45 results about "Braided composite" patented technology

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.

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".

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.

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.

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.

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.

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

The invention relates to the technical field of power cables, and provides an insulated power cable which comprises a conductor layer. The outer side of the conductor layer is provided with a buffer shielding layer, an insulation layer, an insulation shielding layer, a braiding enhancement layer, a buffer repairing layer and a sheath layer in a layer-by-layer manner. The conductor layer comprises a reinforcing core, a first conductor on the outer side of the reinforcing core and a second conductor on the outermost circle, and the section of the second conductor is trapezoidal. The woven reinforcing layer comprises an inner woven composite layer on the inner side and an outer woven layer on the outer side, and anchoring units are fixedly arranged at the intersection points of the inner woven composite layer and the outer woven layer; the buffer repairing layer comprises a metal corrugated framework and a flexible coating on the inner side of the metal corrugated framework. A contact surface is increased through a trapezoidal structure of a conductor II, a heat dissipation channel is formed by cooperating with an anchoring unit, external impact force can be quickly dispersed by utilizing composite weaving and cross point anchoring of an inner weaving composite layer and an outer weaving layer, meanwhile, the resistance to external force is enhanced by utilizing a buffer repairing layer, and defect gaps can be automatically filled through repairing microcapsules.

The application discloses a kind of variable-thickness curved surface weaving ceramic matrix composite three-dimensional reconstruction methods, belong to the field of microstructure identification and reconstruction.The application can quickly and accurately calculate the area of each cross section of the composite material by identifying the outer edge of the curved surface weaving composite material combined with the area of a single pixel;Meanwhile, by deleting the surface fibers arranged complexly, the classification accuracy of internal warp and weft can be improved, and it is more effective for subsequent reduction of human participation;By processing the three views of XCT data of the composite material respectively, the pore position can be accurately extracted from the original XCT image, the fiber bundles in different slices are numbered from the overhead view and the side view through the number of fiber columns and the spatial position relationship, and the spatial paths of warp yarns and weft yarns are respectively fitted, the fiber bundle cross section is represented by oblique elliptic function, the three-dimensional model reconstruction of curved surface weaving CMC can be quickly realized, the algorithm is practical, and the whole process is simple to operate.

The application discloses a kind of high flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and preparation method thereof, belong to cable manufacturing technical field, from inside to outside include optical fiber unit, conductor layer, insulating layer, shielding layer, anticorrosive layer and sheath layer in sequence.Optical fiber unit uses ceramicized silicone rubber buffer layer;Conductor layer is nickel-plated copper alloy stranded wire, and oxidation resistance is enhanced by nano titanium dioxide sol treatment;Insulating layer is three-layer co-extrusion structure;Shielding layer uses aluminum-plastic composite tape and plated tin copper wire braided composite structure;Anticorrosive layer is polytetrafluoroethylene film treated by plasma;Sheath layer uses two-component ceramicized silicone rubber, and it is flexible at room temperature vulcanization, and it is converted into ceramic body at high temperature.The application realizes excellent continuous use stability, strong corrosion resistance in salt spray environment and other performances through the synergistic design of multilayer structure, is suitable for high temperature, corrosion, fire and other harsh environments, significantly improves the safety and durability of composite cable.

The application discloses a transmission device of a modular braiding device, comprising a corner wheel movement unit, a gear set transmission unit and a gasket; the gear set transmission unit comprises symmetrically arranged motor gears, an adjustable gear, a driving gear and a plurality of auxiliary gears arranged in rows. Compared with the prior art, the application compensates the gear meshing gap by increasing or decreasing the number of gaskets; the symmetric double motor, the adjustable gear transmission chain and the modular gear row are cooperatively designed, so that the transmission device has the advantages of high synchronization precision, flexible expansion, convenient maintenance and reliable operation, and is suitable for the preparation of high-performance three-dimensional braided composite material preforms.

