41 results about "Volume content" patented technology

The invention discloses a polyimide composite material and a preparation method thereof, and relates to the technical field of functional composites.The polyimide composite material is composed of hollow quartz fibers and silicon-containing polyimide resin, the fiber volume content of the polyimide composite material is 45%-60%, and the density of the polyimide composite material is 1.25-1.55 g / cm < 2 >; wherein the silicon-containing polyimide resin is formed by polymerizing a mixture of aromatic dianhydride, aromatic diamine and diamine containing a siloxane structure, and an end-capping reagent. The preparation method comprises the following steps: synthesizing a polyamide acid solution, preparing a prepreg by preimpregnation, performing by a vacuum bag method, performing hot-pressing curing and performing high-temperature post-treatment. Through collaborative innovation of the components and the process, the preparation method is simple, and the composite material has ultralow density, ultrahigh heat resistance, low dielectric constant and high strength and is suitable for the fields of aerospace, 5G communication, semiconductors and the like.

The present application relates to the technical field of fireproof coating, and particularly relates to a geopolymer-based aerogel fireproof coating, a preparation method and application thereof. The fireproof coating comprises the following components in the following proportions: geopolymer precursor material, alkaline activator, aerogel, fiber and water; the mass ratio of the alkaline activator and the geopolymer precursor material is 0.52-0.63:1; the volume content of the aerogel is 70%-85%; the mass content of the fiber is 0-1% and is not 0; and the water-binder ratio is 0.5-0.7. The added fiber can effectively inhibit the high-temperature shrinkage of the coating, and at the same time, to a certain extent, improve the tensile strength and tensile bonding strength, so as to ensure the structural stability and continuous fireproofing capability of the coating in a fire scene; by optimizing the aerogel content and the water-binder ratio, the coating realizes an excellent balance between the thermal conductivity and the compressive strength, and has the characteristics of high strength and efficient heat insulation; the production process of the present application is low-carbon and environmentally friendly, and has economic and environmental benefits.

The invention relates to the technical field of high-temperature fire-resistant composite materials, and provides a high-density ablation-resistant rudder heat-proof cup and a manufacturing method thereof.The manufacturing method comprises the steps that 2.5 D quartz fabric is adopted for Z-direction sewing; the sewn fabric is put into a shape maintaining device, and the shape maintaining device adjusts the fiber state of the fabric and improves the fiber volume content to 50-65%; the fabric subjected to shape maintaining operation is firstly impregnated and shaped with inorganic sol and then impregnated and cured with a phenolic aldehyde solution, and a rudder heatproof cup blank is obtained; and finally, machining to obtain the rudder heat-proof cup. The density of the rudder heat-proof cup reaches 1.6 g / cm < 3 > or above, the linear ablation rate on a kerosene small engine is smaller than 0.1 mm / s, and the rudder heat-proof cup is excellent in ablation performance and suitable for thermal protection of a ballistic missile aerial rudder shaft.

The invention relates to a hybrid fiber composite material rib with ribs on the surface and a preparation method thereof, and belongs to a resin fiber material. The rib material comprises carbon fibers, other fibers and a resin matrix, the carbon fibers and the other fibers are embedded in the resin matrix, and spiral resin ribs are arranged on the surface of the rib material. The other fibers are selected from one or more of aramid fibers, basalt fibers and glass fibers. The carbon fibers are distributed at the core part of the rib material, and the other fibers are distributed at the periphery of the carbon fibers. The diameter of the rib material is 2mm-36mm, the volume content of the carbon fibers is 52%-57%, and the volume content of the other fibers is 19%-22%. The rib material has the excellent axial strength and elasticity modulus of the core layer carbon fiber and the additional performance of other fibers on the surface layer, the comprehensive performance and integrity of the rib material are improved, and the service requirements of more complex application scenes are met.

The invention discloses a preparation method and a preparation mold for a thin-wall ceramic matrix composite spray pipe, belongs to the technical field of preparation of ceramic matrix composite spray pipes, and solves the problems that the preparation process of an existing three-dimensional needling preform is complicated and is not suitable for a thin-wall spray pipe preform. Comprising the following steps: driving a mold to rotate by utilizing a cloth tape winding machine, and winding a preform on the mold; cracking the preform by adopting a vapor deposition process; depositing a pyrolytic carbon interface layer on the surface of the preform; performing high-temperature treatment on the prefabricated body; impregnating and curing the prefabricated body by adopting a precursor impregnating and cracking process; carrying out SIC matrix deposition on the preform by adopting a chemical vapor deposition process; and machining the inner and outer molded surfaces of the prefabricated body. According to the method, the carbon cloth prepreg tape winding forming mode is adopted, so that the preparation precision of the preform can be improved, fiber faults in the machining process are reduced, and the circumferential strength is enhanced. And meanwhile, the fiber volume content of the preform can be increased by a prepreg tape winding preparation process.

