JP7187378B2 - Adhesive member, method for forming adhesive member, and method for forming adhesive layer - Google Patents

Description

The present invention relates to an adhesive member, a method for forming an adhesive member, and a method for forming an adhesive layer.

Conventionally, it is known to bond two members together with an adhesive layer to form an adhesive member. For example, in Patent Document 1, a first fiber portion and a second fiber portion are arranged between a first member and a second member, and a bonding portion is provided between the first fiber portion and the second fiber portion. An adhesive structure is disclosed that adheres to In this bonding structure, the first fiber portion and the second fiber portion are arranged to extend in the out-of-plane direction between the first member and the second member.

WO2016/129570

In an adhesive structure in which the first member and the second member are bonded to the adhesive layer (adhesive portion), when a load is applied, the adhesive layer cracks (particularly, peeling at the interface between the first member and the second member and the adhesive layer). ) may occur. In the bonded structure described in Patent Document 1, the first fiber portion and the second fiber portion extend in the out-of-plane direction between the first member and the second member, thereby preventing cracks occurring in the bonded portion. The extension is suppressed by the first fiber portion and the second fiber portion. However, if the fibers are arranged to extend in the out-of-plane direction in the adhesive layer, the in-plane properties of the adhesive member may be affected, such as a decrease in resistance to tensile loads in the in-plane direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to suppress the propagation of cracks occurring in the adhesive layer without affecting the in-plane characteristics of the adhesive member.

In order to solve the above-described problems and achieve the object, the present invention provides a first member, a second member, an adhesive layer containing an adhesive for bonding the first member and the second member, and a crack growth suppression member disposed in the adhesive layer and configured to suppress propagation of a crack in the in-plane direction in the adhesive layer, wherein the crack growth suppression member extends from the first member side to the second crack growth suppression member; It has a progress suppressing portion that exhibits a convex shape in the in-plane direction toward the two member side, and the adhesive strength at the interface with the adhesive layer is greater than the adhesive strength at the interface between the adhesive layer and the first member and the second member. is also weak.

With this configuration, the adhesive strength at the interface between the adhesive layer and the crack growth suppressing member is weaker than the adhesive strength at the interface between the adhesive layer and the first member and the second member. A directed crack can be induced to the interface between the adhesive layer and the crack growth restraint member. Then, the crack guided to the growth restraining portion of the crack growth restraining member propagates in the out-of-plane direction due to the convex shape of the growth restraining portion. As a result, the crack propagation resistance in the in-plane direction is increased, and the crack propagation is suppressed. In other words, it is possible to suppress the propagation of cracks without arranging the fibers in the adhesive layer so as to extend in the out-of-plane direction. Therefore, according to the present invention, it is possible to suppress the propagation of cracks generated in the adhesive layer without affecting the in-plane properties of the adhesive member.

Moreover, it is preferable that the progress suppressing portion is a curved portion having the convex shape. With this configuration, it is possible to increase the resistance to crack propagation in the in-plane direction while smoothly inducing the crack by the propagation suppressing portion.

Moreover, it is preferable that the crack growth suppression member further includes a guiding portion extending along the in-plane direction from an end portion of the crack growth suppression portion. With this configuration, a crack occurring in the adhesive layer and extending in the in-plane direction can be more reliably guided to the guiding portion.

Further, it is preferable that a plurality of crack growth suppression members be arranged along the in-plane direction. With this configuration, it is possible to arrange a plurality of crack growth suppression members over a wider range, so that it is possible to more reliably suppress the propagation of cracks in the in-plane direction in the adhesive layer.

Moreover, it is preferable that at least some of the adjacent crack growth suppression members are arranged such that the convex shapes of the crack growth suppression portions face opposite directions to each other. With this configuration, the crack propagation suppression members arranged facing opposite directions can more reliably suppress the propagation of the crack regardless of which of the two directions the crack faces.

Further, it is preferable that the crack growth suppression member is formed such that the crack growth suppression portion is continuously formed in an annular shape. With this configuration, even if a crack propagates in any in-plane direction in the adhesive layer, the propagation can be more reliably suppressed.

Moreover, it is preferable that a plurality of the crack growth suppression members are connected via a connecting portion. With this configuration, a plurality of crack growth suppression members can be handled as one member. Further, for example, even if the resin contained in the adhesive layer is softened when the first member, the second member and the adhesive layer are adhered, the existence of the connecting portion between the plurality of crack growth suppressing members prevents cracks from forming. It is possible to suppress the crack growth suppression member from flowing within the adhesive layer.

