Assembly comprising at least one composite part and attachment means

Abstract

The invention relates to an assembly (1) comprising, at least, a first composite part (2) consisting of a lay-up (4) of unidirectional layers of fibres (41, 42, 43, 44, 45) in a thermoplastic or thermosetting matrix, the part (2) being intended to be secured, via an attachment region (21), to a second part (3), wherein a bearing edge (22) of the part (2) comes into contact with a bearing edge (32) of the second part (3) which creates a contact surface, the assembly (1) comprising means (5) for attaching the first part to the second part. In the attachment region, the first part is formed of a lay-up (4) which consists of overlaid unidirectional layers (41, 42, 43, 44, 45) with different angles of orientation of the fibres between two adjacent layers. In the attachment region, at least one cavity (6) is formed in the first part, parallel to the contact surface and in a direction perpendicular to the direction of the unidirectional layers (41, 42, 43, 44, 45), and at least one bore (7) perpendicular to the contact surface, the bore (7) starting from the bearing edge (22) thereof and leading into the cavity (6), and being intended to receive a threaded element (51) while the cavity and the second part (3) support the clamping elements (52, 53). The bore (7) can also be made along an axis inclined with respect to the contact surface.

Description

Description Title of the invention: Assembly comprising at least one composite part and fastening means

[0001] (The present invention relates to the field of composite materials and, more particularly, to a composite part manufactured by means of a specific draping, the latter being adapted for association with a means of fixing said composite part to any second part.

[0002] The attachment of composite parts to another part, whether also made of composite or of a non-composite material, is an important parameter in the design and manufacture of said composite parts.

[0003] In particular, mechanical fixings, such as clamps or screws, between a composite part and a second part, generate local overstresses, so that these fixings represent the weak point of composite structures and can lead to cracking of the composite and premature failures.

[0004] In particular, in conventional fasteners, the eccentricity of the fastener relative to the neutral axis of the part causes bending. This stress poses a particular challenge in the field of composites, as it creates a weak zone in the area of ​​change of direction, especially in T- or L-shaped fittings. This drawback is further exacerbated by the fact that variations in the direction of shells are difficult to achieve and therefore costly.

[0005] In particular, we know, in the state of the art, the French patent application FR 2 3 88 670 which describes an assembly intended to reinforce structural joints, comprising a reinforcing piece with a number of bores to connect this piece to other elements.

[0006] Thus, this reinforcing piece has a first hole drilled through it, the axis of which is parallel to a top edge of the piece. Several transverse holes, communicating with the single longitudinal hole, open into the outer edge of the piece's base. This piece can secure two structural elements by means of a cylindrical stud, inserted into the single longitudinal hole, and screws passing through holes drilled opposite the holes. Transverse elements communicating with the single longitudinal hole. The screws are connected to the stud to fasten the elements together.

[0007] Thus, in this composite part, the main drilling is done parallel to the direction of the composite layers.

[0008] As a consequence of this drilling parallel to the direction of the composite layers, the forces due to the fasteners tend to separate the composite layers which are held only by the resin, in tension.

[0009] The bond proposed in this document is, therefore, of low resistance capacity, and no proposal is made to give the fiber reinforcement resistance in the area of ​​the longitudinal drilling.

[0010] Furthermore, considering the configuration as described in the aforementioned document, it would be impossible to carry out a longitudinal drilling along a large wall, or in a non-straight wall.

[0011] The present invention aims to remedy, at least in part, the disadvantages of existing mechanical fastening methods in the field of composite parts, by proposing the realization of a fastening method allowing a transmission of significant mechanical actions in the main direction of the composite walls, and also allowing resistance of the fiber to separation at the drilling point.

[0012] To this end, the invention relates to an assembly comprising, at least, a first composite part made up of a drape of unidirectional fiber sheets in a thermoplastic or thermosetting matrix, said first composite part being intended to be joined, at the level of a fixing zone which it comprises, to a second part, composite or not, a bearing edge of said first composite part coming into contact with a bearing edge of said second part, thus creating a contact surface, said assembly further comprising means for fixing said first composite part to said second part.

[0013] The said assembly is particular in that, at least at the level of the said fixing zone, the said first composite part is composed of a drape consisting of a superposition of unidirectional plies with different fiber orientation angles between two adjacent plies, and in that, In a first embodiment, at the level of said fixing zone, at least one cavity is provided in said first composite piece, parallel to said contact surface and in a direction perpendicular to the direction of the unidirectional plies, and at least one drilling in an axis perpendicular to said contact surface, said drilling starting from the bearing edge of said first composite piece and opening into said cavity, said drilling being intended to receive a threaded element while said cavity and the second piece serve as a support for clamping elements.

