CN107471756A - A kind of sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face - Google Patents
A kind of sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face Download PDFInfo
- Publication number
- CN107471756A CN107471756A CN201710703383.2A CN201710703383A CN107471756A CN 107471756 A CN107471756 A CN 107471756A CN 201710703383 A CN201710703383 A CN 201710703383A CN 107471756 A CN107471756 A CN 107471756A
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- sandwich
- ripple
- panel
- hyperbolic
- safeguard structure
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- 238000000034 method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 6
- 230000035939 shock Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 abstract 3
- 239000011229 interlayer Substances 0.000 abstract 2
- 238000010521 absorption reaction Methods 0.000 description 8
- 239000011381 foam concrete Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001456 electron microprobe Auger spectroscopy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010068052 Mosaicism Diseases 0.000 description 1
- 101710144202 Probable soluble pyridine nucleotide transhydrogenase Proteins 0.000 description 1
- 101710165942 Soluble pyridine nucleotide transhydrogenase Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 210000003765 sex chromosome Anatomy 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2571/00—Protective equipment
Landscapes
- Road Paving Structures (AREA)
Abstract
The present invention discloses a kind of sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face, and the interlayer structure includes upper strata panel, ripple sandwich layer and lower floor's panel.Different from traditional interlayer structure, its laminboard layer is hyperbolic ripple struction, the sine bellows shape profile orthogonal along the horizontal and vertical presentation of structure, the hyperbolic ripple filled board of different geometries can be constructed by adjusting amplitude, cycle and the accumulation number of plies of hyperbolic ripple sandwich of layers.The present invention proposes a kind of shock resistance energy absorbing structure; airfield runway end can be layed in; when aircraft is due to unexpected gun off the runway; roll hyperbolic ripple filled board by wheel and produce to be plastically deformed makes it smoothly slow down rapidly to absorb the impact energy of aircraft, so as to protect the safety of occupant.
Description
Technical field
The present invention relates to a kind of emergent stop formation of aviation, is that a kind of hyperbolic ripple blocked applied to aircraft road face is sandwich
Safeguard structure, it is that a kind of aircraft road face arresting system that is applied to possesses shock resistance, the hyperbolic ripple folder of buffering energy-absorbing specifically
Core.
Background technology
With increase of the modern humans to aviation transport demand, the accident that aircraft guns off the runway happens occasionally, last decade
Statistics show that the gun off the runway number at end of aircraft increases year by year, serious prestige is produced to aircraft and occupant safety
The side of body.International Civil Aviation Organization provides to must be provided with 300m runway end safety area.But many airports are limited to Adjacent Buildings, waters
Runway can not be extended etc. the limitation of landform, runway end safety area is set without sufficient space, forms very big potential safety hazard.
In light of this situation, international flight person federation suggests installing a kind of engineering material arresting system (Engineered Material
Arresting System, EMAS) to block stop runaway aircraft.Usual EMAS is made up of light foam concrete, is laid
In airfield runway end.After aircraft guns off the runway into foam concrete, the foam concrete can under the rolling of wheel
Quick fragmentation forms conquassation resistance, aircraft is steadily slowed down and is finally stopped, realizes the safety barrage of aircraft.But foam coagulation
Soil have that easy to aging, water resistance is poor and conquassation after the problem of producing a large amount of dust.
In addition, corrugated sandwich board widely should so that its specific strength is high, specific stiffness is big, shock resistance and the advantages that endurance
Used in engineering fields such as Aero-Space, ship, bullet trains.It is mainly by upper and lower skin panel and middle ripple laminboard layer structure
Into being typically combined by direct bonded process or prepreg solidify afterwards method.Traditional ripple filled board mainly includes triangle
Shape corrugated plating, trapezoidal corrugated plating and sine card, but these battenboards can not meet the suction that aircraft road face is blocked
It can require and it has typical anisotropic properties.
Therefore, how solve foamed concrete material aging, durability and the problems such as environment on the premise of increase ripple
The energy absorption efficiency of structure, it is to improve the task of top priority to the aircraft arrestment protection safety that guns off the runway.
