Preparation method of three-dimensional warp-direction interlocking woven composite material with different reinforced structures

Abstract

The invention relates to the technical field of composite materials with textile structures, in particular to a preparation method of a three-dimensional warp-direction interlocking woven composite material with different reinforced structures, which comprises the following steps: firstly, carrying out straightening treatment on aramid fibers, and adopting the aramid fibers as warp and weft yarns, weaving a three-dimensional warp-direction interlocking woven fabric preform on a three-dimensional rapier loom controlled by a computer; preparing a resin matrix from epoxy resin, a reactive diluent and a polyether amine curing agent; carrying out vacuum-assisted resin transfer molding on the woven aramid fiber three-dimensional warp-direction interlocking woven fabric; and the three-dimensional warp-direction interlocking woven composite material with different reinforced structures is prepared by regulating and controlling a stacking mode. Through fiber low-damage weaving, structure regulation and control design and orthogonal interlocking lamination, the problems of layering sensitivity and anisotropy of the three-dimensional warp-direction interlocking woven composite material under the extreme load can be solved, and technical support is provided for achieving the excellent mechanical property, low-damage manufacturing, low cost and light weight of the three-dimensional woven composite material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile structure composite materials, and particularly relates to a preparation method of a three-dimensional warp interlocking woven composite material with different reinforcing structures. BACKGROUND

[0002] The three-dimensional warp interlocking structure is a typical three-dimensional fabric structure, and the reinforcing effect in the thickness direction is remarkable due to the complex interlacing and superposition of the warp and weft yarns, and is widely used in the fields of national defense and military industry, aerospace, protective equipment and rail transportation. The traditional three-dimensional woven structure has problems such as unbalanced interlayer performance and stress concentration leading to a decrease in tensile performance. Meanwhile, existing researches mainly focus on the influence of a single parameter (such as weft density or weaving angle), and lack of a systematic scheme for synergistically controlling the number of warp layers, weft density, lamination method and cutting angle. In addition, aramid fibers are prone to fuzzing during weaving, which leads to weak interfacial bonding and the problem of structure design not being adapted to the fiber characteristics. Therefore, it is increasingly important to control the fabric structure to obtain ideal physical and mechanical properties of the material. The number of composite layers, weft density and lamination design are key fabric structure parameters, which not only reflect the arrangement density, mutual extrusion degree and space filling efficiency of the warp and weft yarns, but also affect the mechanical properties of the composite material by affecting the geometric morphology of the fiber bundle (such as bending degree and yarn cross section).

[0003] Therefore, the present application proposes a preparation method of a three-dimensional warp interlocking woven composite material with different reinforcing structures, which comprehensively considers the overall relationship between structure and mechanical properties, synergistically controls the structure parameters, weft density and lamination method, and designs three-dimensional warp interlocking woven composite materials with different structures, so as to improve the strength, impact resistance and delamination resistance of the composite material. SUMMARY

[0004] The present application aims to solve the problems existing in the prior art, and proposes a preparation method of a three-dimensional warp interlocking woven composite material with different reinforcing structures. The method of low-damage weaving of aramid fibers, high weft density structure design and orthogonal lamination process is used to innovatively design a three-dimensional warp interlocking reinforcing structure (3 layers of warp yarns / 4 layers of weft yarns, 5 layers of warp yarns / 6 layers of weft yarns). The weft density and weaving angle are adjusted to optimize the arrangement of the three-dimensional fabric, so as to realize the interface strengthening, stress optimization and failure control of the aramid three-dimensional warp interlocking woven composite material, and improve the mechanical properties such as tensile strength, delamination resistance and impact resistance. The present application provides support for the application of three-dimensional woven composite materials in national defense and military industry, rail transportation, aerospace and other fields.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The present application proposes a preparation method of a three-dimensional warp interlocking woven composite material with different reinforcing structures, which comprises the following steps:

[0007] Step 1, first, the aramid fiber is straightened, aramid fiber is used as warp and weft yarn, three-dimensional rapier loom controlled by computer is used to weave three-dimensional warp interlocking woven fabric preform with different layer structure, weft density and weaving angle, low friction yarn guide device is used to avoid the breakage of aramid fiber due to delamination, and the weaving speed is controlled at 50-80 rpm;

[0008] Step 2, the resin matrix is configured by using epoxy resin E51, active diluent 692 and polyether amine curing agent D230;

[0009] Step 3, the woven aramid three-dimensional warp interlocking woven fabric is formed by vacuum assisted resin transfer molding;

[0010] Step 4, three-dimensional warp interlocking woven composite materials with different reinforcement structures are finally prepared by adjusting the lamination mode.

