A composite material lower side door for an open vehicle, open vehicle

Abstract

The utility model discloses a kind of composite material's lower side door of open wagon, open wagon, lower side door includes: lower side door plate and folder assembly;Lower side door plate is fiber reinforced resin matrix composite material board, fiber reinforced resin matrix composite material board includes impregnated tape layer, impregnated tape layer includes first fiber and second fiber, first fiber and second fiber are transverse and longitudinal interlaced;Folder assembly is installed in lower side door plate, folder assembly is used to connect with vehicle body, and can be separable with lower side door plate fixed on vehicle body.The impregnated tape layer of the lower side door plate of the utility model is transverse and longitudinal interlaced with first fiber and second fiber, which can increase the strength of the fiber reinforced resin matrix composite material board, thereby reducing the deformation of the lower side door, preventing leakage of goods and ensuring normal transportation of the open wagon.

Description

Technical Field

[0001] This utility model relates to the technical field of railway transport vehicles, and in particular to a composite material lower side door of an open wagon and an open wagon. Background Technology

[0002] Open wagons are the main type of freight car on my country's railways, primarily used for transporting goods such as coal, timber, steel coils, and containers. Open wagons have an open body structure with four side panels, two of which have fold-down lower doors for easy loading and unloading.

[0003] Currently, the lower doors of open wagons are mainly made of carbon steel. These doors primarily consist of a profiled door panel and hinges. The profiled door panel is fixed to the wagon body via the hinges, achieving a seal. However, under the pressure of cargo, the lower door can suffer severe deformation and corrosion. After deformation, the gap between the lower door and the wagon body widens, leading to cargo leakage and affecting the normal transport of open wagons. Utility Model Content

[0004] In view of this, the present invention provides a lower side door of a convertible made of composite material and a processing method thereof, using fiber-reinforced resin-based composite material to improve the strength of the lower side door and reduce its deformation. Furthermore, the present invention also provides a convertible with a lower side door made of the aforementioned composite material.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lower side door of a convertible made of composite material, comprising: a lower side door panel and a hinge assembly;

[0007] The lower door panel is a fiber-reinforced resin-based composite material panel. The fiber-reinforced resin-based composite material panel includes an impregnation layer. The impregnation layer includes a first fiber and a second fiber. The first fiber and the second fiber are interwoven in a fabric.

[0008] The hinge assembly is installed on the lower door panel. The hinge assembly is used to connect with the vehicle body and can detachably fix the lower door panel to the vehicle body.

[0009] Preferably, in the lower side door of the above-mentioned convertible made of composite material, the hinge assembly includes: a hinge body, a vertical plate, and a hanging ring;

[0010] The folding body is detachably connected to the lower door panel, and the dimension of the folding body in the extending direction is greater than the dimension of the lower door panel in the extending direction of the folding body; and one end of the folding body is hinged to the vehicle body.

[0011] The upright plate is located in the middle of the folding body and is arranged along the extension direction of the folding body. A hanging ring is provided at the end of the upright plate that is away from the folding body and hinged to the vehicle body.

[0012] Preferably, in the lower side door of the above-mentioned convertible made of composite material, both the hinge body and the upright plate are made of metal, and the hinge body and the upright plate are welded together;

[0013] Alternatively, both the folding body and the upright plate are fiber-reinforced resin-based composite materials, and the folding body and the upright plate are integrally formed.

[0014] Preferably, the lower side door of the above-mentioned convertible made of composite material further includes: a door panel reinforcing plate; the door panel reinforcing plate is disposed in the middle position of the lower side door panel, and the door panel reinforcing plate is detachably connected to the lower side door panel.

[0015] Preferably, the lower side door of the above-mentioned convertible made of composite material further includes: a supporting back beam;

[0016] The supporting back beam is arranged along the edge of the lower door panel, and the supporting back beam is detachably connected to the lower door panel. The cross-section of the supporting back beam is a polygonal hollow structure.

