75 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 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 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".

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.

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.

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.

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.

This application provides an RTM mold and a method for forming braided composite ducted fan blades, belonging to the field of composite material molding technology. It includes an upper mold, a lower mold, a left mold, and a right mold. The upper mold is located directly above the lower mold. The left and right molds are installed opposite each other between the upper and lower molds through insertion openings. The inner surfaces of the upper and lower molds, the left and right molds cooperate to form a cavity to accommodate the braided composite material preform. The RTM mold provided in this application enables efficient, high-precision, and low-defect forming of complex irregular-shaped composite materials.

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.

A mesoscopic unit cell analysis method for bending mechanical behaviors of a three-dimensional braided composite material relates to the field of mechanical property analysis, and comprises the following steps: obtaining mesoscopic characteristics and geometric parameters of a material, and establishing a mesoscopic unit cell finite element model with in-plane periodicity and thickness consistent with that of a sample; the method comprises the following steps: enabling a four-point bending sample to be equivalent to an in-plane periodically distributed thin plate structure, establishing association between macroscopic thin plate deformation and mesoscopic unit cell deformation based on a homogenization method, and deducing periodic boundary conditions; applying a boundary condition on the mesoscopic unit cell finite element model to simulate a mesoscopic mechanical response under a four-point bending load; and macroscopic bending performance parameters are obtained through microcosmic stress field homogenization treatment. According to the method, the in-plane periodic mesoscopic unit cell finite element model with the thickness consistent with that of the sample is established, the periodic boundary condition and the homogenization method are combined, macroscopic thin plate deformation and unit cell mesoscopic response are associated, and the applicability problem caused by non-periodicity of a traditional unit cell model in the thickness direction under the bending load is solved.

The invention provides an aramid fiber woven pultrusion composite material forming device and method, and relates to the technical field of composite material forming. Comprising a knitting machine, a high-temperature heating box, an infiltration box, an extrusion die, a curing assembly and a traction assembly. And the constant-temperature heating temperature of the high-temperature heating box is 150-300 DEG C. According to the device, through a simple high-temperature treatment process, the transverse performance of the aramid fiber woven composite material is remarkably improved.

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.