122 results about "Braided composite" patented technology

The invention belongs to the technical field of metal matrix composite materials, and relates to a tungsten-copper three-dimensional orthogonal woven composite material and an intelligent design method thereof.The composite material comprises a space interwoven network structure formed by tungsten fiber skeletons arranged in the X orthogonal direction, the Y orthogonal direction and the Z orthogonal direction, and the tungsten fiber skeletons are wrapped by a copper matrix to form a three-dimensional heterogeneous composite system; the method comprises the following steps: generating a composite material structure based on parametric modeling, acquiring mechanical and electrical performance data by utilizing finite element and multi-physics field simulation, and constructing a structure-performance data set; performing performance prediction by adopting three types of machine learning models, namely ANN, SVR and LightGBM, and determining an optimal model in combination with Bayesian optimization; performing parameter reverse screening based on the optimal agent model, screening a structural combination meeting performance constraints, and constructing a closed-loop optimization process through simulation verification and model iteration; according to the method, efficient design and accurate performance prediction of the composite material structure can be realized, and the method is suitable for high-performance electromagnetic structural materials.

The invention discloses a model construction and simulation method and device for a woven composite material and a storage medium, and the method comprises the steps: endowing a fiber bundle model and a porous matrix model with material performances at a microscopic scale, then applying a multi-physical field load, and extracting a thermal-mechanical response; homogenizing the microscopic model into material performance and transmitting the material performance to the microscopic model; constructing a woven composite material model through structural parameters on a microscale, and endowing the performance of the homogenized fiber bundles and the homogenized porous matrix; the periodic boundary condition of the service condition of the macrostructure and the multi-physical field load are applied to the mesoscopic model to obtain the thermal-mechanical response and performance degradation condition of the mesoscopic model and the fatigue damage condition under the cyclic load, and progressive failure analysis is completed; the actual response of the macrostructure in the multi-physical field is obtained; low-cost and high-precision numerical simulation and performance prediction of multiple scales and multiple physical fields are realized.

The invention relates to the technical field of three-dimensional woven composite material detection, solves the technical problem that defects of carbon fiber yarns and woven preforms cannot be detected in real time in a three-dimensional weaving production line in a traditional method, and particularly relates to a defect detection method for an aero-engine fan blade preform. Comprising the steps of collecting an original image in real time and preprocessing the original image; performing feature extraction on the preprocessed image to obtain a multi-scale feature map containing global features and local features; and constructing a defect perception decoupling detection module for decomposing a defect detection task into two sub-tasks of position modeling and size estimation, and optimizing the initial candidate box to obtain a defect result set. According to the invention, real-time, high-precision and automatic detection of defects of carbon fiber yarns and woven preforms can be realized, the quality control capability of an aero-engine fan blade preform production line is remarkably improved, and the strict production standard of the aviation industry is met.

The invention discloses an integrated design method for a woven composite variable-curvature reinforced thin-wall structure, and the method comprises the steps: achieving the parametric modeling of a design model of the woven composite variable-curvature reinforced thin-wall structure through a Python language; the method comprises the following steps of: modeling a woven composite material variable curvature reinforced thin-wall structure design model for each sample point sampled in a design space of design variables, performing instability mechanical response solution by utilizing finite element software explicit dynamics, and then selecting a design variable optimal solution based on a deep neural network model in combination with a multi-objective optimization algorithm; and according to the optimal solution of the design variable, the variable-curvature reinforced thin-wall structure of the woven composite material is constructed. According to the method, integrated structural design is conducted on the woven composite material and the variable-curvature reinforced thin-wall structure, the design space of the woven composite material variable-curvature reinforced thin-wall structure is rich, the bearing efficiency of the woven composite material variable-curvature reinforced thin-wall structure is improved, and the further lightweight design requirement of the related engineering field is met.

The invention discloses a braided composite material microcosmic modeling calculation analysis method, which belongs to the technical field of analogue simulation calculation, and comprises the following steps: carrying out simulation modeling on a braided composite material through a finite element analysis method to obtain a finite element model of the composite material; performing volume fraction calculation on the fiber bundles in the finite element model, and obtaining performance parameters through a rigidity and strength theoretical model according to a volume fraction calculation result; based on a failure starting criterion, whether a damage mode occurs is judged according to the performance parameters, and the failure starting criterion is a failure criterion; when a damage mode appears, evolving the damage mode through a three-dimensional progressive damage model, and smoothing the evolutionary process through a regularization model to obtain a damage evolution coefficient analogue simulation result of the woven composite material, so as to realize effective and accurate modeling analysis calculation on failure and damage evolution of the composite woven material.

