WO2014156274A1 - 燃料タンク、主翼、航空機胴体、航空機及び移動体 - Google Patents
燃料タンク、主翼、航空機胴体、航空機及び移動体 Download PDFInfo
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- WO2014156274A1 WO2014156274A1 PCT/JP2014/051831 JP2014051831W WO2014156274A1 WO 2014156274 A1 WO2014156274 A1 WO 2014156274A1 JP 2014051831 W JP2014051831 W JP 2014051831W WO 2014156274 A1 WO2014156274 A1 WO 2014156274A1
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- WIPO (PCT)
- Prior art keywords
- fuel tank
- bolt
- aircraft
- structural member
- cfrp
- Prior art date
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- 239000002828 fuel tank Substances 0.000 title claims abstract description 42
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims abstract description 43
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 8
- 239000004917 carbon fiber Substances 0.000 claims abstract description 8
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 239000012779 reinforcing material Substances 0.000 claims abstract description 5
- 239000000565 sealant Substances 0.000 claims description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 description 12
- 239000000446 fuel Substances 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000007769 metal material Substances 0.000 description 7
- 238000003908 quality control method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000805 composite resin Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HIZCTWCPHWUPFU-UHFFFAOYSA-N Glycerol tribenzoate Chemical compound C=1C=CC=CC=1C(=O)OCC(OC(=O)C=1C=CC=CC=1)COC(=O)C1=CC=CC=C1 HIZCTWCPHWUPFU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011208 reinforced composite material Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/32—Safety measures not otherwise provided for, e.g. preventing explosive conditions
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/08—Interconnection of layers by mechanical means
-
- 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
- B32B1/00—Layered products having a non-planar shape
-
- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C3/00—Wings
- B64C3/34—Tanks constructed integrally with wings, e.g. for fuel or water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/005—Accessories not provided for in the groups B64D37/02 - B64D37/28
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/04—Arrangement thereof in or on aircraft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/02—Tanks
- B64D37/06—Constructional adaptations thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D45/00—Aircraft indicators or protectors not otherwise provided for
- B64D45/02—Lightning protectors; Static dischargers
-
- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- 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
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
-
- 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
- B32B2605/00—Vehicles
-
- 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
- B32B2605/00—Vehicles
- B32B2605/18—Aircraft
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Definitions
- the present invention relates to a fuel tank, a wing, an aircraft fuselage, an aircraft and a mobile body using a carbon fiber reinforced plastic as a structural member.
- the wing of an aircraft may be used as a fuel tank capable of containing fuel.
- a fuel tank that is integrated with the wing and has a fluid-tight structure that does not leak oil on the wing structure is called an integral tank.
- Integral tanks tend to use composites such as carbon fiber reinforced plastic (CFRP) for weight reduction purposes.
- CFRP carbon fiber reinforced plastic
- CFRP carbon fibers are used as a reinforcing material, and a synthetic resin is used as a matrix.
- Patent Document 1 is an invention of a three-dimensional fiber-reinforced resin composite material, and in order to impart conductivity to a fiber-reinforced resin composite material without impairing productivity, the ear thread has higher conductivity than the in-plane direction thread. Techniques are disclosed that are comprised of conductive materials. Patent Document 2 discloses the invention of a prepreg and a carbon fiber reinforced composite material, and discloses a technique of containing conductive particles or fibers for the purpose of combining excellent impact resistance and conductivity. There is. Further, Patent Document 3 is an invention of an improved composite material, which has conductivity and is dispersed in a polymer resin for the purpose of causing little or no increase in weight as compared with a standard composite material. Techniques for including sexual particles are disclosed.
- JP 2007-301838 A JP, 2010-280904, A JP, 2011-168792, A
- the subject mentioned above arises not only by fastening of materials made of CFRP, but also by fastening of CFRP and a metal material, and fastening of metal materials.
- it is not limited to the integral tank integrated with the wing of the aircraft, but also occurs in a fuel cell container through which fuel flows.
- the container of a fuel cell is also included in a fuel tank and demonstrated.
- the same problem arises in a mobile body such as a fuselage of an aircraft having a fuel tank and an automobile equipped with a fuel tank other than the aircraft.
