JP4928403B2 - Structure for preventing delamination of sandwich panels - Google Patents
Structure for preventing delamination of sandwich panels Download PDFInfo
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- JP4928403B2 JP4928403B2 JP2007252611A JP2007252611A JP4928403B2 JP 4928403 B2 JP4928403 B2 JP 4928403B2 JP 2007252611 A JP2007252611 A JP 2007252611A JP 2007252611 A JP2007252611 A JP 2007252611A JP 4928403 B2 JP4928403 B2 JP 4928403B2
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- 230000032798 delamination Effects 0.000 title description 3
- 239000006260 foam Substances 0.000 claims description 76
- 239000000463 material Substances 0.000 claims description 60
- 239000003733 fiber-reinforced composite Substances 0.000 claims description 26
- 229920003002 synthetic resin Polymers 0.000 claims description 14
- 239000000057 synthetic resin Substances 0.000 claims description 14
- 230000001154 acute effect Effects 0.000 claims description 7
- 239000000835 fiber Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000000945 filler Substances 0.000 description 5
- 239000012783 reinforcing fiber Substances 0.000 description 5
- 239000012792 core layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 239000004697 Polyetherimide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920001601 polyetherimide Polymers 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
本発明は、発泡合成樹脂から成る発泡コアとその表面に積層して一体的に形成される面板との間の剥離の進展を防止して、面板が発泡コアから剥離することを防止するサンドイッチパネルの剥離進展防止構造に関する。 The present invention provides a sandwich panel that prevents the peeling of the face plate from the foam core by preventing the progress of peeling between the foam core made of the synthetic foam resin and the face plate laminated and integrally formed on the surface of the foam core. The present invention relates to a structure for preventing delamination progress.
近年、航空機の機体を形成する構造材料として、発泡コアサンドイッチパネル（Foam
Core Sandwich Panel）が用いられている。この発泡コアサンドイッチパネルは、発泡合成樹脂から成る発泡コアに繊維強化複合材料から成る面板を積層して一体成形され、ハニカムコアサンドイッチパネルのように水浸入の問題がなく、軽量化および部品点数の削減を図る上で有効なパネル材として用いられている。
In recent years, foam core sandwich panels (Foam) have been used as structural materials for aircraft aircraft.
Core Sandwich Panel) is used. This foam core sandwich panel is integrally formed by laminating a face plate made of fiber reinforced composite material on a foam core made of foamed synthetic resin, and there is no problem of water ingress like the honeycomb core sandwich panel. It is used as an effective panel material for reduction.
図８は従来技術の発泡コアサンドイッチパネル１の構造を示す一部の断面図であり、図９は図８に示す発泡コアサンドイッチパネル１のコア層２の先端部３ａ付近の拡大断面図である。発泡コアサンドイッチパネル１は、面方向に複数の発泡コア２ａ，２ｂが隣接してコア層２を構成し、コア層２の前記面方向に垂直な厚み方向一方側の表面および厚み方向他方側の表面には、面板４ａ，４ｂがそれぞれ積層されて一体的に形成される。前記発泡コア２ａ，２ｂは、フォームコアとも呼ばれ、発泡合成樹脂から成る。また、前記各面板４ａ，４ｂは、繊維強化複合材料から成る。 FIG. 8 is a partial cross-sectional view showing the structure of the prior art foam core sandwich panel 1, and FIG. 9 is an enlarged cross-sectional view of the vicinity of the tip 3a of the core layer 2 of the foam core sandwich panel 1 shown in FIG. . In the foam core sandwich panel 1, a plurality of foam cores 2a and 2b are adjacent to each other in the surface direction to form the core layer 2, and the surface of one side in the thickness direction perpendicular to the surface direction of the core layer 2 and the other side in the thickness direction. On the surface, face plates 4a and 4b are laminated and formed integrally. The foam cores 2a and 2b are also called foam cores and are made of foam synthetic resin. Each of the face plates 4a and 4b is made of a fiber reinforced composite material.
前述の発泡コアサンドイッチパネル１において、各発泡コア２ａ，２ｂは、各面板４ａ，４ｂと発泡コア２ａ，２ｂとの剥離を防止するため、各面板４ａ，４ｂ間にわたってアレスタ５が設けられる。このアレスタ５は、鋭角に加工された発泡コア２ａ，２ｂの先端部３ａ，３ｂを覆う折曲げ部７と、折曲げ部７から各面板４ａ，４ｂに沿って延びる面板部８と、各発泡コア２ａ，２ｂの互いに傾斜して対向する傾斜部に沿って延びるスプライス部９とを有する。このようなアレスタ５は、前記面板４ａ，４ｂと同様な繊維強化複合材料から成る（たとえば、特許文献１参照）。 In the foam core sandwich panel 1, the foam cores 2a and 2b are provided with arresters 5 between the face plates 4a and 4b in order to prevent the face plates 4a and 4b and the foam cores 2a and 2b from being peeled off. The arrester 5 includes a bent portion 7 that covers the tip portions 3a and 3b of the foamed cores 2a and 2b processed into acute angles, a face plate portion 8 that extends from the bent portion 7 along the face plates 4a and 4b, and each foamed portion. The core 2a, 2b has a splice portion 9 that extends along inclined portions that are inclined to face each other. Such an arrester 5 is made of a fiber-reinforced composite material similar to the face plates 4a and 4b (see, for example, Patent Document 1).
