CN110553905B - Anti-destabilization clamp and system for double-shaft loading of cross test piece - Google Patents
Anti-destabilization clamp and system for double-shaft loading of cross test piece Download PDFInfo
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- CN110553905B CN110553905B CN201910833823.5A CN201910833823A CN110553905B CN 110553905 B CN110553905 B CN 110553905B CN 201910833823 A CN201910833823 A CN 201910833823A CN 110553905 B CN110553905 B CN 110553905B
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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Abstract
The invention provides an anti-instability clamp for biaxial loading of a cross test piece, which relates to the technical field of mechanical stress testing, can eliminate friction with a test piece caused by the gravity of the clamp, realizes an anti-instability function during bidirectional loading, and ensures the accuracy of a test result; the device comprises an upper clamping plate, a lower clamping plate, a supporting structure and a fixing structure connected with test equipment; the upper clamping plate and the lower clamping plate are arranged in parallel; one end of the supporting structure is connected with the upper clamping plate and the lower clamping plate, and the other end of the supporting structure is connected with the fixing structure; and a cross space for placing the cross test piece is arranged between the upper clamping plate and the lower clamping plate. The technical scheme provided by the invention is suitable for the process of carrying out mechanical stress test by biaxial loading of the cross-shaped test sample.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of mechanical stress testing, in particular to an anti-destabilization clamp and an anti-destabilization system for biaxial loading of a cross test piece.
[ background of the invention ]
The actual components of the airplane are mostly in a complex stress state, the cross-shaped test piece biaxial loading test piece can better simulate the actual stress state, and the cross-shaped test piece biaxial loading test piece is frequently used in airplane facilities. When a biaxial in-plane compression load is applied to a cross-shaped plate test piece, along with the increase of the compression load, the test piece tends to be unstable on the premise of no instability-preventing clamp, so that test data are abnormal, and the damage form of the test piece deviates from the expectation finally.
Chinese patent CN106769424B discloses an anti-destabilization universal fixture for testing the compression performance of an edge/center notch composite material laminated plate, which fixes metal clamping plates on both sides of a test piece through butterfly nuts and bolts to realize the anti-destabilization function, and places nylon interlayers between the metal clamping plates and the test piece to reduce the friction between the fixture and the test piece. However, the instability-preventing clamp only considers the instability-preventing characteristic of unidirectional loading, and the test clamp is not fixed on test equipment, so that the clamp is unstable in the test process. Chinese patent CN107179236A discloses an anti-destabilization device and a test method for fatigue test of fiber composite material, the anti-destabilization device has the same design principle as the above anti-destabilization universal fixture, and after a test piece clamps shiya, two sides of a hyperboloid dumbbell-shaped test piece are fixed by pressing plates to realize the anti-destabilization function. The anti-instability characteristic of unidirectional loading can be realized, and the loading process is unstable.
Accordingly, there is a need to develop an anti-destabilization clamp and system for biaxial loading of a cross specimen that addresses the deficiencies of the prior art to address or mitigate one or more of the problems set forth above.
[ summary of the invention ]
In view of the above, the invention provides an anti-instability clamp and an anti-instability system for biaxial loading of a cross test piece, which can eliminate friction with the test piece caused by the gravity of the clamp, realize an anti-instability function during bidirectional loading, and ensure the accuracy of a test result.
On one hand, the invention provides an anti-destabilization clamp for biaxial loading of a cross test piece, which is characterized by comprising an upper clamping plate, a lower clamping plate, a supporting structure and a fixing structure connected with test equipment;
the upper clamping plate and the lower clamping plate are arranged in parallel; one end of the supporting structure is connected with the upper clamping plate and the lower clamping plate, and the other end of the supporting structure is connected with the fixing structure;
and a cross space for placing the cross test piece is arranged between the upper clamping plate and the lower clamping plate.
As to the aspects and any possible implementation manners described above, further provided is an implementation manner, wherein the support structure includes four support studs, the support studs sequentially penetrate through the upper clamping plate and the lower clamping plate, and the upper clamping plate and the lower clamping plate are fixed on the support studs by locknuts.
The above aspect and any possible implementation further provides an implementation in which an adjustable bushing is provided between the upper clamp plate and the lower clamp plate; the number of the adjustable bushings is four, and the four adjustable bushings are respectively sleeved on the peripheries of the four support studs.
In the aspect and any possible implementation manner described above, an implementation manner is further provided, in which the fixing structure includes an anti-twist anchor, a fastening cushion block, and a first locknut for fixing the fastening cushion block, which are sequentially sleeved on the periphery of the support stud from bottom to top.