- the present invention has been made in view of such circumstances, and it is possible to reduce the working time and cost in quality control and to prevent the increase in weight, fuel tank, wing, aircraft fuselage, aircraft and mobile. Intended to provide the body.
- a fuel tank according to a first aspect of the present invention includes a structural member using a carbon fiber reinforced plastic having a reinforcing material containing carbon fiber and a matrix containing plastic, and the structural member is the carbon fiber reinforced plastic
- a conductive sheet is laminated and formed between the prepregs, and fastening holes in which bolts are fastened are formed.
- the fuel tank according to the second aspect of the present invention is a sealant provided with a conductive member applied between the bolt and the fastening hole, and a structural member having a fastening hole to which the bolt is fastened is formed.
- the main wing according to the third aspect of the present invention has the fuel tank according to the first or second aspect as a structure
- the aircraft fuselage according to the fourth aspect of the present invention has the first or second aspect described above Equipped with a fuel tank pertaining to
- An aircraft according to a fifth aspect of the present invention includes the wing according to the third aspect described above or the aircraft fuselage according to the fourth aspect.
- the mobile unit according to the sixth aspect of the present invention includes the fuel tank according to the above first or second aspect.
- the management of the hole diameter when forming the bolt fastening hole can be simplified, and the working time in quality control or Cost can be reduced and weight increase can be prevented.
- FIG. 4 is a partial vertical cross-sectional view showing an upper skin and a rib according to the first embodiment of the present invention, and is a cross-sectional view cut along a line IV-IV in FIG. It is a top view which shows the flange of the rib which concerns on 1st Embodiment of this invention.
- the main wing 1 includes an upper skin 3, a lower skin 5, a front spar 7, a rear spar 9, and a plurality of ribs 11 and the like.
- the upper skin 3 and the lower skin 5 are thin plates that constitute the outer shape of the main wing 1 and also serve as an aerodynamic surface.
- the upper skin 3 and the lower skin 5 together with the front spar 7, the rear spar 9 and the stringers (not shown) receive a part of a tensile load or a compressive load acting on the main wing 1.
- the front spar 7 and the rear spar 9 are structural members that extend in the wing length direction of the main wing 1 as shown in FIG. 1 and are disposed between the upper skin 3 and the lower skin 5.
- the plurality of stringers are auxiliary members that extend in the wing length direction of the main wing 1 on the inner surface of the upper skin 3 or the lower skin 5 and are disposed between the front spar 7 and the rear spar 9.
- the rib 11 is a structural member provided in the wing width direction of the main wing 1 as shown in FIG. 1 and is disposed between the upper skin 3 and the lower skin 5. That is, the rib 11 is a structural member extending in a direction substantially orthogonal to the front spar 7 and the rear spar 9, and is a plate-like member formed in the longitudinal cross-sectional shape of the main wing 1. As shown in FIG. 1 and FIG. 2, a plurality of openings 14 are formed in the rib 11 in the longitudinal direction.
- a portion surrounded by the front spar 7, the rear spar 9, the upper skin 3 and the lower skin 5 is used as a fuel tank 13 for containing fuel.
- the fuel tank 13 has a container structure itself as a container, and is called an integral tank.
- the front spar 7, the rear spar 9, the upper skin 3, the lower skin 5 and the ribs 11 are also structural members of the fuel tank 13.
- the fuel tank 13 has a liquid-tight structure in which fuel does not leak to the outside.
- a fuel pipe (not shown) for supplying fuel to the fuel tank 13, a plurality of fuel oil meters (not shown) for detecting the amount of fuel oil, and a fuel oil meter Wiring (not shown) etc. is installed.
- CFRP Carbon fiber reinforced plastic
- the CFRP 15 is composed of a reinforcing material containing carbon fibers, a matrix containing a plastic, and the like.
- the matrix may not be provided with conductivity, or may be provided with conductivity. When conductivity is imparted to the matrix, CFRP 15 itself also has conductivity.
- the matrix includes, for example, a plastic such as a thermosetting resin such as unsaturated polyester and epoxy resin.
- a plastic such as a thermosetting resin
- various techniques of imparting conductivity to a plastic such as a thermosetting resin can be applied, and the detailed description will be omitted herein.
- a method of imparting conductivity to the matrix there are, for example, a method of incorporating conductive particles or fibers in a plastic, a method of imparting conductivity to a plastic itself, and the like.