前述の従来技術では、各面板４ａ，４ｂ間にわたって設けられるアレスタ５は、各発泡コア２ａ，２ｂの先端部を覆う折曲げ部７の両側に面板部８とスプライス部９とが連なって形成され、このようなアレスタ５を形成するために、各発泡コア２ａ，２ｂに、前記折曲げ部７、面板部８およびスプライス部９に対応する位置にわたって、繊維強化複合材料の前駆体である未硬化のプリプレグを手作業で慎重に折曲げて積層しなければならず、製造時の作業性が悪いという問題がある。また、鋭角に加工した各発泡コア２ａ，２ｂの先端部３ａ，３ｂは、加工時に損傷しやすいため、加工に手間を要し、生産性が悪いという問題がある。 In the above-described prior art, the arrester 5 provided between the face plates 4a and 4b is formed by connecting the face plate portion 8 and the splice portion 9 on both sides of the bent portion 7 covering the distal end portions of the foam cores 2a and 2b. In order to form such an arrester 5, uncured fiber reinforced composite material precursors are formed on the respective foam cores 2a and 2b over positions corresponding to the bent portion 7, the face plate portion 8 and the splice portion 9. The prepreg must be carefully folded by hand and laminated, which has a problem of poor workability during production. Moreover, since the tip portions 3a and 3b of the foamed cores 2a and 2b processed at an acute angle are easily damaged during processing, there is a problem that processing is troublesome and productivity is poor.
本発明の目的は、発泡コアの先端部を損傷することなく、発泡コアにプリプレグを容易に積層することができ、生産性を向上することができるサンドイッチパネルの剥離進展防止構造を提供することである。 An object of the present invention is to provide a sandwich panel peeling prevention structure that can easily laminate a prepreg on a foam core without damaging the tip of the foam core and can improve productivity. is there.
本発明は、発泡合成樹脂から成る複数の発泡コアの厚み方向両側の各表面に、繊維強化複合材料から成る面板が積層された状態で一体的に形成されるサンドイッチパネルにおいて、
前記発泡コアは、各発泡コアの接合部にその厚み方向一方側の表面から前記厚み方向他方側の表面に向かって傾斜する傾斜部を有し、この傾斜部と面板とが鋭角で交差する先端部に、前記発泡コアよりも剛性の高い材料から成るアレスタが形成されることを特徴とするサンドイッチパネルの剥離進展防止構造である。
The present invention is a sandwich panel integrally formed with a face plate made of a fiber-reinforced composite material laminated on each surface on both sides in the thickness direction of a plurality of foamed cores made of a foamed synthetic resin.
The foam core has an inclined portion that is inclined from the surface on one side in the thickness direction toward the surface on the other side in the thickness direction at a joint portion of each foam core, and the tip at which the inclined portion and the face plate intersect at an acute angle in part, a release extension preventing structure of the sandwich panel, wherein a arresters made of material having higher rigidity than the foam core is formed.
本発明に従えば、発泡合成樹脂から成る複数の発泡コアの厚み方向両側の各表面に、繊維強化複合材料から成る面板が積層される。前記発泡コアは、各発泡コアの接合部にその厚み方向一方側の表面から前記厚み方向他方側の表面に向かって傾斜する傾斜部を有する。前記発泡コアの傾斜部と面板とが鋭角で交差する先端部は、前記発泡コアよりも剛性の高い材料から成るアレスタが形成される。 According to the present invention, face plates made of a fiber-reinforced composite material are laminated on each surface on both sides in the thickness direction of a plurality of foamed cores made of foamed synthetic resin. The foam core has an inclined portion that is inclined from the surface on one side in the thickness direction toward the surface on the other side in the thickness direction at a joint portion of each foam core . An arrester made of a material having rigidity higher than that of the foam core is formed at a tip portion where the inclined portion of the foam core and the face plate intersect at an acute angle.
このように発泡コアの先端部を、この発泡コアよりも剛性に高い材料によって代替させるので、面板と発泡コアとの間の剥離の進展を防止することができる。このようなサンドイッチパネルの発泡コアには、鋭角の先端部を形成する必要がなく、前述のように発泡コアよりも剛性の高い材料によって先端部にアレスタが形成されるので、加工時における先端部が容易に損傷することを防止することができる。また、前記従来技術のように、発泡合成樹脂から成る発泡コアの先端部に、繊維強化複合材料の前駆体であるプリプレグを手作業で慎重に折曲げて積層する必要がないので、製造時の手間を削減することができ、生産性を向上することができる。 Thus, since the tip part of the foam core is replaced with a material having rigidity higher than that of the foam core, it is possible to prevent the progress of peeling between the face plate and the foam core. The foam core of such a sandwich panel does not need to have an acute tip, and as described above, an arrester is formed at the tip by a material having higher rigidity than the foam core, so that the tip at the time of processing Can be prevented from being easily damaged. Further, unlike the prior art, it is not necessary to manually fold and laminate the prepreg, which is a precursor of the fiber reinforced composite material, at the tip of the foam core made of the foam synthetic resin. Time and effort can be reduced, and productivity can be improved.