The invention belongs to the technical field of thermal field equipment, and discloses a guide cylinder for a thermal field and a manufacturing method of the guide cylinder. An integrated fiber prefabricated body is prepared on a mold, in the process, by controlling fiber layer laying, a barrel prefabricated part with the low fiber volume content, a ring prefabricated part with the high fiber volume content and a gradient transition area connecting the barrel prefabricated part and the ring prefabricated part are formed in the prefabricated body, and then a Z-direction reinforcing technology is adopted to enable the barrel prefabricated part, the ring prefabricated part and the gradient transition area to form a whole with continuous fibers; and carrying out densification treatment on the prefabricated body. By constructing an integrated structure with gradient performance, the guide cylinder body has excellent heat insulation performance, and the bottom ring piece has high mechanical strength. An anti-scouring functional layer with a reinforced bonding interface can be preferably arranged on the inner wall, and a bionic microscopic groove is machined, so that the structural reliability and the performance matching degree of the guide cylinder are cooperatively improved, and the service life of the guide cylinder is prolonged.

[Problem] A problem to be addressed by the present invention is to provide a CFRP with a low risk of edge glow by virtue of controlling the structure of the CFRP and without relying on expensive electroconductive particles. In other words, provided is a CFRP such that the risk of edge glow is greatly decreased, even in a case where electroconductive particles are used in an amount equal to or smaller than in a conventional technology. Further provided is a CFRP such that the risk of edge glow is greatly decreased without using electroconductive particles.[Solution] A carbon-fiber-reinforced composite material including carbon fiber sheets containing unidirectionally arranged carbon fibers, laminated multidirectionally one on another, and impregnated with a matrix resin, which is cured; wherein, assuming that a region in which the carbon fibers have the same angle of fiber orientation consecutively in the thickness direction is defined as a Layer, and that, when the Layer is composed of a plurality of regions having a given thickness, and having different carbon fiber volume content factors (Vcf), each of the regions having a given thickness is defined as a Sublayer, the carbon fiber sheet contains a specific Layer that satisfies (1) to (3), and the thickness of a resin portion between the specific Layer and at least one Layer adjacent to the specific Layer is 5 μm or less; (1) the average Vcf of the Layer (hereinafter referred to as the Layer average Vcf) is 50% or more, (2) as both outermost parts of the Layer, Sublayers each having a Vcf the ratio of which to the Layer average Vcf is 0.5 or more (hereinafter, such a Sublayer is referred to as a high-Vcf Sublayer) are disposed, wherein each average Vcf is higher than the Layer average Vcf, and (3) between the high-Vcf Sublayers as both outermost parts of the Layer, a Sublayer having a Vcf the ratio of which to the Layer average Vcf is less than 0.5 (hereinafter, such a Sublayer is referred to as a low-Vcf Sublayer) exists.

The invention discloses a method for detecting the content of mica in fine aggregate, and belongs to the technical field of concrete raw material detection. The method comprises the following steps: S1, preparing an SEM sample sheet: preparing an epoxy resin block embedded with fine aggregate, and carrying out mirror polishing treatment on the surface of the epoxy resin block to prepare the SEM sample sheet; step S2, image acquisition; s3, preliminarily screening mica particles; s4, secondary screening of mica particles; s5, screening the mica particles for the third time; s6, mica content calculation: calculating the volume content and the mass content of mica particles in the fine aggregate. SEM sample slices are prepared according to the steps of drying, screening, sample inlaying, mirror polishing and the like, and human errors are prevented from being introduced; the mica particles in the SEM sample slice image are identified and screened by adopting three modes, so that the comprehensiveness and the accuracy of the mica particle detection mode are improved, and the accuracy and the reliability of the mica content detection result are further improved.