[0017] Preferably, in the lower side door of the above-mentioned convertible made of composite material, the supporting back beam is a ring-shaped structural component obtained by pultrusion molding process of fiber reinforced resin matrix composite material.

[0018] Preferably, in the lower side door of the above-mentioned convertible made of composite material, the supporting back beam is a ring-shaped structural component obtained by pultrusion molding process of fiber reinforced resin matrix composite material.

[0019] Preferably, in the lower side door of the above-mentioned convertible composite material, the fiber-reinforced resin matrix composite panel further includes a thermoplastic resin matrix, which is impregnated in a fabric of the first fiber and the second fiber.

[0020] Furthermore, the mass ratio of the thermoplastic resin matrix to the fabric is not less than 3:2.

[0021] Preferably, in the lower side door of the above-mentioned convertible made of composite material, the first fiber is glass fiber, carbon fiber or aramid fiber; and the second fiber is glass fiber, carbon fiber or aramid fiber.

[0022] The thermoplastic resin matrix is ​​PP, PE or PA.

[0023] Preferably, in the lower side door of the above-mentioned convertible composite material, a plurality of the impregnation strips are stacked, and the layup angle of adjacent impregnation strips is 0°, -45°, 90° or 45°.

[0024] A convertible includes a lower side door, wherein the lower side door is a composite material lower side door of the convertible as described in any of the preceding claims.

[0025] This utility model discloses a composite material lower door for an open wagon, including a lower door panel and a hinge assembly. The lower door panel can be detachably installed from the wagon body via the hinge assembly. The lower door panel is a fiber-reinforced resin-based composite material panel, which includes an impregnation layer. The impregnation layer uses a cross-woven first and second fiber structure, which increases the strength of the fiber-reinforced resin-based composite material panel, thereby reducing the deformation of the lower door, preventing cargo leakage, and ensuring the normal transportation of the open wagon.

[0026] Furthermore, this utility model embodiment also discloses a processing method for the lower side door of an open wagon, wherein the impregnation layer of the fiber-reinforced resin matrix composite board adopts a cross-and-cross interlacing of the first fiber and the second fiber, which can increase the strength of the fiber-reinforced resin matrix composite board, thereby reducing the deformation of the lower side door using the fiber-reinforced resin matrix composite board, preventing cargo leakage, and ensuring the normal transportation of the open wagon. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view of the lower side door of the convertible disclosed in an embodiment of the present utility model;

[0029] Figure 2 This is a side view of the lower door of a convertible disclosed in an embodiment of the present utility model;

[0030] Figure 3 This is a front view of the lower door panel of the lower door disclosed in an embodiment of the present utility model;

[0031] Figure 4 This is a front view of the hinge assembly of the lower door disclosed in this embodiment of the utility model;

[0032] Figure 5 This is a side view of the hinge of the lower door hinge assembly disclosed in an embodiment of the present utility model;

[0033] Figure 6 This is a cross-sectional view of the support beam of the lower door disclosed in an embodiment of this utility model. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0036] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0037] Open wagons are the main type of freight car on my country's railways, primarily used for transporting goods such as coal, timber, steel coils, and containers. Open wagons have an open body structure with four side panels, two of which have fold-down lower doors for easy loading and unloading.

[0038] Currently, the lower doors of open wagons are mainly made of carbon steel. These doors primarily consist of a profiled door panel and hinges. The profiled door panel is fixed to the wagon body via the hinges, achieving a seal. However, under the pressure of cargo, the lower door can suffer severe deformation and corrosion. After deformation, the gap between the lower door and the wagon body widens, leading to cargo leakage and affecting the normal transport of open wagons.

[0039] Based on the above-mentioned technical problems, this utility model embodiment discloses a lower side door of an open wagon, wherein the lower side door panel is made of fiber-reinforced resin matrix composite material, which ensures that the lower side door panel increases its rigidity while reducing its own weight, thereby reducing the deformation of the lower side door, preventing cargo leakage, and ensuring the normal transportation of the open wagon.