The invention relates to the field of woven materials, in particular to a fiber hybrid woven composite material based on bionic multistage gradient design. The material is obtained through material gradient design, structure gradient design and interface gradient design. The material comprises a surface layer high-rigidity area, a transition area and a core high-toughness area, wherein the surface layer high-rigidity area adopts carbon fibers I as warp and weft yarns; in the transition area, basalt fibers I are adopted as weft yarns, carbon fibers II are adopted as warp yarns, and Z-direction yarns are aramid fibers I; warp yarns of the core high-toughness area are basalt fibers II, and weft yarns and Z-direction yarns of the core high-toughness area are aramid fibers II. The defects of stress concentration, insufficient interlayer toughness, interface slippage and the like existing in traditional plain / twill weaving are effectively overcome. According to the design, on the premise that the cost is kept controllable, the interlayer performance, the impact resistance and the energy absorption characteristic of the composite material are remarkably improved by optimizing the three-dimensional combination mode of the warp yarns, the weft yarns and the Z-direction yarns at each stage, and the synergistic enhancement of mechanical properties is achieved.

The invention provides an intelligent tension control method and system for a three-dimensional weaving machine, and the method comprises the steps: determining the standard tension ranges of the three-dimensional weaving machine in weft releasing, weft insertion and beating-up processes based on weaving process parameters in combination with the acceptance standard of a three-dimensional braided fabric; based on a visual sensor and a tension sensor, tension monitoring is carried out on the track processes of the weft releasing track, the weft insertion track and the beating-up track, and the tension which does not conform to the standard tension range and the corresponding target track are determined; based on the intelligent adjustment rule, the tension and the corresponding target track are combined, the adjustment parameters of the weft motor are intelligently output, the weft motor is intelligently adjusted according to the adjustment parameters, the tension of the three-dimensional weaving machine in the working process all the time meets the requirement, and the quality of the finally generated three-dimensional weaving composite material is guaranteed.

The invention discloses a high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and a preparation method thereof, and belongs to the technical field of cable manufacturing, and the high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable sequentially comprises an optical fiber unit, a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and a sheath layer from inside to outside. The optical fiber unit adopts a ceramic silicone rubber buffer layer; the conductor layer is a nickel-plated copper alloy stranded wire, and the oxidation resistance is enhanced through nano titanium dioxide sol treatment; the insulating layer is of a three-layer co-extrusion structure; the shielding layer adopts an aluminum-plastic composite belt and tinned copper wire braided composite structure; the anti-corrosion layer is a polytetrafluoroethylene film subjected to plasma treatment; the sheath layer is made of two-component ceramic silicone rubber, is flexible after being vulcanized at normal temperature, and is converted into a ceramic body at high temperature. According to the optical fiber composite cable, through the collaborative design of a multi-layer structure, the performance of excellent continuous use stability, high salt mist environment corrosion resistance and the like is achieved, the optical fiber composite cable is suitable for high-temperature, corrosion, fire and other severe environments, and the safety and durability of the composite cable are remarkably improved.

The invention discloses a hedgehog-like thorn three-dimensional fiber three-dimensional woven composite material and a preparation method thereof. The composite material comprises at least two resin layers, at least two woven fiber layers and at least one connecting fiber layer, the connecting fiber layer comprises a plurality of strip-shaped attaching fibers; the winding part of the strip-shaped attaching fiber is positioned between the one-way strip-shaped fiber and the one-way fiber; and the non-winding part of the strip-shaped attaching fiber is attached to the other non-winding part of the strip-shaped attaching fiber. The woven fiber layer and the resin layer are of a rigid structure, the connecting fiber layer is of a flexible structure, and the woven fiber layer and the connecting fiber layer cooperate with each other and have excellent performance in the aspects of force bearing, load resistance, bending resistance, specific strength, specific buckling strength and the like. In addition, the one-way ribbon fibers and the one-way fibers are interwoven to form a woven fiber layer; the strip-shaped attaching fibers are interwoven on the one-way fibers of the two woven fiber layers to form the connecting fiber layer, and the strip-shaped attaching fibers are attached to each other, so that the effects of toughening and delaying buckling are achieved.