また本発明は、前記発泡コアは、その厚み方向一方側の表面から前記厚み方向他方側の表面に向かって傾斜する第１傾斜部と、第１傾斜部に対向して平行に延びる第２傾斜部とを有し、第１傾斜部と第２傾斜部とは、繊維強化複合材料から成るスプライス部を介して一体的に形成されることを特徴とする。 According to the present invention, the foam core has a first inclined portion inclined from the surface on one side in the thickness direction toward the surface on the other side in the thickness direction, and a second inclination extending in parallel to face the first inclined portion. The first inclined portion and the second inclined portion are integrally formed through a splice portion made of a fiber reinforced composite material.
本発明に従えば、前記発泡コアは、第１傾斜部と第２傾斜部とを有し、第１傾斜部と第２傾斜部とは、繊維強化複合材料から成るスプライス部を介して一体的に形成されるので、製造時に手間を要することなく、生産性を向上して、面板と発泡コアとの間の剥離の進展を、より一層確実に防止することができる。 According to the present invention, the foam core has a first inclined portion and a second inclined portion, and the first inclined portion and the second inclined portion are integrated via a splice portion made of a fiber-reinforced composite material. Therefore, the productivity can be improved and the progress of peeling between the face plate and the foamed core can be more reliably prevented without requiring labor at the time of manufacture.
さらに本発明は、前記アレスタは、前記繊維強化複合材料から成ることを特徴とする。
本発明に従えば、前記アレスタが前記繊維強化複合材料から成るので、アレスタと面板とを共通な繊維強化複合材料によって形成することができ、これによって面板とアレスタとを材質的に一様な構造とし、荷重を広範囲に分散して発生させることができ、局所的に高い応力が発生することを防止し、より一層確実に剥離の進展を抑制することができる。
Furthermore, the present invention is characterized in that the arrester is made of the fiber-reinforced composite material.
According to the present invention, since the arrester is made of the fiber reinforced composite material, the arrester and the face plate can be formed of a common fiber reinforced composite material, whereby the face plate and the arrester have a uniform material structure. Thus, the load can be distributed over a wide range, the high stress can be prevented from being generated locally, and the progress of peeling can be more reliably suppressed.
本発明によれば、発泡コアの先端部にアレスタを発泡コアよりも剛性の高い材料によって形成するので、加工時における先端部の損傷を防止し、先端部の繊維強化複合材料の前駆体であるプリプレグの積層作業を容易化し、生産性を向上して、確実に剥離の進展を抑制することができる。 According to the present invention, since the arrester is formed of a material having rigidity higher than that of the foam core at the tip portion of the foam core, the tip portion is prevented from being damaged during processing, and is a precursor of the fiber reinforced composite material at the tip portion. The prepreg lamination work can be facilitated, the productivity can be improved, and the progress of peeling can be reliably suppressed.
また本発明によれば、発泡コアが第１傾斜部と第２傾斜部とがスプライス部を介して一体的に形成されるので、面板と発泡コアとのに間の剥離の進展をより一層確実に防止することができる。 Further, according to the present invention, since the first inclined portion and the second inclined portion are integrally formed through the splice portion, the progress of peeling between the face plate and the foam core is further ensured. Can be prevented.
さらに本発明によれば、アレスタが繊維強化複合材料から成るので、アレスタと面板とを共通な繊維強化複合材料によって形成することができ、これによってアレスタと面板とを一体化し、荷重をアレスタと面板とに分散して応力を軽減し、より一層確実に剥離の進展を防止することができる。 Further, according to the present invention, since the arrester is made of a fiber reinforced composite material, the arrester and the face plate can be formed of a common fiber reinforced composite material, thereby integrating the arrester and the face plate, and applying the load to the arrester and the face plate. It is possible to reduce the stress by dispersing them and prevent the progress of peeling more reliably.
図１は本発明の実施の一形態の剥離進展防止構造が適用されたサンドイッチパネル２０の一部の断面図であり、図２は一方の発泡コア２１の先端部２３付近の拡大断面図である。航空機の機体などの構造用材料として好適に用いられるサンドイッチパネル２０は、面方向（図１の左右方向）に隣接し、発泡合成樹脂から成る複数（本実施の形態では２）の発泡コア２１，２２と、各発泡コア２１，２２の厚み方向（図１の上下方向）Ｙ両側の各表面２５，２６上に積層されて一体的に設けられる面板２７，２８とを有する。 FIG. 1 is a cross-sectional view of a part of a sandwich panel 20 to which a peeling progress preventing structure according to an embodiment of the present invention is applied, and FIG. 2 is an enlarged cross-sectional view of the vicinity of a tip 23 of one foam core 21. . A sandwich panel 20 that is preferably used as a structural material for an aircraft body or the like is adjacent to the surface direction (left-right direction in FIG. 1), and includes a plurality (2 in the present embodiment) of foam cores 21 made of foamed synthetic resin. 22 and face plates 27 and 28 which are laminated and integrally provided on the respective surfaces 25 and 26 on both sides of the foam cores 21 and 22 in the thickness direction (vertical direction in FIG. 1) Y.
各発泡コア２１，２２は、厚み方向Ｙ一方側の表面２５から厚み方向他方側の表面２６に向かって傾斜する第１傾斜部２９と、第１傾斜部２９に対向して平行に延びる第２傾斜部３０とを有し、第１傾斜部２９と第２傾斜部３０とはスプライス部３１を介して一体的に形成される。 Each of the foam cores 21 and 22 has a first inclined portion 29 inclined from the surface 25 on one side in the thickness direction Y toward the surface 26 on the other side in the thickness direction, and a second extending in parallel to face the first inclined portion 29. The first inclined portion 29 and the second inclined portion 30 are integrally formed via a splice portion 31.
