A double-layer structure composite containment cartridge and a preparation method thereof

Abstract

The application provides a double-layer structure composite containment case and a preparation method thereof. The double-layer structure containment case is in a structure form of "carbon fiber composite material core layer + organic fiber containment layer", and the organic fiber containment layer fiber is integrally woven on the carbon fiber composite material core layer. The high-strength carbon fiber composite material is used as the containment case structure bearing layer, so that the ability of the containment case to maintain the structural integrity under impact load is effectively improved; the organic fiber containment layer uses warp yarn and weft yarn to continuously stagger and interlock, so that the interlayer failure risk of the containment case after being impacted is eliminated, and the containment ability of the case is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of structural and functional integrated composite materials, and relates to a double-layer structural composite containment case and a preparation method thereof. BACKGROUND

[0002] The containment case of a turbofan engine not only provides an access channel for external air, but also needs to contain high-speed and high-energy dangerous fragments when the high-speed rotating blades are impacted by external objects or break due to internal defects. Therefore, the containment case needs to have sufficient structural rigidity and broken blade containment capacity. Most of the traditional containment cases are made of full metal materials or semi-composite structures of aramid fiber wound metal inner rings. Compared with the traditional containment cases, resin-based composite materials have the characteristics of low density, high specific strength and high specific modulus. Under the driving of the increasing engine thrust-to-weight ratio and efficiency, it is an inevitable trend to prepare a composite containment case.

[0003] At present, the composite containment case is generally prepared by using carbon fiber composite materials. For example, US patent US8322971B2, European patent EP1674244 and European patent EP1674671 all use carbon fiber woven preforms to prepare a composite containment case by winding the preforms on a mandrel and then performing liquid resin molding. Compared with organic fibers, carbon fibers have the characteristics of high density, high modulus and low toughness. In order to achieve the same containment capacity, the weight of carbon fiber composite materials is greater than that of organic fiber composite materials, and the weight reduction effect is limited. It is found through tests that the containment case prepared by the preform winding process is prone to resin matrix rupture at the interlayer interface of the multi-layer preform, which leads to delamination failure. Meanwhile, the end of the outermost preform in the winding process is a free end, which is also prone to large-area tearing and debonding after being impacted, resulting in delamination of the case or even disintegration of the case, which has a high safety risk. SUMMARY

[0004] The purpose of the present application is to solve the technical defects of the weak interlayer interface of the preform winding in the prior art, and to provide a double-layer structural composite containment case and a preparation method thereof.

[0005] To solve the technical problem, the technical scheme of the present application is as follows:

[0006] On the one hand, a double-layer structural composite containment case is provided, which is composed of a carbon fiber composite material core layer and an organic fiber composite material containment layer, wherein,

[0007] The carbon fiber composite material core layer is prepared by laying and pasting unidirectional carbon fiber prepreg and using a hot press tank forming technology;

[0008] The organic fiber composite containment layer is integrally woven on the carbon fiber composite core layer by organic fiber fibers, and is prepared by RTM forming technology; the integral weaving rule of the organic fiber of the containment layer is as follows:

[0009] The organic fiber yarn of the containment layer is woven in the axial direction of the machine box as the warp and in the circumferential direction of the machine box as the weft, wherein the warp and weft of the organic fiber yarn are continuous yarns;

[0010] The total number of weft yarns of the organic fiber is P / b, wherein P is the width required along the axial direction of the containment layer, and b is the distance moved along the axial direction of the core layer;

[0011] The warp of the cross opening passed by the odd-numbered weft yarns is the same, the warp of the cross opening passed by the even-numbered weft yarns is the same, the warp of the cross opening passed by the odd-numbered weft yarns and the even-numbered weft yarns is different, an interactive interlocking structure is formed along the circumferential direction of the machine box, and the interface between the arranged layers of the warp is eliminated; after the continuous weft yarn passes through a layer of warp opening after one round of the machine box, the weft yarn is moved in the thickness direction and then continues to pass through the next layer of warp opening until the specified thickness H is reached, and the interface between the arranged layers of the warp is eliminated;

[0012] The warp and weft of the organic fiber yarn of the containment layer are continuous yarns, the weft is continuously woven, and the warp and weft become an integral woven fabric, eliminating the interface of pure resin bonding.