In order to solve the above-described problems and achieve the object, the present invention provides a first member preparing step of preparing a first member, a second member preparing step of preparing a second member, the first member and the and a bonding step of bonding the second member with an adhesive layer containing an adhesive, wherein the adhesive layer includes a crack growth suppression member that suppresses the propagation of a crack in the in-plane direction within the adhesive layer. is arranged, and the crack growth suppression member has a growth suppression portion having a convex shape in the in-plane direction from the first member side to the second member side, and the interface adhesion with the adhesive layer The adhesive strength is weaker than the adhesive strength of the interface between the adhesive layer and the first member and the second member.

With this configuration, the adhesive strength at the interface between the adhesive layer and the crack growth suppressing member is weaker than the adhesive strength at the interface between the adhesive layer and the first member and the second member. A directed crack can be induced to the interface between the adhesive layer and the crack growth restraint member. Then, the crack guided to the growth restraining portion of the crack growth restraining member propagates in the out-of-plane direction due to the convex shape of the growth restraining portion. As a result, the crack propagation resistance in the in-plane direction is increased, and the crack propagation is suppressed. In other words, it is possible to suppress the propagation of cracks without arranging the fibers in the adhesive layer so as to extend in the out-of-plane direction. Therefore, according to the present invention, it is possible to suppress the propagation of cracks generated in the adhesive layer without affecting the in-plane properties of the adhesive member.

In order to solve the above-described problems and achieve the object, the present invention provides a method for forming an adhesive layer for forming an adhesive layer containing an adhesive for bonding a first member and a second member, comprising: A plurality of crack growth suppression members are connected via connecting portions by cutting along a plurality of cut lines and bending along a plurality of folding lines to suppress the propagation of cracks in the in-plane direction in the adhesive layer. The crack growth suppression member is impregnated with a resin containing the adhesive to form the adhesive layer, and the crack growth suppression member extends from the first member side to the second member side. It has an inwardly convex expansion suppressing portion, and the adhesive strength of the interface with the adhesive layer is weaker than the adhesive strength of the interfaces between the adhesive layer and the first member and the second member. do.

With this configuration, it is possible to easily form an adhesive layer including a plurality of connected crack growth suppression members. Also, a plurality of crack growth suppression members can be handled as one member. Further, for example, even if the resin contained in the adhesive layer is softened when the first member, the second member and the adhesive layer are adhered, the existence of the connecting portion between the plurality of crack growth suppressing members prevents cracks from forming. It is possible to suppress the crack growth suppression member from flowing within the adhesive layer.

In order to solve the above-described problems and achieve the object, the present invention provides a method for forming an adhesive layer for forming an adhesive layer containing an adhesive for bonding a first member and a second member, wherein the adhesive layer A plurality of film-like members containing the adhesive are adhered around the crack growth suppression member that suppresses the propagation of a crack in the in-plane direction to form the adhesive layer, and the crack growth suppression member has a progress suppressing portion that exhibits a convex shape in the in-plane direction from the first member side to the second member side, and the adhesive strength at the interface with the adhesive layer is the adhesive layer, the first member, and the It is characterized by being weaker than the adhesive strength of the interface with the second member.

With this configuration, it is possible to easily form the adhesive layer including the crack growth suppressing member.

FIG. 1 is a cross-sectional view showing a composite material as an adhesive member according to an embodiment. FIG. 2 is an enlarged cross-sectional view showing an enlarged main part of a composite material as an adhesive member according to the embodiment. FIG. 3 is a cross-sectional view showing a composite material according to a modification of the embodiment; FIG. 4 is a cross-sectional view showing a composite material including a crack growth suppression member according to a first modification. FIG. 5 is a cross-sectional view showing a composite material including a crack growth suppression member according to a first modification. FIG. 6 is a front view showing a crack growth suppression member according to a second modification. 7 is an end view along line AA of FIG. 6. FIG. FIG. 8 is a cross-sectional view showing another configuration example of the crack growth suppression member according to the second modification. FIG. 9 is a cross-sectional view showing a crack growth suppression member according to a third modification. FIG. 10 is an explanatory diagram showing a crack growth suppression member according to a fourth modification. FIG. 11 is an explanatory diagram showing the base material of the crack growth suppression member. FIG. 12 is an explanatory diagram showing how a resin film is arranged around the crack growth suppression member.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an adhesive member, a method for forming an adhesive member, and a method for forming an adhesive layer according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