- the conductive sheet 17 is a sheet-like member having a low electrical resistance.
- the conductive sheet 17 may be made of metal or nonmetal.
- the metal conductive sheet 17 is, for example, copper or titanium, and is in the form of a uniform sheet having no opening, a punching metal having an opening, or a mesh.
- the nonmetallic conductive sheet 17 is made of, for example, carbon fiber, and includes a non-woven fabric or a plain weave such as gauze. In addition, carbon fibers may use carbon nanotubes.
- the conductive sheet 17 is connected to a spark location provided outside the structural member, that is, a location where the lightning current finally flows.
- FIG. 3 shows the rib 11, the same applies to other members.
- all of the front spar 7, the rear spar 9, the upper skin 3, the lower skin 5 and the ribs 11 may not be formed by a structural member having CFRP 15, and metal such as aluminum alloy partially And may be formed by
- a cutting surface formed by cutting is exposed inside the fuel tank 13 in which the fuel is stored.
- the rib 11 includes the flange 11A and the web 11B or the like, the cutting surface 11a is exposed to the inside of the fuel tank 13 at the end of the flange 11A.
- the conductive sheet 17 having high conductivity is inserted into the structural member having the CFRP 15, as shown in FIG.
- the lightning current C flows from P to the structural member
- the lightning current C also flows to the conductive sheet 17 of the structural member.
- sparks are less likely to be generated on the cutting surface 11 a of the structural member.
- the lightning current C from the lightning strike point P is a CFRP part
- sparks D may be generated between the reinforcements at the end portions of the reinforcements.
- a method of applying a sealant 12 or the like to the surface or cutting surface 11a of the CFRP part and confining the generated current inside is adopted as a countermeasure against the spark.
- the application process of the sealant 12 increases the working time and cost of the manufacturing process of the fuel tank 13.
- the weight of the wing 1 is increased by the applied sealant 12.
- the conductive sheet 17 having high conductivity is inserted into the structural member having the CFRP 15, the cutting surface 11a is exposed inside the fuel tank 13. Also, generation of sparks on the cutting surface 11a of the structural member can be prevented. As a result, it is possible to eliminate the need for the sealant to be applied to the surface of the structural member or the cutting surface 11a, and to simplify the method of applying the sealant. Therefore, the working time and the cost can be reduced in the manufacturing process of the fuel tank and the quality control of the sealant application. In addition, the weight of the sealant can be reduced.
- the structural member having the CFRP 15 is formed with a fastening hole 22 in which the bolt 20 is fastened. Then, the conductive sealant 23 having conductivity is applied to the bolt 20, and the bolt 20 is inserted into the fastening hole 22. As a result, the conductive sealant 23 is installed between the bolt 20 and the fastening hole 22.
- the structural member having the CFRP 15 and the metal material 30 are firmly fixed to each other by being tightened by the bolt 20 and the nut 21.
- the method of manufacturing the electroconductive sealant 23 can apply various techniques which provide electroconductivity to a sealant, and abbreviate
- the electrical resistance between the bolt 20 and the structural member having the CFRP 15 is reduced by electrically contacting the bolt 20 with the above-described conductive sheet 17 via the conductive sealant 23.
- the conical hole corresponding to the plate portion of the bolt 20 is formed in the fastening hole 22 and the structural member is formed so that the conductive sheet 17 is positioned in the opening portion, the bolt 20 and the conductive sheet 17 are formed. The distance between the two becomes shorter. In this case, the resistance between the bolt 20 and the structural member having the CFRP 15 can be reliably reduced.
- the invention is not limited to the case where the conductive sealant 23 is installed between the bolt 20 and the fastening hole 22, and there may be a region where the conductive sealant 23 is not installed between the bolt 20 and the fastening hole 22.
- the physical contact between the bolt 20 and the conductive sheet 17 described above makes it possible to reduce the resistance between the bolt 20 and the structural member having the CFRP 15, thereby generating a spark at the time of lightning strike. It can be reduced or prevented. Therefore, as in the conventional case, the formation of the hole diameter for gap fitting becomes unnecessary, the management of the hole diameter in forming the bolt fastening holes can be simplified, the working time and cost in quality control are reduced, and the weight Can be prevented. In addition, since it is not necessary to use the sleeve bolt, there is no reduction in strength, and weight reduction can be achieved when the same strength is to be ensured.
