180 results about "Braided composite" patented technology

A prosthesis for transluminal implantation consists of a flexible tubular interbraided structure of metal or polymeric monofilaments, and polymeric multifilament yarns. The prosthesis can be elastically deformed to reduce its diameter through axial elongation. The monofilaments and multifilament yarns are arranged in axially spaced apart helices, concentric on a common central axis of the prosthesis. The monofilaments are selectively shaped before their interbraiding with the multifilament yarns, either by an age-hardening or other heat-setting stage, or a cold-working stage that controllably plastically deforms the strands. The shaped structural strands cooperate to impart to the prosthesis its nominal shape and resilience. The textile strands cooperate to provide a sheeting that occupies interstices between adjacent structural strands, to reduce permeability and thereby enhance the utility of the prosthesis as a vascular graft. An alternative embodiment prosthesis includes elastically and plastically deformable structural strands, selectively plastically deformed by cold-working then interbraided to form the prosthesis.

The invention relates to an electromagnetic shielding compound material made from three-dimensional braided nickel-plated carbon fiber and epoxy resin and a method for preparing same. The method comprises the following steps: carbon fiber surface treatment, carbon fiber nickel-electroplating, nickel-plated carbon fiber three-dimensional braiding, and compound material preparation on the basis of RTM (resin transfer molding) method and electromagnetic shielding effectiveness test. In the invention, the nickel-plated carbon fiber/epoxy resin braided compound material is prepared through the following steps: plating the carbon fiber with nickel, the metal; carrying out three-dimensional four-directional braiding; and then, compounding the nickel-plated carbon fiber braid and the epoxy resin. Owing to the good conductivity of the carbon fiber braid and the nickel-plated layer and the ferromagnetism of the nickel-plated layer, the braided compound material has good electromagnetic shielding performance. According to the test results based on the flange co-axial method, the electromagnetic shielding level of the braided compound material reaches 70dB to 80dB.

The invention relates to a three-dimensional braided carbon fiber reinforced polyetheretherketone composite material and a preparation method thereof. Carbon fiber reinforced polyetheretherketone fiber, and carbon fiber which is used as the raw material and accounts for 18-54% by volume, are mixed and braided in a three-dimensional five-direction mode to obtain the three-dimensional braided carbon fiber reinforced polyetheretherketone composite material. The three-dimensional braided carbon fiber reinforced polyetheretherketone composite material is prepared from fibers by a braiding and hot compaction combined technique. The technological process comprises the following steps: carrying out three-dimensional mixing and braiding on the polyetheretherketone fiber and carbon fiber, carrying out solution oxidation pretreatment on the mixed fabric, repeatedly flushing with distilled water, drying, putting the mixed fabric into a die, and carrying out hot compaction. The invention can effectively overcome the difficulties in the preparation of the three-dimensional braided composite material due to the thermoplastic property of the polyetheretherketone, thereby obtaining the three-dimensional braided carbon fiber reinforced polyetheretherketone composite material which has the advantages of sufficient fiber immersion and excellent mechanical properties.

The invention discloses a three-dimensionally braided pressure gas bottle and a preparation method thereof. The pressure gas bottle comprises a metal liner layer, a medium inlet/outlet and a three-dimensionally braided composite outer layer, wherein the medium inlet/outlet is formed at an opening in one end of the metal liner layer, and the medium inlet/outlet and the metal liner layer form an inner gas bottle layer, so that gas can enter and exit from the metal liner layer through the medium inlet/outlet; the three-dimensionally braided composite outer layer enwraps the inner gas bottle layer; the three-dimensionally braided composite outer layer is formed by repeatedly impregnating and compounding three-dimensionally braided three-dimensional fabric and resin; the three-dimensionally braided three-dimensional fabric sequentially comprises a three-dimensionally braided composite inner layer and a three-dimensionally braided composite surface layer from inside to outside; the three-dimensionally braided composite inner layer and the three-dimensionally braided composite surface layer are reinforced by seaming through a two-dimensionally seaming reinforcing structure. The pressure gas bottle is made of a novel mixed material, adopts a novel structure, can be adapted to different pressure-resistant environments, can be adapted to different application climate environments, and effectively solves a problem of pressure container damage caused by interlayer weakness.

The invention discloses an automobile plate spring of three-dimensional braided composite material and a preparation method thereof. The plate spring is of a three-dimensional fabric structure which is formed by combining and waving hybrid fibers, the material of fibers, the amount of tows and the structure of the fabric are adjusted to make the important part of the plate spring higher in strength and fatigue rigidity and longer in use durability, and simultaneously a resin vacuum transfer moulding technology is cooperated to uniformly soak, cure and shape the special composite resin, so as to obtain the heavy truck plate spring of three-dimensional braided composite material, the heavy truck plate spring is light in weight, strong in fatigue resistance, high in strength, rigidity and dimensional stability and relatively long in service life, and the problems of the common plate spring of two-dimensional laminated structure composite material such as interlayer fracture under fatigue loading condition are conquered.