FIG. 1 is a cross-sectional view showing a composite material as an adhesive member according to an embodiment. A composite material 100 as an adhesive member according to the embodiment is a composite material used in various fields such as aircraft. The composite material 100 includes a first composite member 10A as a first member, a second composite member 10B as a second member, and an adhesive layer 20. As shown in FIG. The first composite member 10A and the second composite member 10B are adhered via the adhesive layer 20 . In the following description, the direction in which the first composite member 10A, the second composite member 10B, and the adhesive layer 20 are arranged (vertical direction shown in FIG. 1) is referred to as the "out-of-plane direction Z" of the composite material 100. The direction orthogonal to the composite material 100 (the left-right direction shown in FIG. 1) is called the “first in-plane direction X” of the composite material 100, and the direction orthogonal to the first in-plane direction X and the out-of-plane direction Z is the “second direction” of the composite material 100. In-plane direction Y”.

The first composite member 10A and the second composite member 10B are laminates obtained by laminating a plurality of composite material layers 11 in which reinforcing fibers such as carbon fibers are impregnated with resin. The adhesive layer 20 is arranged between the first composite member 10A and the second composite member 10B, and adheres the first composite member 10A and the second composite member 10B. The adhesive layer 20 is made of, for example, a resin material containing an adhesive.

The composite material 100 according to the embodiment includes a first member preparation step of preparing the first composite member 10A, a second member preparation step of preparing the second composite member 10B, the first composite member 10A and the second composite member 10B are formed by performing a bonding step of bonding and bonding with the bonding layer 20 . In this embodiment, in the first member preparing step and the second member preparing step, a first composite member 10A and a second composite member 20B are prepared by laminating a plurality of composite material layers 11 and curing the resin. Then, in the bonding step, the adhesive layer 20 is arranged between the first composite member 10A and the second composite member 20B after the resin has been cured, and the first composite member 10A and the second composite member 10B are bonded together by the adhesive layer 20. Glue with Note that the first composite member 10A and the second composite member 10B before resin curing (prepreg state) are prepared in the first member preparation step and the second member preparation step, and the first composite member 10A and the second composite member 10B are prepared in the bonding step. The first composite member 10A and the second composite member 10B may be cured at the same time as the bonding by disposing the adhesive layer 20 between the members 10B and bonding the members 10B together with heating.

Here, when a load acts on the composite material 100 , cracks in the first in-plane direction X or the second in-plane direction Y may occur in the adhesive layer 20 . Cracks are particularly likely to occur as delamination at the interface between the first composite member 10A or the second composite member 10B and the adhesive layer 20 . Therefore, the composite material 100 according to the embodiment includes a crack propagation suppression member 30 in addition to the above configuration in order to suppress propagation of cracks generated in the adhesive layer 20 .

The crack growth suppression member 30 is formed of, for example, metal foil and arranged in the adhesive layer 20 . The crack growth suppression member 30 is arranged in the composite material 100 at a location where a crack is likely to occur and where crack growth should be stopped. In the composite material 100 , locations where cracks are likely to occur and crack growth should be stopped are specified in the design stage of the composite material 100 . Similarly, which direction, the first in-plane direction X or the second in-plane direction Y, the crack propagates is specified in the design stage of the composite material 100 . The configuration of the crack growth suppression member 30 will be described below, taking as an example a case where a crack propagates in one of the first in-plane directions X (to the right in FIG. 2).

FIG. 2 is an enlarged cross-sectional view showing an enlarged main part of a composite material as an adhesive member according to the embodiment. The crack growth suppression member 30 has two guiding portions 31 and a growth suppression portion 32 as illustrated. The two guide portions 31 extend along the first in-plane direction X while facing each other within the adhesive layer 20 . In addition, in the example shown in FIG. 1 , the guiding portion 31 is schematically shown in a linear shape, but the shape of the guiding portion 31 is not limited to this. “Extending in the direction along the first in-plane direction X” means that the guide portion 31 extends mainly along the first in-plane direction X, and It may extend obliquely and may not be perfectly straight.

The progress suppressing portion 32 is provided at one end of the two guiding portions 31 and extends between the two guiding portions 31 . In other words, the two guiding portions 31 extend along the first in-plane direction X from the end portion of the progression suppressing portion 32 . As shown in FIG. 1 , the propagation suppressing portion 32 extends between the two guide portions 31 in a convex shape toward the side where the crack C in the first in-plane direction X propagates. That is, the progress suppressing portion 32 has a convex shape in the first in-plane direction X from the first composite member 10A side to the second composite member 10B side. In the present embodiment, the progression suppressing portion 32 is a semicircular curved portion having a convex shape with a predetermined radius of curvature. When the progress suppressing portion 32 is semicircular, the upper limit of the radius of curvature is slightly smaller than half the thickness of the adhesive layer 20 . However, the progress suppressing portion 32 is not limited to a semicircular shape, and may be an arc-shaped convex portion formed with a predetermined radius of curvature. Further, the progression suppressing portion 32 may have a radius of curvature that changes in the middle. Thereby, as shown in FIG. 1 , the crack growth suppression member 30 exhibits a U-shaped cross section with the two guiding portions 31 and the growth suppression portion 32 . The width of the crack growth suppression member 30 in the second in-plane direction Y may be appropriately determined in accordance with the size of the composite material 100, the range of locations where crack growth should be stopped, and the like.