The above aspect and any possible implementation manner further provide an implementation manner, wherein a viewing window is arranged in the middle of the upper clamping plate.
There is further provided in accordance with the above-described aspect and any one of the possible implementations, an implementation in which the lower surface of the upper clamp plate is provided with a cable channel.
The above aspect and any possible implementation manner further provide an implementation manner, and a specific manner of fixing the upper clamp and the lower clamp by the locknut is as follows: and a third locknut used for fixing the lower clamp is arranged below the lower clamp, and a second locknut used for fixing the upper clamp is arranged above the upper clamp.
The aspect and any possible implementation manner described above further provide an implementation manner, when the anti-destabilization clamp is connected with the test equipment, the anti-torsion anchor is placed in the connecting groove, the fastening cushion block is placed above the connecting groove, and the fastening cushion block is screwed and fixed by using the first locknut.
The above aspect and any possible implementation manner further provide an implementation manner that the surface of the cross test piece has no friction with the inner wall of the cross space.
The above aspects and any possible implementation manners further provide an implementation manner, and a specific manner of no friction is that the surface of the cross test piece is not in contact with the inner wall of the cross space; the clearance between the surface of the cross test piece and the inner wall of the cross space is 0.5mm-1 mm.
In another aspect, the invention provides a system for measuring aircraft profiles, comprising a measuring device and a profile fixture, characterized in that the profile fixture comprises an anti-destabilizing clamp as defined in any of the above.
Compared with the prior art, the invention can obtain the following technical effects: the upper clamping plate and the lower clamping plate are fixed on two sides of the test piece through the locknuts, so that the buckling prevention function is realized; the friction between the test piece and the fixture caused by the gravity of the fixture is eliminated, and the accuracy of a test result is ensured while the anti-instability function is realized by bidirectional loading; the instability-proof clamp and the test equipment are integrated, so that the rigidity of the clamp is increased to a certain extent; by adopting the biaxial anti-instability design, the out-of-plane instability of the test piece is prevented in the process of ensuring the normal loading process of the test piece.
Of course, it is not necessary for any product to achieve all of the above-described technical effects simultaneously in the practice of the invention.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an anti-destabilization clamp for biaxial loading of a cross test piece according to an embodiment of the invention.
Wherein, in the figure:
1. an adjustable bushing; 2. a support stud; 3. anti-twisting ground feet; 4. fastening a cushion block; 5. a first locknut; 6. a lower splint; 7. an upper splint; 8. a second locknut; 9. a third locknut; 10. a cable channel; 11. an observation window; 12. a cross test piece.
[ detailed description ] A
In order to better understand the technical scheme of the invention, the following detailed description of the embodiments of the invention is made with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In view of the defects of the prior art, the invention provides an anti-destabilization clamp for biaxial loading of a cross test piece. Meanwhile, the clamp plate is connected with one end of the double-end stud through the locknut, the other end of the double-end stud is connected with the testing equipment, friction between the clamp plate and a test piece caused by the gravity of the clamp can be eliminated, and the accuracy of a testing result is guaranteed while the anti-instability function is realized by bidirectional loading.
As shown in fig. 1, the anti-destabilization clamp for biaxial loading of the cross test piece comprises: adjustable bush 1, support stud 2, prevent turning round lower margin 3, fastening cushion 4, first locknut 5, lower plate 6, punch holder 7, second locknut 8 and third locknut 9. Wherein, the number of the support studs 2 is four, and four support columns of the anti-instability clamp are formed. The upper clamping plate 7 and the lower clamping plate 6 are both square, and mounting holes are respectively formed at four corners; four mounting holes of the lower clamping plate 6 are respectively sleeved on the four supporting studs, four mounting holes of the lower clamping plate 7 are respectively sleeved on the four supporting studs, and the upper clamping plate is arranged above the lower clamping plate. The adjustable bush 1 is sleeved at a support stud between the upper clamping plate and the lower clamping plate, the adjustable bush 1 is used for adjusting the distance between the upper clamping plate and the lower clamping plate to be matched with the thickness of a cross test piece 12, the specific matching requirement is that the surface of the test piece and the surface of a clamp (namely the lower surface of the upper clamp and the upper surface of the lower clamp) have no friction, the gap is not too large, and the gap is ensured to be between 0.5mm and 1 mm. The upper part of the upper splint 7 is fixed by four second locknuts 8, and the lower part of the lower splint 6 is fixed by four third locknuts 9. The upper clamping plate and the lower clamping plate are fixed on the upper surface and the lower surface of the cross test piece 12 through the locknuts, and the buckling prevention function is achieved. The upper clamping plate, the lower clamping plate and the adjustable bushing are all arranged at the upper end part of the supporting stud. The middle of the upper clamping plate 7 is provided with a square observation window 11 through which the state of the cross-shaped sample can be observed. The lower surface of the upper clamping plate 7 is provided with a cable channel 10 for a cable for data acquisition to extend out of the channel. The adjustable bush 1 is provided with a plurality of types according to the height difference, and when the adjustable bush 1 is used, the adjustable bush 1 with the proper height is selected according to the thickness of the cross test piece. The height of the adjustable bush 1 with proper height, namely the selected height, is slightly larger than the thickness of the cross test piece, so that the cross test piece is not in contact with the upper clamping plate and the lower clamping plate, and no friction exists.
