embodiment of the application provides a strain applying device and a bending radius determination method, which can apply bending strain to the material, and keep the height of the material unchanged during the process of applying bending strain to the material.

[0047] In a first aspect, with reference to Figures 1 to 3 The embodiment of the application provides a strain applying device, which comprises:

[0048] The support 110 is used for supporting the material;

[0049] The first pushing piece 121;

[0050] The second pushing piece 131, the first pushing piece 121 and the second pushing piece 131 are located on opposite sides of the support 110 respectively; the opposite sides of the first pushing piece 121 and the second pushing piece 131 are both provided as arc surfaces;

[0051] The driving assembly is connected with the first pushing piece 121 and the second pushing piece 131 respectively, and is used for driving the first pushing piece 121 and the second pushing piece 131 to move close to each other or move away from each other, and the first pushing piece 121 and the second pushing piece 131 are used for bending the material when moving close to each other;

[0052] The pressing assembly is arranged above the support 110, and is used for applying pressure to the material at a preset height, so that the highest point of the bent material remains unchanged.

[0053] In the strain applying device, the material is placed on the support, and the compression assembly compresses the material, and the driving assembly drives the first pushing piece 121 and the second pushing piece 131 to move close to each other, so that the first pushing piece 121 and the second pushing piece 131 are in contact with the material and apply bending strain to the material, so that the material is bent, and the pressure is applied to the material at the preset height, so that the highest point of the bent material remains unchanged. When the material is characterized by an optical technique, the height of the material remains unchanged during the bending strain application process, so the microscope does not need to be refocused, the operation is simple, and the material can be prevented from directly contacting the objective lens of the microscope, thereby reducing the probability of damaging the objective lens.

[0054] It should be noted that the preset height is not limited in the embodiments of the present application, and the preset height can be set according to actual needs by those skilled in the art.

[0055] It should be noted that in the strain applying device, the material is placed on the flexible substrate, and then the flexible substrate is placed on the support 110, and the compression assembly is used to compress the flexible substrate, one side of the flexible substrate provided with the material faces upward, so that the compression assembly is in contact with the material, so that the material is kept between the compression assembly and the support 110.

[0056] It should be noted that the material described in the above embodiments includes but is not limited to two-dimensional material, which can be a molybdenum disulfide film or other materials, and the embodiments of the present application do not limit this.

[0057] It can be understood that the strain applying device of the embodiments of the present application further comprises a base 100 and a first support 140 and a second support 150, the first support 140 and the second support 150 are respectively installed on the opposite sides of the base 100, one end of the support 110 is installed on the first support 140, and the other end of the support 110 is installed on the second support 150.

[0058] It can be understood that the compression assembly comprises a first pressing plate 141 and a second pressing plate 151, the first pressing plate 141 is detachably installed on the first support 140 and located above one end of the support 110, and the second pressing plate 151 is detachably installed on the second support 150 and located above the other end of the support 110. In some embodiments, the first pressing plate 141 and the second pressing plate 151 are in the same horizontal plane, that is, the height of the first pressing plate 141 and the height of the second pressing plate 151 are the same, and the preset height is the height of the first pressing plate 141. In use of the strain applying device, the material is placed on the flexible substrate, and then the flexible substrate is placed on the support 110, and the side of the flexible substrate provided with the material faces upward, so that the first pressing plate 141 compresses the material, and the second pressing plate 151 compresses the material, so that the material is kept between the first pressing plate 141 and the support 110, so that the height of the material remains unchanged during the bending of the material. After use, the first pressing plate 141 is removed from the first support 140, and the second pressing plate 151 is removed from the second support 150, so that the material can be taken out.

[0059] It can be understood that the strain applying device further comprises a first fastener and a second fastener, the first support 140 is provided with a first through hole, the first pressing plate 141 is provided with a second through hole, the first fastener is sequentially arranged in the second through hole and the first through hole to fix the first pressing plate 141 on the first support 140; the second support 150 is provided with a third through hole, the second pressing plate 151 is provided with a fourth through hole, and the second fastener is sequentially arranged in the fourth through hole and the third through hole to fix the second pressing plate 151 on the second support 150.

[0060] The first fastener and the second fastener can be bolts, the first pressing plate 141 can be fixed on the first support 140 by sequentially arranging the first fastener in the second through hole and the first through hole, and the first pressing plate 141 can be used to compress the material on the support 110 because the first pressing plate 141 is located above the support 110; the second pressing plate 151 can be fixed on the second support 150 by sequentially arranging the second fastener in the fourth through hole and the third through hole, and the second pressing plate 151 can be used to compress the material on the support 110 because the second pressing plate 151 is located above the support 110.

