CN109484672B - Go up wall end and wallboard and connect whole angle box subassembly - Google Patents
Go up wall end and wallboard and connect whole angle box subassembly Download PDFInfo
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- CN109484672B CN109484672B CN201811458948.6A CN201811458948A CN109484672B CN 109484672 B CN109484672 B CN 109484672B CN 201811458948 A CN201811458948 A CN 201811458948A CN 109484672 B CN109484672 B CN 109484672B
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- 239000002131 composite material Substances 0.000 claims abstract description 70
- 238000005304 joining Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 15
- 230000003014 reinforcing effect Effects 0.000 description 11
- 239000010959 steel Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- 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)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Casings For Electric Apparatus (AREA)
- Finishing Walls (AREA)
- Connection Of Plates (AREA)
Abstract
The invention belongs to the field of aircraft strength tests, and particularly relates to an integral corner box assembly with an upper wall end connected with a wallboard; the connecting integral corner box assembly includes: an external corner box for fixing the composite material test piece; a plurality of internal independent small angle boxes used for being matched with the external angle boxes to fix the composite material test piece; the external corner box is arranged on the outer side of the composite material test piece wallboard; the plurality of internal independent small angle boxes are symmetrically arranged on the inner side of the composite material test piece wallboard; the outer corner box and the inner independent small corner boxes are symmetrically arranged. The integral corner box assembly improves the structural details of the corner box connected with the upper wall end and the wallboard according to the performance difference of the composite material and the metal material, improves the force transmission effect between the metal corner box and the composite material wallboard, and eliminates the potential risk of damaging the test piece. Simultaneously, the two ends of the corner box are respectively provided with a notch, so that the effects of reducing weight and being more coordinated with the front and rear beam corner boxes are achieved.
Description
Technical Field
The invention belongs to the field of aircraft strength tests, and particularly relates to an integral corner box assembly with an upper wall end connected with a wallboard.
Background
The typical box section test piece of the composite wing and the full-size box section test piece are connected through the upper wall end and the test support tool and the bearing wall. The upper wall end metal corner box is arranged on the inner and outer parts of the upper wall plate, the lower wall plate and the front beam and the rear beam of the clamping end of the test piece, wherein the outer parts are four integral large corner boxes, and the inner parts are discrete independent small corner boxes. At present, two integral metal corner boxes arranged outside the upper wall plate and the lower wall plate are designed to have equal thickness in the expanding direction, the expanding direction is reinforced by vertical ribs, and the position of each vertical rib corresponds to the internal stringer. The cut-off position of the whole big angle box is the same as the cut-off position of the internal small angle box, the existing upper wall end connection angle box adopts a whole machine and stainless steel structure, the whole angle box connected with the upper wall plate and the lower wall plate adopts a spreading direction equal thickness structure, 4 rows of common bolts are used for connection, and a vertical rib is designed at the position corresponding to the internal stringer for reinforcement. The existing upper wall end integral corner box is simple in structural design and easy to manufacture, but has the following defects: the existing metal integral angle box is designed to have equal thickness, so that the rigidity change at the cut-off position of the angle box in the connecting area of the assembled metal angle box and the composite material wallboard is overlarge, and the adjacent stringers are easy to be debonded; and the cut-off positions of the external integral large-angle box and the internal small-angle box are the same, so that the rigidity mutation condition of the metal angle box and the composite material test piece at the cut-off position is further aggravated, and the composite material test piece at the position is more likely to be layered, debonded and the like.
In addition, the design of the traditional upper wall clamping end is considered to be a non-checking area, the design details of the angle box are not optimized generally, namely, the angle box structure with equal thickness and equal length is easy to cause the conditions of uneven load transmission, load level, distortion of real working conditions and the like in the area of the test piece close to the clamping end.
Disclosure of Invention
In order to solve the problems, the invention provides an integral corner box assembly for connecting an upper wall end with a wallboard, wherein the integral corner box assembly considers the specificity of a composite material test piece, improves the structural details of the corner box for connecting the upper wall end with the wallboard according to the performance difference of a composite material and a metal material, improves the force transmission effect between the metal corner box and the composite material wallboard, and eliminates the potential risk of damaging the test piece. Simultaneously, the two ends of the corner box are respectively provided with a notch, so that the effects of reducing weight and being more coordinated with the front and rear beam corner boxes are achieved.
