Elongated composite structure

 

(57) Abstract:

Usage: to obtain a composite polymer materials. The inventive elongated composite structure consists of a polymeric matrix containing randomly torn carbon fibre, which is oriented relative to the longitudinal axis of the elongated composite structure in the transverse and neoperene directions, carbon fiber oriented in poperechnykh directions of the curved section, the curved toward the center in the direction defined by the radius of the curved section and the carbon fibers oriented in the transverse direction of the curved section, directed toward the center of the radius of curvature of the specified curvilinear plot. 27 ill.

The invention relates to molded materials with a polymer matrix reinforced with fibers, more specifically molded material, preserving the orientation of the fibers in the material relative to each other.

It is known that many of thermoplastic polymeric materials can be molded in different ways molding of metals, such as, for example, deep drawing, bending with stretching, punching, binding, etc. from the more high-strength, resistance to impact and dimensional stability. However, the known methods of molding polymeric materials containing fibers oriented in many directions, not allow to preserve the orientation of the fibers relative to each other during the molding structure. In many cases this leads to a reduced mechanical strength. One way of dealing with the problem in hand laying patterns being formed from discrete segments of the polymer material reinforced with fibers, and then curing laid oriented material in final form when controlling thereby the orientation of the fibers. Getting known composite structure consisting of a polymer matrix reinforced with fibers with different orientation, is time consuming and expensive process.

The technical problem solved by the invention is to reduce the complexity of composite material.

The problem is solved in that the polymer matrix consists of polyetherketoneketone (RECK), as a reinforcing fiber polymer matrix contains randomly torn carbon fibre, which is oriented relative to the longitudinal axis of the elongated the e in poperechnykh directions of the curved section, curved toward the center in the direction defined by the radius of the curved section and the carbon fibers oriented in the transverse direction of the curved section, directed toward the center of the radius of curvature of the specified curvilinear plot.

The product (the product) is defined as an elongated composite structure, formed on the specified path, which path has a curved section, each of these areas is determined by the radius of curvature relative to the center, and named structure includes a polymer matrix reinforced with fibers, with the fibers oriented relative to the longitudinal axis of the structure in the transverse and neoperene directions, the fibers oriented in poperechnykh directions of the curved section, the curved relative to the center of radius of the curved section and the fibers oriented in the transverse direction of the curved section, directed toward the center of the radius of curvature of this curved section.

The product may include several forms with different cross-sections, which can be classified according to the number of layered surfaces and compounds of these surfaces. For example, section L, C, O, Z or CIL be considered as having three layered surface with a single connection. Section I or H has four layered surface with two connections.

Appropriate thermoplastic polymeric materials that can be used as the polymer matrix include polyetherketoneketone. The selected polymer reinforced with carbon fibers.

For molding certain cross-sections of the inner area of the cross-sectional shape must be supported in the form of the element, which should be flexible in the longitudinal direction or the direction of the molding, but to remain tight in the reference direction, which is perpendicular to the longitudinal direction and can withstand the process conditions. In the preferred embodiment, the implementation of this form element is set steel bands.

In Fig. 1 schematically shows a device for molding fiber-reinforced resin material; Fig.2 schematically shows the format of the calculation of the path trajectory of the Cam device shown in Fig.1; Fig.3 shows a diagram of the system controlled by the computer to control the operation of the device for forming structures of polymer matrix reinforced with fibers; Fig.4-11 shows the stages of operation of the device according to Fig.1 the s bend straight the original structure before forming; in Fig.13-16 schematically depicted in terms of individual bends in Fig. 12 with the orientation of the fibers of Fig.17 shows a perspective view with a partial tear-out to show the individual bends forming the structure of Fig. 18-21 schematically illustrates the orientation of the fibers in different folds molded product in Fig. 17; Fig.23, 25-27 section a-a in Fig.1, representing respectively forming parts in cross section T, H, C, J, or O, and hollow molded parts; Fig.24 shows a view in plan with a tear-out corresponding to Fig.23, illustrating the structure of the underlying support element.

The preferred embodiment of the invention provides a method for forming the structure of the polymer matrix reinforced with fibers, as shown in Fig. 1, the device for implementing the method generally includes a frame 1, two end clamps 2 and 3 in opposite places on the frame, two pairs of guide lugs located at opposite locations (shown only one pair 4, 5), two hydraulic cylinders 6 and 7, pivotally connected between the frame and clamps, a set of tools 8-12 retention, attached to the frame. Each holding tool has the configuration sootvetstvenno holding tools 8-12. Shaped matrix that contains the basic tool 18, heated electric sectional heaters 19 (Fig.3) (the firm "Watlow electric manufacturing to" the heater from firing the cartridge A) attached to the frame 1, and the cap on the tool 20, which is connected with the hydraulic cylinder 21, which is mounted on the frame 1 to move away from and to the underlying instrument, are located between the end clamps 2 and 3. The initial line segment 22 is clamped each end of the clamps 2 and 3 and placed between the retaining tools 8-12 and basic tool 18.