In the crack growth suppression member 30, the adhesion strength between the interface with the adhesive layer 20, that is, the surface 33 with the adhesive layer 20 is the adhesion of the interface between the adhesive layer 20 and the first composite member 10A and the second composite member 10B. It is set weaker than strength. The adhesive strength of the surface 33 of the crack growth suppression member 30 to the adhesive layer 20 can be adjusted, for example, by adjusting the material composition or chemically treating the surface 33 . In this embodiment, the crack growth suppression member 30 is made of metal foil. Note that the crack growth suppression member 30 may be formed of a material other than a metal material as long as the adhesive strength between the surface 33 and the adhesive layer 20 can be made appropriate.

Next, the action of the composite material 100 as an adhesive member according to the embodiment will be described. Assume that a load is applied to the composite material 100 and a crack C (peeling) occurs at the interface between the first composite member 10A and the adhesive layer 20, for example. At this time, the crack C propagates along the first in-plane direction X. As described above, the adhesive strength between the surface 33 and the adhesive layer 20 is weaker than the adhesive strength at the interface between the adhesive layer 20 and the first composite member 10A and the second composite member 10B. Therefore, the crack C generated in the adhesive layer 20 is guided to the surface 33 with weaker adhesive strength, as shown in FIG. At this time, since the guide portion 31 extends along the first in-plane direction X, the portion that guides the crack C can be provided in a relatively long range, and the crack C is formed on the surface 33 of the guide portion 31. can be guided more reliably.

The crack C guided to the guiding portion 31 is further guided to the surface 33 of the growth suppressing portion 32 . Then, the crack C guided to the propagation suppressing portion 32 is guided along the propagation suppressing portion 32 toward the out-of-plane direction Z side. As a result, the tip of the crack C has a shape with a large bending radius, and the degree of stress concentration is reduced, thereby increasing the resistance to propagation of the crack C in the first in-plane direction X and suppressing its propagation. As a result, the propagation of the crack C is stopped halfway through the propagation suppressing portion 32 .

Here, when the growth suppressing portion 32 changes too steeply from the guide portion 31, the crack C is not smoothly guided from the guide portion 31 to the progress suppressing portion 32, and propagates along the first in-plane direction X. there's a possibility that. On the other hand, if the growth suppressing portion 32 changes too gently from the guiding portion 31, in other words, if the convex shape becomes too sharp, the resistance to propagation of the crack C in the first in-plane direction X increases sufficiently. do not do. Therefore, there is a possibility that the growth of the crack C cannot be stopped as a result. Therefore, the propagation suppressing portion 32 can guide the crack C, which has propagated along the surface 33 of the guiding portion 31, along the surface 33 in the out-of-plane direction Z, and It is formed at an angle whose progress can be stopped by increasing resistance to progress in direction X.

Note that FIG. 2 describes an example in which the crack C is induced on the surface 33 on one side of the crack growth suppression member 30 . However, even on the surface 34 on the other side of the crack growth suppression member 30, if the adhesive strength with the adhesive layer 20 is weaker than the adhesive strength at the interface between the adhesive layer 20 and the first composite member 10A and the second composite member 10B , a crack C may be induced in the surface 34 on the other side. In this case as well, the crack C induced to the surface 34 on the other side reaches the growth suppressing portion 32 , so that the resistance to growth in the first in-plane direction X increases and the growth is stopped. Note that the adhesive strength between the surface 33 and the adhesive layer 20 and the adhesive strength between the surface 34 and the adhesive layer 20 may be different values, and at least one of them may be the adhesive layer 20 and the first composite member 10A. and the adhesive strength of the interface with the second composite member 10B. Furthermore, the adhesive strength with the adhesive layer 20 may be distributed at arbitrary positions on the surfaces 33 and 34 .