[0011] Preferably, in step 1, the aramid fiber is aramid 1414 (1000D), the straightening of the aramid fiber is to keep the aramid fiber straight during weaving by precise tension control, minimize bending (bending angle <5°), and control the interlayer distance ≥0.2mm, keep the distance between layers while reducing the friction between layers. The three-dimensional warp interlocking woven fabric with different layer structure, weft density and weaving angle is designed as 3 layers of warp yarn / 4 layers of weft yarn and 5 layers of warp yarn / 6 layers of weft yarn respectively, to ensure similar area density (0.73-0.90 kg / m 2 ), four kinds of fabrics are prepared by adjusting the weft density (5-8 roots / cm) and weaving angle (17°-36°), numbered as 3DA1, 3DA2, 3DA3, 3DA4.

[0012] Preferably, in step 2, the resin matrix is configured by mixing the epoxy resin E51 and the diluent 692 uniformly by mechanical stirring for 10 min, then adding the polyether amine curing agent, continuing to stir for 15 min to homogeneous state, vacuum degassing for 30 min, vacuum degree is-0.095 MPa, the ratio of epoxy resin, diluent and curing agent is (100:15):30.

[0013] Preferably, in step 3, the process flow of vacuum assisted resin transfer molding is as follows: the fabric preform with single layer, same direction lamination and orthogonal lamination is placed in the mold, the mold is sealed and vacuumed to-0.1 MPa negative pressure state, the resin matrix is injected at 25℃, the flow rate is controlled at 0.5 L / min to ensure complete impregnation of the fabric, pre-cured at room temperature for 2h, then heated to 80℃ at a rate of 2℃ / min and kept for 4h to completely cure, and then naturally cooled to room temperature and demolded.

[0014] Preferably, in step 4, the regulation lamination mode is to prepare two kinds of composite material structures of the same direction lamination 0° / 0° and the orthogonal lamination 0° / 90°, sample numbers are 3DA4-L and 3DA4-OL, and finally six kinds of three-dimensional warp interlocking woven composites with different reinforcing structures are prepared.

[0015] By adopting the technical scheme, the application can solve the problems of the three-dimensional warp interlocking woven composite material, such as the delamination sensitivity and anisotropy under extreme load, by low-damage weaving of fibers, structure regulation design and orthogonal interlocking lamination, and provide technical support for realizing excellent mechanical properties, low-damage manufacturing, low cost and light weight of the three-dimensional woven composite material, and provide design ideas for the application of the three-dimensional warp interlocking woven composite material in the fields of aerospace, bulletproof armor, automobile light weight and marine engineering.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] 1. Compared with the traditional three-dimensional woven composite material, the application realizes the fine design of the mechanical behavior of the three-dimensional woven composite material by low-bending weaving, high-weft-density interlocking structure design regulation and orthogonal lamination design. The fiber state is optimized according to the easy-fuzzing characteristic of aramid fiber, the fiber straightness is maintained by the low-bending weaving process, and the interfacial bonding strength is improved. The interlayer reinforcement design is performed on the three-dimensional composite material, the delamination is inhibited by the warp-weft yarn interlocking effect, the interlayer strength is improved compared with the single-layer three-dimensional composite material, the synergistic control of the warp yarn layer number, weft density and lamination mode is proposed, the fabric tightness is improved by increasing the weft density, the resin-fiber mechanical engagement is promoted, the fabric tightness and the interfacial bonding performance are improved, and the imbalance bottleneck of the interlayer performance is broken. The relationship between the reinforcing structure and the failure mode is clarified, and a basis is provided for the subsequent targeted three-dimensional fabric and laminated design and actual application.