In Fig. 2 shows that the trajectory of the guides 4, 5 Cam comes from the geometry of the final curved shape, which is necessary, as it is defined by the lower edge 23 of the final molded component of the segment. More specifically, when molded molded product according to the specified direction of many of the component pieces, each component segment is determined dependent variables S, x, y and independent variables L, R, D, and O, where x, y are the coordinates of the points that form the trajectory of the guides 4, Cam 5, L is the length nevorovannoe material, S is intermediate the length of the arc of one of the components is Noah arc S at its end point T, is the angular position of the coordinates of the tangent point So the Rest of the straight length equal to L minus s to correctly identify the shape of the guide Cam, it is necessary to determine the arc length S as having zero length, spaced at a uniform distance from the lower edge 23.

Coordinates x, y can be expressed as a function of the independent variables L, R, D and O, so that when S R (90-0)/ (150), then x R cos() + (L S)sin(0) + D cos();

y R sin() (L S) cos(0) + D sin().

In Fig.3 computer 24 (programmable logic controller series 515, model 1785-LT, company "Allen Bradley") is connected at its output terminals with a hydraulic controller 25 and a controller 26 of the heater. Hydraulic controller 25, in turn, is connected to the cylinders 6, 7, 13 to 17 and 21. The controller 26 of the heater is connected with sectional electric heater 19, located in the base of the tool 18. The inputs to the computer containing the sensors 27 and 28 position, located at the end clamps 2 and 3 for signalling when the hydraulic cylinders 6 and 7 stretch the original length of 22 to intermediate positions corresponding to the tangential points of the individual component lengths (lengths). Additional inputs to the computer are the sensors of 29-32 davleniyeni with the input of the controller 26 of the heater for detecting the temperature and signaling controller.

After placing the original cut (blank) 22, clamped in the clamps 2 and 3, begins the sequence of operations. Heat is provided by electric sectional heaters 19 via the controller 26 of the heater. Thermocouple 33 detects the temperature and sends a signal when the working temperature is reached. The computer sends a signal to the hydraulic controller 25 to start the operation of stretching, and the clamps 2 and 3 are moved in the guide rails 4, 5 by means of hydraulic cylinders 6, 7, which are connected to respective terminals for formation of the first component of the segment. When the position of the first component of the segment is reached, as detected by the sensor 27, 28, signals are sent to the computer 24, which sends a signal to the controller 25, to operate the cylinder 15, which moves holding the tool 10 relative to the source of the segment 22 to hold in place molded component segment. At the next stage in the program, the computer sends a signal to the hydraulic controller 25 to continue stretching until you have formed two adjacent component of the segment. When two adjacent component of the line segment formed at the second positions stretching, as again adenia cylinders 14, 16. They move their respective holding the instruments relative to the original cut, to keep in place these molded component segments. At the next stage in the program, the computer 24 sends a signal to the hydraulic controller 25 to continue stretching until you have formed two final component of the segment. When two final component of the segment reaches its end position, as this is reported to the sensors 27, 28, signals are sent to the computer 24, which sends signals to the controller 25 for excitation of the cylinder 13, 17. They move their respective holding the instruments relative to the original cut that kept molded component pieces in place. Upon excitation ultimate holding cylinder, the computer sends a signal to the hydraulic controller for excitation of the cylinder cap 21 of the tool in order to seal the end portion, to turn off the heaters and to initiate circulation of the cooling flow through the underlying instrument 18.

Stage molding is better shown in Fig.4-11. In Fig.4 shows the original installation source segment 22, is placed in a forming device without effort. The initial line segment danego used polymer, the original part is stretched to education a Central component of the segment (Fig.5) extending cylinders 6, 7, until the line becomes tangent to the arc at the end of the Central component of the segment. After this Central component is formed, the cylinder 15 is holding the tool expands to move the holding tool 10 for holding in place a component of the segment (Fig.6), when both are formed adjacent component sections (Fig.7) and held (Fig. 8). The final stretch takes place in relation to the remaining component of the segments (Fig.9), and then molded part (detail) compacted remaining holding tools 8, 12 (Fig.10) and the cap tool 20 (Fig.11).