[0040] like Figure 1 and Figure 2As shown, the lower side door of the convertible, made of composite materials, includes a lower side door assembly 100 and a hinge assembly 200. The lower side door assembly 100 includes a lower side door panel 101, a door panel reinforcing plate 102, and a support back beam 103. The hinge assembly 200 includes a hinge 201 and a hanging ring 202.

[0041] The lower door panel 101 is the main structure of the lower door. The lower door panel 101 can face the door opening of the vehicle body and cover and close the door opening of the vehicle body. After the lower door panel 101 is separated from the door opening of the vehicle body, the door opening of the vehicle body can be opened to facilitate the loading and unloading of goods into the open wagon.

[0042] One end of the hinge assembly 200 can be hinged to the vehicle body, and the other end of the hinge assembly 200 can be detachably and fixedly connected to the vehicle body. The hinge assembly 200 is fixedly connected to the lower door panel 101.

[0043] The hinge assembly 200 rotates away from the vehicle body relative to its hinge point, allowing the lower door panel 101 to open the doorway of the vehicle body; the hinge assembly 200 rotates towards the vehicle body relative to its hinge point until the lower door panel 101 is flush with the vehicle body, thus closing the doorway on the vehicle body. In some embodiments, to ensure the stability of the lower door panel 101's flush with the vehicle body, the lower door panel 101 is connected to the vehicle body via the hinge assembly 200, thereby achieving a fixed connection between the lower door panel 101 and the vehicle body.

[0044] Optionally, the hinge 201 of the hinge assembly 200 is fixedly connected to the lower door panel 101. One end of the hinge 201 is hinged to the vehicle body, and the other end is provided with a hanging ring 202. The hanging ring 202 can be detachably and fixedly connected to the hook of the vehicle body, thereby realizing the connection between the lower door panel 101 and the vehicle body through the hinge assembly 200.

[0045] In order to enable the lower door panel 101 to be connected to the vehicle body via the hinge assembly 200, the dimension of the hinge 201 along the extension direction in this embodiment of the utility model is larger than the dimension of the lower door panel 101 along the extension direction of the hinge 201, and the two ends of the hinge 201 along the extension direction respectively extend beyond the ends of the lower door panel 101 on the corresponding sides along the extension direction of the hinge 201.

[0046] Combination Figure 2 As shown, the lower door panel 101 of this utility model embodiment is a fiber-reinforced resin-based composite material board. The fiber-reinforced resin-based composite material board includes an impregnation layer, which includes a first fiber 1011 and a second fiber 1012. The first fiber 1011 and the second fiber 1012 are interwoven horizontally and vertically.

[0047] The fiber-reinforced resin-based composite material plate of this utility model includes an impregnation layer. The impregnation layer is made of first fiber 1011 and second fiber 1012 interwoven horizontally and vertically, which can increase the strength of the fiber-reinforced resin-based composite material plate, thereby reducing the deformation of the lower door, preventing cargo leakage, and ensuring the normal transportation of open wagons.

[0048] Optionally, the first fiber 1011 and the second fiber 1012 are arranged perpendicularly, or the angle between the first fiber 1011 and the second fiber 1012 is less than 90° and greater than 30°.

[0049] In some embodiments, the fiber-reinforced resin-based composite board comprises multiple layers of impregnated tape stacked along the thickness direction, eliminating the need for complex molds. This facilitates rapid, continuous production of the lower door panel 101, ensuring low manufacturing costs. Furthermore, the lower door panel 101 employs a laminated composite board structure, meaning it is a solid structure. This ensures consistent strength throughout the lower door panel 101 and reduces the likelihood of surface damage. In contrast, sandwich-structured lower door panels 101 are prone to surface damage and are difficult to repair after breakage.

[0050] In this embodiment of the invention, the door panel reinforcing plate 102 is disposed in the middle of the lower door panel 101, and the door panel reinforcing plate 102 is detachably connected to the lower door panel 101. Optionally, the door panel reinforcing plate 102 and the lower door panel 101 can be connected or snapped together by threaded connectors.