A device for absorbing kinetic energy for an aircraft structural element undergoing a dynamic impact. The device includes an outer enclosure made from a braided composite material configured to preserve its integrity after an impact, a foam core, contained in the outer enclosure and to at least partially fill the outer enclosure. The foam core is configured to at least partially absorb the kinetic energy generated by the impact. Reinforcing elements are integrated at least partially into the foam core to dissipate, combined with the form core, the kinetic energy generated by the impact. The reinforcing elements includes discontinuous threads inserted into the foam core by stitching, and each discontinuous thread includes an L- or T-shaped head, folded down outside the outer enclosure.

By the present invention method and apparatus is disclosed whereby a triaxial braided composite reinforcing fabric having axial yarns of varying length may be wrapped about a cylindrical shipping spool without deformation of the braided fabric. A tensioning device is interposed between the braiding tool and shipping or storage spool whereby the individual variable length axial yarns are subjected to constant tensioning. As the braided fabric is wound upon a cylindrical shipping spool, a conformable foam layer is interposed between each layer of braided fabric thereby permitting each axial yarn to seek out its own diameter by compressing the layer of conformable foam upon which it is wrapped.

The invention discloses a three-dimensional braided composite material propeller blade of a ship and a manufacturing method thereof. A design of a core mode for supporting of a preform is conducted according to the requirement of marine power, and the design comprises determination of a blade main structure and specific strengthening part structures; according to the structure of the core mode and the strengthening design requirement, the category of a high performance fiber and a key characteristic of hybrid fiber yarn are determined, and the manufacturing of the hybrid fiber yarn is performed; the hybrid fiber yarn is adopted and the three-dimensional braided technology is applied to conduct continuous braiding forming of the propeller blade hybrid fiber preform; thermosetting resin adhesive glue solution is taken as a substrate, a vacuum infusion technology and a thermosetting process are adopted to conduct resin impregnation and vacuum solidification treatment on the hybrid fiber blade preform, and the three-dimensional braided propeller blade of the ship is obtained. The application of the three-dimensional braided structure and the combined process of the vacuum infusion and the thermosetting improve the strength of the propeller blade, and the production efficiency of the blade is effectively improved.

The invention relates to a forming device and a forming method for a tubular three-dimensional braided composite product. The forming device comprises a flexible core mold, an inward-contracting demolding device, a flexible RTM outer mold, a mold curing device and a medium circulation device, wherein the inward-contracting demolding device is arranged between the flexible RTM outer mold and the flexible core mold; the flexible curing device is arranged on the outer side of the flexible RTM outer mold; and the flexible core mold is connected with the medium circulation device. The forming device is applicable to forming of the tubular three-dimensional braided composite product; by adoption of the forming device, a curved tubular three-dimensional braided composite with various uniform interfaces and various irregular variable cross sections can be prepared; meanwhile, after preform fabric is subjected to braided molding, resin RTM impregnation and rapid curing molding can be performed continuously; and besides, the forming device has the function of quickly demolding the tubular three-dimensional braided composite product. Accordingly, the problem that a conventional metal or wood core mold is cumbersome in molding process, single in function and relatively low in production efficiency can be effectively solved.

A braided composite spar or preform for a braided composite spar, comprising a plurality of tubular plies of braided fibres, wherein the spar or preform has a centre line which extends lengthwise from a root to a tip, and at least part of the centre line follows a curved path which does not lie in a single plane. The spar or preform can be used to provide a tubular main spar for a winglet. The winglet also has a front spar with a front spar web, an upper front spar cap, and a lower front spar cap. An upper skin of the winglet is joined to the braided spar and the upper front spar cap. A lower skin of the winglet is joined to the braided spar and the lower front spar cap.

The invention relates to a self-adaption unit analyzing method for performance of a three-dimensional woven compound material. The self-adaption unit analyzing method comprises the following steps of: 1) defining a unit of a three-dimensional woven compound material with an abnormal section, namely a self-adaption unit; 2) equalizing the self-adaption unit to be a cuboid unit; 3) determining the volume percentage composition of whole fibers of the three-dimensional woven compound material with the abnormal section based on a self-adaption unit method; and 4) analyzing the elastic performance of the three-dimensional woven compound material with the abnormal section based on the self-adaption unit method. Aiming at the gradient of the performance of the three-dimensional woven compound material with the abnormal section, the invention provides the self-adaption unit capable of accurately predicating the performance and an equal method for accurately predicating the performance; and the invention provides a step length control method for digitally describing the performance, namely a model calculation precision can be improved through thinning step lengths of different coordinate directions. Compared with a predication model based on a single-cell method, the self-adaption unit analyzing method has the advantages that the problem of predicating the performance of the three-dimensional woven compound material with a complicated geometrical shape is effectively solved and the predication precision is higher.