[0013] On the one hand, a preparation method of the double-layer structure composite containment machine box is provided as follows:

[0014] (1) preparing a carbon fiber composite core layer: carbon fiber prepreg is laid on a forming core mold, and a net size carbon fiber composite core layer is obtained after curing and demolding;

[0015] (2) preparing an organic fiber composite containment layer:

[0016] a) determining the number of layers N of the organic fiber warp according to the thickness H of the containment layer, arranging M columns of warp on the surface of the carbon fiber composite core layer along the circumferential direction of the machine box, starting from the upper end of the containment area, introducing the first weft yarn of the first column from the cross opening of the adjacent column of warp, the first weft yarn passes through the openings of the first layer of the i-th column and the i+1-th column of warp along the circumferential direction of the machine box in turn, and after passing through M columns of warp, the first weft yarn returns to the starting position of the first column, the weft yarn moves outward by a distance of H / N in the thickness direction, and then passes through the openings of the second layer of the i-th column and the i+1-th column of warp along the circumferential direction of the machine box to form the second weft yarn of the first column, after passing through M columns of warp, the second weft yarn returns to the starting position of the first column, and the winding of N weft yarns is completed in turn, and the interlocking of N layers of warp reaches the specified thickness H, and the weaving of the first column of weft yarn is completed, at this time, the weft yarn is located at the Nth position of the first column;

[0017] b) the weft yarns move axially along the core layer by a distance b, then pass through the openings of the i+1th and i+2th columns of warp yarns in the Nth layer to form the second column of the Nth layer of weft yarns, and after passing through the openings of the M columns of warp yarns, return to the starting position of the Nth layer of weft yarns in the second column, then move inwardly along the thickness direction by a distance H / N and continue to pass through the openings of the i+1th and i+2th columns of warp yarns in the N-1th layer to form the second column of the N-1th layer of weft yarns, and then complete the winding of the N layers of weft yarns to achieve the specified thickness H, and complete the weaving of the second column of weft yarns, at this time, the weft yarns are located at the first column of the second column, and the weft yarns move axially along the core layer by a distance b to start the weaving of the first column of the next column of weft yarns; wherein i is a positive integer, i≤M-1.

[0018] c) repeating steps a) and b) to complete the weaving of the P / b columns of weft yarns, and then achieving the required width P of the containment layer along the axial direction to obtain the overall woven organic fiber containment layer.

[0019] d) composite containment chamber molding: filling the resin in the organic fiber containment layer and heating to solidify to obtain a double-layer structure composite containment chamber.

[0020] The method for laying the carbon fiber composite core layer on the forming core mold is one or more of manual laying, self-conveying fiber laying and automatic tape laying.

[0021] The organic fiber yarns of the containment layer are woven in the axial direction of the chamber as the warp yarns and in the circumferential direction of the chamber as the weft yarns.

[0022] The warp yarns through which the odd-numbered column weft yarns pass in the organic fiber of the containment layer are the same, the warp yarns through which the even-numbered column weft yarns pass are the same, and the warp yarns through which the odd-numbered column weft yarns and the even-numbered column weft yarns pass are different, forming an alternating interlocking structure in the circumferential direction of the chamber to eliminate the interface between the arranged columns of warp yarns; after the continuous weft yarns pass through the openings of one layer of warp yarns in one round of the chamber, they move along the thickness direction and then continue to pass through the openings of the next layer of warp yarns until the specified thickness H is reached, thereby eliminating the interface between the arranged layers of warp yarns.

[0023] The organic fiber of the containment layer is one or more of aramid fiber, high molecular weight polyethylene fiber, poly-p-phenylene benzobisoxazole fiber, poly-p-phenylene imidazole fiber, poly-phenylene pyridine di-imidazole fiber and polyimide fiber.