The invention discloses a continuous fiber reinforced three-dimensional woven composite bulletproof helmet and a preparation method thereof. The method comprises the following steps: firstly, designing an axial lining yarn organization structure with a stable structure; carrying out three-dimensional surveying and mapping on a helmet mold, and carrying out one-time forming knitting on the bulletproof helmet preform through flat knitting local knitting and a holding ring type needle retracting and releasing knitting method according to the three-dimensional hyperboloid structure of the helmet by adopting the axial lining yarn tissue structure; and then carrying out compression molding by adopting a resin film permeation process to prepare the continuous fiber reinforced composite bulletproof helmet. The bulletproof helmet made of the three-dimensional woven composite material is compact in structure, free of layering, uniform in overall thickness, free of lap joint and reinforcement of a main body material, continuous in fiber distribution, free of buckling, uniform in quality, high in material utilization rate and stable in performance, and meets the protection requirement. The defects that a traditional bulletproof helmet is tedious in process, low in production efficiency, high in processing cost, low in material utilization rate, discontinuous in fiber fracture, poor in manual layering and size stability and the like are overcome.

The auxiliary frame comprises an annular composite frame body and a metal connecting piece which is arranged on the frame body and used for being connected with a vehicle in an assembling mode, and the manufacturing method of the auxiliary frame comprises the steps that firstly, a foam core material is machined into a supporting template in the shape of the auxiliary frame body, and a metal insert is arranged on the supporting template; a connecting hole is formed in the metal insert; secondly, a reinforcing frame defined by fiber materials is woven outside the supporting formwork and the metal insert in a three-dimensional weaving mode; and thirdly, resin is injected into the reinforcing frame to be cured to form a composite frame body of the auxiliary frame, and the metal connecting piece is connected to the metal insert before or after resin injection. The formed auxiliary frame is obvious in weight reduction, capable of meeting the requirement for light weight, high in bearing capacity and outstanding in damage tolerance capacity and integrity, and therefore the industrial requirements for high strength, fatigue resistance, integrity and light weight of the automobile auxiliary frame are met.

A recyclable woven laminated plastic bag having features that further prevent leakage of contents out of the bag, or infestation of organisms into the contents of the bag is provided. In various aspects the bag can be fabricated from a woven polyethylene, polypropylene, or combination thereof layer which can be laminated using polyethylene, polypropylene, or combination thereof resin with a film layer formed from polyethylene, polypropylene, or combination thereof, can form a sealed corner bag and / or a diagonal sealed bag, and can have one or more sides include graphics and / or printing. The bag can also provide a top end and / or a bottom end either or both of which provide a discrete area which may contain discrete graphics and / or printing.

The application provides a three-dimensional braided composite coupling design method and system based on cross-scale analysis, and belongs to the technical field of electric digital data processing. The application establishes a representative volume element model with a specific braiding angle and fiber volume fraction for different spatial positions of the coupling; through finite element analysis and volume averaging method, the macroscopic equivalent elastic modulus and strength of each position are obtained; then a macroscopic finite element model of the coupling is established, and the equivalent performance parameters are given to analyze the failure index and natural frequency of the coupling under the design load; taking the minimization of the mass as the target, and taking the failure index and natural frequency as the constraints, an optimization model is constructed, and the braiding angle, volume fraction and structure size are iteratively adjusted through a heuristic algorithm to realize the lightweight and performance collaborative optimization of the coupling. The application solves the design problems caused by the multiple parameters and strong multi-scale coupling of the three-dimensional braided coupling, and can efficiently and automatically obtain an optimized design scheme meeting the requirements of complex working conditions.