As described above, the composite material 100 as the adhesive member according to the embodiment includes the first composite member (first member) 10A, the second composite member (second member) 10B, the first composite member 10A and the second An adhesive layer 20 containing an adhesive that bonds the two composite members 10B together, and a crack growth suppression that is disposed in the adhesive layer 20 and suppresses the propagation of the crack C in the adhesive layer 20 in the first in-plane direction X. and a member 30, the crack growth suppressing member 30 has a convex shape in the first in-plane direction X from the first composite member 10A side to the second composite member 10B side, and has an adhesive layer 20, that is, the adhesive strength of the surface 33 is weaker than the adhesive strength of the interfaces between the adhesive layer 20 and the first composite member 10A and the second composite member 10B.

With this configuration, the adhesive strength at the interface between the adhesive layer 20 and the crack growth suppressing member 30 is weaker than the adhesive strength at the interface between the adhesive layer 20 and the first composite member 10A and the second composite member 10B. can be guided to the interface between the adhesive layer 20 and the crack growth suppressing member 30 . Then, the crack guided to the propagation suppressing portion 32 of the crack propagation suppressing member 30 propagates in the out-of-plane direction Z due to the convex shape of the propagation suppressing portion 32 . As a result, the resistance to propagation of the crack C in the first in-plane direction X increases, and propagation of the crack C is suppressed. That is, it is possible to suppress the propagation of the crack C without arranging the fibers in the adhesive layer 20 so as to extend in the out-of-plane direction. Therefore, according to the embodiment, it is possible to suppress the propagation of the crack C generated in the adhesive layer 20 while preventing the in-plane characteristics of the composite material (adhesive member) 100 from being affected.

In addition, if a plurality of crack growth suppression members 30 are arranged in the adhesive layer 20 of the composite material 100, it is possible to easily determine the necessity of repair according to the degree of crack C growth. That is, the crack propagates to the location where one of the plurality of crack growth suppression members 30 is arranged, but the crack propagates to the location where the other crack growth suppression members 30 are arranged. It is possible to confirm the degree of progress of the crack C, such as that the crack C has not occurred, and to judge the necessity of repair according to the result.

Further, the progress suppressing portion 32 is a curved portion having a convex shape. With this configuration, the crack C can be smoothly guided by the propagation suppressing portion 32, and the propagation resistance of the crack C in the first in-plane direction X can be increased.

Further, the crack growth suppressing member 30 further has a guiding portion 31 extending along the first in-plane direction X from the end portion of the crack propagation suppressing portion 32 . With this configuration, the crack C generated in the adhesive layer 20 and directed in the first in-plane direction X can be more reliably guided to the guiding portion 31 . However, if the crack C generated in the adhesive layer 20 can be guided to the surface 33 of the crack growth suppressing portion 32 , the guiding portion 31 may be omitted from the crack growth suppressing member 30 . Moreover, rather than completely omitting the guide portion 31 from the crack growth suppression member 30, the length of the guide portion 31 may be made shorter than in the example shown in FIG.

1 and 2 show an example in which one crack growth suppression member 30 is arranged in the adhesive layer 20, but the arrangement configuration of the crack growth suppression member 30 is not limited to this. FIG. 3 is a cross-sectional view showing a composite material according to a modification of the embodiment; The configuration of the composite material 200 according to the modified example is the same as that of the composite material 100 except for what will be described below. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted.

In the composite material 200 according to the modified example, a plurality of crack growth suppressing members 30 are arranged along the first in-plane direction X in the adhesive layer 20 as illustrated. With this configuration, the plurality of crack growth suppression members 30 can be arranged in a wider range, so that the growth of the crack C in the adhesive layer 20 in the first in-plane direction X can be suppressed more reliably. can be done. Further, in the composite material 200, the adjacent crack growth suppression members 30 are arranged such that the convex shapes of the crack growth suppression portions 32 face opposite directions to each other. With this configuration, even when the crack C is oriented in either of the two directions of the first in-plane direction X, the propagation of the crack can be suppressed more reliably.

Adjacent crack growth suppression members 30 may be arranged such that the convex shapes of the crack growth suppression portions 32 face the same direction. 3 shows an example in which two crack growth suppression members 30 are arranged in the adhesive layer 20, the crack growth suppression members 30 are arranged in the first in-plane direction X in the adhesive layer 20. three or more may be arranged. In that case, at least some of the adjacent crack growth suppressing members 30 may be arranged such that the convex shapes of the crack growth suppressing portions 32 face opposite directions to each other, or all the crack growth suppressing members 30 may 32 convex shapes may be arranged facing the same direction.

