CN114509336A - Adjustable hard brittle material surface stress loading device - Google Patents
Adjustable hard brittle material surface stress loading device Download PDFInfo
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- CN114509336A CN114509336A CN202111617720.9A CN202111617720A CN114509336A CN 114509336 A CN114509336 A CN 114509336A CN 202111617720 A CN202111617720 A CN 202111617720A CN 114509336 A CN114509336 A CN 114509336A
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- brittle material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an adjustable hard and brittle material surface stress loading device which comprises an outer supporting seat, a fastening pressing plate, a lifting platform, an optical platform, 2 supporting seats and 2 inner supporting rods. The adjustable hard and brittle material surface stress loading device is simple in structure and easy to machine and manufacture, the stress state of the surface of a test piece can be changed only by adjusting the height of the lifting table, the stress value can be continuously changed, the adjustment range is flexible, and one clamp can be simultaneously suitable for various materials; stress loading is carried out in a four-point bending mode, the defect that tensile-compression deformation and thermal deformation are not easy to generate for hard and brittle materials such as silicon wafers and the like is overcome, uniform stress layers are generated in the middle section of the test piece, and measurement errors caused by detection positions are avoided.
Description
Technical Field
The invention belongs to the field of nondestructive testing, and particularly relates to an adjustable hard and brittle material surface stress loading device.
Background
The laser surface acoustic wave technology is taken as a representative, and the nondestructive testing technology of the processing stress of the surface layer of the part is gradually and widely applied due to the advantages of no damage to the workpiece, flexibility, rapidness and the like. In practical application, a test piece to be tested needs to have a stress with a rated size in the process of carrying out calibration analysis on surface wave characteristics of different materials propagating on surface layers under different stress states. Due to the consideration of the limitation of experimental space and the property of the hard and brittle material, the method is not suitable for stress loading by using a thermal deformation method and a tension-compression method, and a clamp tool for stress loading needs to be specially designed for a hard and brittle material test piece.
Disclosure of Invention
In view of this, the present invention provides an adjustable hard and brittle material surface stress loading device to solve the deficiencies of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides an adjustable hard brittle material surface stress loading device, includes outer support, tightly decides clamp plate, lift platform, optics platform, 2 supports and 2 inner support rods, 2 the support symmetry sets up, and both bottom fixed connection to optics platform, 2 be connected through 2 inner support rods between the support, 2 still be equipped with lift platform between the support, lift platform bottom fixed connection to optics platform, top fixed connection to outer support, outer support top is used for placing the test piece, outer support top one end still is connected to tightly decides the clamp plate, lift platform signal connection to controller.
Furthermore, the support is of a T-shaped structure, a first bolt hole is formed in each of two sides of the bottom of the support, a fixing hole is formed in each of the surfaces of the top of the support, and the support is fixedly connected to the inner support rod through the fixing holes.
Further, outer support seat is different in nature structure, and the arc recess has been seted up at outer support seat top, and arc recess one end is connected to tightly decides the clamp plate, and test piece one end joint is to tightly deciding the clamp plate bottom, and the test piece other end is installed to the arc recess other end, the both ends of arc recess form outer horizontal plane.
Further, 2 inner supporting rods are arranged in parallel, an inner horizontal plane is formed between the 2 inner supporting rods, and the inner horizontal plane and the outer horizontal plane are arranged in parallel.
Further, tightly decide the clamp plate and be the cuboid structure, tightly decide the clamp plate both ends and seted up a No. two bolt holes respectively, No. two bolt holes are used for fixed tightly deciding the clamp plate, tightly decide the clamp plate surface and can also seted up the locating hole, and the locating hole is used for the location test piece.
Furthermore, two sides of the lifting platform are respectively provided with a bolt plate, and the lifting platform is fixed to the optical platform through the bolt plates.
Compared with the prior art, the adjustable hard and brittle material surface stress loading device has the following advantages:
(1) the adjustable hard and brittle material surface stress loading device is simple in structure and easy to machine and manufacture, the stress state of the surface of a test piece can be changed only by adjusting the height of the lifting table, the stress value can be continuously changed, the adjustment range is flexible, and one clamp can be simultaneously suitable for various materials; stress loading is carried out in a four-point bending mode, the defect that tensile-compression deformation and thermal deformation are not easy to generate for hard and brittle materials such as silicon wafers and the like is overcome, uniform stress layers are generated in the middle section of the test piece, and measurement errors caused by detection positions are avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure according to the embodiment of the present invention;
fig. 2 is a schematic diagram of a shearing force and a bending moment in the loading process according to the embodiment of the invention.