A kind of continuous fiber wet winding process technology method and device of post large tension, it is characterized in that, including the following procedures: fiber yarn route design, fiber spread yarn thinning control, impregnation auxiliary adjustment, winding resin preparation, fiber impregnation adjustment, impregnated fiber spread yarn extrusion glue adjustment, winding tension adjustment, winding line design, solidification and mechanical property test.The device of the application is simple, can be popularized and applied, and low wear winding under large winding tension can be realized.The present application effectively solves the process problem that traditional process cannot simultaneously realize fiber low damage impregnation and fiber large tension precision winding by designing special winding device and matching winding process, and provides an efficient process technology path for realizing high fiber volume content and high mechanical property fiber composite material preparation.

The application provides a kind of nano-modified ultra-high toughness concrete and its preparation method, provide a kind of nano-modified ultra-high toughness concrete, by mass fraction, including the following preparation raw materials: fine aggregate 100~140 parts, water 8~18 parts, water reducing agent 2~4 parts;Cementitious material: silica fume 10~20 parts, superfine fly ash silicate aluminate fine substance 10~30 parts, cement 50~80 parts;Wherein, water-binder ratio is 0.16;And steel fiber volume content 1.2~2.5%, the content of nano-silica is 0.5~2%.The application is limited by the composition of ternary cementitious system and the content of nano-silica;Obtain the working performance and mechanical properties of ultra-high toughness concrete that have been greatly improved;The nano-modified ultra-high toughness concrete preparation method of the application has the characteristics of low cost, convenient operation, wide application scene, suitable for industrial production.

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 invention provides a discrete entity unit-based long fiber composite material performance prediction method, and belongs to the field of composite material simulation calculation, and the method comprises the following steps of: firstly, collecting model parameters; then, based on a unit cell array and fiber relocation, establishing a microscopic representative volume element (RVE) model of the long fiber composite material, and predicting to obtain equivalent performance parameters of a prepreg sheet; and finally, establishing a microscopic RVE model by simulating random placement of prepreg sheets, and predicting equivalent macroscopic performance parameters of the long-fiber composite material in combination with the microscopic RVE model. According to the method, the macroscopic performance parameters of the long-fiber composite material with high fiber volume content can be obtained only by determining the parameters of the fiber and the resin matrix and carrying out finite element asymptotic damage analysis based on a sequential multi-scale method. Meanwhile, a standard hexahedron unit is adopted for the microcosmic RVE model, the number of node freedom degrees is reduced, and high-efficiency and high-precision macroscopic performance prediction of the long-fiber composite material can be achieved.

The application discloses a kind of elastic modulus prediction calculation methods under the multiscale of ultra-high performance concrete, the prediction calculation method includes (1) according to material composition and representative volume element (RVE) size, the structure type of determining solution object;(2) according to the structure type of solution object, RVE unit internal component is divided into matrix phase and inclusion phase;(3) according to the volume content of matrix phase, elastic parameter and the morphology of inclusion phase, elastic parameter, volume content, the local strain concentration tensor of all inclusion phase is calculated;(4) according to the local strain concentration tensor of all inclusion phase, the elastic parameter of RVE is calculated using mean field theory.Compared with conventional test methods such as empirical formula method, finite element calculation method, this method is not only more suitable for a variety of doped ultra-high performance concrete composite materials, but also can improve the calculation efficiency of concrete elastic parameters under different scales.

Provided is a concrete reinforcing composite material that is impregnated with a thermoplastic resin having excellent alkali resistance and handleability. In a concrete reinforcing composite material 10, a core material 12 is formed from a fiber bundle of reinforcing fibers. The core material 12 is covered with a coating layer 14 made of a thermoplastic resin. The core material 12 is impregnated with the thermoplastic resin. The thickness of the coating layer 14 is 84 μm or more. The fiber volume content Vf of the core material 12 is 60% or more.

The application discloses a kind of directional reinforced puncture fabric and its forming method, comprising: step 1: according to the design of fabric directional reinforcement requirement, unit layer includes at least one fiber layer, and the unit layer formed by at least one fiber layer is distributed with fiber in multiple directions, and the volume content ratio of fiber distributed in multiple directions is not all same;Step 2: the fiber layer in the first layer unit layer is sequentially laid in the puncture device and puncture pressurization setting is carried out;Step 3: the fiber layer of remaining unit layer is sequentially carried out puncture pressurization setting according to step 2 until reaching predetermined height;Step 4: the position of puncture needle is replaced by Z direction fiber bundle one by one, and finally three-dimensional fabric is formed.The application utilizes the fiber type, fiber structure, organization structure and fiber layer combination design of fiber layer, realizes the limit promotion of fabric specified single or multiple direction fiber volume content or performance, forms directional reinforced puncture fabric to meet the requirement of material directional high performance.