The application discloses a two-dimensional woven composite material geometry modeling method, device, equipment and medium, relates to the technical field of composite material structure design and modeling, and is used for solving the technical problems that the simulation model precision and reliability are low in the prior art. The method comprises the following steps: an initial matrix model is created by using a random distribution algorithm and a Boolean subtraction operation; a two-dimensional woven unit cell model is created according to a preset yarn space trajectory formula; a multi-layer two-dimensional woven fiber bundle model is created according to a plurality of two-dimensional woven unit cell models; a reserved fiber bundle matrix model is created by performing a difference set on the initial matrix model and the multi-layer two-dimensional woven fiber bundle model; and a two-dimensional woven three-dimensional model containing random pores is created by in-situ assembly of the reserved multi-layer fiber bundle matrix model and the multi-layer two-dimensional woven fiber bundle model. Therefore, the simulation model precision and reliability can be improved by using the technologies of "random distribution algorithm, Boolean subtraction operation, reserved position and in-situ assembly".

This invention proposes a braided composite material flat sheet forming device and a braided composite material forming method, including a mandrel frame and a flexible and flattenable forming device. During braiding, the flexible forming device can be installed in a bent state within a slot in the mandrel frame, and after removal, it can return to a straight state to obtain a braided composite material preform with openings. The pre-embedded pins for the openings can be embedded in the flexible forming device according to design requirements. The mandrel frame can be clamped onto the traction mechanism of a braiding machine to obtain a multi-layered braided preform. This invention also includes a low-damage forming method for braided composite material flat sheets with openings. This invention has the advantages of high forming accuracy, minimal damage to the preform structure, low hole-making damage, and integrated forming.

The present invention discloses a method for analyzing the mesostructure reliability of a woven composite material, comprising the following steps: performing XCT scanning on the woven composite material structure to obtain a mesoscopic image of the interior of the woven composite material structure; grouping each yarn; measuring mesoscopic geometric parameters and recording the spatial coordinates of the measured parameters; establishing a mesoscopic geometric model based on the average values ​​of the mesoscopic geometric parameters; obtaining a probability density function of the cross-sectional area based on the real yarn; establishing a proxy model of the structure-function function using the response surface methodology; performing finite element meshing on the mesoscopic model; assigning material parameters to each region of the mesoscopic model; performing finite element calculations; and calculating the failure probability of each region under a given load using the verification point method. The present invention can simulate the differences in yarn mechanical properties caused by geometric factors without changing the mesoscopic geometric model; and based on the physical spatial distribution of structural characteristics, the material properties can characterize the presence of structural defects in specific regions.

An airfoil for a gas turbine engine. The airfoil includes an inner portion including a hollow fiber composite, and a surface portion including a solid fiber composite. The surface portion at least partially surrounds the inner portion. The hollow fiber composite of the inner portion can be a woven composite with at least one of a warp fiber or a weft fiber including a hollow carbon fiber. The hollow fiber composite of the inner portion also can be a braided composite with at least one strand including a hollow carbon fiber.

The invention relates to a non-destructive testing method for a woven composite material part, the fault volume of which has been acquired in advance and divided into a plurality of visual areas, characterized in that the method comprises the following steps: dividing the visual areas of the fault volume into three-dimensional sub-volumes; extracting a descriptor vector, and projecting the extracted descriptor vector so as to compress the descriptor vector into a dimensionality reduction descriptor vector; converting the dimensionality reduction descriptor vector into scalar values representing the likelihood that the sub-volume belongs to a health category, aggregating the scalar values at each visualization region, and estimating the membership of the health category; and detecting the existence of defects in the woven composite part according to the obtained membership estimated value of the health category of the visual region of the fault volume.

According to the preparation method of the woven preform based on resin powder filling, thermoplastic resin powder is heated to a semi-molten state through a resistance wire in the three-dimensional weaving process, so that the thermoplastic resin powder is attached to the surface of a yarn bundle, and hot-pressing curing can be directly carried out after the preform is formed; compared with the traditional process, the method has the advantages that the near-net forming advantage of the weaving process is reserved, the resin impregnation process can be avoided, the production efficiency is improved, the rapid forming is realized, the problems of non-uniform resin impregnation, large pore volume, glue shortage and the like caused by poor resin fluidity can be avoided, the quality of the woven composite material product is improved, and the mechanical property of the finished product is guaranteed.