Description of reference numerals:
1. a support; 2. an inner support bar; 3. an outer support base; 4. tightly fixing the pressing plate; 5. a test piece; 6. a lifting platform; 7. an optical platform.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The noun explains:
four-point bending test: the four-point bending test is a test method for measuring the bending performance of a material. The strip-shaped sample is flatly placed in a bending test fixture to form a simple beam form, the distance between two lower supporting points for supporting the sample is adjustable according to the length of the sample, and two symmetrical loading points are arranged above the sample.
As shown in fig. 1 to fig. 2, an adjustable hard and brittle material surface stress loading device includes an outer support base 3, a clamping pressing plate 4, a lifting platform 6, an optical platform 7, 2 support bases 1, 2 inner support rods 2, 2 support bases 1 are symmetrically arranged, the bottoms of the two support bases 1 are fixedly connected to the optical platform 7, 2 support bases 1 are connected through the 2 inner support rods 2, 2 lifting platforms 6 are further arranged between the support bases 1, the bottom of each lifting platform 6 is fixedly connected to the optical platform 7, the top of each lifting platform 6 is fixedly connected to the outer support base 3, the top of each outer support base 3 is used for placing a test piece 5, one end of the top of each outer support base 3 is further connected to the clamping pressing plate 4, the lifting platforms 6 are in signal connection with a controller, in the present embodiment, the lifting platforms 6 are in the prior art, and the controller is an existing PLC or an industrial personal computer. The invention has simple structure and easy processing and manufacturing, can change the stress state of the surface of the test piece 5 only by adjusting the height of the lifting platform, can continuously change the stress value, has flexible adjustment range, and can simultaneously adapt to various materials by one clamp; stress loading is carried out in a four-point bending mode, the defect that tensile-compression deformation and thermal deformation are not easy to generate for hard and brittle materials such as silicon wafers and the like is overcome, uniform stress layers are generated in the middle section of the test piece 5, and measurement errors caused by detection positions are avoided.
The support 1 is of a T-shaped structure, a first bolt hole is formed in each of two sides of the bottom of the support 1, a fixing hole is formed in each of the top surfaces of the supports 1, and the supports 1 are fixedly connected to the inner support rods 2 through the fixing holes. During actual test, the staff can be fixed 2 support 1 to 2 both ends of internal support pole 2 through a fixed orifices respectively on, thereby the staff can fix support 1 on optics platform 7 through a bolt hole with the bolt.
The 2 inner support rods 2 are arranged in parallel, an inner horizontal plane is formed between the 2 inner support rods 2, and the inner horizontal plane and the outer horizontal plane are arranged in parallel. In this embodiment, the outer horizontal plane of the two supporting points of the outer supporting seat 3 and the inner horizontal plane of the two supporting points of the inner supporting rod 2 are ensured to be relatively parallel, so that the subsequent four-point bending test can be ensured.
Tightly decide clamp plate 4 and be the cuboid structure, tightly decide 4 both ends of clamp plate and seted up a bolt hole No. two respectively, No. two bolt holes are used for fixed tightly deciding clamp plate 4, tightly decide 4 surfaces of clamp plate and can also seted up the locating hole, and the locating hole is used for fixing a position test piece 5. In this embodiment, the staff installs test piece 5 at outer support seat 3 both ends earlier, thereby the staff can be with the bolt through No. two bolt holes will tightly decide clamp plate 4 and fix on outer support seat 3, thereby reuse locating pin is fixed a position the one end of test piece 5 between tightly deciding clamp plate 4 and outer support seat 3.
And two sides of the lifting platform 6 are respectively provided with a bolt plate, and the lifting platform 6 is fixed to the optical platform 7 through the bolt plates. In this embodiment, the worker controls the position of the outer support base 3 through the lifting platform 6 to make the inner and outer fulcrums generate relative displacement, and finally the test piece 5 between the middle two inner support rods 2 is bent, and the surface generates stress.