[0018] 2. The innovative regulation design of the application has significant advantages in extreme load scenarios such as national defense and aerospace. The three-dimensional woven interlocking structure endows the material with excellent delamination resistance, and can replace the traditional laminated armor. The structure avoids delamination failure in ballistic impact and is suitable for scenarios such as bulletproof inserts and armored vehicle liners. The application of aramid composite materials in the field of bulletproof has been mature, but the traditional three-dimensional fabric laminated plate has the risk of delamination failure. The application solves the core pain points such as interfacial failure and mechanical strength attenuation of high-performance composite materials under extreme working conditions by three-dimensional whole weaving and orthogonal lamination design, and provides an engineeringizable technical path for the lightweight, long-life and high-reliability requirements of major equipment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The tensile property fracture comparison graph and the tensile fracture morphology graph of different angles of the application embodiment 4 are shown in the figure.

[0020] Figure 2 Figure 4 is a tensile fracture micro-morphology diagram of different tensile angles (0°, 30°, 45°, 60°) of the embodiment 4 of the present application;

[0021] Figure 3 Figure 5 is a tensile load-displacement curve and a column chart of the tensile properties of the aramid three-dimensional warp interlocking woven composite material of the embodiment 1, 2, 3, 4 of the present application;

[0022] Figure 4 Figure 6 is an optical microscope diagram of the warp yarn section of the aramid three-dimensional warp interlocking woven composite material of the embodiment 1, 2, 3, 4 of the present application;

[0023] Figure 5 Figure 7 is a scanning electron microscope diagram of the warp yarn section of the aramid three-dimensional warp interlocking woven composite material of the embodiment 1, 2, 3, 4 of the present application;

[0024] Figure 6 Figure 8 is a column chart of the tensile properties of the aramid three-dimensional warp interlocking woven composite material of the embodiment 4, 5, 6 of the present application under different lamination processes;

[0025] Figure 7 Figure 9 is a schematic diagram of the fabric structure of the embodiment 1, 2, 3, 4 of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings, so that the persons skilled in the art can better understand the advantages and features of the present application, and the protection scope of the present application can be defined more clearly. The described embodiments of the present application are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by the persons skilled in the art without creative labor are within the protection scope of the present application.

[0027] Embodiment 1:

[0028] A preparation method of a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0029] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, and a 5-layer warp yarn / 6-layer weft yarn layer structure is woven on a computer-controlled three-dimensional rapier loom. The weft density is adjusted to 5 roots / cm, and the weaving angle is 17°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, and the vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The single-layer fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, the fabric is completely immersed, and the pre-cured is placed at room temperature for 2 h, then heated to 80°C at a rate of 2°C / min and kept for 4 h to completely cure, and then naturally cooled to room temperature and demolded. Finally, a three-dimensional warp interlocking woven composite material 3DA1 with a reinforcing structure is prepared.

[0030] Example 2:

[0031] A method for preparing a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0032] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, and a 5-layer warp yarn / 6-layer weft yarn layer structure is woven on a computer-controlled three-dimensional rapier loom. The weft density is adjusted to 5 roots / cm, and the weaving angle is 17°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, and the vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The single-layer fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, the fabric is completely immersed, and the pre-cured is placed at room temperature for 2 h, then heated to 80°C at a rate of 2°C / min and kept for 4 h to completely cure, and then naturally cooled to room temperature and demolded. Finally, a three-dimensional warp interlocking woven composite material 3DA1 with a reinforcing structure is prepared.

[0033] Example 3:

[0034] A method for preparing a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0035] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, a 3-layer warp yarn / 4-layer weft yarn structure is woven on a computer-controlled three-dimensional rapier loom, the weft density is adjusted to 7 roots / cm, and the weaving angle is 34°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The single-layer fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, ensuring complete impregnation of the fabric, pre-curing at room temperature for 2 h, then heating to 80°C at 2°C / min and keeping for 4 h to complete curing, and natural cooling to room temperature for demolding. Finally, a three-dimensional warp interlocking woven composite material 3DA3 with a reinforcing structure is prepared.

