CN106908316B - Variable-size equal-thickness composite plate low-speed impact test fixture - Google Patents
Variable-size equal-thickness composite plate low-speed impact test fixture Download PDFInfo
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- CN106908316B CN106908316B CN201710214537.1A CN201710214537A CN106908316B CN 106908316 B CN106908316 B CN 106908316B CN 201710214537 A CN201710214537 A CN 201710214537A CN 106908316 B CN106908316 B CN 106908316B
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- cover plate
- lower cover
- central shaft
- limiting plates
- plate
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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
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
-
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a variable-size equal-thickness composite plate low-speed impact test fixture, which comprises an upper cover plate, a lower cover plate, a central shaft, a limiting plate, a connecting rod and a connecting block, wherein the upper cover plate is fixedly connected with the lower cover plate; the central shaft is connected to the center of the bottom of the lower cover plate through threads, and the upper cover plate and the lower cover plate are fixedly connected through the stepped holes and the circular through holes sequentially through countersunk bolts; the four limiting plates are respectively arranged on four straight groove tracks of the lower cover plate through bottom sliding blocks of the four limiting plates, two connecting blocks provided with circular through grooves are sleeved on the central shaft in a penetrating mode, the bottoms of the sliding blocks on the two limiting plates which are oppositely arranged are respectively hinged with two side walls of one connecting block through connecting rods with equal lengths, and the two limiting plates which are oppositely arranged are driven to synchronously and reversely move along the straight groove tracks of the two limiting plates through the movement of the connecting blocks along the central shaft. The invention can realize the continuous variable size of the test piece on the impact test clamp, ensures that the impact point is positioned at the center of the composite plate, effectively reduces the test cost, and has simple operation and reliable fastening.
Description
Technical Field
The invention relates to a low-speed impact test fixture, in particular to a variable-size equal-thickness composite plate low-speed impact test fixture.
Background
Advanced composite materials have been widely used in civil industrial production departments and aerospace vehicle structures at present due to their excellent mechanical properties such as specific strength and specific stiffness. The composite material is applied to each structural part of the aircraft, so that not only is the comprehensive performances of aeroelasticity, stealth and the like of the aircraft improved, but also the composite material plays a vital role in improving the performances, miniaturizing and lightening each structural part of the aircraft.
The composite structural member is inevitably subjected to low-speed and low-energy impact of foreign objects during the manufacturing and use processes. Taking an aeroengine as an example, a composite material casing is used as a supporting component of an aeroengine rotor, and two types of low-speed low-energy impact can be encountered in the manufacturing and using processes: 1) Falling impact of the tool during manufacturing or repair; 2) Impact formed by broken stones, screws and the like on the runway during take-off or landing. Under the action of low-speed low-energy impact load, the plastic deformation of the impact part and the adjacent area of the metal material component is taken as a main form of energy absorption, the composite material absorbs energy in a recoverable elastic deformation mode and an unrecoverable damage mode, wherein the damage mode is mainly represented by fiber fracture, matrix fracture, base fiber shearing, delamination and the like, and the impact damage seriously weakens the strength of the composite material component.
The impact test is an important research means for checking the mechanical property and damage of the material under impact load. The clamp is an important link in the impact test, and the clamping and fixing of the test piece is finished by the clamp. The impact test machine has the advantages that no reliable clamp exists, the time-dependent change curve of the impact force obtained by the force value display device of the impact test machine is different from the time-dependent change relation of the impact force under the real impact load, and the impact damage obtained by the test is also different from the impact damage under the real working condition. Therefore, reasonable and correct design and use of the clamp are beneficial to smooth test.
At present, the design of the impact test clamp is empirical, and grooves are engraved on the upper cover plate and the lower cover plate of the clamp for a test piece with a specific size so as to fix the position of the test piece, namely, the machining clamp is designed for the specific test piece size. And the test pieces with different sizes are required to be processed by different impact test clamps, so that the test cost is greatly increased.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides the low-speed impact test clamp for the composite plate with the variable size and the equal thickness, which has the characteristics of simple structure, convenient use, reliable fastening and the like, and can realize the continuous variable size of a test piece on the impact test clamp, thereby greatly saving the test cost.
