161 results about "Carbon fiber reinforced composite" patented technology

The invention relates to the technical field of composite material forming, and discloses a compression molding process optimization method of a carbon fiber reinforced composite material thin material. According to the method, multi-dimensional process parameters such as temperature gradient distribution data, pressure load change data and resin flow rate data in the compression molding process are collected in real time through a distributed sensing network; establishing a process state evaluation model to carry out initial defect feature recognition on the parameters, and generating an initial defect feature spectrum; performing defect mode matching on the initial defect characteristic spectrum based on the material characteristic database, and separating a main defect data stream from a secondary defect data stream; constructing a real-time compensation instruction set according to the main defect data flow, and synchronously driving a mold pressing equipment executing mechanism to carry out dynamic process parameter correction; the corrected secondary defect data flow is fed back to the material characteristic database to update the defect mode matching rule; and iteratively executing dynamic process parameter correction until a process convergence condition is met, and outputting a quality control report of the finally formed thin material.

The invention belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber reinforced composite material for an aerospace low-temperature storage tank and a preparation method of the carbon fiber reinforced composite material. The preparation method of the carbon fiber reinforced composite material for the aerospace low-temperature storage tank comprises the following steps: (1) preparing a polyamide acid prepolymer solution; (2) adding the polyamide acid prepolymer solution, a phosphorus-containing flame-retardant monomer and nano nitrile rubber into a solvent for reaction to prepare a sizing agent; (3) carbon fibers are soaked in the sizing agent, taken out and dried, and sized carbon fibers are obtained; and (4) mixing nano nitrile rubber with a resin matrix, and then carrying out prepolymerization and thermal imidization curing molding on the mixture and the sized carbon fibers to obtain the carbon fiber composite material. The carbon fiber reinforced composite material obtained by the invention not only has excellent liquid oxygen compatibility, but also can maintain excellent leakage resistance and mechanical properties in an extremely high and low temperature cycle environment, and provides technical support for application of aerospace low-temperature storage tanks.

The invention discloses a composite beam plastic flexural capacity correction calculation method considering interface slippage. The method is suitable for a hogging moment area of a steel-concrete composite beam reinforced by an external prestress carbon fiber reinforced composite material rib. The method comprises the following steps: firstly, determining basic static boundary parameters and a shear connector constitutive model; in the iterative calculation, solving a temporary bearing capacity by utilizing an axial force and moment balance equation, and calculating interface slippage along the beam length and a deformation loss item at the support based on internal force distribution; then determining a rigidity degradation coefficient according to the average slip amount, and dynamically reducing the static yield bending moment to reconstruct the plastic hinge length; and finally, constructing a corrected deformation coordination equation, deducting a deformation loss item in geometric deformation calculation to obtain the real elongation of the in-vitro CFRP rib, and updating a stress parameter until a result is converged. According to the method, by introducing a deformation loss item and a rigidity degradation mechanism, deviation caused by traditional rigid connection assumption is corrected, and accurate prediction of the ultimate bearing capacity is achieved.

The application discloses a multi-component carbon fiber reinforced composite material and a low-temperature infiltration preparation method. The reaction infiltration technology is adopted, a low-melting-point infiltrant is used as a carrier, a high-melting-point component is introduced into the C / C composite material at low temperature, different components are enriched in different regions according to the reaction rate difference of each component and pyrolytic carbon, the internal content of the low-melting-point phase is reduced, and the ablation resistance is improved.

This invention provides a carbon fiber reinforced polymer (CFRP) composite material that enhances the anchoring effect of the metal layer to the CFRP substrate and improves adhesion. [Solution] The CFRP composite material comprises a base material made of CFRP, a first metal layer laminated on the surface of the base material, and a second metal layer laminated on the surface of the first metal layer. The surface of the base material has carbon fiber cutting grooves formed to a depth in which the carbon fibers in the base material are actually cut, and the first metal penetrates into the grooves and is fixed therein. The manufacturing method includes (1) forming the cutting grooves, (2) laminating the first metal layer by thermal spraying (with penetration into the grooves), and (3) laminating the second metal layer by plating.