[0014] Thus, through the invention, applying stress along the fiber axis of the composite part makes it possible to solve the problems encountered in existing assemblies in the prior art.

[0015] In a second embodiment of the assembly of the invention, at least one cavity is provided in said first composite part, parallel to said contact surface created between said first composite part and said second composite part, and in a direction perpendicular to the direction of the unidirectional plies while the drilling is carried out along an axis inclined with respect to this contact surface.

[0016] According to particular embodiments of the assembly of the invention, whether it be the first or second embodiment as described above:

[0017] - the cavity of the said first composite piece consists of a light;

[0018] - said first composite part includes an extra thickness of unidirectional fiber sheets at least in the fixing area;

[0019] - said cavity formed in said first composite part is cylindrical in shape and the clamping element coming into said cavity consists of a threaded cylinder of dimensions adapted to those of said cavity;

[0020] - the draping of unidirectional fiber layers of said first composite part consists of a stack, repeated n times, composed of a first layer, whose fibers are oriented at 90° with the principal axis of said first part, said first layer being surmounted by a sandwich consisting of a central layer whose fibers are oriented at 0° with the principal axis of the first part between two intermediate layers whose fibers are oriented at + or - 45° with the fibers of said first central layer and with the fibers of the first layer.

[0021] The invention also relates to a method of manufacturing a first composite part, consisting of a draping of sheets of unidirectional fibers in a thermoplastic or thermosetting matrix, and of joining, by means of the assembly according to the present invention, said first composite part to a second part, composite or not, at the level of a fixing area which comprises said first composite part, a bearing edge of said first composite part coming into contact with a bearing edge of said second part, thus creating a contact surface.

[0022] More specifically, the said process is characterized in that it comprises, at least, the following steps, taken in order:

[0023] - The draping of said first piece is formed by superimposing n layers of unidirectional fibers, the fibers of two adjacent layers having different orientation angles, and the polymerization of the matrix is ​​carried out;

[0024] - At least one cavity is provided at the level of a fixing zone which comprises said first composite part, said cavity being parallel to said contact surface and in a direction perpendicular to the direction of the unidirectional plies;

[0025] - At least one drilling is carried out along an axis perpendicular to said contact surface, starting from the bearing edge of said first composite part and opening into said cavity;

[0026] - The said bearing edge of the said first composite piece is brought into contact with the said bearing edge of the said second piece, and a threaded element is inserted into the said bore and clamping elements are inserted into the said cavity and at the level of the said second piece to proceed with the joining of the said two pieces.

[0027] When the process aims to manufacture the assembly according to the second embodiment of the invention, as described above, the steps are similar, except that the drilling is carried out along an axis inclined relative to said contact surface between the first composite part and the second part, composite or not.

[0028] Other objects and advantages of the present invention will become apparent during the following description relating to embodiments which are given only as indicative and non-limiting examples.

[0029] Understanding this description will be facilitated by referring to the attached drawings, in which:

[0030] [Fig.1] represents a schematic and perspective view of a particular embodiment of an assembly according to the invention, comprising, on the left of the figure, a first composite part intended to be joined, through a fixing zone and via fixing means, to a second part, composite or not, visible on the right of the figure.

[0031] [Fig.2] represents a schematic and cross-sectional view of the first composite piece illustrating the succession of unidirectional fiber layers forming a drape in which perforations are made, also shown.

[0032] [Fig.3] represents a schematic view of three non-limiting examples of composite parts that can be joined to another part, composite or not, through the assembly according to the invention, namely, from left to right, a fitting, a tube, or a turbo machine blade.

[0033] [Fig. 4] represents a schematic and exploded view of an example of an embodiment of an assembly according to the present invention, in which the first composite part consists of a first type of fitting.

[0034] [Fig. 5] represents a schematic and perspective view of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the latter consists of a second type of fitting.

[0035] [Fig. 6] represents two different schematic and perspective views of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the latter consists of a third type of fitting, called a multipoint fitting.

[0036] [Fig. 7] represents two similar schematic and perspective views, one of the two views being an enlargement of a part of the second view, of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the latter consists of an I-beam.

[0037] [Fig. 8] represents two schematic views, one in section and perspective and the second in section and in full, of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the latter consists of a first type of tube having a constant diameter over its entire length.