A tracer strand for the weaving of a composite material part reinforcement, the tracer strand including one or more carbon yarns twisted with one or more yarns of a material having a color contrasting with the color of the carbon yarns, the yarns being twisted together according to a twist included between 10 turns per meter and 80 turns per meter.

The application belongs to the technical field of sports equipment, and particularly relates to an anti-fatigue badminton racket rod based on three-dimensional woven composite material and a manufacturing method, which comprises a net frame, a racket rod and a handle connected in sequence, and the net frame, the racket rod and the handle are integrally formed into a continuous whole member by three-dimensional woven composite material; the three-dimensional woven composite material comprises a reinforcing body and a matrix, the reinforcing body is a carbon fiber three-dimensional woven preform, and the matrix is modified epoxy resin; the fiber volume content of the racket rod is 55%-65%, the application constructs a fiber space interlocking network through a four-way weaving structure, eliminates interlayer interfaces and splicing stress concentration in combination with an integrated forming process, and improves the anti-fatigue performance, anti-torsion stiffness and interlayer bonding strength of the racket rod; through optimization of the fiber volume content and a stepped curing process, the best balance of strength, formability and fatigue life is achieved, and the technical problems of easy delamination, poor anti-fatigue performance and low connection reliability of a traditional laminated material badminton racket rod are solved.

The application provides a woven preform preparation method based on resin powder filling. In a three-dimensional weaving process, a hot plastic resin powder is heated to a semi-melted state by a resistance wire, so that the hot plastic resin powder is attached to the surface of a yarn bundle. After the preform is formed, hot pressing and curing can be directly performed. Compared with a traditional process, the resin impregnation process can be avoided, the production efficiency is improved, rapid forming is realized, the problems of uneven resin impregnation, large porosity and lack of glue caused by poor resin fluidity are avoided, the product quality of the woven composite material is improved, and the mechanical properties of the finished product are ensured.

A method uses a calibration panel to calibrate a scanning system that detects defects in a woven composite part. The method includes the steps of providing a calibration panel having a woven composite panel and at least one insert positioned within a thickness of the woven composite panel. The method further includes the steps of scanning the calibration panel and comparing results of the scanning of the calibration panel with baseline data for the calibration panel. The method also includes the step of adjusting scan parameters if differences between results of the scanning of the calibration panel and baseline data for the calibration panel are greater than acceptable limits.

A composite tip and trailing edge reinforcement wrap for a composite fan blade including a non-woven composite main body forming an airfoil portion above a flow path and a tip adjacent the airfoil portion opposite a root portion; the airfoil portion defines a blade chord between a leading edge and a trailing edge, a concave pressure side and a convex suction side defined between the leading edge and the trailing edge, a blade span between the root portion and the tip; a metallic sheath attached to a main body outer surface proximate the leading edge; the composite tip and trailing edge reinforcement wrap attached to the main body outer surface located from the trailing edge and extends across the airfoil portion chordwise from the trailing edge to portions of the metallic sheath and extends spanwise from the tip along the airfoil portion to a predetermined distance of the blade span.

A method uses a calibration panel to calibrate a scanning system that detects defects in a woven composite part. The method includes the steps of providing a calibration panel having a woven composite panel and at least one insert positioned within a thickness of the woven composite panel. The method further includes the steps of scanning the calibration panel and comparing results of the scanning of the calibration panel with baseline data for the calibration panel. The method also includes the step of adjusting scan parameters if differences between results of the scanning of the calibration panel and baseline data for the calibration panel are greater than acceptable limits.

The application discloses a kind of three-dimensional woven composite macro-mesoscopic mechanical property parameter prediction method, based on the internal real weaving structure of three-dimensional four-way woven composite material, the whole material is divided into surface area and internal area, and the periodic cell finite element model of two kinds of areas is respectively established, the nonlinear mechanical behavior characteristics of matrix material and yarn material are considered to carry out the explicit dynamics calculation of cell under different strain rates, to predict the mechanical property parameters of different regions of composite material under different strain rates, the strain rate strengthening parameter is obtained by curve fitting the mechanical property parameters under each strain rate.The mechanical property parameters of surface cell and internal cell area calculated by mesoscopic scale are respectively substituted into the surface cell area and internal cell area of macroscopic finite element model, so that high strain rate condition calculation such as ballistic impact, bird impact, ice impact and other impact dynamics related can be carried out.