4 and 5 are cross-sectional views showing a composite material including a crack growth suppressing member according to a first modification. As shown in FIG. 4, a crack growth suppressing member 40 according to a first modified example is formed so as to draw a ring by providing the crack propagation suppressing portions 32 on both sides of the guiding portion 31 . With this configuration, one crack propagation suppression member 40 can more reliably suppress the propagation of the crack C regardless of which of the two directions of the first in-plane direction X the crack C faces. In addition, the crack growth suppression member 40 according to the second modification is obtained by folding back the base material that becomes one crack growth suppression member 40 in the middle, as shown in the range surrounded by the broken line in FIG. An overlapping portion 41 that partially overlaps may be formed.

FIG. 6 is a front view showing a crack growth suppressing member according to a second modification, and FIG. 7 is an end view along line AA of FIG. A crack growth suppression member 50 according to the second modification has only the crack growth suppression portion 32 . However, the crack growth suppressing member 60 is formed as a cylindrical member in which the crack progress suppressing portion 32 is continuously formed in an annular shape. In the example shown in FIG. 7 , the annular crack growth suppressing portion 32 has a convex shape toward the outside of the tubular crack growth suppressing member 60 . With this configuration, regardless of whether the crack C propagates in the first in-plane direction X or the second in-plane direction Y in the adhesive layer 20, the propagation can be more reliably suppressed. In particular, if a plurality of crack growth suppression members 50 are scattered in the adhesive layer 20 and arranged, the growth of the crack C can be suppressed more effectively.

Note that the configuration of the crack growth suppression member 50 is not limited to this. FIG. 8 is an end view showing another configuration example of the crack growth suppression member according to the second modification. As shown in the figure, the crack growth suppression member 50 may have an annular crack growth suppression portion 32 that protrudes toward the inner side of the tubular crack growth suppression member 50 . Moreover, the crack growth suppression member 50 may further include a guiding portion 31 that is continuously formed in an annular shape.

FIG. 9 is a cross-sectional view showing a crack growth suppression member according to a third modification. In the crack growth suppressing member 60 according to the third modified example, the crack growth suppressing portion 32 is formed in a polygonal shape by a plurality of straight portions 32A instead of curved portions. In this manner, the progression suppressing portion 32 may be configured by a plurality of linear portions 32A to have a convex shape. Note that the number of straight portions 32A shown in FIG. 9 is an example, and the progress suppressing portion 32 may be formed with more straight portions 32A, or the spread suppressing portion 32 may be formed with fewer straight portions 32A. good.

FIG. 10 is an explanatory diagram showing a crack growth suppression member according to a fourth modification. A crack growth suppressing member 70 according to a fourth modification includes a plurality of crack growth suppressing members 30 arranged side by side along the first in-plane direction X and the second in-plane direction Y, as shown in the figure. be. In addition, in the example shown in FIG. 10, the crack growth restraining portion 32 of the crack growth restraining member 30 includes the flat portion 321, but this is due to the formation method described later. The plurality of crack growth suppression members 30 are connected via connecting portions 71 . The connecting portion 71 is arranged in parallel with the flat portion 321 of the progression suppressing portion 32 and includes a stepped portion 711 connected to the flat portion 321 and a holding portion 712 extending between the stepped portions 711 along the first in-plane direction X. and With this configuration, the plurality of crack growth suppression members 30 can be handled as one member. Further, when bonding the first composite member 10A, the second composite member 10B, and the adhesive layer 20, even if the resin contained in the adhesive layer 20 is softened, for example, when the bonding is accompanied by heating, a plurality of cracks may occur. The presence of the connecting portions 71 (holding portions 712 ) between the crack growth suppression members 30 can suppress the crack growth suppression members 70 from flowing within the adhesive layer 20 .

Next, a method for forming the adhesive layer 20 according to the embodiment will be described. First, a method of forming an adhesive layer 20 including a crack growth suppression member 70 according to the fourth modification shown in FIG. 10 will be described with reference to FIGS. 10 and 11. FIG. FIG. 11 is an explanatory diagram showing the base material of the crack growth suppression member. As shown in FIG. 11, the base material 80 of the crack growth suppression member 70 is prepared. Although the base material 80 is a metal foil in this embodiment, it may be a material other than a metal material as long as the adhesive strength of the interface with the adhesive layer 20 can be appropriately adjusted as described above.