The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the following technical scheme:
a variable-size equal-thickness composite plate low-speed impact test fixture comprises an upper cover plate, a lower cover plate, a central shaft, a limiting plate, a connecting rod and a connecting block;
the middle part of the upper cover plate is provided with a rectangular through hole, and the four vertex angles of the upper cover plate are provided with stepped holes; the middle part of the top surface of the lower cover plate is provided with a rectangular blind hole, and the central shaft is detachably arranged at the center of the bottom of the lower cover plate; the lower cover plate is provided with a circular through hole corresponding to the stepped hole, and the upper cover plate and the lower cover plate are fixedly connected through the countersunk bolts sequentially penetrating through the stepped hole and the circular through hole;
straight groove tracks on the same straight line are arranged in the middle of two opposite side edges on the lower cover plate, sliding blocks are arranged in the middle of the bottom surface of the limiting plate, and the four limiting plates are respectively arranged on the four straight groove tracks through the sliding blocks at the bottom of the limiting plates, so that the limiting plates are ensured to slide vertically to the straight lines of the side edges of the lower cover plate; two connecting blocks with circular through grooves are sleeved on the central shaft, the bottoms of the sliding blocks on the two limiting plates which are oppositely arranged are respectively hinged with two side walls of one connecting block through connecting rods with equal lengths, and the two limiting plates which are oppositely arranged are driven to synchronously and reversely move along the straight groove track where the two limiting plates are arranged through the movement of the connecting blocks along the central shaft. The synchronous reverse movement of the two limiting plates in the same direction is guaranteed through the symmetrical design, so that the center point of the test piece with the continuously variable size is always coincident with the center point of the clamp after being installed, namely the impact point is guaranteed to be at the center position of the composite material test piece.
Preferably, the connecting rod, the sliding block and the connecting block are connected through a pin shaft to form a revolute pair, so that the connection is simple and the assembly and the disassembly are convenient.
Preferably, the center shaft is connected to the center of the bottom of the lower cover plate through threads, so that the connection is stable and the assembly and the disassembly are convenient.
Preferably, two push-up nuts are sleeved on the central shaft, the position adjustment of the connecting block along the central shaft is realized by rotating the push-up nuts, and then the position adjustment of a limiting plate connected with the connecting block is realized, so that the control is convenient and efficient, and the cost is lower.
Preferably, the bottom surface middle part of lower apron is provided with the draw-in groove, and is provided with the rectangle recess at the draw-in groove middle part, and anchor clamps pass through the rectangle recess after the test piece is installed on the boss of impact testing machine workstation, and the center pin passes through threaded connection in rectangle recess center department.
The beneficial effects are that: compared with the prior art, the low-speed impact test fixture for the composite plate with the variable size and the equal thickness has the following advantages: 1. the operation is simple, the fastening is reliable, the continuous variable of the size of a test piece on the impact test clamp can be realized, and the test cost is greatly saved; 2. the synchronous reverse motion of the limiting plates in the same direction is realized through the connecting rods with equal length in the same direction, and when the four limiting plates are contacted with the four sides of the test piece at the same time, the center point of the test piece is ensured to coincide with the center point of the clamp, so that the impact point is ensured to be at the center position of the composite material test piece.
Drawings
FIG. 1 is an assembly schematic diagram of a variable-size equal-thickness composite plate low-speed impact test fixture according to the present invention;
FIG. 2 is a schematic view illustrating the installation of the lower cover plate and the upper structure of the central shaft in the present invention;
FIG. 3 is a schematic view of the structure of the lower cover plate in the present invention;
FIG. 4 is a schematic view illustrating the installation of the central shaft and the lower cover plate of the present invention;
FIG. 5 is a schematic view of a limiting plate according to the present invention;
FIG. 6 is a schematic view of the structure of the connecting block of the present invention;
the drawings include: 1. the upper cover plate, 2, the limiting plate, 3, the lower cover plate, 4, the connecting block, 5, the push-up nut, 6, the central shaft, 7, the connecting rod, 8, the rectangular through hole, 9, the stepped hole, 10, the rectangular blind hole, 11, the circular through hole, 12, the straight groove track, 13, the sliding block, 14, the circular through groove, 15, the clamping groove, 16 and the rectangular groove.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in FIG. 1, the fixture for the low-speed impact test of the composite plate with variable size and equal thickness comprises an upper cover plate 1, a lower cover plate 3, a central shaft 6, a limiting plate 2, a connecting rod 7 and a connecting block 4;
the middle part of the upper cover plate 1 is provided with a rectangular through hole 8, and four vertex angles of the upper cover plate 1 are provided with stepped holes 9; a rectangular blind hole 10 is formed in the middle of the top surface of the lower cover plate 3, and a central shaft 6 is detachably arranged at the center of the bottom of the lower cover plate 3; the lower cover plate 3 is provided with a circular through hole 11 corresponding to the stepped hole 9, and the upper cover plate 1 and the lower cover plate 3 are fixedly connected by penetrating the stepped hole 9 and the circular through hole 11 in sequence through countersunk bolts;
as shown in fig. 3, straight groove tracks 12 on the same straight line are arranged in the middle of two opposite side edges on the lower cover plate 3, sliding blocks 13 are arranged in the middle of the bottom surface of the limiting plate 2, and four limiting plates 2 are respectively arranged on the four straight groove tracks 12 through the bottom sliding blocks 13, so that the limiting plate 2 is ensured to slide vertically to the straight line of the side edge of the lower cover plate 3; as shown in fig. 2, two connecting blocks 4 with circular through grooves 14 are sleeved on a central shaft 6, bottoms of sliding blocks 13 on two opposite limiting plates 2 are respectively hinged with two side walls of one connecting block 4 through connecting rods 7 with equal lengths, and the two opposite limiting plates 2 are driven to synchronously and reversely move along straight groove tracks 12 where the two opposite limiting plates are positioned through movement of the connecting blocks 4 along the central shaft 6.
