CN111558907A - Fatigue test clamp for typical angle-shaped connecting piece of bulkhead and using method - Google Patents
Fatigue test clamp for typical angle-shaped connecting piece of bulkhead and using method Download PDFInfo
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- CN111558907A CN111558907A CN201910383900.1A CN201910383900A CN111558907A CN 111558907 A CN111558907 A CN 111558907A CN 201910383900 A CN201910383900 A CN 201910383900A CN 111558907 A CN111558907 A CN 111558907A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a fatigue test fixture for a typical angle connector of a bulkhead and a use method, and is particularly suitable for an L-shaped connector with design requirements on special sections, wherein the fixture comprises a fixed box body, a side plate, a lever and a loading mechanism, and the fixed box body is vertically connected with the lever; the horizontal part and the side plate of the angular connecting piece are fixedly connected in the fixed box body from bottom to top, and the side plate is fixedly connected with the horizontal part of the angular connecting piece; the lever is provided with a groove, and the vertical part of the angle-shaped connecting piece is fixed in the groove; the loading mechanism comprises an upper loading assembly and a lower loading assembly, the upper loading assembly is rotatably connected with the fixed box body, and the lower loading assembly is rotatably connected with the lever. The loading piece connected with the angle connecting piece can move along with the displacement of the chuck of the testing machine in the loading process, so that the actual stress state of the angle connecting piece is correctly simulated. The fatigue test device is reasonable in structural design and convenient to clamp, and ensures that the fatigue test of the connecting piece with special design requirements on the loaded part is smoothly carried out.
Description
Technical Field
The invention belongs to the technical field of clamps, and particularly relates to a fatigue test clamp and a test method for a typical angle connector of a spacer frame, in particular to an airplane angle connector with a load requirement.
Background
The majority of the loads borne by the aircraft angle connectors are alternating loads, fatigue failure is the main failure mode, and therefore, the research on the fatigue strength and the fatigue life of the aircraft angle pieces through experiments is very important. The fatigue performance test of the angle connecting piece needs to clamp the angle connecting piece test piece on a specially designed clamp, and the fatigue testing machine is used for loading through a loading clamp, so that the mechanical properties of the fatigue strength, the fatigue life, the failure mode and the like of the model are finally obtained. Therefore, the experiment fixture is crucial to the accuracy of the experiment result in order to correctly simulate the mechanical characteristics of the airplane in flight.
The tensile test fixture is a device for clamping a sample, and realizing that a mechanical testing machine transmits longitudinal tensile force to the sample to enable the sample to generate elastic or plastic tensile deformation. Because the size of the angle-shaped connecting piece is small, if the angle-shaped connecting piece is directly arranged on a stretching machine, the existing stretching test machine clamp is easy to have the phenomena of camber deformation, disappearance of clamping force, slippage and the like during a stretching test.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fatigue test fixture and a test method for a typical angle connecting piece of a bulkhead, which ensure that the angle connecting piece is clamped in a standard fatigue test machine, a test sample is accurately positioned and stably clamped, the design requirements of component force, bending moment and direction of an examination section are met, and the stress state of the angle connecting piece in the actual flight of an airplane is accurately simulated.
The technical scheme adopted by the invention is as follows:
a fatigue test fixture for a typical angle connecting piece of a bulkhead comprises a fixed box body, a side plate, a lever and a loading mechanism, wherein the fixed box body is vertically connected with the lever (in an L shape); the horizontal part of the angular connecting piece and the side plate are fixedly connected in the fixed box body from bottom to top, and the side plate is fixedly connected with the horizontal part of the angular connecting piece; the lever is provided with a groove, and the vertical part of the angle-shaped connecting piece is fixed in the groove; the loading mechanism comprises an upper loading assembly and a lower loading assembly, the upper loading assembly is rotatably connected with the fixed box body, and the lower loading assembly is rotatably connected with the lever. In the loading process, the fixed box body and the lever which are connected with the angle-shaped connecting piece move along with the displacement of the loading assembly, so that the actual stress state of the angle-shaped connecting piece is correctly simulated.
In the invention, the angle connector comprises a vertical part and a horizontal part, wherein the vertical part is fixed in the fixed box body, and the horizontal part is fixed in the groove of the lever.