前記発泡コア２１，２２は、発泡合成樹脂材料から成る。この発泡合成樹脂材料としては、たとえぼポリエーテルイミド（ＰＥＩ）、ポリメタクリルイミド（ＰＭＩ）またはポリビニルクロライド（ＰＶＣ）が好適に用いられる。このような発泡合成樹脂は、独立気泡であってもよく、連続気泡であってもよい。 The foam cores 21 and 22 are made of a foam synthetic resin material. As this foamed synthetic resin material, polyetherimide (PEI), polymethacrylimide (PMI) or polyvinyl chloride (PVC) is preferably used. Such foamed synthetic resin may be closed cells or open cells.
各面板２７，２８は、繊維強化複合材料から成る。この繊維強化複合材料は、強化繊維から成る基材に、マトリクス樹脂を含浸させたいわゆるシート状のプリプレグとして商業的に入手可能な材料を積層して加熱し、硬化させたものである。強化繊維は、たとえば炭素繊維またはガラス繊維が用いられ、２次元または３次元の織物あるいは編物によって実現される。また前記マトリクス樹脂は、たとえばエポキシ樹脂を用いることができ、このエポキシ樹脂を含浸させた未硬化の状態、すなわち前述のプリプレグを発泡コア２１，２２の各表面２５，２６上に積層し、加熱硬化させることによってサンドイッチパネル２０が形成される。 Each face plate 27, 28 is made of a fiber reinforced composite material. This fiber-reinforced composite material is obtained by laminating a material commercially available as a so-called sheet-like prepreg impregnated with a matrix resin on a base material composed of reinforcing fibers, and heating and curing the material. For example, carbon fiber or glass fiber is used as the reinforcing fiber, and the reinforcing fiber is realized by a two-dimensional or three-dimensional fabric or knitted fabric. For example, an epoxy resin can be used as the matrix resin, and an uncured state impregnated with the epoxy resin, that is, the above-described prepreg is laminated on the surfaces 25 and 26 of the foamed cores 21 and 22 and heat-cured. As a result, the sandwich panel 20 is formed.
各発泡コア２１，２２の各先端部２３，２４には、発泡コア２１，２２よりも剛性の高い材料から成るアレスタ３２，３３が形成される。このようなアレスタ３２，３３は、各発泡コア２１，２２の先端部２３，２４を面方向に予め定める幅Ｗだけ切落し、フィラー材を充填し、硬化させることによって形成される。 Arrestors 32 and 33 made of a material having higher rigidity than the foam cores 21 and 22 are formed at the respective tip portions 23 and 24 of the respective foam cores 21 and 22. Such arresters 32 and 33 are formed by cutting off the front end portions 23 and 24 of the respective foam cores 21 and 22 by a predetermined width W in the surface direction, filling with a filler material, and curing.
このようなアレスタ３２，３３を形成することによって、各発泡コア２１，２２の各先端部２３，２４の鋭角部に前述したプリプレグを巻付ける際に、先端部２３，２４が損傷してしまうという不具合を回避することができ、しかも従来技術のようにプリプレグを手作業に慎重に折曲げて積層する必要がないので、製造時の手間が少なくてすみ、生産性を向上することができる。 By forming such arresters 32 and 33, the tip portions 23 and 24 are damaged when the prepreg is wound around the acute angle portions of the tip portions 23 and 24 of the foam cores 21 and 22, respectively. Problems can be avoided, and it is not necessary to carefully fold and stack the prepregs manually as in the prior art, so that less labor is required during production and productivity can be improved.
このようなアレスタ３２，３３を形成するフィラー材としては、前述の面板２７，２８と同種材料、すなわち繊維強化複合材料から成り、前記スプライス部３１もまた同種材料から成る。面板スプライスは織物材であり、フィラーは一方向材でともにＣＦＲＰ材である。また、材料はＣＦＲＰ材に限らず、エポキシ樹脂（レジン材）でも、適用可能である。 The filler material for forming the arresters 32 and 33 is made of the same material as the face plates 27 and 28, that is, a fiber reinforced composite material, and the splice portion 31 is also made of the same material. The face plate splice is a woven material, and the fillers are unidirectional materials and both are CFRP materials. Further, the material is not limited to the CFRP material, and an epoxy resin (resin material) can also be applied.
このようなアレスタ３２，３３は各発泡コア２１，２２の接合部に設けられ、本実施の形態では格子状に設けられる。各発泡コア２１，２２が平板状の場合、アレスタ３２，３３は直線状に延び、また各発泡コア２１，２２が曲面状に湾曲して形成される場合には、その曲面に沿って直線状に延びる。 Such arresters 32 and 33 are provided at the joints of the respective foam cores 21 and 22, and are provided in a lattice shape in the present embodiment. When the foam cores 21 and 22 are flat, the arresters 32 and 33 extend in a straight line, and when the foam cores 21 and 22 are curved to form a straight line along the curved surface. Extend to.
このようにアレスタ３２，３３を各面板２７，２８の素材である繊維強化複合材料と同種材料を用いることによって、各面板２７，２８とスプライス部３１と各アレスタ３２，３３とを材質的に一様な構造として、荷重が作用したときに、その荷重を広範囲に分散し、局所的に高い応力が発生することを防止し、剥離の進展を抑制することができる。 Thus, by using the same type of material as the fiber reinforced composite material that is the material of the face plates 27 and 28 for the arresters 32 and 33, the face plates 27 and 28, the splice portion 31, and the arresters 32 and 33 are made of one material. With such a structure, when a load is applied, the load can be dispersed over a wide range, high local stress can be prevented from being generated, and the progress of peeling can be suppressed.