[0061] It can be understood that the driving assembly comprises the bidirectional screw rod 170, the driving member 160, the first sliding block 120 and the second sliding block 130, the driving member 160 is installed on the base 100, the driving member 160 is connected with the bidirectional screw rod 170, the bidirectional screw rod 170 is located between the support 110 and the base 100, the first sliding block 120 and the second sliding block 130 are respectively slidably arranged at opposite ends of the bidirectional screw rod 170, and the first sliding block 120 and the second sliding block 130 are respectively located at opposite sides of the support 110, the first pushing member 121 is installed on the first sliding block 120, the second pushing member 131 is installed on the second sliding block 130, and the driving member 160 is used for driving the bidirectional screw rod 170 to rotate, so that the first sliding block 120 and the second sliding block 130 are close to or away from each other.

[0062] It is worth noting that the base 100 is in the shape of a rectangle, the driving member 160 is a driving motor, the driving motor is installed at one end of the base 100, the driving motor is connected with the bidirectional screw rod 170, the support 110 and the base 100 have a gap therebetween, the bidirectional screw rod 170 is arranged in the gap between the support 110 and the base 100, the first sliding block 120 and the second sliding block 130 are respectively slidably arranged at opposite ends of the bidirectional screw rod 170, and the first sliding block 120 and the second sliding block 130 are respectively located at opposite sides of the support 110. When the driving motor is started, the bidirectional screw rod 170 can be driven to rotate, the rotation of the bidirectional screw rod 170 can drive the first sliding block 120 and the second sliding block 130 to slide along the bidirectional screw rod 170, and the first sliding block 120 and the second sliding block 130 are close to or away from each other, and since the first pushing member 121 is installed on the first sliding block 120 and the second pushing member 131 is installed on the second sliding block 130, the first sliding block 120 and the second sliding block 130 can drive the first pushing member 121 and the second pushing member 131 to be close to or away from each other, when the first pushing member 121 and the second pushing member 131 are close to each other, the first pushing member 121 is close to the support 110, the second pushing member 131 is also close to the support 110, and the first pushing member 121 and the second pushing member 131 can contact the material on the support 110, so as to apply a bending strain to the material and make the material bend, and at this time, the first pushing member 121 and the second pushing member 131 are tangent to the material, and the first pushing member 121 and the second pushing member 131 are symmetrical.

[0063] It can be understood that the strain applying device of the embodiment of the application further comprises the first fixed block 180 and the second fixed block 190, the first fixed block 180 and the second fixed block 190 are respectively installed at opposite ends of the base 100, one end of the bidirectional screw rod 170 is arranged in the first fixed block 180, and the other end is arranged in the second fixed block 190.

[0064] It can be understood that the strain applying device of the embodiment of the present application further comprises a guide column 200, which is sequentially arranged in the first fixed block 180, the first sliding block 120, the second sliding block 130 and the second fixed block 190. The guide column 200 is parallel to the bidirectional screw rod 170, and when the first sliding block 120 and the second sliding block 130 slide, the guide column 200 can play a guiding role, so that the first sliding block 120 and the second sliding block 130 can move smoothly. It should be noted that the number of the guide column 200 is not limited in the embodiment of the present application, and the number of the guide column 200 can be set according to actual needs by those skilled in the art, for example, the guide column 200 can be set to 2, and the two guide columns 200 are respectively located on the opposite sides of the bidirectional screw rod 170.

[0065] It can be understood that the end surface of the support 110 is a circular arc surface.

[0066] It can be understood that one side of the first pushing piece 121 opposite to the second pushing piece 131 is a circular arc surface, and one side of the second pushing piece 131 opposite to the first pushing piece 121 is a circular arc surface.

[0067] The second aspect embodiment of the present application further provides a bending radius determination method, which can be applied to the strain applying device of the first aspect embodiment, and the method comprises the following steps: Figure 7 , but is not limited to the following steps:

[0068] Step S100, placing the material on the flexible substrate;

[0069] Step S200, placing the flexible substrate on the support, and pressing the flexible substrate by the pressing assembly, and determining the highest point of the material bending by the pressing assembly;

[0070] Step S300, starting the driving assembly, driving the first pushing piece and the second pushing piece to approach each other, so that the material generates uniform bending strain; wherein the distance from the first pushing piece to the center of the material is a first distance, and the distance from the second pushing piece to the center of the material is a first distance;

[0071] Step S400, obtaining the bending radius of the material according to the first distance.