The content of the invention
It is contemplated that improving the security protection ability effectively blocked to the aircraft that guns off the runway, propose that one kind is applied to aircraft
The sandwich safeguard structure of hyperbolic ripple that road face is blocked, runway end lights is layed in along airfield runway direction level, when aircraft goes out race
Conquassation ripple struction absorbs aircraft kinetic energy behind road, meets the energy absorbing demands of aircraft road face arresting system, protects aircraft passenger
Life security.
A kind of sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face of the present invention, is followed successively by upper strata from top to bottom
Panel, middle battenboard and lower floor's panel；It is in sine bellows shape that middle battenboard is horizontal and vertical, and transverse wave direction with
Longitudinal ripple direction is orthogonal.Connected between middle battenboard and upper strata panel and lower floor's panel by prepreg solidify afterwards.
Further increase its structure than energy-absorbing to improve the energy absorption characteristics of this hyperbolic corrugated sandwich board structure, can adopt
With accumulation mode, battenboard among more than 1 can be set between upper strata panel and lower floor's panel, and between adjacent middle battenboard on
Under it is oppositely arranged.Connected between intermediate course again by prepreg solidify afterwards.
Panel, lower floor's panel material and middle battenboard use aluminum alloy materials or steel to the present invention at the middle and upper levels, use
It is prepared by cold-rolling process method；Middle battenboard is prepared using 3D printing technique.
It can be also designed with the connecting hole in transverse and longitudinal direction on upper strata panel and lower floor's panel, screw can be passed through in the present invention
And connecting plate realizes the connection between the adjacent sandwich safeguard structure of hyperbolic ripple.
The advantage of the invention is that：
1st, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, different from traditional ripple sandwich
Harden structure, its along structure it is horizontal and vertical in sine bellows shape and transverse wave direction it is orthogonal with longitudinal ripple direction, because
This structure has isotropism attribute.
2nd, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, can be by changing ripple struction
Amplitude, cycle, thickness and the accumulation number of plies adjust the basic mechanical characteristic of structure, construct the structure of different-energy absorbability
To meet the requirement of different model aircraft arrestment.
3rd, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, and can ensure water in sleety weather
Flow the unimpeded timely draining in direction, avoid rainwater or accumulated snow accumulate and caused by water-fast sex chromosome mosaicism.
4th, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, different from conventional use of foam
The preparation technology of concrete material, hyperbolic laminboard layer and upper and lower skin panel is comparatively succinct, environmental protection, will not produce any
Waste water and waste liquid reduces the adverse effect to environment.
5th, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, as a kind of high specific strength, ratio
Rigidity, shock proof Sandwich structure can be widely applied to the engineering fields such as Aero-Space, ship and automobile.
6th, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, and has used traditional metal material
Preparation method is relatively easy, avoids aging existing for currently used foam concrete, poor durability and pollution environment
Problem, it is more suitable for aircraft road face arrestor.
7th, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that blocks of aircraft road face, triangle compared to routine,
The corrugated sandwich board structure of sinusoidal pattern has higher energy absorption efficiency.
8th, the present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, and is bonded with each other by connecting plate,
For the hyperbolic ripple struction of the deformation of conquassation, quick-replaceable operation can be achieved.
Brief description of the drawings
Fig. 1 is the sandwich safeguard structure schematic diagram of hyperbolic ripple of the present invention；
Fig. 2 is the middle Sandwich structure schematic diagram of the sandwich safeguard structure of hyperbolic ripple of the present invention；
Fig. 3 is the sandwich safeguard structure of hyperbolic ripple structural representation under accumulation mode of the present invention；
Fig. 4 is the sandwich safeguard structure assembling mode schematic diagram of hyperbolic ripple of the present invention；
Fig. 5 is the corrugated sandwich board power displacement comparison figure of triangle, sine and hyperbolic sine.
In figure：
Battenboard 3- lower floors panel among the panel 2- of 1- upper stratas
4- connecting plates
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
The present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, and is followed successively by upper strata panel from top to bottom
1st, middle battenboard 2 and lower floor's panel 3.Wherein, the thickness of upper strata panel 1 and lower floor's panel 3 is 2mm, and material is aluminium alloy,
Prepared using cold-rolling process method.The middle middle filled board 2 of battenboard 2 is hyperbolic corrugated sandwich board, equally using aluminium alloy material
Material, its length and width are 0.5m, thickness 1mm.Middle battenboard 2 is prepared using 3D printing technique, with traditional ripple
Battenboard is compared with complicated contour structures, is specially：Middle filled board 2 is horizontal and vertical to be presented the row sine bellows knot of 4 row 4
Structure, and transverse wave direction is orthogonal with longitudinal ripple direction, has isotropism attribute.Above-mentioned horizontal and vertical sine bellows
Amplitude is 0.2m；And laterally and longitudinally it is respectively provided with 4 crests.