図３はアレスタ３２の剥離進展防止効果を確認するための解析モデル３５を示す図であり、図４は解析モデル３５へのモードＩ負荷形態を示す図であり、図５は解析モード３５へのモードＩＩ負荷形態を示す図である。本件発明者は、アレスタ３２による剥離進展防止効果を確認するために、サンドイッチパネル２０を模擬する解析モデル３５を図３に示すように想定し、有限要素法（ＦＥＭ）解析によってアレスタ３２による剥離進展防止効果を評価した。なお、解析モデル３５において、サンドイッチパネル２０と対応する部分には同一の参照符を付す。 FIG. 3 is a diagram showing an analysis model 35 for confirming the effect of preventing the peeling progress of the arrester 32, FIG. 4 is a diagram showing a mode I load form on the analysis model 35, and FIG. It is a figure which shows a mode II load form. The present inventor assumes an analysis model 35 simulating the sandwich panel 20 as shown in FIG. 3 in order to confirm the effect of preventing the peeling progress by the arrester 32, and the peeling progress by the arrester 32 by a finite element method (FEM) analysis. The prevention effect was evaluated. In the analysis model 35, the same reference numerals are assigned to portions corresponding to the sandwich panel 20.
解析モデル３５では、発泡コア２１，２２の厚み方向Ｙ両側に面板２７，２８が積層され、各面板２７，２８は樹脂層３６を介して各発泡コア２１，２２の各表面２５，２６に接着され、各発泡コア２１，２２の各先端部２３，２４にはアレスタ３２，３３が設けられる。各アレスタ３２，３３の断面形状は直角三角形であり、最も長い一辺がスプライス部３１に臨み、次に長い一辺が面板２７，２８に臨み、最も短かい一辺が発泡コア２１，２２に臨むように設けられる。 In the analysis model 35, face plates 27 and 28 are laminated on both sides in the thickness direction Y of the foam cores 21 and 22, and the face plates 27 and 28 are bonded to the surfaces 25 and 26 of the foam cores 21 and 22 through the resin layer 36. Arrestors 32 and 33 are provided at the tip portions 23 and 24 of the foam cores 21 and 22, respectively. The cross-sectional shape of each arrester 32, 33 is a right triangle, so that the longest side faces the splice part 31, the next long side faces the face plates 27, 28, and the shortest side faces the foam cores 21, 22. Provided.
またこの解析モデル３５では、樹脂層３６は各アレスタ３２，３３と各面板２７，２８の間に介在されていない。各面板２７，２８は、発泡コア２１，２２寄りの厚み方向内方に配置される第１層と、その外側の第２層とから成る。第１層は、各表面２５，２６に平行な図３の左右方向である面方向Ｘに対して成す角度が０度および９０度の繊維から成る２次元織物を基材とし、第２層は、前記面方向Ｘに対して成す角度が±４５度の繊維から成る２次元織物を基材とする。 In the analysis model 35, the resin layer 36 is not interposed between the arresters 32 and 33 and the face plates 27 and 28. Each of the face plates 27 and 28 includes a first layer disposed inward in the thickness direction near the foam cores 21 and 22 and a second layer outside the first layer. The first layer is based on a two-dimensional fabric made of fibers having angles of 0 degrees and 90 degrees with respect to the plane direction X which is the left-right direction in FIG. 3 parallel to the surfaces 25 and 26, and the second layer is The base material is a two-dimensional fabric made of fibers having an angle of ± 45 degrees with respect to the surface direction X.
この解析モデル３５におけるサンドイッチパネル２０の前記面方向Ｘに沿う全長Ｌ０が３００ｍｍであり、前記面方向Ｘ一端部の端面から距離Ｌ１の位置に、アレスタ３２が設けられる。このような解析モデル３５によって表わされるサンドイッチパネル２０の前記面方向Ｘ一端部の端面から面方向Ｘ他端部の端面に向けて他方の発泡コア２２と面板２７との間、さらに詳しくは他方の発泡コア２２と一方の面板２７を接着する樹脂層３６との間に剥離長さａの剥離３７が生じているものと仮定する。 The total length L0 along the surface direction X of the sandwich panel 20 in the analysis model 35 is 300 mm, and the arrester 32 is provided at a position of a distance L1 from the end surface of one end portion of the surface direction X. Between the other foam core 22 and the face plate 27 from the end surface of the one end portion in the surface direction X of the sandwich panel 20 represented by the analysis model 35 to the end surface of the other end portion in the surface direction X, more specifically, the other side. It is assumed that a peeling 37 having a peeling length a occurs between the foam core 22 and the resin layer 36 to which the one face plate 27 is bonded.
