JP4870056B2 - Structure for preventing delamination of sandwich panels - Google Patents
Structure for preventing delamination of sandwich panels Download PDFInfo
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- JP4870056B2 JP4870056B2 JP2007252625A JP2007252625A JP4870056B2 JP 4870056 B2 JP4870056 B2 JP 4870056B2 JP 2007252625 A JP2007252625 A JP 2007252625A JP 2007252625 A JP2007252625 A JP 2007252625A JP 4870056 B2 JP4870056 B2 JP 4870056B2
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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発生およびその進展を防止して、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 prevents the face plate from peeling from the foam core by preventing the occurrence and development of the peel between the foam core made of the foamed synthetic resin and the face plate laminated and integrally formed on the surface. The present invention relates to a structure for preventing peeling progress of sandwich panels.
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のアレスタ５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、発泡コア２の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２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 arrester 5 of the foam core sandwich panel 1 shown in FIG. The foam core sandwich panel 1 is integrally formed by laminating face plates 4 a and 4 b on the surface on one side in the thickness direction perpendicular to the surface direction of the foam core 2 and the surface on the other side in the thickness direction. The foam core 2 is also called a foam core and is made of a 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、各面板４ａ，４ｂと発泡コア２との剥離を防止するため、面板４から発泡コア２内へ突出するアレスタ５が設けられる。このアレスタ５は、発泡コアサンドイッチパネル１の面方向Ｘ一端面から面方向Ｘ他端部に向かう剥離６の進展を阻止し、発泡コア２から面板４ａが剥離することを防止することができる。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 described above, an arrester 5 that protrudes from the face plate 4 into the foam core 2 is provided in order to prevent the face plates 4a and 4b and the foam core 2 from being peeled off. This arrester 5 can prevent the progress of the peeling 6 from the one end surface in the plane direction X to the other end portion in the plane direction X of the foam core sandwich panel 1, and can prevent the face plate 4 a from peeling from the foam core 2. 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、面板４ａから発泡コア２内に埋没するように設けられるアレスタ５は、剥離６の進展を抑制することはできるが、パネルと一体成形するため、パネル成形後には追加できないという問題がある。 In the above-described prior art, the arrester 5 provided so as to be buried in the foam core 2 from the face plate 4a can suppress the progress of the peeling 6. However, since it is integrally molded with the panel, it cannot be added after the panel molding. There's a problem.
本発明の目的は、加工後でもアレスタを容易に設けることができ、適用範囲を拡大することが可能な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 structure for preventing the peeling progress of a sandwich panel in which an arrester can be easily provided even after processing, and the applicable range can be expanded.
本発明は、発泡合成樹脂から成る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、
前記各面板の少なくとも一方の表面の亀裂発生部位における亀裂進展方向下流側に、前記面板と同一材料である繊維強化複合材料の前駆体であるプリプレグを貼付け、前記面板と一体化された面状アレスタが設けら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 foamed core made of a foamed synthetic resin.
A planar arrester integrated with the face plate by pasting a prepreg, which is a precursor of a fiber-reinforced composite material that is the same material as the face plate, on the downstream side in the crack propagation direction at the crack occurrence site of at least one surface of each face plate Is provided for preventing the peeling progress of the sandwich panel.
本発明に従えば、発泡合成樹脂から成る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。各面板の少なくとも一方の表面には、亀裂発生部位における亀裂進展方向下流側の領域に、面板と同一材料である繊維強化複合材料の前駆体であるプリプレグを貼付け、前記面板と一体化された面状アレスタが設けられる。 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 foamed core made of foamed synthetic resin. At least one surface of each face plate is a surface integrated with the face plate by attaching a prepreg which is a precursor of a fiber reinforced composite material, which is the same material as the face plate , in a region downstream of the crack propagation direction at the crack occurrence site. -Like arresters are provided.
面状アレスタと面板とが共通な繊維強化複合材料によって形成されているので、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、簡便に剥離の発生または進展を抑制することができる。したがって面状アレスタによって、面板と発泡コアとの間の剥離を防止することができる。しかも、前記従来技術とは異なり、成形後に追加取付可能なので、適用範囲を広げることができる。 Since the planar arrester and the face plate are made of a common fiber-reinforced composite material, the face plate and the arrester have a uniform material structure, so that the load can be distributed over a wide range and high local stress Generation | occurrence | production can be prevented and generation | occurrence | production or progress of peeling can be suppressed simply. Therefore, peeling between the face plate and the foam core can be prevented by the planar arrester. In addition, unlike the prior art, additional attachment is possible after molding, so the applicable range can be expanded.
また本発明の面状アレスタは、前記亀裂発生部位を外囲するように設けられることを特徴とする。 The planar arrester of the present invention is provided so as to surround the crack occurrence site.