First, a plurality of cut lines L1, a plurality of first bending lines L2 and a plurality of second bending lines L1 for forming the crack growth suppressing members 30 and the connecting portions 71 included in the crack growth suppressing member 70 are formed in the base material 80. A folding line L3 is defined and drawn. A plurality of cutting lines L1 indicated by solid lines in FIG. 11 are lines for cutting the base material 80 . A plurality of first bending lines L2 indicated by dashed lines in FIG. 11 are lines for bending the base material 80 toward the back side in the paper surface direction of the drawing. A plurality of second bending lines L3 indicated by dashed lines in FIG. 11 are lines for bending the base material 80 toward the front side in the direction of the plane of the drawing.

Next, the base material 80 is cut along the cut line L1. Here, the surface 91 in the shaded range in FIG. 11 is the crack growth suppression member 30A in FIG. 10, and the surface 92 in the shaded range in FIG. 11 is the crack growth suppression member 30B in FIG. shall be. Moreover, as illustrated in FIG. 11, one of the cut lines L1 is called "cut line L11", and one of the cut lines L1 is called "cut line L11". At this time, as shown in FIG. 10, the portion cut by the cut line L11 is the end portion of the guide portion 31 included in the two crack growth suppression members 30A and 30B arranged along the first in-plane direction X. becomes the side of In addition, as shown in FIG. 10, the portions cut by the cut lines L12 become the sides of the crack growth suppression members 30A and 30B, and the sides of the holding portion 712 of the connecting portion 71. Become. In this way, by cutting all of the cut lines L1, the sides forming the contours of the plurality of crack growth suppression members 30 and the holding portion 712 of the connecting portion 71 are formed.

Further, the base material 80 is bent toward the back side in the paper surface direction along the plurality of first bending lines L2, and is bent toward the front side in the paper surface direction along the plurality of second bending lines L3. As a result, as shown in FIG. 10 , the area surrounded by the first bending line L2 becomes the flat portion 321 of the crack growth suppression member 30 . At this time, by bending the periphery of the flat portion 321 of the crack growth suppression member 30 so as to form a curved portion, the growth suppression portion 32 including the flat portion 321 is formed. A holding portion 712 of the connecting portion 71 is a range surrounded by the first bending line L2 and the second bending line L3. Thereby, the crack growth suppression member 70 is formed.

Then, the adhesive layer 20 is formed by impregnating the crack growth suppression member 70 formed by the above procedure with a resin containing an adhesive. The resin impregnation of the crack growth suppression member 70 may be performed by a well-known impregnation method.

With this configuration, it is possible to easily form the adhesive layer 20 including a plurality of crack growth suppression members 30 that are connected to each other. Moreover, as described above, the plurality of crack growth suppression members 30 can be handled as one member. Further, as described above, when the first composite member 10A, the second composite member 10B, and the adhesive layer 20 are adhered, even if the resin contained in the adhesive layer 20 softens, the crack growth suppression members 30 The presence of the connecting portion 71 (holding portion 712 ) therebetween can suppress the crack growth suppression member 70 from flowing within the adhesive layer 20 .

The technique of impregnating resin containing adhesive is also applied when forming the adhesive layer 20 on which the cylindrical crack growth suppression member 50 shown in FIGS. 6 to 8 is arranged.

Next, a method for forming the adhesive layer 20 including the crack growth suppressing member 30 of FIG. 1 will be described with reference to FIG. FIG. 12 is an explanatory diagram showing how a resin film is arranged around the crack growth suppression member. As shown in the figure, a plurality (for example, two layers) of resin films 25 containing an adhesive are stacked inside the crack growth suppression member 30 formed to have a U-shaped cross section, that is, on the other surface 34 side, and the gap is formed. It adheres to the surface 34 so that it cannot. Also, a plurality of (eg, two layers) of resin films 25 containing an adhesive are stacked on the outside of the crack growth suppression member 30 , that is, on one surface 33 side, and adhered to the surface 33 . As a result, in the example shown in FIG. 12 , four layers of resin films 25 are adhered to the inside and outside of the crack growth suppression member 30 . Then, the resin films 25 of the same number (four layers in the example shown in FIG. 12) as the resin films 25 adhered to the inside and outside of the crack growth suppression member 30 are attached to the crack growth suppression member 30 from the crack growth suppression portion 32 side. Glue so that there are no gaps. Thereby, the adhesive layer 20 shown in FIG. 1 is formed. Note that the resin film 25 may be a film-like member containing an adhesive, and may be an adhesive sheet, an adhesive tape, or the like.

With this configuration, the adhesive layer 20 including the crack growth suppression member 30 can be easily formed. As shown in FIG. 3, when a plurality of crack growth suppression members 30 are arranged on the adhesive layer 20, a plurality of adhesive layers 20 formed by the formation method shown in FIG. 12 may be connected. Further, this forming method can also be applied when forming the adhesive layer 20 including the crack growth suppressing member 40 of FIGS. 4 and 5 and the crack growth suppressing member 60 of FIG. The adhesive layer 20 including the crack growth suppression members 30, 40, and 60 may also be formed by impregnating the crack growth suppression member 30 with a resin containing an adhesive.