[0036] Example 4:

[0037] A method for preparing a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0038] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, a 3-layer warp yarn / 4-layer weft yarn structure is woven on a computer-controlled three-dimensional rapier loom, the weft density is adjusted to 8 roots / cm, and the weaving angle is 36°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The single-layer fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, ensuring complete impregnation of the fabric, pre-curing at room temperature for 2 h, then heating to 80°C at 2°C / min and keeping for 4 h to complete curing, and natural cooling to room temperature for demolding. Finally, a three-dimensional warp interlocking woven composite material 3DA4 with a reinforcing structure is prepared.

[0039] Example 5:

[0040] A method for preparing a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0041] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, and a 3-layer warp yarn / 4-layer weft yarn layer structure is woven on a computer-controlled three-dimensional rapier loom, the weft density is adjusted to 8 roots / cm, and the weaving angle is 36°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The same direction 0° / 0° fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, ensuring complete impregnation of the fabric, pre-curing at room temperature for 2 h, then heating to 80°C at 2°C / min and keeping for 4 h to complete curing, and natural cooling to room temperature to demold. Finally, a three-dimensional warp interlocking woven composite material 3DA4-L with a reinforcing structure is prepared.

[0042] Example 6:

[0043] A method for preparing a three-dimensional warp interlocking woven composite material with different reinforcing structures, comprising the following steps:

[0044] The aramid fiber is straightened, aramid fiber is used as warp and weft yarns, and a 3-layer warp yarn / 4-layer weft yarn layer structure is woven on a computer-controlled three-dimensional rapier loom, the weft density is adjusted to 8 roots / cm, and the weaving angle is 36°. The epoxy resin E51 is mixed uniformly with the diluent 692 by mechanical stirring for 10 min, then the polyether amine curing agent is added, and the stirring is continued for 15 min to a homogeneous state, vacuum degassing for 30 min, vacuum degree is -0.095 MPa. The resin system formula is that the ratio of epoxy resin, diluent and curing agent is (100:15):30. The same direction 0° / 0° fabric preform is placed in the mold, the mold is sealed and vacuumed to -0.1 MPa negative pressure state, the resin system is injected at 25°C, the flow rate is controlled at 0.5 L / min, ensuring complete impregnation of the fabric, pre-curing at room temperature for 2 h, then heating to 80°C at 2°C / min and keeping for 4 h to complete curing, and natural cooling to room temperature to demold. Finally, a three-dimensional warp interlocking woven composite material 3DA4-L with a reinforcing structure is prepared.

[0045] Table 1 Fabric parameter changes

[0046]

[0047]

[0048] Table 2 Aramid three-dimensional warp interlocking woven composite material parameters

[0049]

[0050] Figure 7 The three-dimensional yarn interlacing patterns and planar weave point maps of four kinds of aramid three-dimensional warp interlocking woven composites (3DA1-3DA4) are shown, the yarn interlacing rules are described, and the fabric cross-section or partial enlarged view is shown, which intuitively shows the bending shape of the yarn, the interlayer connection mode. Table 1 shows the key weaving parameter differences of the four kinds of aramid three-dimensional warp interlocking woven composites (3DA1-3DA4) of examples 1, 2, 3, 4, which are used for subsequent analysis of the influence of these parameters on the tensile properties of the composite; Table 2 shows the preparation parameters of six kinds of aramid three-dimensional warp interlocking woven composites (3DA1-3DA4, 3DA4-L, 3DA4-OL) of examples 1, 2, 3, 4, 5, 6, which can significantly regulate the performance through the layer design.

[0051] As Figure 3 , the tensile properties comparison and fracture morphology of aramid three-dimensional warp interlocking woven composites at different angles are shown. Examples 1-6 are cut into samples with a width of 25mm and a length of 250mm using a WG-1200 multifunctional ceramic tile cutter according to GB / T 1449-2005 "Tensile properties test method for fiber reinforced plastics". The sample is cut in the clockwise direction with the warp yarn of the three-dimensional angle fabric as the 0° (warp yarn direction) reference line. The orientation angle of the test piece is selected as 0° (warping direction), 30°, 45° and 60°. The test is carried out on an Instron 5969 universal material testing machine, and the clamping length of the two ends of the sample is 40mm. The loading speed is set to 2mm / min for tensile test, and the effective sample of each specification is 5.