[0024] The beneficial effects of the present application are:

[0025] The invention includes an inclusion area organic fiber, which uses continuous weft yarns to pass through warp yarn openings in sequence, the same warp yarns in the cross openings passed through by odd-numbered weft yarns, the same warp yarns in the cross openings passed through by even-numbered weft yarns, the warp yarns in the cross openings passed through by odd-numbered weft yarns being different from the warp yarns in the cross openings passed through by even-numbered weft yarns, and an interactive interlocking structure being formed along the ring direction of the creel. The continuous weft yarns pass through the designed warp yarn openings to achieve overall weaving and eliminate the interface between the warp yarn arrangement columns. After the continuous weft yarns pass through a layer of warp yarn openings and move along the thickness direction, the weft yarns continue to pass through the next layer of warp yarn openings until the specified thickness H is reached, the interface between the warp yarn arrangement layers is eliminated, the inclusion layer of the overall weaving structure is formed, the risk of interlayer failure of the inclusion creel after being impacted is effectively avoided, and the inclusion capacity of the creel is improved.

[0026] Compared with organic fibers, carbon fibers have large density, high modulus and low toughness. In order to achieve the same inclusion capacity, the thickness of carbon fiber composite material is larger than that of organic fiber composite material, which results in a larger weight of the creel. Therefore, the carbon fiber composite material and the organic fiber composite material are combined in the present invention, and further weight reduction can be achieved compared with the pure carbon fiber inclusion creel preparation technology.

[0027] Compared with the existing woven preform winding process, the overall weaving technology of the present invention does not need secondary winding, requires less production equipment, and has higher production efficiency.

[0028] The structural bearing function and the inclusion function are separated, the structural bearing capacity and the inclusion capacity are realized by carbon fiber composite material and organic fiber composite material respectively, the separated design and evaluation can be carried out according to the functional requirements, and the development cycle is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions implemented by the present invention, the following will briefly analyze the drawings used in the examples of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative labor. The sizes of the parts shown in the drawings are not drawn according to the actual proportional relationship.

[0030] Figure 1 It is a schematic diagram of a double-layer structure composite material inclusion creel.

[0031] Figure 2 It is a schematic diagram of the axial section of a double-layer structure composite material inclusion creel.

[0032] Figure 3 It is a schematic diagram of the ring arrangement of the organic fiber warp yarns along the creel in some embodiments.

[0033] Figure 4 It is a schematic diagram of the axial section of the organic fiber weaving structure at the L1 position along the ring direction of the creel.

[0034] Figure 5 Figure 2 is a schematic diagram of the axial section of the organic fiber woven structure along the circumferential L2 position of the casing;

[0035] Figure 6 Figure 4 is a schematic diagram of the casing structure of Comparative Example 1;

[0036] Figure 7 Figure 5 is a physical diagram of the casing damage of Example 1;

[0037] Figure 8 Figure 6 is a physical diagram of the casing damage of Comparative Example 1;

[0038] Figure 1 shows a double-layer structure composite casing, a carbon fiber composite core layer 1 in the inner layer of the casing, and an organic fiber containment layer 2 outside the carbon fiber composite core layer. The organic fiber containment layer has a width P along the axial direction of the casing, a thickness H, and a length L = πD, where D is the outer diameter of the carbon fiber composite core layer. i Figure 1 shows a double-layer structure composite casing, a carbon fiber composite core layer 1 in the inner layer of the casing, and an organic fiber containment layer 2 outside the carbon fiber composite core layer. The organic fiber containment layer has a width P along the axial direction of the casing, a thickness H, and a length L = πD, where D is the outer diameter of the carbon fiber composite core layer. i+1 Figure 1 shows a double-layer structure composite casing, a carbon fiber composite core layer 1 in the inner layer of the casing, and an organic fiber containment layer 2 outside the carbon fiber composite core layer. The organic fiber containment layer has a width P along the axial direction of the casing, a thickness H, and a length L = πD, where D is the outer diameter of the carbon fiber composite core layer. i+2 Figure 1 shows a double-layer structure composite casing, a carbon fiber composite core layer 1 in the inner layer of the casing, and an organic fiber containment layer 2 outside the carbon fiber composite core layer. The organic fiber containment layer has a width P along the axial direction of the casing, a thickness H, and a length L = πD, where D is the outer diameter of the carbon fiber composite core layer. DETAILED DESCRIPTION

[0039] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] The features of each aspect of the embodiments of the present application will be described in detail below. In the following detailed description, many specific details are proposed in order to have a comprehensive understanding of the present application. In each drawing and the following description, the known structures and technologies are not shown in order to avoid unnecessary obscuring of the present application.