[0038] [Fig. 9] represents two schematic views, one in section and perspective and the second in section and in full, of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the latter consists of a second type of tube having a larger diameter at the level of the area of ​​attachment of said first composite part to a second part, composite or not, which is not illustrated in the figure.

[0039] [Fig. 10] represents a partial schematic view of another example of the realization of part of an assembly according to the present invention, namely the first composite part, which has a flat surface perpendicular to the drilling.

[0040] [Fig. 11] represents a partial schematic view of another example of the realization of part of an assembly according to the present invention, namely the first composite part, in which the cavity is made parallel to a contact surface between said first part and a second part (not shown), while the drilling is carried out along an axis inclined with respect to this contact surface.

[0041] With reference to the figures in the attached drawings, the present invention relates, more particularly, to an assembly 1 comprising, on the one hand, a first composite part 2 intended to be secured, at the level of a fixing zone 21 which it comprises, to a second part 3.

[0042] This second part 3 can also be a composite part. However, it can also be a non-composite part.

[0043] The said second part 3, composite or not, may be considered as forming part of the assembly 1 according to the invention, or as not forming part of said assembly 1.

[0044] The said first composite part 2 is, in a conventional manner, made up of a succession of layers of unidirectional fibers 41, 42, 43, 44, 45 in a thermoplastic or thermosetting matrix.

[0045] The said layers 41, 42, 43, 44, 45 are superimposed one on top of the other so as to form a drape 4, which is more particularly illustrated, in a very schematic way, in figure 2 of the attached drawings.

[0046] According to a particular feature of the invention, at least at the level of the fixing zone 21 of said first composite part 2, the draping 4 consists of a superposition of layers of unidirectional fibers 41, 42, 43, 44, 45 having different orientation angles of said fibers between two adjacent layers.

[0047] Thus, for example, two adjacent layers may advantageously have unidirectional fibers with different orientation angles of + or - 45°, at least at the level of the attachment zone 21 of said first composite part 2 and, preferably, over the whole of said part 2.

[0048] Obviously, when the second part 3 to which the first composite part 2 is to be attached is also a part made of composite material, the latter can be manufactured in the same way as the said first composite part 2. It can also be obtained by any other means known to a person skilled in the art for manufacturing composite parts.

[0049] To return to the joining between said first composite part 2 and the second part 3, composite or not, this is carried out, on the one hand, through the contact of a bearing edge 22 which includes said first composite part 2, at the level of the fixing area 21, with a bearing edge 32 which includes the second composite part 3 which allows the creation of a contact surface between these two parts 2, 3 and, on the other hand, by means of fixing means 5.

[0050] The contact surface between the two parts can be flat or curved (as shown for example in figure 3 of the attached drawings, illustrating a blade fixed on a tube).

[0051] According to another feature of the assembly 1 of the invention, at the level of the fixing area 21 of the first composite part 2, at least one cavity 6 is formed in said first composite part 2, with an orientation parallel to said contact surface between said first part 2 and the second part 3. Said cavity 6 is thus perpendicular to the principal axis of said part 2. In other words, this means that said cavity 6 is arranged in a direction perpendicular to the principal direction of the draping 4 of the unidirectional plies 41, 42, 43, 44, 45.

[0052] The fact that the axis of the drilling of the cavity 6 is in the direction perpendicular to the plane of the draping 4 of layers of fibers 41, 42, 43, 44, 45 allows, in association with the arrangement of the unidirectional layers of fibers 41, 42, 43, 44, 45 an improvement in the mechanical strength of the drilling when it is stressed by the fixings which will be described later.

[0053] As a result, at the level of the drilling of cavity 6, the fiber retains optimal resistance to separation.

[0054] In addition to said cavity 6, at least one hole 7 is provided, along an axis perpendicular to said contact surface between the two parts 2, 3, said hole 7 starting more particularly from the bearing edge 22 of the fixing area 21 of part 2, and opening into the cavity 6.

[0055] Thus, unlike cavity 6, drilling 7 is carried out parallel to the direction of the composite layers 41, 42, 43, 44, 45. That being said, drilling 7 being smaller than cavity 6, and not being through, it does not negatively influence the resistance to separation of the fiber layers at the level of the fixing area.

[0056] The bore 7 is intended to receive a threaded element 51 which comprises the fastening means 5, while the cavity 6 and the second part 3 serve as a support for clamping elements 52, 53 which also make up the fastening means 5.

[0057] Cavity 6 is preferentially open so that it can consist of a light, according to the embodiment illustrated in the attached figures.