本発明に従えば、亀裂発生部位を外囲するように面状アレスタが設けられるので、運用時の損傷に起因する面板と発泡コアとの間の剥離の発生または進展を、簡便に防止することができる。 According to the present invention, since the planar arrester is provided so as to surround the crack occurrence site, it is possible to easily prevent the occurrence or progress of separation between the face plate and the foam core due to damage during operation. Can do.
本発明によれば、少なくとも一方の面板の表面に面状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、サンドイッチパネルの製造作業および応急修理を容易化し、生産性を向上して、簡便に剥離の発生または進展を抑制することができる。
また、面状アレスタと面板とが共通な繊維強化複合材料によって形成されるので、面状アレスタと面板とを一体化し、剥離先端のエネルギを面状アレスタと面板とに分散し、より一層確実に剥離の発生または進展を防止することができる。
According to the present invention, the planar arrester is formed on the surface of at least one face plate with a material having rigidity higher than that of the foamed core, so that the sandwich panel manufacturing work and emergency repair can be facilitated, productivity can be improved, and In addition, the occurrence or progress of peeling can be suppressed.
In addition, since the planar arrester and the face plate are formed of a common fiber-reinforced composite material, the planar arrester and the face plate are integrated, and the energy at the peeling tip is distributed to the planar arrester and the face plate, making it even more reliable. Generation or progress of peeling can be prevented.
また本発明によれば、亀裂発生部位を外囲するように面状アレスタが設けられるので、面板と発泡コアとの間の剥離の発生または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 planar arrester is provided so as to surround the crack occurrence site, it is possible to more reliably prevent the occurrence or progress of the peeling between the face plate and the foam core.
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の一部の断面斜視図であり、図２は図１の切断面線ＩＩ−ＩＩから見た拡大断面図である。航空機の機体または翼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、発泡合成樹脂から成る発泡コア２１と、発泡コア２１の厚み方向（図２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 perspective 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 as seen from a section line II-II in FIG. It is. A sandwich panel 20 that is suitably used as a structural material for an aircraft fuselage or wing includes a foam core 21 made of a foamed synthetic resin, and surfaces 25 on both sides in the thickness direction (vertical direction in FIG. 2) Y of the foam core 21. 26 and face plates 27 and 28 which are laminated on and integrally provided.
前記発泡コア２１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）またはポリビニルクロライド（ＰＶＣ），ポリメタクリルイミド（ＰＭＩ）等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 core 21 is made of a foamed synthetic resin material. As this foamed synthetic resin material, polyetherimide (PEI), polyvinyl chloride (PVC), polymethacrylimide (PMI) or the like 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，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. Further, 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 foam core 21 and cured by heating. As a result, the sandwich panel 20 is formed.
一方の面板２７の表面には、亀裂発生部位２４を外囲するように、発泡コア２１よりも剛性の高い材料から成る面状アレスタ３２が形成される。このような面状アレスタ３２は、亀裂発生部位２４における亀裂進展方向下流側に、面板２７，２８と同様な繊維強化複合材料の前駆体であるプリプレグを貼付け、加熱装置によって加熱することによって前記一方の面板２７と一体化させることができる。本実施の形態では、亀裂発生部位２４には、無数の亀裂が多方向に発生した状態を想定し、亀裂発生部位２４の四方を取囲むように面状アレスタ３２が設けられる。 On the surface of one face plate 27, a planar arrester 32 made of a material having higher rigidity than the foam core 21 is formed so as to surround the crack generation site 24. Such a planar arrester 32 has a prepreg, which is a precursor of a fiber-reinforced composite material similar to the face plates 27 and 28, attached to the downstream side in the crack propagation direction at the crack occurrence site 24, and is heated by a heating device. The face plate 27 can be integrated. In the present embodiment, the cracking sites 24, a state in which numerous cracks occurs in multiple directions and virtual constant, planar arrester 32 so as to surround the four sides of the crack generation site 24 is provided.
このように面状アレスタ３２を各面板２７，２８の素材である繊維強化複合材料と同一材料を用いることによって、各面板２７，２８と面状アレスタ３２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、剥離の発生または進展を抑制することができる。 In this way, by using the same material as the fiber reinforced composite material that is the material of the face plates 27 and 28 for the face arrester 32, each face plate 27 and 28 and the face arrester 32 have a uniform material 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 occurrence or progress of peeling can be suppressed.