- the test body was produced about each of 1st Embodiment of this invention and a prior art example, and the result of having implemented the lightning-proof test is demonstrated.
- the structural member including the CFRP in which the conductive sheet 17 having conductivity is laminated (in the present embodiment) and the CFRP in which the conductive sheet 17 is not laminated (conventional)
- the test method of the lightning resistance test was according to the description of Conducted Current Test of Aircraft Lightning Test Methods (ARP 5416) of SAE international.
- the large current waveform applied to the test body is a component A waveform of the lightning simulation current specified in the ARP 5412A.
- FIG. 8 shows relative spark generation current [%] in each test body.
- the spark generation current values of the respective test pieces are shown in proportion when the spark generation current value of CFRP in which the conductive sheet is not laminated is 100%.
- the relative spark generation current is increased, and generation of spark due to lightning current at the time of lightning strike can be suppressed as compared to CFRP in which the conductive sheet 17 is not laminated.
- the relative spark generation current is substantially the same value, and at least one conductive sheet 17 is laminated on CFRP, thereby achieving the time of lightning strike. It was confirmed that generation of sparks caused by lightning current can be suppressed.
- the present invention is not limited to this example.
- the present invention can be applied to a structural member used for a container (fuel tank) of a fuel cell through which fuel flows.
- the present invention is also applicable to a structural member of a fuel tank installed in a fuselage of an aircraft, and a structural member of a fuel tank mounted on a movable body such as an automobile other than the aircraft.
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Fuel Cell (AREA)
Abstract
Description
また、スリーブボルトを使用する場合は、スリーブが挿入される孔の周りの材料を破損させながらスリーブを取り付けることになるため、強度が通常のボルトを使用する場合よりも弱まる。また、スリーブによって重量が増加する。
[第1実施形態]
まず、本実施形態に係る航空機の主翼1の構成について説明する。
主翼1は、図1及び図2に示すように、上側スキン3と、下側スキン5と、前側スパー7と、後側スパー9と、複数のリブ11などを備える。
上側スキン3及び下側スキン5は、主翼1の外形を構成し、空力面も兼ねる薄板である。上側スキン3及び下側スキン5は、前側スパー7、後側スパー9及びストリンガ(図示せず。)と共に主翼1に作用する引っ張り荷重や、圧縮荷重の一部を受け持つ。
燃料タンク13の構造部材、すなわち、前側スパー7、後側スパー9、上側スキン3、下側スキン5及びリブ11は、炭素繊維強化プラスチック(CFRP)が用いられる。そして、燃料タンク13に適用される本実施形態の構造部材は、製造時において、CFRP15のプリプレグ間に導電性シート17が積層されて成形される。したがって、構造部材は、図3に示すように、CFRP15と導電性シート17による積層構造を有する。
なお、導電性シート17には、CFRP15の炭素と接触することによって電池を形成する金属、例えば、ニッケルやアルミニウムを用いることは望ましくない。
CFRP15を有する構造部材は、ボルト20が締結される締結孔22が形成されている。そして、ボルト20には導電性を有する導電性シーラント23が塗布されて、ボルト20が締結孔22に挿入される。その結果、ボルト20と締結孔22との間には導電性シーラント23が設置される。
CFRP15を有する構造部材と金属材料30は、ボルト20とナット21によって締め付けられることによって、互いに強固に固定される。なお、導電性シーラント23を製造する方法は、シーラントに導電性を付与する様々な技術を適用することができ、本明細書では詳細な説明を省略する。