In this embodiment, the central shaft 6 is sleeved with two push-up nuts 5, and the position of the connecting block 4 on the central shaft 6 is adjusted by rotating the push-up nuts 5; as shown in fig. 5 and 6, the connecting rod 7, the sliding block 13 and the connecting block 4 are connected through a pin shaft to form a revolute pair.
As shown in fig. 4, a clamping groove 15 is formed in the middle of the bottom surface of the lower cover plate 3, a rectangular groove 16 is formed in the middle of the clamping groove 15, and the central shaft 6 is connected to the center of the rectangular groove 16 through threads.
The specific embodiments of the present invention are as follows:
when in use, the central shaft 6 is connected to the center of the rectangular groove 16 through threads, and the two connecting blocks 4 and the two push-up nuts 5 are sleeved on the central shaft 6 in the sequence shown in fig. 2; the four limiting plates 2 are respectively arranged on straight groove tracks 12 of the lower cover plate 3, and according to the illustration of fig. 2, the two limiting plates 2 in the same direction are connected to the same connecting block 4 through the connecting rods 7 with equal length; the position of the connecting block 4 on the central shaft 6 is adjusted by rotating the push-up nut 5, and then the limiting plates 2 are driven to slide along the straight groove track 12 by the connecting rod 7, so that the distance between the oppositely arranged limiting plates 2 is larger than the dimension of the test piece in the same direction;
placing a rectangular equal-thickness composite material test piece on the upper surface of the lower cover plate 3 and in the middle of the four limiting plates 2, wherein the thickness of the test piece is required to be larger than that of the limiting plates 2; the lower push-up nut 5 is rotated, so that the connecting block 4 on the lower push-up nut moves downwards along the central shaft 6, the limiting plate 2 is driven by the connecting rod 7 to move downwards to the center of the cover plate 3 under the action of the gravity of the connecting block 4 until the limiting plate 2 contacts with the side edge of the test piece, a gap is formed between the push-up nut 5 and the connecting block 4, and the center of the test piece in the direction is ensured to be positioned on the central shaft line of the clamp through the connecting rod 7 with equal length;
when the center of the test piece is positioned on the central axis of the clamp in two vertical directions, the upper cover plate 1 is placed on the test piece, four through holes between the upper cover plate and the lower cover plate are aligned, and the upper cover plate and the lower cover plate are fastened and connected by countersunk bolts, so that the fastening and clamping of the composite plate are realized;
sequentially removing the pin shafts between the limiting plates 2 and the connecting rods 7, the pin shafts between the connecting rods 7 and the connecting blocks 4, the four limiting plates 2 and the central shaft 6; the impact test fixture for fixing the composite material test piece is arranged on the boss of the working table of the impact test machine through the rectangular groove 16 below the lower cover plate, so that the impact test point can be ensured to be at the right center of the test piece.