[0058] Note that, preferably, and as shown in particular in figures 1 and 3 to 9, the assembly 1 of the present invention more preferably comprises a plurality of cavities 6 and an equivalent number of holes 7, the quantity and arrangement of these holes being adapted according to the shapes and dimensions of said first composite part 2 to be joined to said second part 3.

[0059] Preferably, and as illustrated in the attached figures, said cavity 6, or said cavities as appropriate, provided in said first composite part 2, has a cylindrical shape.

[0060] Thus, the clamping element 52 intended to be positioned in said cavity 6 can consist of a threaded cylinder 52 of dimensions adapted so as to allow its insertion within said cavity 6, while the fixing means 5 are completed by a screw 51, 53. This particularly preferred embodiment is that which is illustrated in figure 1 of the attached drawings.

[0061] However, it is conceivable that said cavity 6, as well as the clamping element 52 intended to be integrated within said cavity 6, may have all shapes and dimensions.

[0062] With reference to figure 10 of the attached drawings, it is therefore conceivable that one of the edges of the cavity 6 has, at least partially, or even totally, a flat surface perpendicular to the bore 7. This advantageously allows the use of conventional screws and washers as clamping elements.

[0063] Such a design of an assembly 1 conforming to the present invention allows the recovery of considerable tensile force, the limit of resistance being the mechanical strength of the screws.

[0064] Of course, the shapes can be advantageously adapted to allow the threaded elements to be fixed by tightening on the side of the first composite part 2 (not shown), or on the side of the second part 3, composite or not, as shown in the figures.

[0065] In addition, intermediate support elements 54, visible in figures 4, 5, 6, of the half-moon washer type, may optionally complement the fastening means 5, in particular when the cavity 6 is concave in shape, the intermediate support element 54 then allowing clamping on a flat surface.

[0066] Note that the draping 4 of the layers 41, 42, 43, 44, 45 of said first composite part 2 can be optimized and, in particular, the stacking of layers 41, 42, 43, 44 which is illustrated in figure 2 proves to be particularly effective, especially in terms of resistance.

[0067] In particular, the draping 4 of layers 41, 42, 43, 44, 45 of unidirectional fibers of said first composite part 3 consists of a stacking of layers 41, 42, 43, 44, 45, composed as follows:

[0068] - a first layer 41 is laid down whose fibers are oriented at 90° with the main axis of said first piece 2,

[0069] - said first layer 41 is surmounted by a sandwich consisting of a central layer 43 whose fibers are oriented at 0° with the main axis of the first composite piece 2 between two intermediate layers 42, 44 whose fibers are oriented at + or - 45° with the fibers of said first central layer 43 and with the fibers of the first layer 41,

[0070] - we repeat this stacking n times, starting again with a layer 45 whose fibers are oriented at 90° with the main axis of said first piece 2, etc.

[0071] In a particularly advantageous way, said first composite part 2 has an extra thickness E of unidirectional fiber layers 41, 42, 43, 44, 45, at least in the area of ​​attachment 21 of this composite part 2 to a second part 3, composite or not.

[0072] With reference to Figure 11 of the accompanying drawings, this figure represents part of an assembly according to the invention, namely the first composite part 2, in a second embodiment of the invention, similar to the first, the cavity 6 again being formed parallel to the contact surface between the two parts 2, 3 to be assembled, and in a direction perpendicular to the plane of the drape 4 of the unidirectional sheets 41, 42, 43, 44, 45, whereas, unlike the first embodiment described above, the drilling 7 is provided along an axis which is inclined with respect to said contact surface created between said two parts 2, 3 to be assembled.

[0073] Thus the hole 7, on the representation on the left of figure 11, where the clamping element passes, can be inclined in the average plane of the surface of the composite part 2, for example to increase the shear transmission capacity of the link, or the transmission of a torsional torque for a shaft.

[0074] With regard to the right part of figure 11, the hole 7 can also be inclined in the plane perpendicular to the mean plane of the composite surface 2, to facilitate the installation of the clamping elements.

[0075] All the characteristics that have been described above, in connection with the first example of the assembly, in which the first composite part 2 has a hole 7 formed along an axis perpendicular to said contact surface between said first composite part 2 and a second part 3, are also applicable to this second example of the assembly in which the hole 7 is inclined with respect to this contact surface.

[0076] The present invention also relates to a method of manufacturing, on the one hand, a first composite part 2, consisting of a draping 4 of sheets of unidirectional fibers 41, 42, 43, 44, 45 in a thermoplastic or thermosetting matrix, and of joining, on the other hand, by means of the assembly 1 described above, said first composite part 2 to a second part 3, composite or not.