図３は面状アレスタ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は解析モデル３５へのモードＩＩ負荷形態を示す図である。本件発明者は、面状アレスタ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）解析によって面状アレスタ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 of the planar 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 the mode II load form to 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 progress of peeling by the planar arrester 32, and performs a planar arrester by finite element method (FEM) analysis. The effect of preventing peeling progress by 32 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を介して発泡コア２１の各表面２５，２６に接着され、一方の面板２７の表面には面状アレスタ３２が設けられる。面状アレスタ３２の断面形状は長方形であり、樹脂層３６はアレスタ３２と面板２７の間に介在されていない。各面板２７，２８は、発泡コア２１寄りの厚み方向Ｙ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, face plates 27, 28 are laminated on both sides in the thickness direction Y of the foam core 21, and the face plates 27, 28 are bonded to the surfaces 25, 26 of the foam core 21 via the resin layer 36. A surface arrester 32 is provided on the surface of 27. The cross-sectional shape of the planar arrester 32 is rectangular, and the resin layer 36 is not interposed between the arrester 32 and the face plate 27. Each of the face plates 27 and 28 includes a first layer disposed in the thickness direction Y near the foam core 21 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は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、面方向Ｘの幅Ｗが３０ｍｍ、厚さｔが１．５２ｍｍの面状アレスタ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、発泡コア２１と面板２７との間、さらに詳しくは発泡コア２１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 width W in the surface direction X is 30 mm and the thickness t is at a distance L1 from the end surface of one end of the surface direction X. A 1.52 mm planar arrester 32 is provided. 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, the foam core 21 is described in more detail. And a resin layer 36 to which one face plate 27 is bonded, it is assumed that a peeling 37 having a peeling length a occurs.
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Ｙ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の表面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Ｙ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 mode, the position Ps1 at the corner where the end surface of one end portion in the surface direction X intersects the surface of the other face plate 28 is supported so as to prevent displacement in the surface direction X and the thickness direction Y. This is a load configuration in which a peeling force F1 in the thickness direction Y from the other face plate 28 toward the one face plate 27 is applied to a corner position Pf1 where the end face of one end portion of the face direction X intersects the surface of the one face plate 27. .
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に移動自在に支持する第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。 That is, the first movable fulcrum 41 that supports one end of the surface direction X of the sandwich panel 20 movably in the surface direction X from below, and the lower end of the one end of the surface direction X of the sandwich panel 20 has a thickness from one side in the surface direction X. A second movable fulcrum 42 that is movably supported in the direction Y, and a third movable fulcrum 43 that movably supports one end of the surface direction X of the sandwich panel 20 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.
前記モードＩＩ負荷形態は、発泡コア２１の表面２６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Ｙ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 closer to the inside of the surface direction X by distances L2 and L3 from the respective end surfaces of the both ends of the surface direction X on the surface 26 of the foamed core 21 are the surface direction X and thickness. In a state of supporting the displacement in the direction Y to prevent the foam core 21 of the one face plate 27, the face direction X center position Pf2 on the surface opposite to the foam core 21, from one face plate 27 toward the other face plate 28, It is a load form which 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の位置から面方向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Ｙに移動自在に第５可動支点４５によって支持する。また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Ｙに移動自在に第６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Ｙに移動自在に第７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である。 That is, the sandwich panel 20 is supported by the fourth movable fulcrum 44 that is movable inwardly along the surface direction X from the position of the distance L2 inward from the end surfaces at both ends in the surface direction X of the sandwich panel 20, and the lower surface of the sandwich panel 20 is supported at one end in the surface direction X. It is supported by the fifth movable fulcrum 45 so as to be movable in the thickness direction Y from one side in the plane direction X at a distance L2 inward from the end face of the section. Further, a position at a distance L3 is supported by the sixth movable fulcrum 46 so as to be movable in the surface direction X inward from the end surface of the other end portion of the sandwich panel 20 in the surface direction X. A position at a distance L3 inward from the end face is supported by a sixth movable fulcrum 47 movably in the thickness direction Y from one side in the plane direction X on the lower face, and the sandwich panel 20 is placed on the upper face of the center (L0 / 2) of the total length L0. This position Pf2 is supported from the one side in the plane direction X by the seventh movable fulcrum 48 so as to be movable in the thickness direction Y, and a shearing force F2 is applied to the center position Pf2 from above. The distances L2 and L3 are 50 mm.
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、面板２７と同じ材料を基材とする繊維強化複合材料（ＣＦＲＰ）から成る面状アレスタ３２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. In the figure, the G value of the sandwich panel 20 provided with a planar arrester 32 made of a fiber reinforced composite material (CFRP) based on the same material as the face plate 27 is shown, and the horizontal axis is the peel length a, The vertical axis is the G value.