The upper loading assembly is connected with the fixed box body through a pin, the lower loading assembly is connected with the lever through a pin, and the pin holes of the upper loading assembly and the lower loading assembly are provided with bearings so that the end, connected with the fixed box body, of the upper loading assembly rotates along the pin, and the end, connected with the lever, of the lower loading assembly rotates along the pin.
The horizontal part of the angle connecting piece, the vertical part of the angle connecting piece, the fixed box body and the lever all comprise a side surface and a bottom surface, and the side surface is vertical to the bottom surface.
One side of the horizontal part of the angle connecting piece is fixedly connected with the side surface of the fixed box body, the other side of the horizontal part of the angle connecting piece is fixedly connected with the side plate, and the bottom surface of the horizontal part of the angle connecting piece is fixedly connected with the bottom surface of the fixed box body; one side of the vertical part of the angle-shaped connecting piece is fixedly connected with the side surface of the lever, and the bottom surface of the vertical part of the angle-shaped connecting piece is fixedly connected with the bottom surface of the lever;
the side plate comprises a bottom surface and a side surface, the bottom surface of the side plate is fixedly connected with the bottom surface of the fixed box body, and the side surface of the side plate is fixedly connected with the horizontal part of the angle-shaped connecting piece. The bottom surface and the side surface of the side plate are vertical.
The gaps of all parts of the invention are adjusted by the gasket according to the standard.
Preferably the fixed connection is a row of bolt fixed connections.
The clamp is made of 30CrMnSiA alloy steel, so that the clamp has high enough rigidity in the loading direction, and the fixed part around the test piece is prevented from generating excessive deformation in the loading process.
The invention also provides a use method of the fatigue test fixture for the typical angle connector of the bulkhead, which comprises the following steps:
s1, putting the horizontal part of the angle connecting piece into the fixed box body and fixedly connecting the horizontal part with the fixed box body;
s2, fixedly connecting the side plates with the angle-shaped connecting pieces and fixing the side plates in the fixed box body;
s3, fixing the vertical part of the angle connector in the lever groove;
s4, the upper loading assembly is rotationally connected with the fixed box body, and the lower loading assembly is rotationally connected with the lever;
s5, fixing the loading assembly on the experiment machine through a hydraulic chuck;
s6 starts the tester to test.
Further, in step S1, the horizontal portion side of the angle connector is fixedly connected to the side of the fixed box.
The invention has the beneficial effects that:
the fatigue test fixture for the typical angle-shaped connecting piece of the bulkhead has the advantages of reasonable structure, compact elements, convenience in assembly and disassembly and capability of reducing labor intensity. The positioning element is reasonable, belongs to complete positioning (large plane and short pin), has low cost and durability, and can meet the requirements of checking section force and bending moment in tensile and fatigue tests.
The standard testing machine only has displacement in the vertical direction at the loading end so as to limit the displacement and bending moment of the loaded part of the test piece in other directions. The angle connector adopts a cuboid positioning principle, the bottom surface and two side surfaces of the horizontal part of the angle connector are attached to the surface of the fixed box body, and the bottom surface and the two side surfaces of the horizontal part of the angle connector are fixed and clamped through the rows of bolts, so that the freedom degree of a test piece is limited, the angle connector is completely fixed with the side plates and the lever, in addition, the angle connector is fixed with the side plates and the lever through the bolts, and the assembly problem which is possibly generated when the horizontal part of the angle connector is fixed can be solved. During the loading process, the fixed box body and the lever connected with the angle-shaped connecting piece move along with the displacement of the loading assembly, so that the actual stress state of the angle-shaped piece is correctly simulated.
Fixed box body and lever have with test piece matched with constant head tank and bolt hole, can connect stable the fixing on the anchor clamps body of test piece with the angular form, prevent that the sample atress from skidding and splashing out injury personnel and equipment, so its structural design is reasonable. The upper loading assembly or the lower loading assembly is provided with an adjusting and correcting center device, so that the coaxiality is ensured. In the test process, the sample breakpoint of the clamp is good, the sample is broken in the gauge length, and the data discreteness is small.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of an experimental apparatus for testing fatigue properties of an angle connector using the jig of the present invention;
FIG. 2 is a perspective view of a typical angle-shaped connection test piece;
FIG. 3 is a perspective view of the assembled box, side panels and corner connectors;
FIG. 4 is a side panel perspective view;
FIG. 5 is a perspective view of the cartridge;
FIG. 6 is a perspective view of the lever;
FIG. 7 is an assembled perspective view of the stationary box and the lever;
figure 8 is a perspective view of the entire jig with a loading end.