[0077] As already mentioned, the joining of the two parts 2, 3 is carried out at the level of a fixing area 21 which includes said first composite part 2, a bearing edge 22 of said first composite part 2 coming into contact with a bearing edge 32 of said second part 3, thus creating a contact surface between said first composite part 2, and the second part 3, the latter being able to be composite or not.

[0078] The manufacturing and bonding process according to the invention comprises, at least, the following steps, taken in order:

[0079] - We form the drape 4 of said first piece 2 by superimposing n layers of unidirectional fibers 41, 42, 43, 44, 45, the fibers of two layers adjacent having different fiber orientation angles, and a polymerization of the thermoplastic or thermosetting matrix is ​​carried out;

[0080] - it should be noted that, preferably, but optionally, during the formation of the drape 4, an extra thickness E of unidirectional fiber sheets is produced at least in the fixing zone 21 of the first composite part 2 which will intervene in the subsequent steps of securing it to the second part 3;

[0081] - At least one cavity 6 is provided at the level of said fixing zone 21 which comprises said first composite part 2, the latter preferentially having an excess thickness of fiber layers, said cavity 6 being made along an axis parallel to the contact surface between said first composite part 2 and the second part 3, composite or not, said cavity 6 being arranged along a direction perpendicular to the main direction of the draping 4 of the unidirectional layers 41, 42, 43, 44, 45;

[0082] - At least one drilling 7 is carried out along an axis perpendicular to the contact surface or, as the case may be, inclined with respect to this contact surface, starting from the bearing edge 22 of said first composite part 2 and opening into the cavity 6 which was drilled in the fixing area 21 in the previous step;

[0083] - The said bearing edge 22 of the said first composite part 2 is brought into contact with the said bearing edge 32 of the said second part 3, and a threaded element 51 is inserted into the said bore 7 and clamping elements 52, 53 into the said cavity 6 and at the level of the said second part 3 to proceed with the joining of the said first composite part 2 with the said second part 3.

[0084] The preferential elements and characteristics which have been described in connection with the assembly 1 of the invention can obviously be applied to the process of the invention, in particular with regard to the linking of the fiber layers for the formation of the drape 4, and with regard to the plurality of cavities 6 and drillings 7 which can be provided at the level of the fixing area 21 of the first composite part 2.

[0085] With reference now to figure 3 of the attached drawings, it should be noted that the fastening system according to the invention will be able to follow the geometric evolution of the wall of the composite part 2 to be fixed, so as to optimize the cohesion of the assembly between said composite part 2 and a second part 3, in particular during stresses which may be complex or in complex geometries, such as fittings 2a, tubes 2b, or turbomachine blades 2c.

[0086] Figures 4 and following illustrate various applications of the present invention for a connection of a first composite part 2 to a second part 3, whether composite or not.

[0087] Thus, in figures 4, 5, 6, the first composite part 2 consists of a fitting, in particular a multipoint fitting in figure 6.

[0088] In figure 7, the first composite part 2 consists of an I-beam.

[0089] In figures 8 and 9, the first composite part 2 consists of a tube

[0090] The tube in figure 8 has a constant diameter along its entire length, and, at its fixing zone 21, an increase in thickness is made to compensate for material shrinkage and to have the thickness required for the fixing means.

[0091] Figure 9 shows a tube with a larger diameter at the fixing area 21 of said first composite part 2 to a second composite part 3, so as to allow clearance to facilitate the placement of the fixing means and for axial access to these fixing means (not shown in the figure).

[0092] In this particular application, shown in Figure 9, it can be noted that the fixing axis is offset from the main axis of the composite part 2, which allows the shape of the composite part to be adapted to the fixing method for reinforcement at the fixing area.

[0093] More generally, the invention has applications in the manufacture of aeronautical fittings, transmission shafts, masts, beams, etc.