The present application relates to a kind of carbon fiber composite material nondestructive testing methods based on piezoresistive nanofiber sensor, it includes the following steps: 1), preparation spinning solution;2), build electrospinning platform;3), preparation high frequency response piezoresistive nanofiber sensor;4), high frequency response piezoresistive nanofiber sensor is embedded in carbon fiber composite material board;5), to the carbon fiber composite material board vibration response test and ultrasonic guided wave test, to detect the damage condition of carbon fiber composite material board.The present application can guarantee that fiber sensor is embedded in carbon fiber composite material board, can guarantee that the nondestructive testing of carbon fiber composite material is realized under the premise of not affecting the mechanical properties of carbon fiber reinforced composite and not occupying carbon fiber composite material surface space.

A carbon fiber reinforced composite material includes carbon fiber and a thermosetting resin composition. The thermosetting resin composition is a cured product of a liquid composition that contains unsaturated polyester, a curing agent, a polymerization initiator, and a nanocarbon / nanocellulose complex containing nanocarbon modified by functional a group and nanocellulose. The nanocarbon / nanocellulose complex is dispersed in the thermosetting resin composition. The thermosetting resin composition contains 0.05 to 15% by weight of the nanocarbon / nanocellulose complex. A maximum point stress of the carbon fiber reinforced composite material in a tensile test according to JIS K 7164 is 410 N / mm2 or more. A maximum point stress of the carbon fiber reinforced composite material in a three-point bending test according to JIS K 7171 is 310 N / mm2 or more.

The application discloses an XCT image-based CFRP defect automatic identification and classification method and system, and belongs to the field of carbon fiber reinforced composite material manufacturing and processing quality detection.The application obtains the three-dimensional features of defects through binarization three-dimensional label statistics classification, obtains the two-dimensional features of defects through manual labeling based on the three-dimensional label of defects, and after fusing the three-dimensional features and the two-dimensional features of defects, combines the features with a deep learning method to obtain an efficient real defect identification and classification model, which is simple and efficient and effectively improves the CFRP defect identification precision.The application uses the three-dimensional morphological parameters of defects when labeling the data set, and avoids the unreliability introduced by directly labeling on two-dimensional slices.The application trains a semantic segmentation model for identifying and classifying CFRP defects based on a small amount of two-dimensional CT images, and the semantic segmentation model is used for predicting internal defects of similar materials, so that a large amount of tedious and time-consuming manual image processing for obtaining internal defect data of materials is avoided, and a large amount of labor cost is saved.

The invention relates to a plant-growing concrete plate provided with a carbon fiber reinforced composite material grid, which comprises a plant-growing concrete base body, a carbon fiber reinforced composite material grid, a carbon fiber reinforced composite material grid and a carbon fiber reinforced composite material grid, the at least two layers of carbon fiber reinforced composite material grids are stacked and fixedly embedded in the plant-growing concrete base body in parallel and at intervals, one layer of carbon fiber reinforced composite material grid is arranged along the side close to the upper surface of the plant-growing concrete base body, and the other layer of carbon fiber reinforced composite material grid is arranged along the side close to the lower surface of the plant-growing concrete base body; the interface bonding layer is coated on the surface of the carbon fiber reinforced composite material grid; the plant planting layer is arranged on the upper surface of the plant-growing concrete base body. The high-strength and corrosion-resistant characteristics of the carbon fiber grids are utilized, the bearing capacity and the crack resistance of the plant-growing concrete plate are remarkably improved, meanwhile, the continuous pore structure of the matrix is kept to facilitate plant growth, the technical contradiction that the bearing capacity of the plant-growing concrete plate is insufficient and a reinforced concrete bearing plate is high in manufacturing cost and poor in corrosion resistance is effectively solved, and the bearing capacity of the plant-growing concrete plate is improved. And the method is particularly suitable for slope support, ecological bank protection and other projects.

An epoxy resin represented by the following formula (1), in which in a total amount of an epoxy compound represented by n=1 in the epoxy resin of the above formula, a total content of an epoxy compound represented by the following formula (2) and an epoxy compound represented by the following formula (3) is 1 area % or more and less than 70 area % in HPLC area percentage.