同図において、符号「□」を結ぶライン５１は、面状アレスタが設けられない場合のＧ値を示し、符号「◇」で示す点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面状アレスタ３２を設けた場合のＧ値を示す。なお、負荷荷重は、Ｆ１＝１００Ｎである。 In the figure, a line 51 connecting the reference symbol “□” indicates the G value when the planar arrester is not provided, and a point 52 indicated by the reference symbol “◇” is a reinforced fiber in one direction (UD 90 degrees). The G value at the time of providing the planar arrester 32 which consists of a fiber reinforced composite material used as is shown. The load is F1 = 100N.
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、面板２７と同じ材料を基材とした繊維強化複合材料から成る面状アレスタ３２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。なお、負荷荷重は、Ｆ２＝１０００Ｎである。 FIG. 7 is a graph showing the relationship between the separation length a and the energy release rate G with respect to the load in the mode II load configuration. In this figure, the G value when a planar arrester 32 made of a fiber reinforced composite material made of the same material as the face plate 27 is provided is shown, the horizontal axis shows the peeling length a, and the vertical axis shows G Indicates the value. The load is F2 = 1000N.
同図において、符号「□」を結ぶライン６１は、面状アレスタが設けられない場合のＧ値比を示し、符号「◇」で示す点６２は、繊維強化複合材料から成る面状アレスタ３２を設けた場合のＧ値を示す。 In the figure, a line 61 connecting the reference symbol “□” indicates the G value ratio when the planar arrester is not provided, and a point 62 indicated by the symbol “◇” indicates the planar arrester 32 made of a fiber-reinforced composite material. The G value when provided is shown.
図６，７において、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、面方向Ｘ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。 6 and 7, the peeling length a is a distance b from the support position Ps21 near the end face of the one end portion in the plane direction X to the tip 37a of the peel 37, and from the end face of one end portion in the plane direction X to the support position Ps21. A value obtained by adding the distance L2 (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が面状アレスタ３２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、モードＩ負荷形態では、剥離３７の先端３７ａのエネルギ解放率Ｇが約２７％低減することが確認されるが、モードＩＩ負荷形態ではほとんど低減効果がないことが判った。このことから、モードＩ負荷形態が支配的な部位、たとえば圧縮荷重負荷時に面板２７が面外方向に変形して生じるピール荷重によって剥離が進展する部位に適用すると、容易かつ安価に剥離の進展を抑制することができる。特に、圧縮荷重が負荷される部位に損傷による剥離が発生し、その剥離を起点とする亀裂の進展を抑制する必要がある場合には、図１に示すように、剥離が発生した亀裂発生部位２４に、２次的に面状アレスタ３２を設けて、応急修理をすることができる。 As shown in FIG. 6 and FIG. 7, when the peeling length a is changed and the tip 37 a of the peeling 37 exists at a position away from the planar arrester 32, and when it exists at a close position, G As a result of obtaining each value, it was confirmed that the energy release rate G of the tip 37a of the peeling 37 was reduced by about 27% in the mode I load form, but there was almost no reduction effect in the mode II load form. . Therefore, mode I load form is dominant sites, for example, when face plate 27 during compressive load load is applied to the site of progression peeling the peel loads generated by variations in the out-of-plane direction, the development of easily and inexpensively peeling Can be suppressed. In particular, in the case where peeling due to damage occurs in a portion to which a compressive load is applied and it is necessary to suppress the progress of a crack starting from the peeling, as shown in FIG. 24, a planar arrester 32 can be provided secondarily for emergency repair.
２０ サンドイッチパネル
２１ 発泡コア
２５，２６ 表面
２７，２８ 面板
３２ 面状アレスタ
20 Sandwich panel 21 Foam core 25, 26 Surface 27, 28 Face plate 32 Planar arrester
Claims (2)
前記各面板の少なくとも一方の表面の亀裂発生部位における亀裂進展方向下流側に、前記面板と同一材料である繊維強化複合材料の前駆体であるプリプレグを貼付け、前記面板と一体化された面状アレスタが設けら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 the sandwich panel formed integrally with each face on the both sides in the thickness direction of the foamed core made of the foamed synthetic resin in a state where the face plate made of the fiber reinforced composite material is laminated,
A planar arrester integrated with the face plate by pasting a prepreg, which is a precursor of a fiber-reinforced composite material that is the same material as the face plate, on the downstream side in the crack propagation direction at the crack occurrence site of at least one surface of each face plate A structure for preventing the peeling progress of the sandwich panel.
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| JP5036853B2 (en) * | 2010-08-30 | 2012-09-26 | 防衛省技術研究本部長 | Flying object separation structure and separation method |
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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 |
| US20070169829A1 (en) * | 2006-01-23 | 2007-07-26 | Prabhat Krishnaswamy | Soft crack arrestors for pipelines |
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| CN106828865B (en) * | 2017-03-01 | 2019-04-02 | 山东长空雁航空科技有限责任公司 | Crossbeam and its forming method on fuselage |
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