The sequence numbers in the figures illustrate: the device comprises an upper loading assembly 1, a pin 2, a bolt 3, a side plate 4, a lower loading assembly 5, a hydraulic chuck 6, a fatigue testing machine 7, a lever 8, a connecting piece 9 and a fixed box body 10.
Detailed Description
Example 1
As shown in FIGS. 1-8: a fatigue test fixture for a typical angle connector of a bulkhead comprises a fixed box body 10, a side plate 4, a lever 8 and a loading mechanism, wherein the fixed box body 10 and the lever 8 are vertically connected (in an L shape); the horizontal part of the angle connecting piece 9 and the side plate 4 are fixedly connected in the fixed box body 10 from bottom to top, the side plate 4 comprises a bottom surface and a side surface, one side of the horizontal part of the angle connecting piece 9 is fixedly connected with the side surface of the fixed box body 10, the other side of the horizontal part of the angle connecting piece 9 is fixedly connected with the side surface of the side plate 4, and the bottom surface of the side plate 4 is fixedly connected with the bottom surface of the fixed box body 10; the lever 8 is provided with a groove, and the vertical part of the angle-shaped connecting piece 9 is fixed in the groove; one side of the vertical part of the angle connecting piece 9 is fixedly connected with the side of the lever 8; the loading mechanism comprises an upper loading assembly 1 and a lower loading assembly 5, the upper loading assembly 1 is connected with a fixed box body 10 through a pin 2, the lower loading assembly 5 is connected with a lever 8 through the pin 2, lubricating bearings are arranged in pin holes of the upper loading assembly 1 and the lower loading assembly 5, the end, connected with the fixed box body 10, of the upper loading assembly 1 rotates along the pin 2, and the end, connected with the lever 8, of the lower loading assembly 5 rotates along the pin 2.
The gaps of all parts of the invention are adjusted by the gasket according to the standard.
The fixed connection is a row of bolt fixed connection.
A method of using a fatigue test fixture for a bulkhead typical angle connector, comprising the steps of:
s1, putting the horizontal part of the angle connector 9 into the fixed box body 10, and fixedly connecting the horizontal part with the fixed box body 10 through a plurality of bolts;
s2 connecting the side of side plate 4 with the horizontal part of angle connector 9 through a plurality of bolts;
s3, fixing the bottom surface of the side plate 4 in the fixed box body 10 through a plurality of bolts;
s4, fixing the vertical part of the angle connecting piece 9 in the groove of the lever 8 through a plurality of bolts;
s5, connecting the upper loading component 1 with the upper end of the fixed box body 10 through the pin 2, and connecting the lower loading component 5 with the lower end of the lever 8 through the pin 2 to complete the assembly of the whole set of clamp;
s6, fixing the loading assembly (upper loading assembly and lower loading assembly) on the fatigue testing machine 7 through a hydraulic chuck;
s7 starts fatigue testing machine 7 to test.
The box 10 and the lever 8 connected with the angle connector move along with the displacement of the upper loading assembly 1 and the lower loading assembly 5 in the loading process, and as shown in figure 1, the actual stress state of the angle connector on an airplane is correctly simulated. In addition, in order to improve the safety of the invention, the edges of the clamp are provided with fillets.
Claims (6)
1. The utility model provides a fatigue test anchor clamps suitable for typical angular connector of bulkhead which characterized in that: the loading device comprises a fixed box body (10), a side plate (4), a lever (8) and a loading mechanism, wherein the fixed box body (10) is vertically connected with the lever (8); the horizontal part of the angular connecting piece (9) and the side plate (4) are fixedly connected in the fixed box body (10) from bottom to top, and the side plate (4) is fixedly connected with the horizontal part of the angular connecting piece (9); the lever (8) is provided with a groove, and the vertical part of the angle-shaped connecting piece (9) is fixed in the groove; the loading mechanism comprises an upper loading assembly (1) and a lower loading assembly (5), the upper loading assembly (1) is rotatably connected with the fixed box body (10), and the lower loading assembly (5) is rotatably connected with the lever (8).