The invention is realized by the following technical scheme:
an upper wall end and wallboard connection integral corner box assembly, the connection integral corner box assembly is used for combined material box section test, the connection integral corner box assembly includes:
an external corner box for fixing the composite material test piece;
a plurality of internal independent small angle boxes used for being matched with the external angle boxes to fix the composite material test piece;
the external corner box is arranged on the outer side of the composite material test piece wallboard;
the plurality of internal independent small angle boxes are symmetrically arranged on the inner side of the composite material test piece wallboard;
the outer corner box and the inner independent small corner boxes are symmetrically arranged.
Further, the first cut-off region of the outer corner box on the composite material test piece is provided with a variable thickness step structure, so that rigidity change between the first cut-off region and the composite material test piece is slowed down.
Further, the second cut-off region of the internal independent small angle box on the composite material test piece is arranged to be of a variable thickness step structure, so that rigidity change between the second cut-off region and the composite material test piece is slowed down.
Further, the number of the inner independent small corner boxes matched with one outer corner box is at least 2.
Further, the outer corner box is made of metal.
Further, the inner independent corner box is metal.
Further, the metal material includes aluminum alloy, steel, and titanium alloy.
Further, the steel includes alloy steel including 45# steel and 30CrMnSi steel.
Further, the variable thickness step structure refers to a region (namely the root of the corner box) with larger thickness from the corner box (the outer corner box or the inner independent small corner box) close to the direction of the bearing wall, and gradually transits to a region (a first cut-off region or a second cut-off region) with smaller thickness close to the cut-off end after at least two steps are thinned, so that the rigidity change between the corner box of the cut-off region and the composite material test piece is slowed down.
Further, the variable thickness step structure optimizes the force transmission of the outer corner box or the inner independent small corner box through the gradual decrease of the thickness of the outer corner box or the inner independent small corner box, and avoids stress concentration at the cut-off position of the corner box; the first step is thinned, the thickness of the step is 70% -80% of the original thickness of the external corner box or the internal independent small corner box, and the second step is thinned, the thickness of the step is 40% -50% of the original thickness of the external corner box or the internal independent small corner box.
Further, the outer corner box is L-shaped, and the variable-thickness step structure is arranged on one side or two sides of the L-shaped.
Further, the inner independent small corner box is L-shaped, and the variable thickness step structure is arranged on one side or two sides of the L-shaped.
Further, when the external corner box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shaped box.
Further, when the shape of the internal independent small-angle box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shaped box.
Further, the reinforcing ribs are triangular in shape.
Further, the length of the first cut-off area is larger than that of the second cut-off area, so that the cut-off end faces of the outer corner box and the inner independent small corner box are staggered and are not in the same line, and rigidity abrupt changes between the outer corner box and the composite material test piece are further avoided.
Further, the connection between the connecting integral corner box assembly and the composite material test piece can be gradually changed from a double-shear structure at the wing root to a single-shear structure, and the thicknesses of the outer corner box and the inner independent corner box are designed according to the modulus and the strength of the composite material test piece and the outer corner box and the inner independent corner box so as to meet the rigidity matching of the outer corner box and the inner independent corner box and the clamped composite material test piece.
Furthermore, the two ends of the outer corner box and the inner independent small corner box are provided with openings, so that the outer corner box and the outer corner box of the spar are more coordinated, and meanwhile, the weight reduction effect is achieved.
Further, the first cut-off region comprises a variable thickness step structure thinned at least 2 steps.
Further, the second cut-off region comprises a variable thickness step structure thinned at least 2 steps.
Further, the distance between the first cutoff end of the first cutoff region and the second cutoff end of the second cutoff region in the horizontal direction is not less than the length of a row of bolts; the structure can avoid overlarge rigidity change caused by the simultaneous cut-off of two metal corner boxes connected with the composite material test piece, and reduce composite material damage.