METHOD FOR DETERMINING A WEAVE MAP One aspect of the invention relates to a method for determining a weave map of an area of ​​a part to be manufactured in a woven composite material, comprising: receiving a representation of said area of ​​the part; receiving predefined values ​​of parameters relating to manufacturing constraints of the area of ​​the part; determining, from the representation and a first subset of values ​​among the predefined values ​​received, a weave grid of the area of ​​the part, the weave grid comprising a plurality of cells; and successively determining, for each cell of the weave grid, a respective weave composition compatible with a second subset of values ​​among the predefined values ​​received. Figure to be published with the abstract: Figure 2

The application discloses a multi-scale three-dimensional woven composite cutting process simulation modeling method and device, and belongs to the technical field of woven material processing. The method comprises the following steps: establishing a volume unit model according to the carbon content of a fiber woven composite material at a microscale; establishing a space model according to the weaving structure of the fiber woven composite material at a macroscale; adding material properties of a matrix material and fiber tows; adding a periodic boundary condition to the volume unit model to obtain fiber material parameters; taking the material parameters as material parameters of the fiber tows in the space model; establishing a machining included angle model of a tool and the fiber tows at the microscale; establishing a cutting simulation model at the macroscale based on the space model; and adding a contact relationship between the tool and the fiber composite material. The method can accurately describe the coupling relationship between a micro material removal mechanism and a macroscale structural damage evolution by means of the unit model at the microscale and the space model at the macroscale, and provides theoretical guidance for precision machining parameter optimization.

The invention discloses a preparation method of a three-dimensional woven wing leading edge prefabricated body based on parametric modeling, a wing leading edge three-dimensional woven composite material and a preparation method thereof, and relates to the field of aircraft structure design. Based on wing design parameters, a parametric geometric model of the outer surface of a wing is constructed; based on the unit normal vector of the parameterized geometric model, the parameterized geometric model is biased in the normal direction, and an initial wing leading edge core model geometric model is obtained; the wing leading edge area of the initial wing leading edge core model geometric model is symmetrical along a symmetry plane, smooth transition is carried out, and a closed wing leading edge core model geometric model is formed; manufacturing a closed mandrel according to the closed wing leading edge mandrel geometric model; and performing three-dimensional weaving around the closed core mold, and then performing demolding and cutting in sequence to obtain the three-dimensional woven wing leading edge preform. The method is suitable for the wing leading edge with the variable cross-section characteristic, errors generated by relying on manual drawing and empirical modeling can be avoided, and the forming precision of the wing leading edge skin is improved.

The invention provides a complex special-shaped rubber-based flexible woven composite material film and a forming device and method, and belongs to the technical field of high-performance composite materials. Comprising an inner rubber layer, an outer rubber layer and a braid layer, the outer rubber layer is a complex special-shaped surface, the braid layer is located between the inner rubber layer and the outer rubber layer, and the inner rubber layer and the outer rubber layer are integrally formed on the two sides of the braid layer through hot pressing vulcanization by unvulcanized rubber. The composite material membrane not only has unique extreme environment resistance, but also can greatly improve deformation resistance and pressure resistance, and can meet the requirements in various complex industrial environments.

A machine and method are presented for continuously forming a woven composite with controllable internal fabric geometry. The machine may include one or more spools for dispensing one or more warp filaments, a roller assembly configured to receive a composite weave, a warp rack having warp heads for engaging the warp filaments and vertically adjusting position to dynamically create a weave pattern in response to the insertion of one or more weft filaments by a weft inserter stack.

The present invention relates to a method for non-destructive testing of a woven composite part whose tomographic volume has been previously acquired and divided into viewing areas, characterized in that it comprises the following steps of cutting the viewing areas of the tomographic volume into three-dimensional sub-volumes; extraction of a descriptor vector and projection of the extracted descriptor vector so as to condense the descriptor vector into a reduced descriptor vector; conversion of the reduced descriptor vector into a scalar value representing a likelihood of the sub-volume belonging to a sound class, aggregation of the scalar values ​​in each of the viewing areas and estimation of the membership of the sound class; and checking for the presence of defects on the woven composite part, according to the estimates of the membership of the viewing areas of the tomographic volume thus obtained.Figure for the summary: Fig. 2.