Claims

Claims

1. (Assembly (1) comprising, at least, a first composite part (2) consisting of a lay-up (4) of sheets of unidirectional fibers (41, 42, 43, 44, 45) in a thermoplastic or thermosetting matrix, said first composite part (2) being intended to be secured, at a fixing zone (21) which it comprises, to a second part (3), composite or not, a bearing edge (22) of said first composite part (2) coming into contact with a bearing edge (32) of said second part (3) creating a contact surface, said assembly (1) further comprising means (5) for fixing said first composite part (2) to said second part (2) and being characterized in that, at least at said fixing zone (22), said first composite part (2) is composed of a lay-up (4) consisting of a superposition of unidirectional sheets (41, 42, 43, 44,45) with different fiber orientation angles between two adjacent plies, and in that, at the level of said fixing zone (21), at least one cavity (6) is provided in said first composite part (3), parallel to said contact surface and in a direction perpendicular to the direction of the unidirectional plies (41, 42, 43, 44, 45), and at least one bore (7) along an axis perpendicular to said contact surface, said bore (7) starting from the bearing edge (22) of said first composite part (2) and opening into said cavity (6), said bore (7) being intended to receive a threaded element (51) while said cavity (6) and the second part (3) serve as support for clamping elements (52, 53).,

2. Assembly (1) according to claim 1 characterized in that the cavity (6) of said first composite part (2) consists of a light.

3. Assembly (1) according to claim 1 or claim 2 characterized in that said first composite part (2) comprises an excess thickness (E) of sheets of unidirectional fibers (41, 42, 43, 44, 45) at least in the fixing zone (21).

4. Assembly (1) according to any one of the preceding claims, characterized in that said cavity (6) provided in said first composite part (2) is cylindrical in shape and the clamping element (52) coming into said cavity (6) consists of a threaded cylinder (52) of dimensions adapted to those of said cavity (6).

5. Assembly (1) according to any one of the preceding claims, characterized in that the draping (4) of sheets of unidirectional fibers of said first composite part (2) consists of a stack, repeated n times, composed of a first sheet (41), the fibers of which are oriented at 90° with the main axis of said first part (2), said first sheet (41) being surmounted by a sandwich consisting of a central sheet (43) the fibers of which are oriented at 0° with the main axis of the first part between two intermediate sheets (42, 44) the fibers of which are oriented at + or - 45° with the fibers of said first central sheet (43) and with the fibers of the first sheet (41).

6. Method of manufacturing a first composite part (2), consisting of a drape (4) of sheets of unidirectional fibers (41, 42, 43, 44, 45) in a thermoplastic or thermosetting matrix, and of securing, by means of the assembly (1) according to one of the preceding claims, said first composite part (2) to a second part (3), composite or not, at the level of a fixing zone (21) which comprises said first composite part (2), a bearing edge (22) of said first composite part (2) coming into contact with a bearing edge (32) of said second part (3) creating a contact surface, said method being characterized in that it comprises, at least, the following steps, taken in order: - The draping (4) of said first part (2) is formed by superimposing n sheets of unidirectional fibers (41, 42, 43, 44, 45), the fibers of two adjacent sheets having different orientation angles, and the matrix is ​​polymerized; - At least one cavity (6) is provided at the level of a fixing zone (21) which comprises said first composite part (2), said cavity (6) being parallel to said contact surface and in a direction perpendicular to the direction of the unidirectional layers (41, 42, 43, 44, 45); - At least one hole (7) is made along an axis perpendicular to said contact surface, starting from the bearing edge (22) of said first composite part and opening into said cavity (6); - Said bearing edge (22) of said first composite part (2) is brought into contact with said bearing edge (32) of said second part (3), and a threaded element (51) is inserted into said bore (7) and clamping elements (52, 53) into said cavity (6) and at the level of said second part (3) to secure said two parts (2, 3).

7. Assembly (1) comprising, at least, a first composite part (2) consisting of a lay-up (4) of sheets of unidirectional fibers (41, 42, 43, 44, 45) in a thermoplastic or thermosetting matrix, said first composite part (2) being intended to be secured, at a fixing zone (21) which it comprises, to a second part (3), composite or not, a bearing edge (22) of said first composite part (2) coming into contact with a bearing edge (32) of said second part (3) creating a contact surface, said assembly (1) further comprising means (5) for fixing said first composite part (2) to said second part (3) and being characterized in that, at least at said fixing zone (22), said first composite part (2) is composed of a lay-up (4) consisting of a superposition of unidirectional sheets (41, 42, 43, 44,45) with different fiber orientation angles between two adjacent plies, and in that, at the level of said fixing zone (21), at least one cavity (6) is provided in said first composite part (3), parallel to said contact surface and in a direction perpendicular to the direction of the unidirectional plies (41, 42, 43, 44, 45), and at least one bore (7) along an axis inclined relative to said contact surface, said bore (7) starting from the bearing edge (22) of said first composite part (2) and opening into said cavity (6), said bore (7) being intended to receive a threaded element (51) while said cavity (6) and the second part (3) serve as support for clamping elements (52, 53). |,

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