このような解析モデル３５を用いて、図４に示すモードＩ負荷形態および図５に示すモードＩＩ負荷形態で剥離の進展について評価した。モードＩ負荷形態では、面方向Ｘ一端部の端面と他方の面板２８の発泡コア２２と反対側の表面とが交差する角部の位置Ｐｓ１を、面方向Ｘおよび厚み方向の変位を阻止するように支持した状態で、面方向Ｘ一端部の端面と一方の面板２７の発泡コア２２に関して反対側の表面２５とが交差する角部の位置Ｐｆ１に、他方の面板２８から一方の面板２７に向かう厚み方向の剥離力Ｆ１を与える負荷形態である。 Using such an analysis model 35, the progress of delamination was evaluated in the mode I load mode shown in FIG. 4 and the mode II load mode shown in FIG. In the mode I load configuration, the position Ps1 at the corner where the end surface of one end portion of the surface direction X intersects the surface opposite to the foam core 22 of the other face plate 28 is prevented from being displaced in the surface direction X and the thickness direction. In the state where it is supported, the other face plate 28 is directed to one face plate 27 at a corner position Pf1 where the end face of one end portion in the plane direction X and the opposite surface 25 of the foam core 22 of one face plate 27 intersect. It is a load form which gives the peeling force F1 in the thickness direction.
すなわち、サンドイッチパネル２０の面方向Ｘ一端部を下方から前記面方向Ｘに移動自在に支持して、第１可動支点４１と、サンドイッチパネル２０の面方向Ｘ一端部の下端を面方向Ｘ一方側から厚み方向Ｙに移動自在に支持する第２可動支点４２と、サンドイッチパネル２０の面方向Ｘ一端部を上端で前記面方向Ｘ一方側から厚み方向に移動自在に支持する第３可動支点４３を設け、面方向Ｘ一端部の上面に剥離力Ｆ１を作用させた状態を、モードＩ負荷形態とする。ここで、剥離力Ｆ１は１００Ｎである。 That is, one end of the surface direction X of the sandwich panel 20 is supported movably in the surface direction X from below, and the lower end of the first movable fulcrum 41 and the one end of the surface direction X of the sandwich panel 20 is one side in the surface direction X. And a third movable fulcrum 43 that supports one end of the surface direction X of the sandwich panel 20 movably in the thickness direction from one side of the surface direction X at the upper end. A state in which the peeling force F1 is applied to the upper surface of one end portion in the surface direction X is referred to as a mode I load mode. Here, the peeling force F1 is 100N.
前記モードＩＩ負荷形態は、各サンドイッチパネル２０の面板２８上で、面方向Ｘ両端部の各端面から面方向Ｘ内方へそれぞれ距離Ｌ２，Ｌ３だけ近付いた位置Ｐｓ２１，Ｐｓ２２を、面方向Ｘおよび厚み方向の変位を阻止するように支持した状態で、一方の面板２７の発泡コア２１，２２とは反対側の表面における面方向Ｘ中央位置Ｐｆ２に、一方の面板２７から他方の面板２８に向かって、せん断力Ｆ２を与える負荷形態である。 In the mode II load form, positions Ps21 and Ps22 that are close to each other by distances L2 and L3 from the respective end surfaces of both ends of the surface direction X toward the inside of the surface direction X on the face plate 28 of each sandwich panel 20 are expressed in terms of the surface direction X and In a state where it is supported to prevent displacement in the thickness direction, one face plate 27 is directed from the one face plate 27 to the other face plate 28 in the face direction X center position Pf2 on the surface of the face plate 27 opposite to the foam cores 21 and 22. Thus, it is a load form that gives the shearing force F2.
すなわち、サンドイッチパネル２０の面方向Ｘ両端部の端面から内方に距離Ｌ２，Ｌ３の位置Ｐｓ２１，Ｐｓ２２を下方から面方向Ｘに沿って移動自在な第４可動支点４４によって支持し、サンドイッチパネル２０の下面を面方向Ｘ一端部の端面から内方に距離Ｌ２の位置で前記面方向Ｘ一方側から厚み方向に移動自在に第５可動支点４５によって支持する。サンドイッチパネル２０の面方向Ｘ他端部の端面から内方に距離Ｌ３の位置を前記面方向Ｘに移動自在に第６可動支点４６によって支持し、さらにサンドイッチパネル２０の面方向Ｘ一端部の端面から内方に距離Ｌ３の位置を下面で前記面方向Ｘ一方側から厚み方向に移動自在に第７可動支点４７によって支持し、サンドイッチパネル２０を全長Ｌ０の中央（Ｌ０／２）の上面の位置Ｐｆ２を厚み方向に移動自在に第８可動支点４８によって面方向Ｘ一方側から支持し、この中央の位置Ｐｆ２に上方から、せん断力Ｆ２を作用させた負荷形態である。前記距離Ｌ２，Ｌ３は、５０ｍｍであり、せん断力Ｆ２は１０００Ｎである。 That is, the positions Ps21 and Ps22 at distances L2 and L3 are supported by the fourth movable fulcrum 44 that can move along the surface direction X from below from the end surfaces of both ends in the surface direction X of the sandwich panel 20. Is supported by a fifth movable fulcrum 45 movably in the thickness direction from one side of the surface direction X at a distance L2 inward from the end surface of one end portion of the surface direction X. A position at a distance L3 is supported by the sixth movable fulcrum 46 so as to be movable inward in the surface direction X from the end surface of the other end portion in the surface direction X of the sandwich panel 20, and the end surface of one end portion in the surface direction X of the sandwich panel 20 The position of the distance L3 inward from the surface is supported by the seventh movable fulcrum 47 so as to be movable in the thickness direction from one side of the surface direction X on the lower surface, and the sandwich panel 20 is positioned on the upper surface at the center (L0 / 2) of the total length L0. This is a load configuration in which Pf2 is supported from one side in the plane direction X by the eighth movable fulcrum 48 so as to be movable in the thickness direction, and a shear force F2 is applied to the center position Pf2 from above. The distances L2 and L3 are 50 mm, and the shearing force F2 is 1000N.