The invention provides a numerical analysis method for an all-carbon hybrid laminated plate based on continuum damage mechanics, which is characterized in that a constitutive model for describing LE and HE layers and a UMAT subprogram for damage evolution are written based on secondary development of finite element software, and material parameters are obtained by subsequently performing uniaxial tensile test on a pure LE fiber laminated plate and a pure HE laminated plate. Two centralized configurations with the same LE layer volume content and different LE layer thicknesses are prepared by utilizing a vacuum bag method, and damage evolution and stress-strain response of the centralized configurations are obtained by utilizing a digital image correlation technology. On the basis of continuous medium damage mechanics, progressive damage of an LE layer and local layering of an LE / HE interface are achieved in a finite element model, and the micro damage mechanism of the pseudo-ductility is revealed. According to the method, the defects of an existing numerical method are overcome through the simulation technology, the efficient, feasible and accurate method is provided for accurately predicting the full-carbon interlayer hybrid material, and experimental verification is carried out.

The present invention is a thermally conductive sheet comprising a plurality of unit layers, each comprising a silicone resin and a thermally conductive filler, the plurality of unit layers being laminated such that the plurality of unit layers are adhered to each other, wherein a volume content of the silicone resin is 32% by volume or less, and a compressive load at a sheet area of 25.4 mm×25.4 mm when the thermally conductive sheet is 30% compressed from a direction perpendicular to an adhesion plane on which the plurality of unit layers are adhered to each other is 7.0 kgf or less. According to the present invention, it is possible to improve the thermal conductivity and enhance the softness of a thermally conductive sheet using a silicone resin as a matrix component and composed of a large number of unit layers laminated as compared with the conventional one.

The application discloses a kind of temperature response type double-layer interlocking fabric and preparation method thereof, including surface layer, inner layer and interlocking yarn, surface layer and inner layer form interlocking by interlocking yarn, inner layer is formed by inner layer warp yarn and inner layer weft yarn interweave, inner layer warp yarn and inner layer weft yarn all include core line and ornament line, fabric has first state, second state and third state, the length and diameter of interlocking yarn in first state are all greater than the length and diameter in second state;The length and diameter of core line in first state are all less than the length and diameter in second state, the length and diameter of core line in third state are all greater than the length and diameter in second state;The length and diameter of ornament line in third state are all less than the length and diameter in second state.The double-layer interlocking fabric of the application can adjust air layer volume content in fabric with temperature change, to realize the function of storing and releasing heat, can form stable and comfortable temperature for people in the closed space of fabric contact skin.

The invention relates to a method for repairing a part (10) made of a ceramic matrix composite material, the part having a damaged zone, the method comprising: - a step of machining away at least the damaged zone so as to obtain a recessed repair zone (12); - a step of placing, in the recessed repair zone (12), a repair material (13) comprising at least one ply (15) of composite material preimpregnated with a ceramic matrix precursor; - a step of compacting the one or more plies (15) of composite material preimpregnated with the ceramic matrix precursor in order to increase a fiber volume content; and - a sintering step for consolidating a bond between the repair material (13) and the composite part (10).

The invention provides a method and a system for predicting the static water external pressure bearing capacity of a composite material flexible pipe, and relates to the technical field of ocean engineering, the method comprises the following steps: calculating the structural instability pressure of a pipeline under the static water external pressure and the material failure pressure obtained by iteration based on a Hashin-Yeh failure criterion in parallel, and taking the smaller value of the two as a final bearing capacity prediction value. Wherein the thick lining layer and the outer protection layer are theoretically divided into sub-layers with the same thickness as the enhancement layer, so that the improved laminated plate theory can be applied to accurately calculate the instability pressure; meanwhile, a formula based on fiber and matrix performance and fiber volume content is adopted to calculate a material elastic constant, and a Hashin-Yeh criterion capable of distinguishing multiple failure modes is utilized to carry out iterative failure judgment, so that an empirical damage coefficient is abandoned. According to the method, the accuracy and reliability of still water external pressure bearing capacity prediction of the deep sea composite material flexible pipe are remarkably improved, and a scientific basis is provided for pipeline safety design and optimization.