It is evident from Fig.12-16 shows that the original piece 22 consists of a dome section 34, section partitions 35 and the filler 36. This specific product can be considered as having three layered surface with one connection and one filler 36. More specifically, these three-layer areas designated as positions 37, 38 and 34. The filler 36 is surrounded by a connection 39. Although described specifically in relation to section T, it also applies to laminated surfaces, connections IOUT wall, also form the lower part of the cap. The upper part of the cap is formed with additional bends. The plot of the cap and the portion of the septum is composed of a set of bends, each of which (bend) consists of a material of the polymer matrix reinforced with fibers, where the fibers in such a bend is oriented relative to the longitudinal axis in the transverse and neoperene directions. Fiber in neoperene direction randomly torn, while the fiber in the transverse direction neporvannye or chaotic torn. More specifically, the fibers 40 in the bend 41 is oriented at an angle of 45aboutto the longitudinal axis of the fiber 42 in bend 43 is oriented at an angle of 45aboutwith respect to the longitudinal axis of the fiber 44 in the bend 45 is oriented at an angle 0aboutrelative to the longitudinal axis and the fiber 46 in the bend 47 is oriented at an angle of 90aboutrelative to the longitudinal axis. Thus, fiber bends 41, 43 and 45 are oriented in poperechnykh directions, whereas the fibers bend 47 is oriented transversely relative to the longitudinal axis. This can more clearly be seen in Fig.13-16. The filler 36, consisting of fibers oriented at an angle 0aboutin direction relative to the longitudinal axis of the polymeric material matp is>In Fig.17-20 shows a segment produced by extrusion, where the bends 41, 43, 45 contain fibers 40, 42, 44, oriented in poperechnykh directions, which are curved relative to the center with a radius of curvature corresponding to the particular section of the composite structure, while the fibers 46, oriented in the transverse direction in the bend 47, directed toward the center of the radius of curvature for this particular plot. It should be noted that the fiber in Fig. 18-21 after molding remain oriented relative to each other and to the longitudinal axis of the structure and thus are in a predetermined position for the formation of optimal strength in a particular application. Although the preferred embodiment is described as a composite structure in the form of a T, this method can be used for molding parts, which have different structural forms.

In Fig.22, 23, 25-27 shows in cross section an alternative molded part together with the supporting elements where necessary. More specifically in Fig.22 shows a T-shaped cross-section, covered with aluminum shell 48 and held in place holding the tool 10 and the base tool 18. Similarly (Fig.23 H-shaped composite structure is thanks to this particular configuration of the support elements 50 are arranged in the inner parts of H-shaped cross-section. The supporting elements contain multiple stacked steel strips 51, as shown in Fig. 24. Steel strip 51 can move freely in the longitudinal direction one with respect to another. The structure of the supporting elements is the same in Fig. 25, 26 and 27, which show a C-shaped, J-shaped and O-shaped hollow configuration, held in place holding the tool 10 and the base tool 18. The supporting elements 50 are clamped at their ends to the terminals 2 and 3 as the source segments 49, 22, 52, 53 and 54.

In the preferred embodiment, the implementation of the supporting element 50 is described as a set (stack) steel strips. Although the steel strip is preferred, due to their flexibility in the direction of the molding or the longitudinal direction in conjunction with the stiffness in the reference areas, which are normally perpendicular to the longitudinal direction, for this purpose can be used and the other supporting element that meets the above criteria.

The invention is illustrated by the following examples.

P R I m e R 1. Straight flat strip AS4 graphite fibers in polyester kyonkyon (RECK thermoplastic resin) was formed in flat contour with an inner radius of 47 inches (1193,8 mm). The volume of filaments which you performed with an electric cartridge heating elements and channels air cooling. The instruments had a length of 9 inches (228.6 mm) and was given a six-inch (152,4 mm) forming region. The part was clamped in place and was heated up to 700aboutF (371,1oC). The input and output edges had a temperature of less than 550aboutF (287,8oC). After forming the item was re-aterials at 500 psi (3447,38 kPa). Were formed by three adjacent segment, and the final item had smooth transitions between these segments.