また、導電性シーラント23がボルト20と締結孔22との間に設置される場合に限定されず、ボルト20と締結孔22との間に導電性シーラント23が設置されない領域が生じる場合もある。この場合、ボルト20と上述した導電性シート17とが物理的に接触することによって、ボルト20とCFRP15を有する構造部材との間の抵抗を小さくすることができ、着雷時のスパークの発生を低減又は防止できる。
したがって、従来のように、隙間ばめのための孔径の形成が不要になり、ボルトの締結孔を形成する際の孔径の管理を簡略化でき、品質管理における作業時間やコストを低減し、重量の増加を防止することができる。また、スリーブボルトの使用もしなくてよいため、強度低下がなく、同じ強度を確保しようとする場合、より軽量化を図ることができる。
本試験では、導電性を有する導電性シート17が積層されたCFRPを備える構造部材(本実施形態)と、導電性シート17が積層されていないCFRP(従来)とにおいて、試験体に大電流波形を印加してスパークが発生する電流値の違いを比較した。
耐雷試験の試験方法は、SAE internationalのAircraft Lightning Test Methods(ARP5416)のConducted Current Testの記載に従った。試験体に印加した大電流波形は、ARP5412Aに規定される雷模擬電流のコンポーネントA波形である。
試験結果によれば、本実施形態に係る試験体は、相対スパーク発生電流が高くなり、導電性シート17が積層されていないCFRPに比べて、着雷時の雷電流によるスパークの発生を抑制できることが確認された。
また、積層するシートの枚数が1枚、4枚のいずれの場合でも、相対スパーク発生電流がほぼ同値であり、少なくとも1枚の導電性シート17がCFRPに積層されることによって、着雷時の雷電流によるスパークの発生を抑制できることが確認された。
3 上側スキン
5 下側スキン
7 前側スパー
9 後側スパー
11 リブ
11a 切削面
11A フランジ
11B ウェブ
12 シーラント
13 燃料タンク
15 CFRP
17 導電性シート
Claims (6)
- 炭素繊維を含む補強材と、プラスチックを含むマトリックスとを有する炭素繊維強化プラスチックを用いた構造部材を備え、
前記構造部材は、前記炭素繊維強化プラスチックのプリプレグ間に導電性シートが積層され成形されており、ボルトが締結される締結孔が形成されている燃料タンク。 - ボルトが締結される締結孔が形成された構造部材と、
前記ボルトと前記締結孔との間に塗布された導電性が付与されているシーラントと、
を備える燃料タンク。 - 請求項1又は2に記載の燃料タンクを構造体とする主翼。
- 請求項1又は2に記載の燃料タンクを備える航空機胴体。
- 請求項3に記載の主翼、又は、請求項4に記載の航空機胴体を備える航空機。
- 請求項1又は2に記載の燃料タンクを備える移動体。
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US14/780,156 US20160052638A1 (en) | 2013-03-26 | 2014-01-28 | Fuel tank, main wings, aircraft fuselage, aircraft, and moving body |
CA2907845A CA2907845C (en) | 2013-03-26 | 2014-01-28 | Fuel tank, main wings, aircraft fuselage, aircraft, and moving body |
EP14776202.5A EP2979977B1 (en) | 2013-03-26 | 2014-01-28 | Fuel tank, main wings, aircraft fuselage, aircraft, and moving body |
CN201480018287.9A CN105102319B (zh) | 2013-03-26 | 2014-01-28 | 燃油箱、主翼、航空机机身、航空机以及移动体 |
RU2015140425A RU2641404C2 (ru) | 2013-03-26 | 2014-01-28 | Топливный бак, основные крылья, корпус летательного аппарата, летательный аппарат и транспортное средство |
BR112015024865A BR112015024865A8 (pt) | 2013-03-26 | 2014-01-28 | tanque de combustível, asas principais, fuselagem da aeronave, aeronave e estrutura móvel |
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JP2013064444A JP6113544B2 (ja) | 2013-03-26 | 2013-03-26 | 燃料タンク、主翼、航空機胴体、航空機及び移動体 |
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JP6778221B2 (ja) * | 2018-01-15 | 2020-10-28 | 株式会社Subaru | 締結構造 |
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US20160052638A1 (en) | 2016-02-25 |
EP2979977B1 (en) | 2018-08-15 |
BR112015024865A8 (pt) | 2019-12-17 |
CN105102319B (zh) | 2018-09-28 |
JP6113544B2 (ja) | 2017-04-12 |
EP2979977A4 (en) | 2016-12-14 |
RU2641404C2 (ru) | 2018-01-17 |
EP2979977A1 (en) | 2016-02-03 |
CA2907845C (en) | 2018-02-13 |
CA2907845A1 (en) | 2014-10-02 |
BR112015024865A2 (pt) | 2017-07-18 |
JP2014189070A (ja) | 2014-10-06 |
RU2015140425A (ru) | 2017-04-27 |
CN105102319A (zh) | 2015-11-25 |
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