The invention discloses a knitted composite material yarn segmentation method based on semantic segmentation and contour extraction, and belongs to the field of composite material image processing. The implementation method comprises the following steps: preprocessing original CT slice data of the woven composite material to generate a target data set; based on the UNET network, carrying out cross-layer dense jump connection on the sampling result of each network layer in the UNET network to generate a UNET + + network structure; modifying the standard convolution in the down-sampling stage into a multi-receptive-field feature perception module (MFPM) to construct an MFPM-UNET + + network; training and verifying the MFPM-UNET + + network by using an adaptive loss function based on the training set and the verification set; inputting the test set into a trained MFPM-UNET + + network, marking pixels of which the category is yarn as white by adopting binarization processing according to a classification result of the network, and generating a yarn identification result graph of the target area; and on the basis of the yarn identification result graph, the outlines of the abnormally adhered yarns are separated by using a refined outline extraction strategy, so that the yarn segmentation of the woven composite material is realized.

The present application provides a method and device for identifying the microstructure of a 2.5-dimensional woven composite material based on machine vision. The method provided by the present application includes: identifying the target woven composite material based on the top view and the structural tensor information identification method of the target woven composite material to obtain a first material classification result; determining the pixel range of the warp and weft yarns of the target woven composite material from the main view based on the first material classification result of the top view, and determining the number of pixels in each independent area based on the pixel range, thereby optimizing the first material classification result and obtaining a second material classification result; obtaining a third material classification result based on the main view recognition result and the side view recognition of the overlapping warp yarns, and combining the second material classification result and the third material classification result to obtain the recognition result of the microstructure of the target woven composite material. The method and device provided by the present application are used to accurately and efficiently identify the microstructure of woven composite materials.

The present invention discloses a three-dimensional woven composite carbon-based skateboard and a preparation method thereof. The preparation method comprises weaving carbon fibers and copper wires into a composite three-dimensional braided body having a porous cross-section through a three-dimensional braiding process, filling the pores with a mixture of graphite powder and copper powder or copper-plated graphite powder to prepare a preform, and subjecting the heat-treated preform to chemical vapor deposition, resin impregnation and curing, carbonization, and heat treatment to obtain a three-dimensional woven composite carbon-based skateboard. The three-dimensional woven composite carbon-based skateboard of the present invention has relatively higher mechanical properties, high electrical conductivity, low resistivity, and high wear resistance, and can be better applied to rail transit vehicles as a pantograph skateboard material.

This invention discloses a method for calculating the thermal conductivity of woven composite materials based on real material information, comprising the following steps: performing Micro-CT scanning on the woven composite material to obtain slice images; processing the slice images to obtain the real material information of the woven composite material; establishing a representative volume element geometric model based on the weaving parameters of the woven composite material; dividing the representative volume element into regions and matching the thermal conductivity calculation model according to the region characteristics; inputting the real material information into the thermal conductivity calculation model, replacing the material partitions in the representative volume element with the real material partitions, calculating the thermal conductivity of each region, and then determining the overall thermal conductivity calculation model and calculating the overall thermal conductivity based on the thermal conductivity and arrangement of each region. Using the above method, the accuracy of predicting the thermal conductivity of woven composite materials is improved, the design and optimization accuracy and efficiency of woven composite materials are enhanced, and the design cycle and design cost are significantly reduced.

The application belongs to the technical field of helicopter structure components, and discloses a three-dimensional woven composite material pull-torque strip structure, which comprises at least two layers of three-dimensionally woven pull-torque strips, a gauze and a bushing, the pull-torque strips are fixed by overlapping with the gauze in between, both ends of the pull-torque strips are provided with connecting holes, and the bushing is arranged in the connecting holes; wherein the pull-torque strips are made of composite material made by three-dimensional weaving process, and fiber yarns are distributed in a direction different from the surrounding direction of the pull-torque strips. The three-dimensional woven composite material pull-torque strip structure can effectively improve the tensile capacity, enhance the anti-delamination capacity under torsional deformation, and thus prolong the service life of the pull-torque strip. The typical section and the connecting section of the pull-torque strip are connected through a slow transition area with a size gradually decreasing from large to small, so that the warping normal stress of the connecting section of the pull-torque strip is reduced, and the warping normal stress is reduced by 20% to 30% under a unit torsional angle.