[0051] The door panel reinforcement plate 102 is provided in a certain area in the middle of the side of the lower door panel 101 near the material storage space of the vehicle body (i.e., the inner side of the vehicle body). It can increase the structural rigidity of the central area of ​​the lower door panel 101 and further reduce the possibility of deformation of the lower door panel 101.

[0052] In this embodiment of the invention, the support back beam 103 is arranged along the edge of the lower door panel 101, and the support back beam 103 is detachably connected to the lower door panel 101. Optionally, the support back beam 103 and the lower door panel 101 can be connected or snapped together by threaded fasteners.

[0053] The support beam 103 is provided in the edge area of ​​the lower door panel 101 near the material storage space of the vehicle body (i.e., the inner side of the vehicle body), which can increase the structural rigidity of the edge area of ​​the lower door panel 101 and further reduce the possibility of deformation of the lower door panel 101.

[0054] Optionally, the support back beam 103 is a ring-shaped structure with the same outer contour shape as the lower door panel 101. For example, if the lower door panel 101 is a rectangular door panel, then the support back beam 103 is a rectangular ring structure. In some embodiments, the support back beam 103 can be set within a preset distance from the outer contour line of the lower door panel 101. The distance from the support back beam 103 to the outer contour line of the lower door panel 101 can be set according to different needs, and all are within the protection range.

[0055] like Figure 6 As shown, the cross-section of the support beam 103 in this embodiment of the present invention is a polygonal hollow structure. For example, the cross-section of the support beam 103 is a triangular hollow structure.

[0056] The cross-section of the support back beam 103 adopts a triangular structure, which can increase the strength of the support back beam 103. The support back beam 103 adopts a hollow structure, which can reduce the weight of the support back beam 103 and help to achieve the lightweight requirements of the lower door.

[0057] The cross-section of the support beam 103 in this embodiment of the present invention can also be rectangular or hexagonal, and both are within the scope of protection.

[0058] In some embodiments, the supporting back beam 103 is a ring-shaped structural component obtained by pultrusion molding of fiber-reinforced resin matrix composite material. Optionally, the fiber-reinforced resin matrix composite material and... Figure 2 The fiber-reinforced resin matrix composite material of the lower middle door panel 101 is the same, or the fibers of the fiber-reinforced resin matrix composite material are unidirectionally arranged fibers.

[0059] The support back beam 103 is manufactured using a pultrusion molding process, which can improve the processing efficiency of the support back beam 103.

[0060] It should be noted that in some embodiments, the hinge assembly 200, the support back beam 103, and the door panel reinforcement plate 102 are connected to the lower door panel 101 by threaded connectors, which can be bolts.

[0061] The hinge assembly 200, the support back beam 103, and the door panel reinforcement plate 102 are detachably connected to the lower door panel 101, making the hinge assembly 200, the support back beam 103, the door panel reinforcement plate 102, and the lower door panel 101 individual components. This allows for the individual replacement of the hinge assembly 200, the support back beam 103, the door panel reinforcement plate 102, and the lower door panel 101, which helps reduce the cost of using the composite material lower door of this utility model embodiment.

[0062] like Figure 4 and Figure 5 As shown, the fold 201 includes a fold body 2011 and a stand 2012.

[0063] The folding body 2011 and the lower door panel 101 can be detachably connected by threaded connectors to facilitate the separation of the folding body 2011 and the lower door panel 101.

[0064] The dimension of the folding body 2011 in the extension direction is larger than the dimension of the lower door panel 101 in the extension direction of the folding body 2011; and one end of the folding body 2011 is hinged to the vehicle body; the upright plate 2012 is located in the middle of the folding body 2011 and is arranged along the extension direction of the folding body 2011, and a hanging ring 202 is provided at the end of the upright plate 2012 away from the folding body 2011 that is hinged to the vehicle body.

[0065] In this embodiment of the utility model, the folding body 2011 and the upright plate 2012 are arranged in a T-shape. The upright plate 2012 can increase the strength of the folding body 201, thereby increasing the strength of the lower door panel assembly 100 connected to the folding assembly 200.