[0072] In some embodiments, the radius of the circular arc surface of the first pushing piece 121 is equal to the radius of the circular arc surface of the second pushing piece 131;

[0073] Step S400 comprises the following steps:

[0074] According to the first distance and the first formula, the bending radius of the material is obtained, and the first formula is:

[0075]

[0076] Wherein, d is the first distance; R is the bending radius; t is the thickness of the material, and r is the radius of the circular arc surface part of the first pushing piece.

[0077] It can be understood that the end surface of the support 110 is a circular arc surface, one side of the first pushing piece 121 opposite to the second pushing piece 131 is a circular arc surface; one side of the second pushing piece 131 opposite to the first pushing piece 121 is a circular arc surface, the first pushing piece 121 and the second pushing piece 131 are structurally identical, and the radius of the circular arc surface of the first pushing piece 121 is equal to the radius of the circular arc surface of the second pushing piece 131. The circular arc surface of the first pushing piece 121 is a 180° circular arc, and is composed of two 90° circular arcs, one of which is the upper half of a semicircular arc, and the other of which is the lower half of a semicircular arc, and the upper half of the semicircular arc of the first pushing piece 121 is hidden, and only the lower half of the semicircular arc contacts the material. Figure 3 and Figure 4 In the example shown, Figure 3 the upper half of the semicircular arc of the first pushing piece 121 is hidden, and only the lower half of the semicircular arc contacts the material. The circular arc surface of the second pushing piece 131 is a 180° circular arc, and is composed of two 90° circular arcs, one of which is the upper half of a semicircular arc, and the other of which is the lower half of a semicircular arc, and the upper half of the semicircular arc of the second pushing piece 131 is hidden, and only the lower half of the semicircular arc contacts the material. Figure 3 In the example shown, Figure 3 the upper half of the semicircular arc of the second pushing piece 131 is hidden, and only the lower half of the semicircular arc contacts the material. The lower half of the circular arc of the first pushing piece 121 and the lower half of the semicircular arc of the second pushing piece 131 are at the same horizontal plane as the highest point of the circular arc surface of the support 110. Referring to Figure 3 and Figure 4 , Figure 3 a schematic view of the bending of the material by the strain applying device, Figure 4 a schematic view of the bending of the material into a positive circular arc. In Figure 4 , the material is bent into a positive circular arc. Wherein, d is the distance from the first pushing piece 121 to the center of the material, r is the radius of the circular arc surface part of the first pushing piece 121, t is the thickness of the material, the first pushing piece 121 is tangent to the material, the tangent point is the first tangent point, H is the vertical distance between the first tangent point and the highest point of the circular arc surface of the support 110; h is the vertical distance between the first tangent point and the lowest point of the circular arc surface of the first pushing piece 121; L is the horizontal distance between the first tangent point and the center of the material; l is the horizontal distance between the first tangent point and the center of the circular arc surface of the first pushing piece 121; R is the bending radius of the lower surface of the material, and R+t is the bending radius of the upper surface of the material.

[0078] Referring to Figure 4 , it can be seen from the schematic view that H+h=r; l+L=r+d; Figure 4

[0079] Figure 4 ​The triangle A and the triangle B in the figure are right triangles, and the triangle A is similar to the triangle B, so the following equation can be obtained.

[0080]

[0081] (R+t) 2 =(R-H) 2 +L 2 ;

[0082] According to the above equation, the first formula can be obtained, and the first formula is as follows:

[0083]

[0084] According to the first formula, the bending radius R of the lower surface of the material can be determined, and in some embodiments, t can be ignored, i.e., t=0, and R can be taken as the bending radius of the material. According to the first formula, the calculation formula of R is as follows:

[0085]

[0086] In some embodiments, the material is a single-layer molybdenum disulfide film, and r is set to 4, so that Referring to Figure 5 , Figure 5 FIG. 4 shows the relationship between R and d when the device of the present application is used to apply bending strain to the single-layer molybdenum disulfide film when r is 4. Referring to Figure 6 , Figure 6 is the Raman spectrum of the single-layer molybdenum disulfide film under different bending strains of the flexible substrate. It should be noted that the material is a single-layer molybdenum disulfide film, which is only an example and cannot be understood as a limitation of the embodiments of the present application. By using the bending radius determination method of the present application, the material can be applied to bending strain, and the height of the material remains unchanged during the application of bending strain to the material, and the bending radius of the material can be measured, which is convenient for optical characterization of the material to facilitate the study of the material. It should be noted that when the material is applied to bending strain, the material and the flexible substrate are bent at the same time.