The bottom of four support studs 2 all is equipped with and is used for the structure fixed with the experimental facilities, from upwards including preventing turning round lower margin 3, fastening cushion 4 and first locknut 5 down in proper order, prevents turning round lower margin 3, fastening cushion 4 and first locknut 5 and all overlaps and establish on the support stud. A certain distance is reserved between the anti-twist anchor feet 3 and the fastening cushion blocks 4, and the distance is different according to different depths of the grooves of the experimental equipment; when the anti-twist anchor 3 is fixed, the anti-twist anchor is arranged in the groove, the fastening cushion block 4 is arranged above the groove, and the first locknut 5 is used for screwing the fastening cushion block 4 to fix the groove. The fastening cushion block is fastened through the locknut, so that the support stud and the test equipment are fixed, the rigidity of the clamp is increased, the influence of the dead weight of the clamp on a test piece is eliminated, and the stability of the test clamp can be improved in the test process.
When the anti-instability clamp is assembled, the concrete steps comprise:
the method comprises the following steps: placing the anti-torsion anchor in a groove of the test equipment by utilizing the self-contained structure of the test equipment, screwing four support studs, installing a fastening cushion block and a first locknut, and fixing the four support studs on the test equipment;
step two: a third locknut, a lower clamping plate and an adjustable bushing are sequentially arranged at the other end of the support stud;
step three: mounting a cross test piece, wherein the third locknut and the adjustable bushing can be adjusted in the process of mounting the cross test piece, so that the four third locknuts are kept horizontally consistent, and the lower clamping plate is equidistant to the surface of the cross test piece;
step four: installing an upper clamping plate and four second locknuts, and finishing the installation of the anti-instability clamp; the cross test piece can be subjected to biaxial loading.
In the test process, deformation observation of the assessment area can be realized through the observation window, and cables of the assessment area data acquisition device can be led out through the cable channel 10.
When bidirectional loading is carried out, the upper clamping plate and the lower clamping plate can limit the out-of-plane deformation of the cross test piece, and the anti-instability function is exerted. In addition, the anti-instability clamp and the test equipment are fixed into a whole, and the rigidity of the clamp is increased to a certain extent.
The whole clamp is a steel clamp.
The anti-instability clamp can effectively realize the anti-instability function of the test piece during double-shaft loading; the connection mode of the clamp and the experimental equipment can improve the stability of the clamp in the test process; the design theory of instability is prevented to biax of this application can prevent that the test piece from taking place the off-plane instability at the in-process that guarantees that the test piece normally bears the load.
The anti-instability clamp for biaxial loading of the cross test piece provided by the embodiment of the application is introduced in detail. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (6)
1. An anti-destabilization clamp for biaxial loading of a cross test piece is characterized by comprising an upper clamping plate, a lower clamping plate, a supporting structure and a fixing structure connected with test equipment;
the upper clamping plate and the lower clamping plate are arranged in parallel; one end of the supporting structure is connected with the upper clamping plate and the lower clamping plate, and the other end of the supporting structure is connected with the fixing structure;
a cross space for placing the cross test piece is arranged between the upper clamping plate and the lower clamping plate, and the surface of the cross test piece has no friction with the inner wall of the cross space; the friction-free specific mode is that the surface of the cross test piece is not contacted with the inner wall of the cross space;
the supporting structure comprises four supporting studs, the supporting studs sequentially penetrate through the upper clamping plate and the lower clamping plate, and the upper clamping plate and the lower clamping plate are fixed on the supporting studs by adopting locknuts;
an adjustable bushing is arranged between the upper clamping plate and the lower clamping plate; the number of the adjustable bushings is four, and the four adjustable bushings are sleeved on the peripheries of the four support studs respectively;
the specific mode of fixing the upper clamping plate and the lower clamping plate by the locknut is as follows: and a third anti-loosening nut used for fixing the lower clamping plate is arranged below the lower clamping plate, and a second anti-loosening nut used for fixing the upper clamping plate is arranged above the upper clamping plate.