The geometric surface configuration of above-mentioned center battenboard 2 follows below equation：
Wherein, x, y represent the abscissa along x-axis that each is put on hyperbolic corrugated surface, the ordinate along y-axis respectively.L1
And L2The length and width of battenboard 2 among respectively；nxAnd nyFor transversely and longitudinal direction crest number；F is middle battenboard
The amplitude of upper sine bellows, Z (x) are each the normal direction coordinate of point along z-axis on hyperbolic corrugated surface.Said structure parameter is substituted into
This equation can be obtained by its geometric expression formula.
Connected at each crest of the above-mentioned side of middle battenboard 2 between upper strata panel 1 by prepreg solidify afterwards, it is another
Connected at each trough of side between lower floor's panel 3 again by prepreg solidify afterwards, ensure that it is connected firmly with maximumlly
Play its energy absorption characteristics.Further increase its structure to improve the energy absorption characteristics of this hyperbolic corrugated sandwich board structure
Than energy-absorbing, accumulation mode can be used, i.e., two hyperbolic ripple laminboard layers, two folders are set between upper strata panel 1 and lower floor's panel 3
Core plate is oppositely arranged about 2.The horizontal and vertical each crest location of battenboard 2 of top, respectively with lower section corrugated sandwich board 2
Each crest location contact on horizontal and vertical, and connected by prepreg solidify afterwards, as shown in Figure 3.The battenboard 2 of top
Between upper strata panel 1, and connected between the battenboard 2 and lower floor's panel 3 of lower section again by prepreg solidify afterwards.In order to reach
Different energy absorption standards, hyperbolic ripple amplitude, cycle, thickness and the accumulation number of plies need to be reasonably selected, adjusts hyperbolic ripple
The profile of line filled board improves the energy absorption efficiency of structure.
The present invention is applied to the sandwich safeguard structure of hyperbolic ripple that aircraft road face is blocked, and is laid along airfield runway direction is horizontal
In runway end lights, conquassation ripple struction absorbs aircraft kinetic energy after aircraft guns off the runway, and meets the energy of aircraft road face arresting system
Amount, which absorbs, to be required, protects the life security of aircraft passenger.
As shown in figure 4, in the present invention on upper strata panel 1 and lower floor's panel 3, along each bar length of side direction company of being provided with equal intervals
Connect hole；Thus when laying the sandwich safeguard structure of hyperbolic ripple, between the adjacent sandwich safeguard structure of hyperbolic ripple while while connect
Put, by the connecting plate 4 of two STHs, be overlying on the adjacent sandwich safeguard structure of hyperbolic ripple and connect side edge, make the both sides of connecting plate 4
Perforate connect respectively with the adjacent sandwich safeguard structure of hyperbolic ripple side connecting hole correspond, and by screw through connection
The perforate of plate 4 realizes two pieces of sandwich protection of hyperbolic ripple with fixed after the connecting hole of the sandwich safeguard structure side of hyperbolic ripple
Interstructural fixation, form an entirety, and be easy to dismount, occur damaging when some hyperbolic ripple sandwich protective structure or
Can timely it be changed after conquassation deformation.
In addition in order to verify the hyperbolic corrugated sandwich board proposed in the present invention relative to conventional triangle and sinusoidal pattern
The advantage of corrugated sandwich board, numerical simulation study of three kinds of corrugated sandwich boards under impact loading, such as Fig. 5 have been carried out respectively
Shown result shows that the energy that is absorbed under the initial peak value load of hyperbolic sine corrugated sandwich board and equal conditions is most, so
Its energy absorption characteristics is optimal.
Claims (10)
- A kind of 1. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face, it is characterised in that：It is followed successively by from top to bottom Upper strata panel, middle battenboard and lower floor's panel；It is in sine bellows shape that middle battenboard is horizontal and vertical, and transverse wave side To orthogonal with longitudinal ripple direction.