[0052] Figure 1 The load-displacement curves (left) of samples at different angles (0°, 30°, 45°, 60°) and the macroscopic fracture morphology of example 4 are shown. As shown in the figure, the load-displacement curve shows a nonlinear characteristic, the curve shows a linear increase at the initial stage, and the load changes slowly after reaching a certain value until the sample fails. From I to II, the load increases linearly, and the strain first occurs at the buckling warp yarn. In stage II, the load increases slowly (the resin cracks, and the fiber freedom increases), and in stage III, the axial fiber dominates the load until the fracture, and the fracture surface is always parallel to the distribution direction of the warp yarn, because the warp yarn is the main load-bearing yarn. The macroscopic fracture morphology of the sample is captured by the camera, and the deformation in the middle of example 4 is greater than that at both ends, showing a "waist" phenomenon, which proves that the weft yarn is subjected to tension to produce tangential displacement (right), and as the load angle increases, the weft yarn length increases, the tangential displacement increases, and the "waist" degree intensifies. Figure 1

[0053] Figure 2 ​The tensile fracture micro-morphology of different stretching angles (0°, 30°, 45°, 60°) of Example 4 is shown. When the stretching angle is 0°, the fracture surface is flat, and the resin-rich area is sheared and destroyed; when the stretching angle is 30°, the warp yarn fracture is inclined tubular; when the stretching angle is 45°, the inclined tubular fracture and the fiber pull-out; when the stretching angle is 60°, the warp yarn is extracted, and the fiber bundle is loose. The evolution law of failure mode with stretching angle is revealed, Figure 2 The fracture morphology research provides inspiration and theoretical support for the optimization design of future aramid three-dimensional woven composites.

[0054] As Figure 3 reveals the influence mechanism of weaving parameters of Examples 1, 2, 3, and 4 on the tensile properties of aramid three-dimensional warp interlocking woven composites. Through the tensile load-displacement curves of different weaving parameters, the 3DA4 (with the highest weft density) composite material presents the steepest linear segment in the weft direction, proving that the increase of weft density can significantly optimize the weft stiffness (left figure). The column chart compares the performance values of the four fabrics (3DA1-3DA4) in the warp and weft directions, revealing that controlling the weaving angle ≤20° can avoid the warp bearing fracture.

[0055] Figure 4 and Figure 5 The cross-sectional schematic diagram of the warp yarn in the aramid three-dimensional warp interlocking woven composites of Examples 1, 2, 3, and 4 is revealed. The cross-section of the composite material is polished smooth using a polishing machine OMP 2110, and its microstructure is observed under an optical microscope and a scanning electron microscope. It is observed that the increase of weft density reduces the yarn spacing and increases the buckling angle Figure 4 . As Figure 5 shown, the cross-sectional morphology of 3DA1 to 3DA4 changes from flat-elliptical-classical circle-right circle. When the weft density is high, the fiber bundle is tight, the resin is evenly infiltrated, and the interfacial bonding is enhanced, although the warp strength is reduced, but the weft strength is improved.

[0056] Figure 6 The influence of the lamination process on the tensile properties of the aramid three-dimensional warp interlocking woven composites of Examples 4, 5, and 6 is revealed. When the lamination is in the same direction, the warp strength increases by 41%, and the modulus increases by 23%, proving that lamination can break through the inherent anisotropy of the material, and for the first time provides a design double path of "same direction strengthening" and "orthogonal balance", and reveals the strain mismatch mechanism of the resin layer.