The invention belongs to the technical field of additive manufacturing and weaving technology crossing, and relates to an additive-weaving composite manufacturing device and method based on laser space solidification, the additive-weaving composite manufacturing device comprises an additive weaving assembly, an industrial mechanical arm and multiple sets of parallel ground rails, and the additive weaving assembly comprises a clamping unit, a rotary body core mold, a wire feeding ring and a laser air cooling solidification assembly; the clamping units are arranged on the group of ground rails in pairs and are used for clamping and driving the revolving body core mold to rotate around; the wire feeding ring and the laser air-cooling curing assembly are coaxially arranged on the rotary body core mold in a sleeving mode, and the two industrial mechanical arms are connected with the wire feeding ring and the laser air-cooling curing assembly correspondingly. And when the clamping unit drives the rotary body core mold to continuously rotate, the industrial mechanical arm drives the wire feeding ring and the laser air cooling curing assembly to translate in the axial direction, so that the reinforced composite wire is cured and cooled while being spirally wound on the surface of the rotary body core mold. According to the manufacturing method, integrated, continuous and automatic manufacturing of the fiber composite material rotary body part is achieved, and the manufacturing efficiency is improved.

The present application relates to a kind of fiber preform cross section image segmentation method, first to the woven composite material physical object CT scanning is carried out, to obtain warp and weft cross section information;Then a certain amount of CT image is selected to make neural network training data set, train deep convolutional neural network to be used for the yarn cross section in CT image segmentation;Again, the yarn cross section after neural network segmentation is identified, and the cross section that occurs overlap is found and cross section classification is carried out;Finally, the overlapping region of overlapping cross section is segmented.The present application is high in segmentation efficiency, and segmentation speed is fast, need not image to have higher resolution and contrast, and the present application uses a variety of yarn separation algorithm to be combined, can be well to overlapping yarn cross section separation, effectively reduces the artificial and time cost before data pre-processing before modeling, and provides convenience for subsequent parameterized modeling.

The invention 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. According to the method, representative volume element models with specific weaving angles and fiber volume fractions are established according to different spatial positions of the coupler; the macroscopic equivalent elastic modulus and strength of each position are obtained through finite element analysis and a volume averaging method; establishing a coupler macroscopic finite element model, endowing the model with equivalent performance parameters, and analyzing a failure index and an inherent frequency of the model under a design load; and by taking mass minimization as a target and the failure index and the inherent frequency as constraints, constructing an optimization model, and iteratively adjusting a weaving angle, a volume fraction and a structural size through a heuristic algorithm, thereby realizing light weight and performance collaborative optimization of the coupler. According to the method, the design problem caused by multiple parameter freedom degrees and high multi-scale coupling performance of the three-dimensional braided coupling is solved, and an optimal design scheme meeting the requirements of complex working conditions can be efficiently and automatically obtained.

The invention provides a distributed graphene stress sensor and a preparation method thereof, and relates to the technical field of graphene stress sensors. The sensor comprises a flexible substrate; a plurality of pressure-sensitive graphene composite structure matrixes with damaged unrecoverable structures are arranged on the flexible substrate in an array mode, each graphene composite structure matrix is of a rectangular graphene stacking and weaving composite structure, and each graphene stacking and weaving composite structure is composed of woven graphene pipes. The graphene tube is formed by stacking graphene wafers; the two electrodes configured on any graphene composite structure substrate are respectively connected with a driving power supply through the two gates, the other two electrodes configured on any graphene composite structure substrate are respectively connected with the amplification circuits, and the two amplification circuits connected to the two electrodes are respectively connected with the signal acquisition circuit through the other two gates. The graphene composite structure matrix has the advantages of low resistance, high stress sensitivity and large deformation range.