- A kind of 2. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Middle battenboard is prepared using 3D printing technique.
- A kind of 3. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Connected between middle battenboard and upper strata panel and lower floor's panel by prepreg solidify afterwards.
- A kind of 4. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Battenboard among more than 1 is set between upper strata panel and lower floor's panel, and it is oppositely arranged up and down between adjacent middle battenboard.
- A kind of 5. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 4, it is characterised in that： Between middle battenboard, and connected between center battenboard and upper strata panel, lower floor's panel by prepreg solidify afterwards.
- A kind of 6. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Upper strata panel, lower floor's panel material and middle battenboard use aluminum alloy materials or steel.
- A kind of 7. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Upper strata panel is prepared with lower floor's panel using cold-rolling process method.
- A kind of 8. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Upper strata panel is identical with the thickness of lower floor's panel, is 1~2mm；Thickness is 0.3~0.8mm.
- A kind of 9. sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face as claimed in claim 1, it is characterised in that： Horizontal and vertical sine bellows amplitude is 0.2~0.4m.
- 10. a kind of sandwich safeguard structure of hyperbolic ripple blocked applied to aircraft road face, its feature as described in claim 1 or 4 It is：Upper strata panel is with lower floor's panel, being designed with the connecting hole in transverse and longitudinal direction, adjacent hyperbolic being realized by screw and connecting plate Connection between the sandwich safeguard structure of ripple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710703383.2A CN107471756B (en) | 2017-08-16 | 2017-08-16 | Be applied to hyperbolic ripple sandwich protective structure that aircraft pavement was blocked |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710703383.2A CN107471756B (en) | 2017-08-16 | 2017-08-16 | Be applied to hyperbolic ripple sandwich protective structure that aircraft pavement was blocked |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107471756A true CN107471756A (en) | 2017-12-15 |
| CN107471756B CN107471756B (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710703383.2A Expired - Fee Related CN107471756B (en) | 2017-08-16 | 2017-08-16 | Be applied to hyperbolic ripple sandwich protective structure that aircraft pavement was blocked |
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| Country | Link |
|---|---|
| CN (1) | CN107471756B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854939A (en) * | 2019-01-28 | 2019-06-07 | 南京航空航天大学 | A kind of 3D printing reinforcement ripple interlayer cylinder |
| CN113978045A (en) * | 2021-10-29 | 2022-01-28 | 广州大学 | Folded angle improved corrugated cell and sandwich structure thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723616A (en) * | 2015-03-17 | 2015-06-24 | 西安交通大学 | Light-weight orthogonal corrugated core sandwich composite structure and preparation method thereof |
| CN106564237A (en) * | 2016-11-03 | 2017-04-19 | 西安交通大学 | Lightweight and multi-level orthogonal corrugated core sandwich structure and preparation method thereof |
| CN106891598A (en) * | 2017-01-20 | 2017-06-27 | 西安交通大学 | A kind of wavy channel core body sandwich and preparation method thereof |
| CN106892314A (en) * | 2017-04-12 | 2017-06-27 | 北京航空航天大学 | A kind of nested pipe shock resistance multilevel energy absorption plant |
-
2017
- 2017-08-16 CN CN201710703383.2A patent/CN107471756B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723616A (en) * | 2015-03-17 | 2015-06-24 | 西安交通大学 | Light-weight orthogonal corrugated core sandwich composite structure and preparation method thereof |
| CN106564237A (en) * | 2016-11-03 | 2017-04-19 | 西安交通大学 | Lightweight and multi-level orthogonal corrugated core sandwich structure and preparation method thereof |
| CN106891598A (en) * | 2017-01-20 | 2017-06-27 | 西安交通大学 | A kind of wavy channel core body sandwich and preparation method thereof |
| CN106892314A (en) * | 2017-04-12 | 2017-06-27 | 北京航空航天大学 | A kind of nested pipe shock resistance multilevel energy absorption plant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854939A (en) * | 2019-01-28 | 2019-06-07 | 南京航空航天大学 | A kind of 3D printing reinforcement ripple interlayer cylinder |
| CN113978045A (en) * | 2021-10-29 | 2022-01-28 | 广州大学 | Folded angle improved corrugated cell and sandwich structure thereof |
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| Publication number | Publication date |
|---|---|
| CN107471756B (en) | 2019-12-10 |
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