[0041] Figure 1 Figure 1 shows a double-layer structure composite casing, a carbon fiber composite core layer 1 in the inner layer of the casing, and an organic fiber containment layer 2 outside the carbon fiber composite core layer. The organic fiber containment layer has a width P along the axial direction of the casing, a thickness H, and a length L = πD, where D is the outer diameter of the carbon fiber composite core layer. Figure 2The axial section view of the double-layer structure composite containment case is shown, wherein the carbon fiber composite core layer 1 is a double-flanging structure with front and rear flanges, and the organic fiber containment layer 2 is tightly attached to the surface of the carbon fiber composite core layer.

[0042] Figure 3 The schematic view of the N-layer M-column organic fiber warp yarns arranged along the ring direction of the case in some embodiments is shown. For a certain column of warp yarns as the ith column of warp yarns, the relative position relationship of the i+1th column of warp yarns is the next column along the ring direction counterclockwise. Similarly, the i+2th column of warp yarns is the next column along the ring direction counterclockwise relative to the i+1th column of warp yarns.

[0043] To better illustrate the interlocking structure of warp and weft yarns, Figure 4 and Figure 5 The axial section view of the organic fiber weaving structure along the ring direction L1, L2 position of the case is shown, wherein L1, L2 are Figure 1 The organic fiber containment layer along the outer length L of the carbon fiber composite core layer at any two positions, Figure 4 In particular, the first column of weft yarns 21 and the second column of weft yarns 22 are shown. Starting from the upper end of the containment area, the first column of weft yarns 21 is introduced through the opening of the first column of warp yarns 21. The first column of weft yarns 21 is sequentially introduced through the openings of the first layer of the ith column and the i+1th column of warp yarns along the ring direction of the case, and then returns to the starting position of the first column of weft yarns 21 after passing through M columns of warp yarns. The weft yarns move outward by a distance of H / N along the thickness H direction and continue to pass through the openings of the second layer of the ith column and the i+1th column of warp yarns along the ring direction of the case to form the second column of weft yarns 212. After passing through M columns of warp yarns, the weft yarns return to the starting position of the second column of weft yarns 212. After sequentially completing N turns of weft yarns, the N-layer warp yarns are interlocked to the specified thickness H, and the weaving of the first column of weft yarns 21 is completed. At this time, the weft yarns are located at the first column of the Nth turn 21N.

[0044] As Figure 5As shown in the figure, after the first column Nth loop weft yarn 21N is woven, the weft yarn moves axially along the core layer by a distance b, and then passes through the openings of the i+1th and i+2th columns of warp yarns in the Nth layer to form the second column Nth loop weft yarn 22N, and after passing through M columns of warp yarns, the weft yarn returns to the starting position of the second column Nth loop weft yarn, and then moves inward along the thickness direction by a distance H / N, and continues to pass through the openings of the i+1th and i+2th columns of warp yarns in the N-1th layer along the ring direction of the machine chamber to form the second column N-1th loop weft yarn, and after the Nth loop weft yarn is completed, the 15 layers of warp yarns are interlocked to reach the specified thickness H, and the weaving of the second column weft yarn is completed, at this time the weft yarn reaches the position of the first loop 221 in the second column, and the weaving of the first loop weft yarn 231 in the third column is started by moving axially along the core layer by a distance b, at this time the third column weft yarn passes through the openings of the i+1th and i+2th columns of warp yarns in the first layer in turn, which is consistent with the first column weft yarn 21, and after the weaving of the P / b column weft yarn is completed (b is the axial distance between adjacent column weft yarns), the axial width P of the containing layer is reached, and the overall woven organic fiber containing layer is obtained.

[0045] The organic fiber containing layer prepared in this way has the same warp yarns passing through the cross openings of the odd column weft yarns and the same warp yarns passing through the cross openings of the even column weft yarns.

[0046] Example 1

[0047] 32 layers of carbon fiber composite material prepreg were laid on the forming core mold in turn by manual laying, and the laying mode was [-45 / 0 / 45 / 90] 4s The carbon fiber composite material core layer was packaged by vacuum bag and placed in a hot press tank after vacuumizing, and then cured at high temperature and high pressure to obtain the carbon fiber composite material core layer.