Further, the number of the bolts in the row is 12-20.
Adding a row of bolts in a single-shear connection area (namely an area where the distance between the first cut-off end and the second cut-off end in the horizontal direction) of the metal corner box and the composite material test piece, arranging the bolts according to the number of stringers, and adding 2 bolts at one stringer end; the added row of bolts optimize the nail load distribution, and can play a crack-stopping effect on the potential composite material layering damage.
It is a further object of the present invention to provide a method of joining composite section test pieces wherein the method employs an upper wall end to wall panel joining integral corner box assembly as described above to join the test piece to the upper wall end portion.
The invention has the following beneficial technical effects:
(1) In the integral corner box assembly with the upper wall end and the wall plate connected, the outer corner box and the inner independent small corner box are respectively provided with a variable thickness step structure with at least 2 steps for thinning: compared with the existing equal-thickness angle box, the structure realizes the change of the angle box in the expanding direction thickness, avoids the phenomenon of abrupt change of rigidity of a cut-off area when the angle box is connected with a composite material test piece, and reduces the damage such as debonding and the like of the composite material wallboard stringer; meanwhile, the time-varying thickness step structure also has the effect of reducing weight.
(2) The distance between the first cut-off end of the first cut-off area of the integral corner box assembly connected with the wall plate and the second cut-off end of the second cut-off area in the horizontal direction is not smaller than the length of one row of bolts: compared with the design of the upper wall end of the inner and outer metal corner boxes of the existing wallboard, which is cut off at the same position, the structure can avoid overlarge rigidity change caused by the simultaneous cut-off of the two metal corner boxes connected with the composite material test piece, and reduce composite material damage.
(3) The design of the gap at two ends of the integral corner box assembly with the upper wall end and the wall plate is as follows: compared with the existing integral corner box design, the structure can reduce assembly difficulty and simultaneously has the effect of weight reduction.
Drawings
FIG. 1 is a schematic view of a composite material test piece for connecting an upper wall end with a wall plate and connecting an integral corner box assembly according to an embodiment of the present invention.
FIG. 2 is a schematic view of an external corner box in an integral corner box assembly with an upper wall end and a wall plate according to an embodiment of the present invention.
FIG. 3 is a schematic view of the structure of an independent inner corner box of the integral corner box assembly with the upper wall end and the wall plate connected.
FIG. 4 is a schematic cross-sectional view of the connection of the outer corner box and the inner independent corner box with the composite wall panel according to the embodiment of the present invention.
Reference numerals illustrate: 1-a bearing wall; 2-test support tooling; 3-an outer corner box; 4-a composite wing box; 5-a variable thickness step structure; 6, reinforcing ribs; 7-an outer corner box; 8-an internal independent small angle box; 9-composite test piece wall plate; 10-fastener (screw) position; 11-a first cut-off zone; 12-a second cut-off zone; 13-outer corner box of spar; 14-opening.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
On the contrary, the invention is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the invention as defined by the appended claims. Further, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. The present invention will be fully understood by those skilled in the art without the details described herein.
Example 1
This embodiment proposes an upper wall end and wallboard are connected whole angle box subassembly, as shown in fig. 4, connect whole angle box subassembly and be used for combined material box section test, connect whole angle box subassembly to include:
an external corner box for fixing the composite material test piece;
a plurality of internal independent small angle boxes used for being matched with the external angle boxes to fix the composite material test piece;
the external corner box is arranged on the outer side of the composite material test piece wallboard;
the plurality of internal independent small angle boxes are symmetrically arranged on the inner side of the composite material test piece wallboard;
the outer corner box and the inner independent small corner boxes are symmetrically arranged.
The first cut-off region of the outer corner box on the composite material test piece is of a variable thickness step structure, so that rigidity change between the first cut-off region and the composite material test piece is slowed down.
The second cut-off area of the inner independent small angle box on the composite material test piece is of a variable thickness step structure, so that rigidity change between the second cut-off area and the composite material test piece is slowed down.
The external corner box is made of aluminum alloy.