[0057] In summary, the aramid three-dimensional warp interlocking woven composite material prepared by the present application has significant advantages through unique structural design. The three-dimensional warp interlocking structure forms mechanical interlocking through the three-dimensional interweaving of warp and weft yarns, greatly improving the interlaminar bonding strength. Tensile test shows that even under high load fracture, the material still has no obvious delamination phenomenon. This characteristic is due to the crack propagation inhibition ability of the interlocking point, effectively avoiding the interlaminar peeling problem commonly seen in traditional laminated composites, and is particularly suitable for scenarios that bear impact or fatigue load. By adjusting the weft density, the weft tensile strength is significantly improved, while the warp strength is slightly sacrificed, but the orthogonal laminated design can achieve balanced performance in both directions. Increasing the weft density changes the cross-sectional shape of the yarn, making the fiber bundle tighter, improving the interfacial bonding force, and promoting the material to change from fiber-by-fiber fracture to overall coordinated failure, thereby improving energy absorption efficiency. The tight structure of the prepared high weft density fabric (3DA4) strengthens the resin-fiber interfacial bonding, and the stress concentration in the resin-rich area is effectively dispersed through the friction and adhesion between yarns, delaying crack initiation and improving material toughness. Compared with traditional three-dimensional fabrics, the warp interlocking structure does not need to introduce additional thickness direction yarns, but only needs to stack warp yarns to increase the thickness direction reinforcement, reducing the amount of raw materials and the complexity of weaving, meeting the needs of industrialized mass production, and having broad application prospects in impact-resistant protection, automotive safety structures and lightweight structural parts.

[0058] The description and practice disclosed in the present application are easy to think and understand for ordinary skilled persons in the technical field, and several improvements and refinements can be made without departing from the principles of the present application. Therefore, modifications or improvements made without departing from the spirit of the present application should also be considered within the scope of protection of the present application.

Claims

1. A method of making a three-dimensional, machine direction interlocking woven composite material having different reinforcement structures, characterized by, Comprising the following steps: Step 1, first, the aramid fiber is straightened, aramid fiber is used as warp and weft yarn, three-dimensional rapier loom controlled by computer is used to weave three-dimensional warp interlocking woven fabric preform with different layer structure, weft density and weaving angle, low friction yarn guide device is used to avoid the hair breakage of aramid fiber due to delamination, and the weaving speed is controlled at 50-80 rpm; Step 2, the resin matrix is prepared by using epoxy resin E51, active diluent 692 and polyether amine curing agent D230; Step 3, the woven aramid three-dimensional warp interlocking woven fabric is molded by vacuum assisted resin transfer molding; Step 4, by adjusting the lamination mode, three-dimensional warp interlocking woven composite materials with different reinforcing structures are finally prepared.

2. A method of making a three-dimensional, machine direction interlocking woven composite material having different reinforcement structures according to claim 1, wherein, In step 1, the aramid fiber is aramid 1414, the straightening treatment of the aramid fiber is to keep the aramid fiber straight during weaving by precise tension control, and the three-dimensional warp interlocking woven fabric with different layer structure, weft density and weaving angle is designed as 3 layers of warp yarn / 4 layers of weft yarn and 5 layers of warp yarn / 6 layers of weft yarn.

3. The method of making a three-dimensional, machine direction interlocking woven composite material with different reinforcement structures according to claim 1, wherein, In step 2, the resin matrix is prepared by mixing epoxy resin E51 and diluent 692 mechanically for 10 min, then adding polyether amine curing agent, continuing to stir for 15 min to homogeneous state, vacuum degassing for 30 min, vacuum degree is-0.095 MPa, and the ratio of epoxy resin, diluent and curing agent is (100:15):

30.

4. The method of making a three-dimensional, machine direction interlocking woven composite material with different reinforcement structures according to claim 1, wherein, In step 3, the process flow of vacuum assisted resin transfer molding is as follows: the fabric preform with single layer, same direction lamination and orthogonal lamination is placed in the mold, the mold is sealed and vacuumed to-0.1 MPa negative pressure state, the resin matrix is injected at 25℃, the flow rate is controlled at 0.5 L / min to ensure complete impregnation of the fabric, the sample is pre-cured at room temperature for 2 h, then heated to 80℃ at a rate of 2℃ / min and kept for 4 h to completely cure, and then naturally cooled to room temperature and demolded.

5. The method of making a three-dimensional, machine direction interlocking woven composite material with different reinforcement structures according to claim 1, wherein, In step 4, the lamination mode is to prepare two kinds of composite material structures of same direction lamination 0° / 0° and orthogonal lamination 0° / 90°, and the sample numbers are 3DA4-L and 3DA4-OL, and finally six kinds of three-dimensional warp interlocking woven composite materials with different reinforcing structures are prepared.

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