The invention provides a carbon fiber gauze, a preparation method thereof and a carbon fiber reinforced composite material. The carbon fiber gauze comprises short carbon fibers and carbon nanotubes, wherein the carbon nanotubes are bonded to the short carbon fibers through a polymer adhesive; and the mass percent of the carbon nanotubes in the carbon fiber gauze is 1.8-18.6%. According to the carbon fiber gauze, chopped carbon fibers and carbon nanotubes are organically combined, and a unique multi-scale hierarchical toughening structure is constructed. When the carbon fiber gauze is used in a carbon fiber composite material, the chopped carbon fibers play a role in bridging and deflecting cracks among layers, so that the propagation of microcracks can be effectively inhibited. And the carbon nano tube absorbs energy in a resin-rich area at the crack tip of the carbon fiber composite material through mechanisms such as pulling out and breaking, so as to inhibit the generation of nano-scale cracks. In addition, the carbon nanotubes are adhered to the short carbon fibers through the polymer adhesive, so that the carbon nanotubes can be firmly fixed on the short carbon fibers, and the functional stability of the carbon fiber gauze or the carbon fiber composite material is ensured.

The invention belongs to the related technical field of structural topological optimization, and discloses a topological optimization method and equipment for a continuous carbon fiber reinforced composite material, and the method comprises the steps: S1, predicting the mechanical properties of a material at a bending printing path based on a mesoscopic representative volume element, and building a mapping relation between the curvature of the printing path and the corresponding mechanical properties of the material; s2, introducing relative density and a material direction angle for each unit to obtain a structural flexibility function containing the two design variables, and calculating an equivalent elastic matrix; s3, calculating to obtain the material mechanical property corresponding to the current unit based on the mapping relation, and updating the material mechanical property of the current unit; and S4, constructing a topological optimization model, and carrying out topological optimization by adopting the topological optimization model to obtain an optimal topological configuration. According to the method, the curvature generated by fibers induced by a bending printing path is combined, parameters are dynamically adjusted and optimized by introducing fiber curvature constraints, and the mechanical property of a final structure is remarkably improved.

The invention provides a Lamb wave benchmark-free damage imaging method based on adaptive clustering and semantic weighting, and belongs to the technical field of air coupling ultrasonic detection.The Lamb wave benchmark-free damage imaging method comprises the steps that a full-path response signal is collected through orthogonal scanning, a wavelet low-frequency approximation coefficient and a normalized symmetric difference factor are extracted to construct a joint feature vector; and performing unsupervised division of'health-damage 'states on a scanning path by adopting DBSCAN clustering. And semantic tags obtained by clustering are further used as adaptive weights to be embedded into the improved RAPID probability imaging model, and dynamic construction of artifact path suppression and soft reference is realized. In a layering defect detection experiment of the carbon fiber reinforced composite material, compared with a traditional RAPID method, the average size measurement error is reduced by 50.5% under the condition that an independent health reference is completely not needed, the measurement precision of 40 * 20 * 0.05 mm defects in the X / Y direction is improved by 81.7%, the measurement precision of 40 * 20 * 0.05 mm defects in the Y / X direction is improved by 65.5%, and meanwhile 92.3% of boundary artifacts are effectively restrained.

The invention relates to the technical field of carbon fiber reinforced composite materials, and discloses a preparation method of a carbon fiber reinforced composite material for manufacturing a guitar, and the method comprises the following steps: carbon fiber pretreatment, resin matrix preparation, dipping treatment, layering molding and curing molding. According to the preparation method, the carbon fiber fabric or tows are subjected to plasma activation treatment, so that surface inert pollutants are removed, and the interface bonding strength between carbon fibers and a resin matrix is enhanced; the prepared impregnation liquid forms a compact and tough cured body structure after curing by compounding the epoxy resin and the polyurethane resin and combining with the specific functional additive and the acoustic reinforcing agent, so that not only is the efficient transfer of load ensured, but also the overall mechanical property of the composite material is improved, and the service life of the composite material is prolonged. And due to the synergistic effect of the functional additive and the acoustic reinforcing agent, the vibration characteristic of the material is improved, and a material foundation is laid for obtaining excellent acoustic response.