The invention relates to a forming process of a resin-based three-dimensional braided composite material. The forming process comprises the following steps of (1) preparing prefabricated elements; (2) preparing a mold; (3), assembling the mold; (4) preparing resin; (5) injecting glue; (6) curing; and (7) opening the mold. The forming process of the resin-based three-dimensional braided composite material has the characteristics of low energy consumption, less environment pollution, accurate product size, good surface quality, high stability, high finished product rate, and capability of forming products with complex shapes. The mold manufacture and material selection are high in flexibility, and complex constructional elements with favorable surface quality and high dimension accuracy can be manufactured; the fiber volume of the composite material is high; the composite material product is low in porosity; the formed three-dimensional braided composite material generally is not required to be subjected to mechanical processing, and therefore, not only is the additional expense reduced, but also the fiber damage caused by post processing is also prevented. The forming process of the resin-based three-dimensional braided composite material is widely applied to the fields of aerospace, national defense, war industry, traffic transportation, buildings, civil industry and the like.

A device for absorbing kinetic energy for an aircraft structural element undergoing a dynamic impact. The device includes an outer enclosure made from a braided composite material configured to preserve its integrity after an impact, and a foam core contained in the outer enclosure and to at least partially fill the outer enclosure. The foam core configured to at least partially absorb the kinetic energy generated by the impact. Reinforcing elements include at least one dry composite fiber preform integrated into the foam core to dissipate, in combination with the foam core, the kinetic energy generated by the impact. A method for integrating the device for absorbing kinetic energy.

The invention discloses a three-dimensional braided composite material propeller blade for an airplane and a manufacturing method of the propeller blade. The preparation method comprises the following steps: designing the blade mold appearance, comprising the operation of designing the specific reinforcing parts of different strength and rigidity requirements; performing integral braiding on the blade main body and the specific reinforcing parts of the blades by adopting a carbon fiber three-dimensional preform multi-part combined braiding technology, thereby obtaining a three-dimensional braided structure; performing secondary suture reinforcement treatment along the thickness direction of the three-dimensional braided structure after the preparation of the three-dimensional braided structure is finished, thereby obtaining a secondary suture structure; by taking thermosetting resin glue liquid as a matrix, finishing the resin compounding process of the three-dimensional stereoscopic braided structure by adopting the process of combining vacuum infusion and rapid thermocuring, and finally, manufacturing the carbon fiber composite material propeller blade. By utilizing the multiple three-dimensional stereoscopic braided structures, the secondary suture technology and the process of combining vacuum infusion and rapid thermocuring, the strength of the propeller blade is enhanced, and the production efficiency of the blade is effectively improved.

A braided composite spar or preform for a braided composite spar, comprising a plurality of tubular plies of braided fibres, wherein the spar or preform extends lengthwise from a root to a tip, and the spar or preform has a tapered portion in which each ply has a height which reduces and a width which increases as it extends toward the tip. The spar or preform can be used to provide a tubular main spar for a winglet. The winglet also has a front spar with a front spar web, an upper front spar cap, and a lower front spar cap. An upper skin of the winglet is joined to the braided spar and the upper front spar cap. A lower skin of the winglet is joined to the braided spar and the lower front spar cap.

The present invention provides a carbon fiber composite material bone fracture plate and a preparation method thereof. The bone fracture plate is composed of a continuous carbon fiber braided composite material layer and a carbon fiber nonwoven fabric composite material layer in a superposed manner; carbon fibers between the continuous carbon fiber braided composite material layer and the carbon fiber nonwoven fabric composite material layer are filled with a silicon carbide matrix or a silicon carbide-carbon matrix and hydroxyapatite. The composite material has characteristics of light weight, good biocompatibility, good chemical stability, mechanical properties close to human body bones, good fatigue, strong designability, no artifacts, etc., and besides, surface pores and surfaces are stably adhered with the hydroxyapatite which can improve biological activity of the composite material, promotes bone growth and induces bone proliferation.

The invention relates to a composite material manufactured by three-dimensionally braiding preimpregnated continuous fibers and a method thereof. The method comprises the following steps: first, impregnating a continuous fiber bundle in thermosetting resin to obtain a preimpregnated continuous fiber bundle; then weaving a blank piece on the outer surface of a rubber mandrel by using a three-dimensional braiding machine; and finally, putting the rubber mandrel and the blank in a closed metal outer mold, integrally heating the inner and outer molds and rotating the inner and outer molds slowly along the axial direction of the mandrel in the heating process to cure a composite material so as to prepare a high quality resin-based continuous fiber composite material product, resin of which is distributed uniformly. The method overturns a flow of weaving and injecting glue successively in a conventional three-dimensionally braided composite material manufacturing process. By impregnating thefibers and the resin fully, the resin content and the resin distributing uniformity are controlled better and the resin and the fibers are fully impregnated through three-dimensional braiding and curing processes, so that the high performance continuous fiber composite material which is excellent in mechanical property, good in cold and hot circulating stability and low in coefficient of thermalexpansion is prepared.