Test shows that the variable-size equal-thickness composite plate low-speed impact test clamp can well fasten a composite plate-shaped test piece and ensure that the center of the test piece is positioned on the central axis of the clamp, thereby ensuring that an impact point is positioned at the center of the composite plate. The clamp can realize continuous variation of the size of a test piece, so that the problem that the size of a test piece of the conventional impact test clamp is single is solved, and the test cost is reduced. The clamp can also be suitable for low-speed impact tests of plate-shaped test pieces of other materials.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (5)
1. The fixture for the low-speed impact test of the composite plate with the variable size and the equal thickness is characterized by comprising an upper cover plate (1), a lower cover plate (3), a central shaft (6), a limiting plate (2), a connecting rod (7) and a connecting block (4);
the middle part of the upper cover plate (1) is provided with a rectangular through hole (8), and four vertex angles of the upper cover plate (1) are provided with stepped holes (9); a rectangular blind hole (10) is formed in the middle of the top surface of the lower cover plate (3), and a central shaft (6) is detachably arranged at the center of the bottom of the lower cover plate (3); the lower cover plate (3) is provided with a circular through hole (11) corresponding to the stepped hole (9), and the upper cover plate (1) and the lower cover plate (3) are fixedly connected by sequentially penetrating the stepped hole (9) and the circular through hole (11) through countersunk bolts;
straight groove tracks (12) on the same straight line are arranged in the middle of two opposite side edges of the lower cover plate (3), sliding blocks (13) are arranged in the middle of the bottom surface of the limiting plate (2), and the four limiting plates (2) are respectively arranged on the four straight groove tracks (12) through the bottom sliding blocks (13) of the limiting plates; two connecting blocks (4) with circular through grooves (14) are sleeved on a central shaft (6), bottoms of sliding blocks (13) on two limiting plates (2) which are oppositely arranged are hinged with two side walls of one connecting block (4) through connecting rods (7) with equal lengths respectively, and the two limiting plates (2) which are oppositely arranged are driven to synchronously and reversely move along straight groove tracks (12) where the limiting plates are arranged through movement of the connecting blocks (4) along the central shaft (6).
2. The low-speed impact test fixture for the composite plate with the variable size and the equal thickness according to claim 1 is characterized in that a rotating pair is formed by connecting the connecting rod (7) with the sliding block (13) and the connecting block (4) through pin shafts.
3. The low-speed impact test fixture for the composite plate with the variable size and the equal thickness according to claim 1 is characterized in that the central shaft (6) is connected to the bottom center of the lower cover plate (3) through threads.
4. The fixture for the low-speed impact test of the composite plate with the variable size and the equal thickness according to claim 1 is characterized in that two push-up nuts (5) are sleeved on the central shaft (6), and the position adjustment of the connecting block (4) on the central shaft (6) is realized by rotating the push-up nuts (5).
5. The low-speed impact test fixture for the composite plate with the variable size and the equal thickness according to claim 1 is characterized in that a clamping groove (15) is formed in the middle of the bottom surface of the lower cover plate (3), a rectangular groove (16) is formed in the middle of the clamping groove (15), and the central shaft (6) is connected to the center of the rectangular groove (16) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214537.1A CN106908316B (en) | 2017-04-01 | 2017-04-01 | Variable-size equal-thickness composite plate low-speed impact test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710214537.1A CN106908316B (en) | 2017-04-01 | 2017-04-01 | Variable-size equal-thickness composite plate low-speed impact test fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106908316A CN106908316A (en) | 2017-06-30 |
| CN106908316B true CN106908316B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710214537.1A Active CN106908316B (en) | 2017-04-01 | 2017-04-01 | Variable-size equal-thickness composite plate low-speed impact test fixture |
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| Country | Link |
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| CN (1) | CN106908316B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109746837B (en) * | 2019-03-06 | 2023-11-10 | 长春理工大学 | Variable-size clamp for abrasive flow machining of valve block through hole |
| CN112504824B (en) * | 2019-09-16 | 2022-02-15 | 华中科技大学 | Variable thickness composite material laminated plate impact-resistant clamp |
| CN111024526A (en) * | 2019-12-30 | 2020-04-17 | 北海市龙浩光电科技有限公司 | Ring strikes fixed detection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815172A (en) * | 2006-02-21 | 2006-08-09 | 中国建筑材料科学研究院 | Friction-wear detecting apparatus |
| CN205138889U (en) * | 2015-11-16 | 2016-04-06 | 郑州大学 | Experimental panel test piece anchor clamps of hammer impact that falls |
| CN206671065U (en) * | 2017-04-01 | 2017-11-24 | 南京航空航天大学 | One kind becomes size equal thickness composite panels low velocity impact test fixture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6634630B2 (en) * | 1999-06-01 | 2003-10-21 | Aladdin Engineering & Manufacturing | Clamping and lifting mechanism |
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2017
- 2017-04-01 CN CN201710214537.1A patent/CN106908316B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815172A (en) * | 2006-02-21 | 2006-08-09 | 中国建筑材料科学研究院 | Friction-wear detecting apparatus |
| CN205138889U (en) * | 2015-11-16 | 2016-04-06 | 郑州大学 | Experimental panel test piece anchor clamps of hammer impact that falls |
| CN206671065U (en) * | 2017-04-01 | 2017-11-24 | 南京航空航天大学 | One kind becomes size equal thickness composite panels low velocity impact test fixture |
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| CN106908316A (en) | 2017-06-30 |
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