P R I m m e R 2. Sorokulova part (1013 mm) fifty-five inches (1397 mm) smooth Z-section AS4 graphite fibers in RECK thermoplastic resin formed in part with an input angle of 20aboutwith a constant radius of 6 feet (1828,8 mm). The amount of fibers was 60% of the fibers were intermittent and oriented in the directions of 0.90 and 45about. Steel tools parts with electric cartridge heating elements and channels air cooling. The tools were 17 inches length (431.8 mm), and in each cycle was formulas 10aboutarc section. Item pinched in place and was heated up to 700aboutF (371,1aboutC). The input and output edges had a temperature of less than 500aboutF (287,8oC). After molding, the item was re-utverjdali at 600 pSi (4136,856 kPa). It was formed by three neighboring the ATTRIBUTES STRUCTURE, consisting of a polymer matrix reinforced with fibers with different orientations, wherein the polymer matrix is made of polyetherketoneketone, as a reinforcing fiber polymer matrix contains randomly torn carbon fibre, which is oriented relative to the longitudinal axis of the elongated composite structure in the transverse and neoperene directions, carbon fiber oriented in poperechnykh directions of the curved section, the curved toward the center in the direction defined by the radius of the curved section and the carbon fibers oriented in the transverse direction of the curved section, directed toward the center of the radius of curvature of the specified curvilinear plot.

 

Same patents:

The invention relates to chemical engineering and can be used in capacitive equipment in contact with corrosive environments of various chemical, petrochemical, electronic, textile and related industries

FIELD: technological processes.

SUBSTANCE: proposal is given of a sheet with at least, two monolayers, each of which contains unidirectional oriented fibres, binding substance and parting film with porosity of 40-90% on both outer surfaces. The unidirectional oriented fibres in the monolayer have breaking stress of approximately 1.2GPa, and Young's modulus of at least 40 GPa. The direction of fibres in each monolayer is opposite the direction of fibres in the adjacent monolayer. The invention also pertains to assembling of at least, two such sheets and a flexible object, resistant to ballistic effects, with such a structure.

EFFECT: increased ballistic stability.

11 cl, 1 tbl, 3 ex

FIELD: engineering procedures.

SUBSTANCE: one version of the method consists that the cloth is placed on porous substrate movable on the straight or rotating about the axis. At least one side of the cloth is processed with some water jets rowed perpendicularly to cloth moving direction. Herewith a row is formed with one-section jets and at least other section jets different from the first one.

EFFECT: improved surface properties of the product.

33 cl, 17 dwg

FIELD: roof.

SUBSTANCE: invention is related to roll roofing materials. Roll roofing material contains upper protective layer, substrate and polymer reinforcing mesh arranged in between. Protective layer is made of composition that consists of polyvinyl chloride, dioctyl phthalate, chalk, titanium dioxide and thermal stabilisers. Substrate is made of composition made of polyvinyl chloride, dioctyl phthalate, chalk, thermal stabilisers and wastes of roll roofing material production.

EFFECT: invention provides for lower level of linear dimensions variation in process of material heating and high quality of material with increase of its thickness.

2 ex

FIELD: textile, paper.

SUBSTANCE: stock comprises a central part with interwoven layers, the first and second end parts with independent woven layers. Layers of the independent woven layers pass along whole length of the stock in the central part to form a 3D woven structure. The layers are woven independently from each other in the end parts to form a pile of woven fabrics. Diagonal layers are added between independent woven layers in the first and second end parts. The 3D composite structure reinforced with a woven stock comprises a central part, the first and second end parts, and also a binding material.

EFFECT: invention provides for the possibility of the structure to perceive high concentrated loads.

22 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly to production of structural parts from composite materials. Window composite ring with multilayer reinforcing material has ring-shape closed contour and nonstandard profile. It comprises inner and outer flanges and ribs made from laid textile reinforcing materials bent from flange into rib and embedded into stiff polymer binder. Ring layers are made up of braided and woven hose-shaped clothes with diagonal braiding of threads. Layering is performed by horse-shaped cloth bending over inner and outer edges of flanges and rib so that every next layer makes an extension of previous layer to allow a smooth continuous seamless transition of layers from flanges to rib and vice versa.

EFFECT: lower labour input and costs.

16 cl, 21 dwg

FIELD: chemistry.

SUBSTANCE: carbon fibre reinforcement frame for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, for example, for the tip of a rocket head, comprises a central unidirectional cylindrical bundle of a given diameter made of carbon fibre bonded with binder - aqueous polyvinyl alcohol solution, on which, like an arbour, a cocoon of carbon fibre is wound by honeycomb winding. The workpiece for making a reinforcement frame of carbon fibre is in the form of a unidirectional cylindrical bundle of a given diameter arranged centrally along an axis and made of carbon fibre which is bonded with aqueous polyvinyl alcohol, on which, at a distance equal to the height of a workpiece of the tip of a rocket head by ring winding, polar barriers are applied in the form of a spherical surface made of carbon fibre soaked with the binder - aqueous polyvinyl alcohol solution. The method of making a reinforcement frame from carbon fibre for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, is carried out in the following sequence: winding a cocoon of carbon fibre soaked with aqueous polyvinyl alcohol on a workpiece, having a bundle of unidirectional carbon fibre with two polar barriers by honeycomb winding, as on an arbour. After drying the frame and cutting off the ends of the cocoon with polar barriers, the frame is taken for saturation with a carbon matrix.