Example 1
The bending deformation is easy to generate in consideration of the characteristic of low bending resistance of test pieces made of hard and brittle materials such as silicon wafers, and the surface of the test piece is subjected to stress with corresponding magnitude and direction by adopting a mode of bending the test piece. In order to generate a uniform stress field on the surface of the test piece, the test piece is always kept in a pure bending state, namely the test piece is only subjected to the action of constant bending moment, and the extension direction of the test piece keeps the curvature unchanged. As shown in fig. 2, the inner supporting rod 2 is installed between the two supporting seats 1 in a penetrating manner, the outer supporting seat 3 is installed on the lifting platform 6, the lifting platform 6 and the supporting seats 1 are installed on the optical platform 7, and the lifting platform 6 is ensured to be arranged between the two supporting seats 1; the test piece 5 is placed between the inner support rod 2 and the outer support base 3, and displacement loading is carried out on the test piece in a four-point bending mode, so that the effect that the area to be measured in the middle section is purely bent is achieved. The test piece 5 is formed by the inner supporting rod 2 and the outer supporting seat 3 in the figure 1 to jointly complete four-point bending, a supporting point at one end of the outer supporting seat 3 adopts fixed support, and is fixed and positioned by the fastening pressing plate 4, and other supporting positions are simply supported. The planes of the two supporting positions of the outer supporting seat 3 and the planes of the two supporting positions of the inner supporting rod are ensured to be relatively parallel, the position of the outer supporting seat 3 is controlled by the lifting platform 6, so that the inner supporting point and the outer supporting point generate relative displacement, finally, the test piece 5 between the two middle inner supporting rods 2 is bent, and the surface generates stress. The surface of the test piece 5 moving in the same side direction of the lifting platform 6 shows compressive stress, and the surface shows compressive stress in the reverse direction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a hard brittle material surface stress loading device of adjustable which characterized in that: the device comprises an outer support seat (3), a fastening pressing plate (4), a lifting platform (6), an optical platform (7), 2 supports (1) and 2 inner support rods (2), wherein the supports (1) are symmetrically arranged, the bottoms of the supports (1) are fixedly connected to the optical platform (7) and the bottoms of the supports (2) are connected through the 2 inner support rods (2), the lifting platform (6) is further arranged between the supports (1), the bottom of the lifting platform (6) is fixedly connected to the optical platform (7), the top of the lifting platform (6) is fixedly connected to the outer support seat (3), the top of the outer support seat (3) is used for placing a test piece (5), one end of the top of the outer support seat (3) is further connected to the fastening pressing plate (4), and the lifting platform (6) is in signal connection with a controller.
2. The adjustable hard and brittle material surface stress loading device as claimed in claim 1, characterized in that: the support (1) is of a T-shaped structure, a first bolt hole is formed in each of two sides of the bottom of the support (1), a fixing hole is formed in each of the top surfaces of the supports (1), and the supports (1) are fixedly connected to the inner supporting rods (2) through the fixing holes.
3. The adjustable hard and brittle material surface stress loading device as claimed in claim 1, characterized in that: outer support seat (3) are different in nature structure, and the arc recess has been seted up at outer support seat (3) top, and arc recess one end is connected to tightly decides clamp plate (4), and test piece (5) one end joint is to tightly deciding clamp plate (4) bottom, and the test piece (5) other end is installed to the arc recess other end, the both ends of arc recess form outer horizontal plane.
4. The adjustable hard and brittle material surface stress loading device as claimed in claim 3, characterized in that: the 2 inner supporting rods (2) are arranged in parallel, an inner horizontal plane is formed between the 2 inner supporting rods (2), and the inner horizontal plane and the outer horizontal plane are arranged in parallel.
5. The adjustable hard and brittle material surface stress loading device as claimed in claim 1, characterized in that: tightly decide clamp plate (4) and be the cuboid structure, tightly decide clamp plate (4) both ends and seted up a No. two bolt holes respectively, No. two bolt holes are used for fixed tightly deciding clamp plate (4), tightly decide clamp plate (4) surface and can also seted up the locating hole, and the locating hole is used for location test piece (5).
6. The adjustable hard and brittle material surface stress loading device as claimed in claim 1, characterized in that: and two sides of the lifting platform (6) are respectively provided with a bolt plate, and the lifting platform (6) is fixed to the optical platform (7) through the bolt plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111617720.9A CN114509336A (en) | 2021-12-27 | 2021-12-27 | Adjustable hard brittle material surface stress loading device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111617720.9A CN114509336A (en) | 2021-12-27 | 2021-12-27 | Adjustable hard brittle material surface stress loading device |
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| Publication Number | Publication Date |
|---|---|
| CN114509336A true CN114509336A (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111617720.9A Pending CN114509336A (en) | 2021-12-27 | 2021-12-27 | Adjustable hard brittle material surface stress loading device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373173A (en) * | 2008-08-27 | 2009-02-25 | 哈尔滨工业大学 | Method and apparatus for testing brittle material strength |
| CN203643278U (en) * | 2014-01-03 | 2014-06-11 | 吉林大学 | Device for testing microscopic mechanical property of four-point bending material in situ under microscope |
| CN104198289A (en) * | 2014-09-16 | 2014-12-10 | 盐城工学院 | Measuring device for four-point bending creep parameters and operating method |
| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
-
2021
- 2021-12-27 CN CN202111617720.9A patent/CN114509336A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373173A (en) * | 2008-08-27 | 2009-02-25 | 哈尔滨工业大学 | Method and apparatus for testing brittle material strength |
| CN203643278U (en) * | 2014-01-03 | 2014-06-11 | 吉林大学 | Device for testing microscopic mechanical property of four-point bending material in situ under microscope |
| CN104198289A (en) * | 2014-09-16 | 2014-12-10 | 盐城工学院 | Measuring device for four-point bending creep parameters and operating method |
| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
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