[0066] The hinge body 2011 and the upright plate 2012 are located on the outer side of the lower door panel 101 (i.e., the side of the vehicle body away from the inner side). Optionally, if both the hinge body 2011 and the upright plate 2012 are made of steel, they can be connected by welding; if both the hinge body 2011 and the upright plate 2012 are made of fiber-reinforced resin matrix composite material, they can be integrally formed.

[0067] It should be noted that the fiber-reinforced resin matrix composite material of the folding body 2011 and the upright plate 2012 can be used with... Figure 2 The fiber-reinforced resin matrix composite material of the lower middle door panel 101 is the same, or the fibers of the fiber-reinforced resin matrix composite material are unidirectionally arranged fibers.

[0068] The shape and size of the upright plate 2012 can be set according to different needs, and all are within the protection range. The end of the upright plate 2012 that is away from the hinge body 2011 and is hinged to the vehicle body has a mounting hole 2013, which is used to set the hanging ring 202. The shape and size of the hanging ring 202 are not specifically limited here.

[0069] In addition, this utility model embodiment also discloses a method for processing a composite material lower side door of a convertible, which is applied to the lower side door of the above embodiment.

[0070] A method for processing a composite material lower side door of a convertible includes:

[0071] S1: The first and second fibers are interwoven into a fabric, and a thermoplastic resin matrix is ​​impregnated into the fabric to obtain a single-layer prepreg tape.

[0072] The first and second fibers can be arranged perpendicularly, or the angle between the first and second fibers can be less than 90° and greater than 30°. It should be noted that the first and second fibers in this paper are each a set of fiber yarns.

[0073] The first fiber in this embodiment of the invention can be glass fiber, carbon fiber, or aramid fiber; the second fiber can be glass fiber, carbon fiber, or aramid fiber. It is understood that the first and second fibers can be the same material or different materials, and the specific materials of the first and second fibers can be set according to different needs, all of which are within the scope of protection.

[0074] The thermoplastic resin matrix of this utility model embodiment can be polypropylene (PP), polyethylene (PE), or nylon (PA).

[0075] During the mixing process of fabric and thermoplastic resin matrix, the mass ratio of thermoplastic resin matrix to fabric should not be less than 3:2.

[0076] It should be noted that the temperature, pressure, and humidity conditions during the mixing process of the fabric and the thermoplastic resin matrix can be found in the existing processing technology of resin-based composite materials, and will not be elaborated here.

[0077] S2: Multiple single-layer prepreg tapes are stacked along the thickness direction, and the stacked single-layer prepreg tapes are pressurized and heated to cure into fiber-reinforced resin matrix composite board.

[0078] Multi-layer prepreg tapes are stacked, laid flat, compacted, and then cured under continuous pressure and heat to form a fiber-reinforced resin-based composite material board.

[0079] Optionally, the layup angle of adjacent dip strip layers is 0°, -45°, 90° or 45°. The layup angle of adjacent dip strip layers in this embodiment of the present invention can be set according to different needs. The above only exemplifies a few angles, and other angles are also within the scope of protection.

[0080] Arranging adjacent impregnation layers at a certain angle can increase the strength of fiber-reinforced resin matrix composite panels.

[0081] In some embodiments, the number of single-layer prepreg tapes is not specifically limited, and optionally, the thickness of the resulting fiber-reinforced resin matrix composite board ranges from 6 mm to 10 mm.

[0082] S3: Cut and trim the fiber-reinforced resin-based composite material board to obtain the lower door panel.

[0083] The hinge assembly 200, door panel reinforcement plate 102 and support back beam 103 disclosed in the above embodiments are connected to the obtained lower door. After the assembly of each component is completed, in some embodiments, a high-strength wear-resistant and anti-corrosion coating can be sprayed on the inner side of the lower door panel to further improve the impact resistance of the lower door panel.