図６は、モードＩ負荷形態での負荷に対する剥離長さａとエネルギ解放率Ｇとの関係を示すグラフである。同図には、炭素繊維を強化繊維とする一方向（紙面に垂直方向、ＵＤ９０度）の材料を基材とする繊維強化複合材料（ＣＦＲＰ）から成るアレスタ３２，３３が設けられるサンドイッチパネル２０のＧ値を示し、横軸は剥離長さａであり、縦軸はＧ値である。 FIG. 6 is a graph showing the relationship between the peel length a and the energy release rate G with respect to the load in the mode I load configuration. The figure shows a sandwich panel 20 provided with arresters 32 and 33 made of a fiber reinforced composite material (CFRP) based on a material in one direction (perpendicular to the paper surface, UD 90 degrees) using carbon fibers as reinforcing fibers. The G value is shown, the horizontal axis is the peel length a, and the vertical axis is the G value.
同図において、符号「□」を結ぶライン５１は、アレスタが設けられない場合のＧ値を示し、符号「◇」を結ぶライン５２は、一方向（ＵＤ９０度）の強化繊維を基材として用いた繊維強化複合材料から成るアレスタ３２，３３を設けた場合のＧ値を示し、符号「△」を結ぶライン５３は、発泡コア２１，２２と同様な発泡合成樹脂から成るアレスタ３２，３３を設けた場合のＧ値を示し、符号「〇」を結ぶライン５４は一方向（ＵＤ９０度）の強化繊維を基材とする繊維強化合成樹脂から成るアレスタ３２，３３を設け、かつ３プライ（ＰＬＹ）のスプライス部３１を設けた場合のＧ値を示す。 In the figure, a line 51 connecting the reference symbol “□” indicates a G value when no arrester is provided, and a line 52 connecting the reference symbol “◇” is used as a reinforced fiber in one direction (UD 90 degrees). The G value in the case where the arresters 32 and 33 made of fiber reinforced composite material are provided, and the line 53 connecting the symbols “Δ” is provided with the arresters 32 and 33 made of foamed synthetic resin similar to the foam cores 21 and 22. The line 54 connecting the symbols “◯” is provided with arresters 32 and 33 made of fiber reinforced synthetic resin based on reinforced fibers in one direction (UD 90 degrees) and 3 plies (PLY) The G value when the splice part 31 is provided is shown.
図７は、モードＩＩ負荷形態での負荷に対する剥離長さａとＧ値との関係を示すグラフである。同図には、炭素繊維を強化繊維とする一方向（紙面に垂直方向、ＵＤ９０度）の材料を基材とした繊維強化複合材料から成るアレスタ３２，３３が設けられた場合のＧ値を示し、横軸は剥離長さａを示し、縦軸はＧ値を示す。 FIG. 7 is a graph showing the relationship between the peel length a and the G value with respect to the load in the mode II load configuration. This figure shows the G value when arresters 32 and 33 made of a fiber reinforced composite material based on a material in one direction (perpendicular to the paper surface, UD 90 degrees) using carbon fiber as the reinforcing fiber are provided. The horizontal axis represents the peel length a, and the vertical axis represents the G value.
同図において、符号「□」を結ぶライン６１は、アレスタが設けられない場合のＧ値を示し、符号「◇」を結ぶライン６２は、一方向（ＵＤ９０度）の強化繊維を基材として用いた繊維強化複合材料から成るアレスタ３２，３３を設けた場合のＧ値を示し、符号「△」を結ぶライン６３は、発泡コア２１，２２と同様な発泡合成樹脂から成るアレスタ３２，３３を設けた場合のＧ値を示し、符号「〇」を結ぶライン６４は一方向（ＵＤ９０度）の強化繊維を基材とする繊維強化合成樹脂から成るアレスタ３２，３３を設け、かつ３プライ（ＰＬＹ）のスプライス部３１を設けた場合のＧ値を示す。 In the figure, a line 61 connecting the reference sign “□” indicates a G value when no arrester is provided, and a line 62 connecting the reference sign “◇” is used as a reinforced fiber in one direction (UD 90 degrees). The G value when the arresters 32 and 33 made of fiber reinforced composite material are provided, and the line 63 connecting the symbols “Δ” is provided with the arresters 32 and 33 made of foamed synthetic resin similar to the foam cores 21 and 22. The line 64 connecting the symbol “◯” is provided with arresters 32 and 33 made of fiber reinforced synthetic resin based on reinforced fibers in one direction (UD 90 degrees) and 3 plies (PLY) The G value when the splice part 31 is provided is shown.
前記剥離長さａは、面方向Ｘ一端部の端面寄りの支持位置Ｐｓ２１から剥離３７の先端３７ａまでの距離ｂに、軸線方向一端部の端面から前記支持位置Ｐｓ２１までの距離Ｌ２を加えた値（ａ＝ｂ＋Ｌ２）である。 The peeling length a is a value obtained by adding a distance L2 from the end face of one end in the axial direction to the support position Ps21 to the distance b from the support position Ps21 near the end face of the one end in the plane direction X to the tip 37a of the peel 37. (A = b + L2).