The invention provides a carbon-carbon composite material cylinder and a preparation method and application thereof, and the preparation method comprises the following steps: impregnating a carbon fiber filament with an infiltration glue solution to obtain a glue-carrying carbon fiber with the glue solution volume content of 15-20%; preparing the glued carbon fiber into a cylindrical winding body through a wet winding process; the winding mode of the adhesive carbon fibers in the wet winding process is longitudinal plane winding, annular plane winding and spiral winding which are performed in a crossed manner; curing the cylindrical winding body to obtain a resin-based composite material blank; placing the blank in chemical vapor deposition equipment for primary carbonization and chemical vapor deposition densification to obtain a carbon-carbon composite material blank; the blank is sequentially subjected to machining, dipping carbonization densification and graphitization, and a carbon-carbon composite material semi-finished product is obtained; and after the semi-finished product is subjected to machining and surface polishing, the surface pyrolytic carbon layer is prepared. The carbon-carbon composite material cylinder has higher strength and longer service life.

The invention relates to an abrasive article and a method of forming. An abrasive article may include a body including an abrasive portion. The abrasive portion may include abrasive particles and a filler contained in a binder material. The filler may include iron disulfide and potassium aluminum fluoride in a volume content ratio greater than 0.53 and less than 0.71.

The invention provides an annular closed three-dimensional fabric weaving method and equipment, and relates to the technical field of three-dimensional weaving technology and equipment.The annular closed three-dimensional fabric weaving equipment comprises a fabric outer layer, axial laying yarn, a fabric inner layer and crosslinking yarn, and the fabric outer layer and the fabric inner layer are woven in a crossed mode; the cross-linked yarn is composed of a woven yarn on the outer layer of the fabric and a woven yarn on the inner layer of the fabric, the cross-linked yarn is evenly distributed in a plurality of positions in the circumferential direction, and the axial layer laying yarn is located in a closed area formed by the outer layer of the fabric, the inner layer of the fabric and the cross-linked yarn. According to the annular closed three-dimensional fabric weaving method and equipment, the fabric is of a three-dimensional body structure large in fiber volume content, cross section size and wall thickness and internally provided with laying yarn, the surface layer weaving angle change range is large, the overall mechanical property is good, the inner layer yarn and the outer layer yarn are cross-linked, and the defect that the radial performance is poor due to layer-by-layer hooking in multi-layer interlocking weaving is overcome.

The utility model discloses a composite pressure-bearing cylinder connecting structure, which relates to the technical field of new materials and comprises a composite cylinder, a metal part is hermetically mounted at the top end of a main body of the composite cylinder, and a pin bolt is fastened and connected between the surface of the metal part and the surface of the main body of the composite cylinder. The composite pressure-bearing cylinder has the beneficial effects that through simulation analysis, the strength, rigidity and sealing performance of the composite pressure-bearing cylinder are greatly improved, the bearing capacity is very considerable, the composite pressure-bearing cylinder is formed by winding in a wet method, bubbles are extruded out by controlling tension, and fiber abrasion and initial defects can be reduced by applying the resin glue solution; the fiber yarn arrangement parallelism is good; the production automation degree is high, the requirement for operators is low, the efficiency is high, the fiber volume content is high, the material utilization rate is high, and the quality consistency is good.

The application discloses a kind of mixed bamboo fiber reactive powder concrete tunnel cable trench prefabricated cover plate and preparation method thereof, belong to civil engineering material and prefabricated component technical field, including reactive powder concrete matrix and mixed reinforcing fiber, mixed reinforcing fiber includes bamboo fiber and steel fiber, the volume content of steel fiber is 0.5-1% of the volume of reactive powder concrete matrix, the volume content of bamboo fiber is 0.1-0.5% of the volume of reactive powder concrete matrix.The application uses the above-mentioned mixed bamboo fiber reactive powder concrete tunnel cable trench prefabricated cover plate and preparation method thereof, the mixed bamboo fiber reactive powder concrete tunnel cable trench prefabricated cover plate prepared not only inherits the advantages of RPC material superhigh strength and high durability, more through the synergistic effect of two fibers, realize the significant improvement of toughness, the enhancement of early crack resistance, the further optimization of dead weight, and reduce the cost and potential risk of single dependence on steel fiber.