[0048] The containing layer fiber is selected to be polyimide fiber, the thickness of the containing layer is designed to be 15 mm, the single layer thickness of the polyimide fiber warp yarn is 1 mm, the number of layers of the polyimide fiber warp yarn is determined to be 15 layers, and 15 layers of 100 column warp yarns are arranged on the surface of the carbon fiber composite material core layer along the machine chamber axis, from the upper end of the containing area, the adjacent warp yarns introduce the first loop weft yarn in the first column, the first loop weft yarn passes through the openings of the first and second columns of warp yarns in the first layer in turn along the ring direction of the machine chamber, and after passing through 100 columns of warp yarns, the first loop weft yarn returns to the starting position, the weft yarn moves outward along the thickness direction by a distance of 1 mm, and then passes through the openings of the first and second columns of warp yarns in the second layer along the ring direction of the machine chamber to form the second loop weft yarn in the first column, and after passing through 100 columns of warp yarns, the second loop weft yarn returns to the starting position, and after 15 loops of weft yarns are completed, the 15 layers of warp yarns are interlocked to reach the specified thickness of 15 mm, and the weaving of the first column weft yarn is completed, at this time the weft yarn is located at the 15th loop in the first column;

[0049] The weft yarn moves 0.2 mm along the axial direction of the core layer, and then passes through the openings of the warp yarns in the 2nd column and the 3rd column in the 15th layer to form the 15th layer of the 2nd column, and after passing through a total of 100 columns of warp yarns, it returns to the starting position of the 15th layer of the 2nd column. The weft yarn moves 1 mm in the thickness direction and continues to pass through the openings of the warp yarns in the 2nd column and the 3rd column in the 14th layer to form the 14th layer of the 2nd column. After completing the winding of 15 layers of weft yarns, the 15 layers of warp yarns are interlocked to reach the specified thickness of 15 mm, and the weaving of the 2nd column of weft yarns is completed. At this time, the weft yarn reaches the first layer of the first column, and the weaving of the third column of weft yarns begins at the first layer of the third column.

[0050] The weft yarn winding and weaving process is repeated, and after completing the weaving of 100 columns of weft yarns, the containment layer reaches the required width of 20 mm along the axial direction, and the overall woven polyimide fiber containment layer is obtained.

[0051] The overall woven polyimide fiber containment layer is filled with resin and heated to solidify, obtaining a double-layer structure composite containment casing.

[0052] Example 2

[0053] The carbon fiber composite core layer is prepared according to Example 1.

[0054] The containment layer fiber is selected to be aramid fiber, and the thickness of the containment layer is designed to be 15 mm. The thickness of the aramid fiber warp yarn is 0.5 mm, and the number of layers of polyimide fiber warp yarn is determined to be 30 layers. On the surface of the carbon fiber composite core layer, 30 layers of 100 columns of warp yarns are arranged along the axial direction of the casing. From the upper end of the containment area, the adjacent warp yarns introduce the first layer of the first column of weft yarns. The first layer of the first column of weft yarns passes through the openings of the first layer of the first column and the second layer of the second column in the casing in turn, and after passing through a total of 100 columns of warp yarns, it returns to the starting position of the first layer of the first column. The weft yarn moves 1 mm in the thickness direction and continues to pass through the openings of the first layer of the first column and the second layer of the second column in the casing in turn to form the first layer of the second column of weft yarns. After passing through a total of 100 columns of warp yarns, it returns to the starting position of the first layer of the second column. After completing the winding of 30 layers of weft yarns, the 15 layers of warp yarns are interlocked to reach the specified thickness of 15 mm, and the weaving of the first column of weft yarns is completed. At this time, the weft yarn is located at the 30th layer of the first column.

[0055] The weft yarn moves 0.2 mm along the axial direction of the core layer, and then passes through the openings of the 2nd and 3rd columns of warp yarns in the 30th layer to form the 30th layer of weft yarns in the 2nd column, and after passing through 100 columns of warp yarns, the weft yarns return to the starting position of the 30th layer of weft yarns in the 2nd column, and the weft yarns move 1 mm in the thickness direction and continue to pass through the openings of the 2nd and 3rd columns of warp yarns in the 29th layer to form the 14th layer of weft yarns in the 2nd column, and after completing the winding of 30 layers of weft yarns, the 30 layers of warp yarns are interlocked to reach the specified thickness of 15 mm, and the weaving of the weft yarns in the 2nd column is completed, at this time the weft yarns reach the first layer in the 2nd column, and the weaving of the weft yarns in the 3rd column is started by moving 0.2 mm along the axial direction of the core layer.