The inner independent small angle box is made of aluminum alloy.
The variable thickness step structure refers to a region (namely a first cut-off region or a second cut-off region) with larger thickness from a corner box (an external corner box or an internal independent small corner box) close to the direction of the bearing wall, and gradually transits to a region with smaller thickness close to the cut-off end after at least two step thinning, so that the rigidity change between the corner box of the cut-off region and a composite material test piece is slowed down.
The thickness of the variable-thickness step structure is gradually reduced by the thickness of the outer corner box or the thickness of the inner independent small corner box, so that the force transmission of the outer corner box or the inner independent small corner box is optimized, and stress concentration at a corner box cut-off position is avoided; the first step is thinned, the thickness of the step is 70% -80% of the original thickness of the external corner box or the internal independent small corner box, and the second step is thinned, the thickness of the step is 40% -50% of the original thickness of the external corner box or the internal independent small corner box.
The external corner box is L-shaped, and the variable-thickness step structure is arranged on one side or two sides of the L-shaped.
The inner independent small-angle box is L-shaped, and the variable-thickness step structure is arranged on one side or two sides of the L-shaped.
The length of the first cut-off area is larger than that of the second cut-off area, so that the cut-off end faces of the outer corner box and the inner independent small corner box are staggered and are not on the same line, and the rigidity mutation between the metal upper wall corner box and the composite material test piece is further avoided.
The connection between the integral angle box assembly and the composite material test piece can be gradually changed from a double-shear structure at the wing root to a single-shear structure, and the thickness of the outer angle box and the thickness of the inner independent angle box are calculated and designed according to the modulus and the strength of the composite material test piece and the outer angle box and the inner independent angle box so as to meet the rigidity matching of the outer angle box and the inner independent angle box and the clamped composite material test piece.
The external corner box and the two ends of the internal independent small corner box are provided with openings, so that the external corner box is more coordinated with the external corner box of the spar, and the weight reduction effect is achieved.
The first cut-off region comprises a variable thickness step structure thinned at least 2 steps.
The second cut-off region comprises a variable thickness step structure thinned at least 2 steps.
The distance between the first cutoff end of the first cutoff region and the second cutoff end of the second cutoff region in the horizontal direction is not smaller than the length of a row of bolts; the structure can avoid overlarge rigidity change caused by the simultaneous cut-off of two metal corner boxes connected with the composite material test piece, and reduce composite material damage.
The number of the bolts in one row is 12-20.
Adding a row of bolts in a single-shear connection area (namely an area where the distance in the horizontal direction is) of the metal corner box and the composite material test piece, arranging the bolts according to the number of stringers, and adding 2 bolts at one stringer end; the added row of bolts optimize the nail load distribution, and can play a crack-stopping effect on the potential composite material layering damage.
In the integral corner box assembly with the upper wall end and the wall plate connected, the outer corner box and the inner independent small corner box are respectively provided with a variable thickness step structure with at least 2 steps for thinning: compared with the existing equal-thickness angle box, the structure realizes the change of the angle box in the expanding direction thickness, avoids the phenomenon of abrupt change of rigidity of a cut-off area when the angle box is connected with a composite material test piece, and reduces the damage such as debonding and the like of the composite material wallboard stringer; meanwhile, the time-varying thickness step structure also has the effect of reducing weight.
The distance between the first cutoff end of the first cutoff region and the second cutoff end of the second cutoff region in the horizontal direction is not less than the length of a row of bolts: compared with the design of the upper wall end of the inner and outer metal corner boxes of the existing wallboard, which is cut off at the same position, the structure can avoid overlarge rigidity change caused by the simultaneous cut-off of the two metal corner boxes connected with the composite material test piece, and reduce composite material damage.
Example 2
This example provides a method for joining composite box segments using the joined integral corner box assembly of example 1.
Example 3
The integral corner box assembly for connecting the upper wall end and the wall plate provided in the embodiment is basically the same as that in embodiment 1, except that:
the external corner box is made of 45# steel.
The inner independent small angle box is 45# steel.