[0087] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A strain applying device, characterized by, The utility model provides a material bending device, including: Supporting piece for supporting material; First push piece; Second push piece, the first push piece and the second push piece are located on the opposite sides of the supporting piece respectively, and the opposite sides of the first push piece and the second push piece are provided as circular arc surface; Driving assembly, the driving assembly is connected with the first push piece, the second push piece respectively, the driving assembly is used to drive the first push piece, the second push piece is close to each other or is far away from each other, and the first push piece and the second push piece are used to make the material bend when close to each other; Compression assembly, the compression assembly is located above the supporting piece, and the compression assembly is used to apply pressure to the material at a preset height to keep the highest point of the material bending unchanged; It also includes a base and a first support and a second support, the first support and the second support are respectively installed on the opposite sides of the base, one end of the supporting piece is installed on the first support, and the other end of the supporting piece is installed on the second support; The compression assembly includes a first pressing piece and a second pressing piece, the first pressing piece is detachably installed on the first support, and the first pressing piece is located above one end of the supporting piece, the second pressing piece is detachably installed on the second support, and the second pressing piece is located above the other end of the supporting piece, and the first pressing piece and the second pressing piece are in the same horizontal plane; The end surface of the supporting piece is a circular arc surface, the semicircular arc of the lower half of the first push piece, the semicircular arc of the lower half of the second push piece and the highest point of the circular arc surface of the supporting piece are in the same horizontal plane.

2. The strain applying apparatus according to claim 1, characterized by It also includes a first fastener and a second fastener, the first support is provided with a first through hole, the first pressing piece is provided with a second through hole, the first fastener is sequentially provided in the second through hole and the first through hole to fix the first pressing piece to the first support; The second support is provided with a third through hole, the second pressing piece is provided with a fourth through hole, and the second fastener is sequentially provided in the fourth through hole and the third through hole to fix the second pressing piece to the second support.

3. The strain applying apparatus according to claim 2, characterized by The driving assembly includes a bidirectional screw rod, a driving piece, a first sliding block and a second sliding block, the driving piece is installed on the base, the driving piece is connected with the bidirectional screw rod, the bidirectional screw rod is located between the supporting piece and the base, the first sliding block and the second sliding block are respectively slidably provided in the opposite ends of the bidirectional screw rod, and the first sliding block and the second sliding block are respectively located on the opposite sides of the supporting piece, the first push piece is installed on the first sliding block, the second push piece is installed on the second sliding block, and the driving piece is used to drive the bidirectional screw rod to rotate to make the first sliding block and the second sliding block close to each other or far away from each other.

4. The strain applying apparatus according to claim 3, characterized by It also includes a first fixed block and a second fixed block, the first fixed block and the second fixed block are respectively installed on the opposite ends of the base, one end of the bidirectional screw rod is provided in the first fixed block, and the other end is provided in the second fixed block.

5. The strain applying apparatus according to claim 4, characterized by It also includes a guide column, the guide column is sequentially provided in the first fixed block, the first sliding block, the second sliding block and the second fixed block.

6. A bend radius determination method characterized by, The method is applied to the strain applying device as claimed in claim 5, and the method comprises: placing a material on a flexible substrate; placing the flexible substrate on the support and pressing the flexible substrate by the pressing assembly, and determining the highest bending point of the material by the pressing assembly; starting the driving assembly to drive the first pushing member and the second pushing member to approach each other, so that the material generates uniform bending strain; wherein the distance from the first pushing member to the center of the material is a first distance, and the distance from the second pushing member to the center of the material is a first distance; obtaining the bending radius of the material according to the first distance.

7. The bend radius determination method of claim 6, wherein, the radius of the arc surface of the first pushing member is equal to the radius of the arc surface of the second pushing member; the obtaining of the bending radius of the material according to the first distance comprises: obtaining the bending radius of the material according to the first distance and a first formula; the first formula is: ， wherein d is the first distance; R is the bending radius; t is the thickness of the material, and r is the radius of the arc surface of the first pushing member.

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