[0056] The weft yarn winding and weaving process is repeated, and after the weaving of 100 columns of weft yarns is completed, the required width of the containment layer along the axial direction is 20 mm, and the overall woven aramid fiber containment layer is obtained.

[0057] The aramid fiber overall woven containment layer is filled with resin and heated to solidify to obtain a double-layer structure composite containment casing.

[0058] Comparative Example 1

[0059] The carbon fiber composite core layer is prepared according to Example 1

[0060] As shown in Figure 6 , 1 mm thick polyimide fiber fabric is wound on the carbon fiber composite core layer 1, and after winding 15 layers, a composite containment casing with a containment area thickness of 15 mm is obtained, the same resin matrix as in Example 1 is filled in the fabric, and after heating and solidification, a composite containment casing is obtained.

[0061] Comparative Example 2

[0062] Referring to Example 1, the difference between Example 1 and Example 2 is that the weft yarn is broken once after every 2 columns of weft yarn weaving, forming 50 weft yarn joints.

[0063] Comparative Example 3

[0064] Referring to Example 1, the difference between Example 1 and Example 3 is that the warp yarn is broken 3 times along the axial direction of the casing, forming 3 warp yarn joints.

[0065] Analog blade with a mass of 1000 g is used to fly and impact the containment casings in the above cases under high-speed rotating state, and by carrying out blade fly and impact casing tests at different rotating speeds, the containment state of the casing under different containment energy is determined, and the test data is shown in Table 1.

[0066] Table 1 Comparison of containment performance of composite casings with different structures

[0067]

[0068] Compared with the comparative examples, the method provided by the application can obviously improve the containment performance of the composite containment case. For example, the composite containment case in Example 1 and Example 2 has a containment energy of 77769J and 61839J respectively, and the blade does not penetrate the containment case to form a containment state. The containment case with the preform winding structure in Comparative Example 1 has interlaminar interface failure at an energy level of 52758J to form an uncontained state. Comparative Example 2 and Comparative Example 3 have weak points at the weft / warp joint, and the joint point also fails to form an uncontained state.

[0069] The test results show that the double-layer structure composite case prepared in Example 1 is damaged, and after being impacted by a high-speed flying blade, only scratches appear on the inside of the case, and no delamination failure occurs. The composite case prepared in Comparative Example 1 is damaged, and after being impacted by a high-speed flying blade, the containment layer of the case has obvious interlaminar interface failure, and the multi-layer wound preform is separated after being impacted, and cannot contain the failed blade. As shown in Figure 7 and Figure 8 .

[0070] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, and these modifications or replacements should be covered within the protection scope of the application.

Claims

1. A method for preparing a double-layer composite material enclosure casing, characterized in that, The preparation method is as follows: (1) preparing the carbon fiber composite core layer: carbon fiber prepreg is laid on the forming core mold, and the net size carbon fiber composite core layer is obtained after curing and demolding; (2) preparing the organic fiber composite containment layer: a) determining the number of organic fiber warp yarns N according to the thickness H requirement of the containment layer, arranging M columns of warp yarns on the surface of the carbon fiber composite core layer along the ring direction of the machine case, starting from the upper end of the containment area, introducing the first course of weft yarns through the cross openings of the first column of warp yarns, and then sequentially passing through the cross openings of the first layer of the i-th column and the i+1-th column of warp yarns along the ring direction of the machine case, and returning to the starting position of the first course of weft yarns after passing through M columns of warp yarns, and then moving outward by a distance of H / N along the thickness direction to form the second course of weft yarns, and sequentially passing through the cross openings of the second layer of the i-th column and the i+1-th column of warp yarns along the ring direction of the machine case, and returning to the starting position of the second course of weft yarns after passing through M columns of warp yarns, and then moving inward by a distance of H / N along the thickness direction to form the second course of weft yarns, and sequentially completing N courses of weft yarns to interlock N layers of warp yarns to achieve the specified thickness H, and completing the weaving of the first column of weft yarns, at this time the weft yarns are located at the Nth course of the first column; b) moving the weft yarns by a distance b along the axial direction of the core layer, and then sequentially passing through the cross openings of the Nth layer of the i+1-th column and the i+2-th column of warp yarns to form the Nth course of weft yarns of the second column, and returning to the starting position of the Nth course of weft yarns of the second column after passing through M columns of warp yarns, and then moving inward by a distance of H / N along the thickness direction to form the N-1th course of weft yarns by passing through the cross openings of the N-1th layer of the i+1-th column and the i+2-th column of warp yarns along the ring direction of the machine case, and sequentially completing N courses of weft yarns to interlock N layers of warp yarns to achieve the specified thickness H, and completing the weaving of the second column of weft yarns, at this time the weft yarns are located at the first course of the second column, and the weaving of the first course of weft yarns of the next column is started by moving the weft yarns by a distance b along the axial direction of the core layer; c) repeating steps a) and b), and completing the weaving of P / b columns of weft yarns to achieve the required width P of the containment layer along the axial direction, and obtaining the overall woven organic fiber containment layer; d) curing the composite containment machine case: filling resin in the organic fiber containment layer and heating to cure, to obtain a double-layer structure composite containment machine case.