これらの図６および図７に示すように、剥離長さａを変化させて剥離３７の先端３７ａがアレスタ３２，３３から離れた位置に存在する場合と、近い位置に存在する場合とにおいて、Ｇ値をそれぞれ求めた結果、各負荷形態Ｉ，ＩＩともに、剥離３７の先端３７ａがアレスタ３２，３３に近付くにつれて、エネルギ解放率Ｇが急激に低減することを確認した。 As shown in FIG. 6 and FIG. 7, when the peeling length a is changed and the tip 37a of the peeling 37 is located at a position away from the arresters 32 and 33, and when the tip 37a is located at a close position, G As a result of obtaining the values, it was confirmed that the energy release rate G rapidly decreased as the tip 37a of the separation 37 approached the arresters 32 and 33 in each of the load forms I and II.
このようにアレスタ３２，３３を設けることによって、剥離３７の先端３７ａがアレスタ３２，３３に近付くと、エネルギ解放率Ｇが低下し、剥離３７の進展を防止または抑制することが確認された。このようにフィラー材を充填することによって、アレスタ３２，３３を前記従来の技術のように加工に手間を要することなく、実現することができ、高い剥離防止機能を有するサンドイッチパネルを容易に製造することが可能となり、生産性を向上することができる。 By providing the arresters 32 and 33 in this way, it was confirmed that when the tip 37a of the peeling 37 approaches the arresters 32 and 33, the energy release rate G is reduced and the progress of the peeling 37 is prevented or suppressed. By filling the filler material in this way, the arresters 32 and 33 can be realized without requiring labor for processing as in the prior art, and a sandwich panel having a high peeling prevention function is easily manufactured. And productivity can be improved.
本発明の実施の他の形態では、前記アレスタ３２，３３をフィラー材を充填するのではなく、別途に半硬化状態のブロックを形成して、サンドイッチパネルの成形時に各発泡コア２１，２２の先端部２３，２４に装着し、同時に硬化させてサンドイッチパネル２０を製造するようにしてもよい。 In another embodiment of the present invention, the arresters 32 and 33 are not filled with a filler material, but a semi-cured block is separately formed, and the tips of the foam cores 21 and 22 are formed at the time of forming the sandwich panel. The sandwich panel 20 may be manufactured by being attached to the parts 23 and 24 and cured at the same time.
２０ サンドイッチパネル
２１，２２ 発泡コア
２３，２４ 先端部
２５，２６ 表面
２７，２８ 面板
２９，３０ 傾斜部
３１ スプライス部
３２，３３ アレスタ
20 Sandwich panel 21, 22 Foam core 23, 24 Tip part 25, 26 Surface 27, 28 Face plate 29, 30 Inclined part 31 Splice part 32, 33 Arrester
Claims (3)
前記発泡コアは、各発泡コアの接合部にその厚み方向一方側の表面から前記厚み方向他方側の表面に向かって傾斜する傾斜部を有し、この傾斜部と面板とが鋭角で交差する先端部に、前記発泡コアよりも剛性の高い材料から成るアレスタが形成されることを特徴とするサンドイッチパネルの剥離進展防止構造。 In a sandwich panel integrally formed with a face plate made of a fiber-reinforced composite material laminated on each surface on both sides in the thickness direction of a plurality of foam cores made of a foamed synthetic resin,
The foam core has an inclined portion that is inclined from the surface on one side in the thickness direction toward the surface on the other side in the thickness direction at a joint portion of each foam core, and the tip at which the inclined portion and the face plate intersect at an acute angle A sandwich panel peeling progress preventing structure characterized in that an arrester made of a material having higher rigidity than the foam core is formed in the part.
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| JP2007252611A JP4928403B2 (en) | 2007-09-27 | 2007-09-27 | Structure for preventing delamination of sandwich panels |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016129570A1 (en) * | 2015-02-13 | 2016-08-18 | 国立大学法人東京大学 | Bonded structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5294325B2 (en) * | 2009-09-08 | 2013-09-18 | 川崎重工業株式会社 | Laminated structure, crack detection method thereof, and crack detection structure |
| US8992709B2 (en) * | 2009-12-04 | 2015-03-31 | The Boeing Company | Sandwich structure having arrestment feature and method of making the same |
| FR3036373B1 (en) * | 2015-05-21 | 2019-01-25 | Arianegroup Sas | EXTENDED SANDWICH STRUCTURE FORMING AN ADDITIONAL STRUCTURE |
| JP7187378B2 (en) * | 2019-04-23 | 2022-12-12 | 三菱重工業株式会社 | Adhesive member, method for forming adhesive member, and method for forming adhesive layer |
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| JP4746340B2 (en) * | 2005-04-01 | 2011-08-10 | 川崎重工業株式会社 | Structure for preventing delamination of sandwich panels |
| JP4537247B2 (en) * | 2005-04-01 | 2010-09-01 | 川崎重工業株式会社 | Method for suppressing cracking in composite sandwich panel joints |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016129570A1 (en) * | 2015-02-13 | 2016-08-18 | 国立大学法人東京大学 | Bonded structure |
| JPWO2016129570A1 (en) * | 2015-02-13 | 2017-11-24 | 国立大学法人 東京大学 | Adhesive structure |
| US10518484B2 (en) | 2015-02-13 | 2019-12-31 | The University Of Tokyo | Bonded structure |
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| JP2009083551A (en) | 2009-04-23 |
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