[0084] The impregnation layer of the fiber-reinforced resin-based composite material plate in this embodiment of the invention uses a cross-woven first fiber and second fiber, which can increase the strength of the fiber-reinforced resin-based composite material plate, thereby reducing the deformation of the lower door of the fiber-reinforced resin-based composite material plate, preventing cargo leakage, and ensuring the normal transportation of open wagons.

[0085] Furthermore, this utility model embodiment also discloses a convertible, including a lower side door, wherein the lower side door is the composite material lower side door of the convertible disclosed in the above embodiment. Therefore, the convertible with the composite material lower side door of the convertible also has all the above-mentioned technical effects, which will not be repeated here.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lower side door of a convertible made of composite material, characterized in that, include: Lower side door panel (101) and hinge assembly (200); The lower door panel (101) is a fiber-reinforced resin-based composite material panel. The fiber-reinforced resin-based composite material panel includes an impregnation layer. The impregnation layer includes a first fiber and a second fiber. The first fiber and the second fiber are interwoven in the transverse and longitudinal directions to form a fabric. The hinge assembly (200) is installed on the lower door panel (101). The hinge assembly (200) is used to connect with the vehicle body and can detachably fix the lower door panel (101) to the vehicle body.

2. The lower side door of the convertible made of composite material according to claim 1, characterized in that, The folding assembly (200) includes: a folding body (2011), a stand (2012), and a hanging ring (202); The folding body (2011) is detachably connected to the lower door panel (101). The dimension of the folding body (2011) in the extending direction is greater than the dimension of the lower door panel (101) in the extending direction of the folding body (2011). One end of the folding body (2011) is hinged to the vehicle body. The upright plate (2012) is located in the middle of the folding body (2011) and is arranged along the extension direction of the folding body (2011). A hanging ring (202) is provided at the end of the upright plate (2012) that is away from the folding body (2011) and hinged to the vehicle body.

3. The lower side door of the convertible made of composite material according to claim 2, characterized in that, Both the folding body (2011) and the upright plate (2012) are made of metal, and the folding body (2011) and the upright plate (2012) are welded together. Alternatively, both the folding body (2011) and the upright plate (2012) are fiber-reinforced resin-based composite materials, and the folding body (2011) and the upright plate (2012) are integrally formed.

4. The lower side door of the convertible made of composite material according to any one of claims 1 to 3, characterized in that, Also includes: Door panel reinforcement plate (102); the door panel reinforcement plate (102) is disposed in the middle position of the lower door panel (101), and the door panel reinforcement plate (102) is detachably connected to the lower door panel (101).

5. The lower side door of the convertible made of composite material according to any one of claims 1 to 3, characterized in that, Also includes: support back beam (103); The supporting back beam (103) is arranged along the edge of the lower door panel (101), and the supporting back beam (103) is detachably connected to the lower door panel (101). The cross-section of the supporting back beam (103) is a polygonal hollow structure.

6. The lower side door of the convertible made of composite material according to claim 5, characterized in that, The supporting back beam (103) is a ring structure obtained by pultrusion molding process of fiber reinforced resin matrix composite material.

7. The lower side door of the convertible made of composite material according to any one of claims 1 to 3, characterized in that, The fiber-reinforced resin matrix composite board further includes a thermoplastic resin matrix, which is impregnated in a fabric of the first fiber and the second fiber; Furthermore, the mass ratio of the thermoplastic resin matrix to the fabric is not less than 3:

2.

8. The lower side door of the convertible made of composite material according to claim 7, characterized in that, The first fiber is glass fiber, carbon fiber, or aramid fiber; the second fiber is glass fiber, carbon fiber, or aramid fiber. The thermoplastic resin matrix is ​​PP, PE or PA.

9. The lower side door of the convertible made of composite material according to claim 7, characterized in that, Multiple impregnation tape layers are stacked, and the layup angle of adjacent impregnation tape layers is 0°, -45°, 90° or 45°.

10. A convertible, comprising a lower side door, characterized in that, The lower side door is a composite material lower side door of a convertible as described in any one of claims 1 to 9.

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