2. The production method according to claim 1, characterized by, The laying method of the carbon fiber composite core layer on the forming core mold is one or more of manual laying, self-conveying and automatic laying.

3. The preparation method according to claim 1, characterized in that, The organic fiber yarns of the containment layer are arranged in the axial direction of the machine case as the warp direction and in the ring direction of the machine case as the weft direction.

4. The production method according to claim 1, characterized by, The warp yarns and weft yarns of the organic fiber of the containment layer are continuous yarns.

5. The production method according to claim 1, characterized by, The warp yarns passing through the cross openings of the odd-numbered column of weft yarns in the weft yarns of the containment layer are the same, the warp yarns passing through the cross openings of the even-numbered column of weft yarns are the same, and the warp yarns passing through the cross openings of the odd-numbered column of weft yarns and the even-numbered column of weft yarns are different, forming an alternating interlocking structure along the ring direction of the machine case to eliminate the interface between the columns of warp yarn arrangement; The continuous weft yarns pass through the openings of one layer of warp yarns after one revolution around the machine case, then move along the thickness direction and continue to pass through the openings of the next layer of warp yarns until the specified thickness H is reached, thereby eliminating the interface between the layers of warp yarn arrangement.

6. The method of claim 1, wherein, i is a positive integer, i≤M-1.

7. The preparation method according to claim 1, characterized in that, The organic fiber of the containment layer is one or more of aramid fiber, high molecular weight polyethylene fiber, poly-p-phenylene benzobisoxazole fiber, poly-p-phenylene imidazole fiber, poly-phenylene pyridine di-imidazole fiber and polyimide fiber.

8. A double-layered structural composite containment case, prepared according to the method of claim 1, consisting of a carbon fiber composite core layer and an organic fiber composite containment layer, characterized in that: wherein, The carbon fiber composite core layer is prepared by laying and pasting unidirectional carbon fiber prepreg and hot press tank molding technology; The organic fiber composite containment layer is integrally woven on the carbon fiber composite core layer by organic fiber, and is prepared by RTM molding technology; the integral weaving rules of the organic fiber of the containment layer are as follows: The organic fiber yarn of the containment layer is woven in the axial direction of the machine box as the warp and in the ring direction of the machine box as the weft, wherein the warp and weft of the organic fiber yarn are continuous yarns; The total number of weft yarns is P / b, wherein P is the width required by the containment layer in the axial direction, and b is the distance moved by the weft yarn in the axial direction of the core layer; The warp of the cross opening passed by the odd number column weft yarn is the same, the warp of the cross opening passed by the even number column weft yarn is the same, the warp of the cross opening passed by the odd number column weft yarn and the even number column weft yarn is different, an interactive interlocking structure is formed in the ring direction of the machine box, and the interface between the warp arrangement columns is eliminated; the continuous weft yarn passes through a layer of warp opening after winding around the machine box for one turn, moves in the thickness direction, and then continues to pass through the next layer of warp opening until the specified thickness H is reached, and the interface between the warp arrangement layers is eliminated.

Images