Example 4
The integral corner box assembly for connecting the upper wall end and the wall plate provided in the embodiment is basically the same as that in embodiment 1, except that:
the outer corner box is made of 30CrMnSi steel.
The internal independent small angle box is made of 30CrMnSi steel.
Example 5
The integral corner box assembly for connecting the upper wall end and the wall plate provided in the embodiment is basically the same as that in embodiment 1, except that:
when the shape of the external corner box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shape.
The reinforcing ribs are triangular in shape.
Example 6
The integral corner box assembly for connecting the upper wall end and the wall plate provided in the embodiment is basically the same as that in embodiment 1, except that:
when the shape of the internal independent small-angle box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shaped box.
The reinforcing ribs are triangular in shape.
Example 7
The integral corner box assembly for connecting the upper wall end and the wall plate provided in the embodiment is basically the same as that in embodiment 1, except that:
when the shape of the external corner box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shape.
When the shape of the internal independent small-angle box is L-shaped, a plurality of reinforcing ribs are arranged between two sides of the L-shaped box.
The reinforcing ribs are triangular in shape.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (3)
1. Go up wall end and wallboard and connect whole angle box subassembly, connect whole angle box subassembly and be used for combined material box section test, its characterized in that, connect whole angle box subassembly to include:
an external corner box for fixing the composite material test piece;
a plurality of internal independent small angle boxes used for being matched with the external angle boxes to fix the composite material test piece;
the external corner box is arranged on the outer side of the composite material test piece wallboard;
the plurality of internal independent small angle boxes are symmetrically arranged on the inner side of the composite material test piece wallboard;
the outer corner box and the inner independent small corner boxes are symmetrically arranged;
the first cut-off area of the external corner box on the composite material test piece is set to be of a variable-thickness step structure;
the first cut-off region comprises a variable thickness step structure thinned at least 2 steps;
the second cut-off area of the inner independent small-angle box on the composite material test piece is set to be of a variable-thickness step structure;
the second cut-off region comprises a variable thickness step structure thinned at least 2 steps;
in the variable-thickness step structure, when the step is thinned for the first time, the thickness of the step is 70% -80% of the original thickness of the external corner box or the internal independent small corner box, and when the step is thinned for the second time, the thickness of the step is 40% -50% of the original thickness of the external corner box or the internal independent small corner box;
the length of the first cut-off of the outer corner box on the composite material test piece is greater than the length of the second cut-off region of the inner independent corner box on the composite material test piece;
the shape of the external corner box is L-shaped;
the shape of the internal independent small angle box is L-shaped.
2. An upper wall end and wall panel connection integral corner box assembly according to claim 1 wherein said outer corner box variable thickness step structure is provided on one or both sides of the L-shape;
the inner independent small-angle box variable-thickness step structure is arranged on one side or two sides of the L shape.
3. A method of joining composite section test pieces, wherein the method uses an upper wall end to wall panel joining integral corner box assembly according to claim 1 or 2 to join test pieces to upper wall end portions.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458948.6A CN109484672B (en) | 2018-11-30 | 2018-11-30 | Go up wall end and wallboard and connect whole angle box subassembly |
| PCT/CN2018/120274 WO2020107531A1 (en) | 2018-11-30 | 2018-12-11 | Upper wall end and wall plate connection integral corner box assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458948.6A CN109484672B (en) | 2018-11-30 | 2018-11-30 | Go up wall end and wallboard and connect whole angle box subassembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109484672A CN109484672A (en) | 2019-03-19 |
| CN109484672B true CN109484672B (en) | 2024-01-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811458948.6A Active CN109484672B (en) | 2018-11-30 | 2018-11-30 | Go up wall end and wallboard and connect whole angle box subassembly |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109484672B (en) |
| WO (1) | WO2020107531A1 (en) |
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- 2018-11-30 CN CN201811458948.6A patent/CN109484672B/en active Active
- 2018-12-11 WO PCT/CN2018/120274 patent/WO2020107531A1/en active Application Filing
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| Publication number | Publication date |
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| WO2020107531A1 (en) | 2020-06-04 |
| CN109484672A (en) | 2019-03-19 |
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