In this embodiment, the adhesive member according to the embodiment has been described by taking as an example the composite material 100 including the first composite member 10A as the first member and the second composite member 10B as the second member. However, the adhesive member may be a non-composite material in which one or both of the first member and the second member are made of, for example, a metal material, a foam core material, a honeycomb core material, a resin material, or the like.

10A First composite member 10B Second composite member 11 Composite material layer 20 Adhesive layer 25 Resin film 30, 30A, 30B, 40, 50, 60, 70 Crack growth suppression member 31 Guidance part 32 Growth suppression part 321 Flat part 32A Straight line Part 33, 34 Surface 41 Overlap Part 71 Connection Part 711 Stepped Part 712 Holding Part 80 Base Material 91, 92 Surface 100, 200 Composite Material C Crack L1, L11, L12 Slit Line L2 First Fold Line L3 Second Fold Line X First in-plane direction Y Second in-plane direction Z Out-of-plane direction

Claims (10)

a first member;
a second member;
an adhesive layer containing an adhesive that bonds the first member and the second member;
a crack growth suppressing member disposed in the adhesive layer and suppressing crack propagation in the in-plane direction in the adhesive layer;
with
The crack growth suppression member has a crack growth suppression portion having a convex shape in the in-plane direction from the first member side to the second member side, and the adhesive strength of the interface with the adhesive layer is the same as that of the adhesive layer. An adhesive member, wherein the adhesive strength is weaker than the adhesive strength of the interface between the first member and the second member. 2. The adhesive member according to claim 1, wherein the progress suppressing portion is a curved portion presenting the convex shape. 3. The adhesive member according to claim 1, wherein the crack growth suppressing member further has a guiding portion extending along the in-plane direction from an end portion of the crack growth suppressing portion. The bonding member according to any one of claims 1 to 3, wherein a plurality of crack growth suppression members are arranged along the in-plane direction. 5. The adhesive member according to claim 4, wherein at least some of the adjacent crack growth suppression members are arranged such that the convex shapes of the crack growth suppression portions face opposite directions to each other. The bonding member according to any one of claims 1 to 4, wherein the crack growth suppressing member is formed such that the crack growth suppressing portion is continuously formed in an annular shape. 5. The adhesive member according to claim 4, wherein a plurality of said crack growth suppressing members are connected via a connecting portion. a first member preparing step of preparing a first member;
a second member preparation step of preparing a second member;
a bonding step of bonding the first member and the second member with an adhesive layer containing an adhesive;
with
A crack growth suppression member is arranged in the adhesive layer to suppress the propagation of a crack in the in-plane direction in the adhesive layer,
The crack growth suppression member has a crack growth suppression portion having a convex shape in the in-plane direction from the first member side to the second member side, and the adhesive strength of the interface with the adhesive layer is the same as that of the adhesive layer. A method of forming an adhesive member, wherein the adhesion strength of the interface between the first member and the second member is weaker than that of the interface. A method for forming an adhesive layer for forming an adhesive layer containing an adhesive for bonding a first member and a second member, comprising:
The base material is cut along a plurality of cut lines and folded along a plurality of folding lines, and a crack growth suppressing member that suppresses the propagation of cracks in the in-plane direction in the adhesive layer is applied via the connecting portion. forming the crack growth suppression member by impregnating the resin containing the adhesive to form the adhesive layer,
The crack growth suppression member has a crack growth suppression portion having a convex shape in the in-plane direction from the first member side to the second member side, and the adhesive strength of the interface with the adhesive layer is the same as that of the adhesive layer. A method of forming an adhesive layer, wherein the adhesion strength of the interface between the first member and the second member is weaker than that of the interface. A method for forming an adhesive layer for forming an adhesive layer containing an adhesive for bonding a first member and a second member, comprising:
forming the adhesive layer by adhering a plurality of film-like members containing the adhesive around the crack growth suppression member that suppresses the propagation of cracks in the in-plane direction in the adhesive layer;
The crack growth suppression member has a crack growth suppression portion having a convex shape in the in-plane direction from the first member side to the second member side, and the adhesive strength of the interface with the adhesive layer is the same as that of the adhesive layer. A method of forming an adhesive layer, wherein the adhesive strength is weaker than the adhesive strength of the interface between the first member and the second member.

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