EFFECT: making a high-density reinforcement frame which, after saturation with a carbon matrix, is used to produce carbon-carbon heat-protective material, which is resistant to erosion under the effect of high temperatures and pressure, for example, the tip of a rocket head.

4 cl, 4 dwg

Rotor blade and fan // 2592156

FIELD: machine building.

SUBSTANCE: rotor blade comprises rotor blade housing and rotor blade root section, made integral with rotor blade housing. Housing of rotor blade is formed by stacking of multiple composite sheets, each of which is made of fibres and matrix resin, and includes multiple first sets of composite sheets and multiple second groups of composite sheets located in direction of thickness of blade. Each first group of composite sheets comprises multiple composite sheets laid one on another from centre of thickness of blade towards blade back and which differ from each other by orientation angle of fibres. Each second group of composite sheets comprises one or more composite sheets laid one on another from centre of thickness of blade towards blade pressure surface and which differ from each other by orientation angle of fibres. Layouts of multiple composite sheets in first and in second group of composite sheets are identical. Resultant direction of orientation of fibres directions in multiple composite sheets in each of first group of composite sheets and second group of composite sheets is inclined to rear edge at acute angle from direction of span, passing from central end of rotor blade housing to upper end of rotor blade housing. Another invention of group refers to fan, which includes rotor blade installed in mounting groove of its disk.

EFFECT: group of inventions provides resistance to vibrations of rotor blades at reduction of weight.

4 cl, 14 dwg

FIELD: space.

SUBSTANCE: invention can be used in aerospace industry, in production of sports goods and leisure products. Prepreg with formability comprises a base material from a stitched carbon fibre. Multiple sheet materials 1 are arranged in layers and then stitched and joined together in a stitched base material using stitch thread 2 interlaced when passing through sheet materials 1. Each sheet material 1 is formed by arranging lines 11 of the carbon fibre parallel to each other. Direction of arranging lines 11 of the carbon fibre of each sheet material 1 forms an angle ranging from 30 to 60 to the direction of movement of interlacing stitch thread 2. Degree of the stitched base material tension in its longitudinal direction in case when a specific load per inch of width of the stitched base material is applied in the direction of movement of interlacing stitch thread 2 is equal to or below 4 % when the load is equal to 5N and is equal to or higher than 10 % when the load is 25N. Prepreg is formed by impregnation of the base material from the stitched carbon fiber, in which multiple sheet materials 1 are arranged in layers and then stitched and joined together using stitch thread 2 interlaced when passing through sheet materials 1 by a thermosetting resin within the range from 30 wt% to 50 wt%.

EFFECT: invention enables to obtain a base material from a stitched carbon fibre, which has high shape stability and moldability and provides for convenience in processing a wet prepreg, facilitates production of a 3D shape.

9 cl, 6 dwg, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: sheet includes the first nonwoven web and the second nonwoven web, each of them is the nonwoven web in which the mesh made from the long fibers and it is bonded by thermally connected sections by fusion. Each of the long fibers is the monocomponent fiber, made in the process of uniform spinning of melted thermoplastic polymer. The sections connected by fusion forming the sheet, forms by partial connection by fusion of the first nonwoven web and the second nonwoven web, and each section connected by fusion forming the sheet has on the inner side of its contour the through hole in which the outer peripheral edge has the shape similar to the shape of the contour. The first nonwoven web and the second nonwoven web are connected in the section between the contour of sections connected by fusion forming the sheet and the outer peripheral edge of the through hole.

EFFECT: invention allows to reduce the liquid residue in the absorbent product and reduce its rewetting.

26 cl, 7 dwg, 1 tbl, 3 ex

FIELD: technological processes.

SUBSTANCE: composite radius aggregate contains two or more radius laminated materials. Each radius laminated material comprises a laminated material of composite layers stacked one on top of another, made with a predetermined radius. The predetermined radial orientation of the stacked composite layers coincides with the radial orientation of adjacent stacked composite layers of the composite structure surrounding said two or more radius laminated materials. Each radius laminated material is cut in such a way that at least one side thereof is aligned adjacent to the others to form a composite radius aggregate having a shape corresponding to the area of the radius aggregate of the composite structure.

EFFECT: reducing the cracking of the composite radius aggregate under the action of residual thermal stresses.

15 cl, 17 dwg

Up!