The application discloses a method for determining a critical buckling load of a glass fiber composite circular saw blade, and is used for a reinforced composite circular saw blade with an outer diameter D, a thickness H, a center hole diameter Φ and a flange diameter d; wherein a radial length of a tool holder is L1; an elastic modulus of reinforcing fibers in the glass fiber composite material is E f , a Poisson's ratio is v f , and a volume content is V f ; an elastic modulus of a resin matrix is E m , a Poisson's ratio is v m , and a volume content is V m ; an elastic modulus of a tool holder material is E1, a Poisson's ratio is v m1 ; a density of the glass fiber reinforced composite material is ρ; a center hole edge is fixedly clamped, an angular velocity of the saw blade is ω during cutting work, a normal force component is applied to the saw blade to cause out-of-plane buckling of the saw blade, and the critical buckling load P ncr of the glass fiber composite circular saw blade is determined by a formula. According to the method, the critical buckling load Pncr of the circular saw blade during work can be determined according to original working conditions and material parameters, and thus a basis is provided for design and development of the glass fiber composite circular saw blade.

The invention relates to the technical field of fireproof coatings, in particular to a geopolymer-based aerogel fireproof coating as well as a preparation method and application thereof. The fireproof coating comprises the following components in proportion: a geopolymer precursor material, an alkaline activator, aerogel, fibers and water, the mass ratio of the alkaline activator to the geopolymer precursor material is (0.52-0.63): 1; the volume mixing amount of the aerogel is 70%-85%; the mass mixing amount of the fibers is 0-1% and is not 0; the water-binder ratio is 0.5 to 0.7. The added fibers can effectively inhibit the high-temperature shrinkage of the coating, and meanwhile, the tensile strength and the tensile bonding strength are improved to a certain extent, so that the structural stability and the continuous fireproof capability of the coating in a fire scene are ensured; by optimizing the doping amount of aerogel and the water-binder ratio, the heat conductivity coefficient and the compressive strength of the coating are excellently balanced, and the coating has the characteristics of high strength and efficient heat insulation; the production process is low-carbon and environment-friendly, and has both economic benefits and environmental benefits.

The subject application relates to abrasive articles and methods of forming. An abrasive article can include a body including an abrasive portion. The abrasive portion can include abrasive particles and filler contained in a bond material. The filler may include iron disulfide and potassium aluminum fluoride in a volume content ratio of greater than 0.53 and less than 0.71.

The invention provides a bent pultrusion composite material automobile rear anti-collision beam and a pultrusion forming device and method thereof.The bent pultrusion composite material automobile rear anti-collision beam comprises a main beam and reinforcing ribs, the main beam and the reinforcing ribs are made of a composite material, the composite material comprises a resin matrix and a reinforcing material, and the volume content of the reinforcing material is 55-70%; the resin matrix comprises 100 parts of epoxy resin, 92-98 parts of an epoxy curing agent, 2-7 parts of an initiator, 0-30 parts of an inorganic flame-retardant filler, 5-30 parts of a phosphorus-based flame retardant, 1-2 parts of cellulose nanocrystals, 9-10 parts of linen fibers and 0.5-4 parts of a release agent; the reinforcing material comprises fiber pultrusion yarn or fiber fabric. By adjusting the mounting position of the die and cooperating with the adjustable traction system, bent profiles with different curvatures can be pulled and extruded, and the traction system does not need to be replaced; and the rear anti-collision beam with a certain curvature radius is produced by adopting a bending and pultrusion process, so that rapid production is realized, and the product quality and stability are improved.

The application relates to the technical field of reinforced soil engineering, in particular to a kind of fiber reinforced soil equivalent shear strength calculation method and device, wherein, the method comprises: obtaining the length, diameter and content of target fiber in fiber reinforced soil, and calculating the volume content and slenderness ratio of target fiber;Obtain the length, diameter and content of target fiber in fiber reinforced soil, calculate the volume content and slenderness ratio;Based on the volume content and slenderness ratio, and the normal stress and cohesive force of un-reinforced soil, the initial equivalent normal stress and initial equivalent cohesive force of fiber reinforced soil are calculated;The initial equivalent normal stress and initial equivalent cohesive force are corrected to obtain the actual equivalent normal stress and actual equivalent cohesive force, and then the equivalent shear strength of fiber reinforced soil is calculated. Thus, in the related art, the situation that the shear strength of reinforced soil body is not considered in the case of fiber excess, and too many parameters are set in the calculation method, which is difficult to calibrate, and it is difficult to provide beneficial guidance for actual engineering design and other problems.