2. The anti-instability clamp for biaxial loading of the cross test piece according to claim 1, wherein the fixing structure comprises an anti-torsion foot, a fastening cushion block and a first locknut, the anti-torsion foot, the fastening cushion block and the first locknut are sequentially sleeved on the periphery of the supporting stud from bottom to top, and the first locknut is used for fixing the fastening cushion block.
3. The anti-destabilization clamp for biaxial loading of the cross test piece as recited in claim 1, wherein an observation window is arranged in the middle of the upper clamping plate, and a cable channel is arranged on the lower surface of the upper clamping plate.
4. The anti-instability clamp for biaxial loading of the cross test piece according to claim 2, wherein when the anti-instability clamp is connected with the test equipment, the anti-torsion anchor is placed in the connecting groove, the fastening cushion block is placed above the connecting groove, and the fastening cushion block is screwed and fixed by the first locknut.
5. The anti-destabilization clamp for biaxial loading of the cross test piece according to claim 1, wherein the clearance between the surface of the cross test piece and the inner wall of the cross space is between 0.5mm and 1 mm.
6. A system for measuring aircraft profiles, comprising a measuring device and a profile fixture, characterized in that the profile fixture comprises an anti-destabilizing clamp according to any of claims 1-5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910833823.5A CN110553905B (en) | 2019-09-04 | 2019-09-04 | Anti-destabilization clamp and system for double-shaft loading of cross test piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910833823.5A CN110553905B (en) | 2019-09-04 | 2019-09-04 | Anti-destabilization clamp and system for double-shaft loading of cross test piece |
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| CN110553905A CN110553905A (en) | 2019-12-10 |
| CN110553905B true CN110553905B (en) | 2022-07-01 |
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| CN112857978B (en) * | 2020-08-07 | 2022-08-05 | 同济大学 | Two-way compression test fixture of combined material plywood |
| CN113466028A (en) * | 2021-06-24 | 2021-10-01 | 燕山大学 | Cross compressed sample clamp for double-shaft loading system and loading method thereof |
| CN113820115A (en) * | 2021-09-24 | 2021-12-21 | 无锡威孚力达催化净化器有限责任公司 | Double-shaft lifting lug fatigue performance testing device |
| CN117300889B (en) * | 2023-11-30 | 2024-02-09 | 宁波甬禾电子有限公司 | Cylindrical part grinding clamp capable of stably clamping |
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| CN2909230Y (en) * | 2006-04-07 | 2007-06-06 | 中国航空工业第一集团公司北京航空材料研究院 | Anti-bending clamp of metal sheel axial drawing press fatigue test |
| JP5527694B2 (en) * | 2010-07-29 | 2014-06-18 | 学校法人日本大学 | Biaxial tensile testing equipment |
| CN202676469U (en) * | 2012-06-28 | 2013-01-16 | 重庆建设摩托车股份有限公司 | Motorcycle test fixture mounting structure |
| CN103267672B (en) * | 2013-05-13 | 2015-01-14 | 北方工业大学 | Bending prevention system and method for tension compression circulation and loading experiment of double-shaft sheet |
| CN105842055B (en) * | 2016-03-15 | 2018-05-18 | 北京航空航天大学 | A kind of strength test fixture that control with changed scale Biaxial stress is carried out using single axis test machines |
| JP2018080923A (en) * | 2016-11-14 | 2018-05-24 | Ｊｆｅスチール株式会社 | Biaxial compression and tension testing jig and biaxial compression and tension testing method |
| CN106769424B (en) * | 2016-12-12 | 2019-04-09 | 北京航空航天大学 | A kind of anti-unstability universal fixturing tested for edge/central indentation composite laminated plate compression performance |
| CN107179236B (en) * | 2017-06-16 | 2020-12-11 | 南京玻璃纤维研究设计院有限公司 | Anti-destabilization device for fiber composite material fatigue test and test method |
| CN107976364B (en) * | 2017-11-17 | 2019-11-22 | 北方工业大学 | A kind of test device for realizing three-dimensional stress state and stress-strain data acquisition |
| CN109668821A (en) * | 2019-02-20 | 2019-04-23 | 西北工业大学 | A kind of treadmill test part measured material for high-low-temperature environmental testing case |
| CN109916713A (en) * | 2019-04-01 | 2019-06-21 | 燕山大学 | A kind of cross compression specimen holder and loading method for Biaxial stress system |
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