2. A fatigue test fixture for bulkhead typical angle connectors according to claim 1, wherein: one side of the horizontal part of the angle connecting piece (9) is fixedly connected with the side surface of the fixed box body (10), and the other side of the horizontal part of the angle connecting piece (9) is fixedly connected with the side plate (4); one side of the vertical part of the angle connecting piece (9) is fixedly connected with the side surface of the lever (8).
3. A fatigue test fixture suitable for bulkhead typical angle connectors according to claim 1 or 2, wherein: the side plate (4) comprises a bottom surface and a side surface, the bottom surface of the side plate (4) is fixedly connected with the fixed box body (8), and the side surface of the side plate (4) is fixedly connected with the horizontal part of the angle-shaped connecting piece (9).
4. A fatigue test fixture for bulkhead typical angle connectors according to claim 1, wherein: the upper loading assembly (1) is connected with the fixed box body (10) through the pin (2), the lower loading assembly (5) is connected with the lever (8) through the pin (2), and bearings are arranged in pin holes of the upper loading assembly (1) and the lower loading assembly (5).
5. The use method of the fatigue test fixture suitable for the bulkhead typical angle connector in claim 1 is characterized in that: the method comprises the following steps:
s1, the horizontal part of the angle connector (9) is placed in the fixed box body (10) and is fixedly connected with the fixed box body (10);
s2, the side plate (4) is fixedly connected with the horizontal part of the angle connector (9) and is fixed in the fixed box body (10);
s3, fixing the vertical part of the angle connecting piece (9) in the groove of the lever (8);
s4, the upper loading component (1) is rotationally connected with the fixed box body (10), and the lower loading component (5) is rotationally connected with the lever (8);
s5, fixing the upper loading assembly (1) and the lower loading assembly (5) on the experiment machine through hydraulic chucks;
s6 starts the tester to test.
6. Use of a fatigue test fixture for bulkhead typical angle connectors according to claim 5, characterized by: in step S1, the horizontal part side of the angle connector (9) is fixedly connected with the side surface of the fixed box body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910383900.1A CN111558907A (en) | 2019-05-08 | 2019-05-08 | Fatigue test clamp for typical angle-shaped connecting piece of bulkhead and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910383900.1A CN111558907A (en) | 2019-05-08 | 2019-05-08 | Fatigue test clamp for typical angle-shaped connecting piece of bulkhead and using method |
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|---|---|
| CN111558907A true CN111558907A (en) | 2020-08-21 |
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| CN201910383900.1A Pending CN111558907A (en) | 2019-05-08 | 2019-05-08 | Fatigue test clamp for typical angle-shaped connecting piece of bulkhead and using method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080039087A (en) * | 2006-10-31 | 2008-05-07 | (재)대구기계부품연구원 | Jig device for fixing a piece in the fatigue testing machine |
| CN103278383A (en) * | 2013-05-16 | 2013-09-04 | 东南大学 | Testing device for compound type cracking of asphalt mixture |
| CN106442167A (en) * | 2016-09-21 | 2017-02-22 | 中国商用飞机有限责任公司 | Metal web pure shear fatigue test device |
| KR101954830B1 (en) * | 2018-07-27 | 2019-03-06 | 목포대학교산학협력단 | Out-of-plane bending test equipment of L-shape scaffold and That test method |
| CN210616260U (en) * | 2019-05-08 | 2020-05-26 | 沈阳盛远检测技术有限公司 | Fatigue test fixture for typical angle-shaped connecting piece of bulkhead |
-
2019
- 2019-05-08 CN CN201910383900.1A patent/CN111558907A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080039087A (en) * | 2006-10-31 | 2008-05-07 | (재)대구기계부품연구원 | Jig device for fixing a piece in the fatigue testing machine |
| CN103278383A (en) * | 2013-05-16 | 2013-09-04 | 东南大学 | Testing device for compound type cracking of asphalt mixture |
| CN106442167A (en) * | 2016-09-21 | 2017-02-22 | 中国商用飞机有限责任公司 | Metal web pure shear fatigue test device |
| KR101954830B1 (en) * | 2018-07-27 | 2019-03-06 | 목포대학교산학협력단 | Out-of-plane bending test equipment of L-shape scaffold and That test method |
| CN210616260U (en) * | 2019-05-08 | 2020-05-26 | 沈阳盛远检测技术有限公司 | Fatigue test fixture for typical angle-shaped connecting piece of bulkhead |
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