The invention relates to the technical field of PEEK material modification, in particular to a chemical-resistant wear-resistant carbon fiber reinforced PEEK composite material and a preparation method thereof.The chemical-resistant wear-resistant carbon fiber reinforced PEEK composite material is prepared from PEEK, modified PTFE, carbon fibers, molybdenum disulfide, silicone powder and a hyperbranched dispersant, PEEK serves as a base material, special modified PTFE is added on the basis for complementation, and the chemical-resistant wear-resistant carbon fiber reinforced PEEK composite material is prepared. The compatibility between the PTFE material and the PEEK and the carbon fiber is enhanced, the wear resistance of the material is effectively improved, the chemical solvent resistance of the composite material is more effectively enhanced, and the mechanical property of the PEEK composite material is effectively guaranteed under the synergistic effect of the carbon fiber serving as a reinforcing phase; molybdenum disulfide and silicone powder cooperate with PTFE, so that the friction coefficient is reduced, and abrasion is reduced; and the added hyperbranched dispersant promotes uniform dispersion of the components through a steric hindrance effect, prevents agglomeration of carbon fibers, molybdenum disulfide and the like, and realizes the comprehensive properties of high strength, low friction, chemical corrosion resistance and easy processing.

The utility model relates to the technical field of building engineering, concretely is a kind of clamping piece type anchorage device of carbon fiber reinforced composite material board, including fixed outer frame, the inside of fixed outer frame is equipped with installation sliding slot, and one end of fixed outer frame is equipped with locating block, and the bottom end of one end of fixed outer frame is equipped with locating insert block, both sides of locating insert block are equipped with fixed bolt, the inside of fixed outer frame is equipped with fixed clamping block, and the surface middle part of fixed clamping block is equipped with installation slot, one end of fixed clamping block is equipped with fixed insert block, the other end of fixed clamping block is equipped with connecting barrel, the top of fixed clamping block is equipped with fixed top block, and the bottom end surface of fixed top block is close to middle part and is equipped with clamping gasket, and one end of fixed clamping block and fixed top block is equipped with installation push block.

[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 application provides a winding mold for a composite shell with a special-shaped rubber layer and a use method, and belongs to the technical field of carbon fiber reinforced composite material forming. The mold solves the problem that a common mold does not reserve space for a rubber heat insulation layer of an extension part, it is difficult to prepare the shell through fiber forming, and the rubber heat insulation layer causes a negative angle to be formed in the mold, thereby causing the problem of demolding difficulty. The mold comprises a mandrel and a mold main body. The mold main body is a spliced structure, and comprises a first mold and a second mold. The first mold is provided with a concave splicing surface, and the second mold is provided with a convex splicing surface. When the first mold and the second mold are spliced and fixed, the inner regions of the concave splicing surface and the convex splicing surface are mutually attached to realize axial positioning, and the edges of the concave splicing surface and the convex splicing surface are mutually separated to form a gap extending in the direction of the mandrel and in a circumferential ring shape. The mold is mainly used for manufacturing a composite shell with a special-shaped rubber layer.

The utility model discloses a novel rock core box, and relates to the technical field of rock core boxes. The carbon fiber reinforced composite rock core box comprises a rock core box body, the rock core box body is a hollow rectangular box body, the upper surface of the rock core box body is hollowed out, the rock core box body is made of a carbon fiber reinforced composite material, a partition plate assembly used for separating areas is arranged in the rock core box body, a frame body assembly is arranged on the upper surface of the rock core box body, and a cover plate assembly is arranged above the rock core box body. The rock core box is made of the carbon fiber reinforced composite materials, so that the rock core box has good corrosion resistance, abrasion resistance, impact resistance and portability, adapts to complex field environments, is light in weight and convenient to carry, and the service life of the rock core box can be prolonged; in addition, according to the technical scheme, the partition plate assembly is designed in a detachable mode and can be assembled again according to the diameter size of the rock core, so that the adaptability problem is solved, the cover plate assembly can achieve the installation protection function, and the rock core is prevented from being stolen.

In order to provide: a carbon fiber bundle having a high bundle strength, which is required when stably and annularly laminating a carbon fiber bundle impregnated with a matrix resin while applying a high tension to the carbon fiber bundle, said carbon fiber bundle being of low thickness and having a low thickness variation coefficient; and a method for producing said carbon fiber bundle, the carbon fiber bundle according to the present invention has, in a carbon fiber bundle having a test length of 500 mm, a bundle strength of 1.8‒3.0 GPa, a bundle-strength Weibull shape coefficient of 14‒30, a thickness of 0.05‒0.11 mm, and a thickness variation coefficient of 7.0% or less, the carbon fiber bundle being substantially twist-free.

The invention discloses a spraying process for a carbon fiber reinforced composite material workpiece. The spraying process comprises the following steps: S1, polishing and roughening treatment; s2, spraying primer; s3, baking is conducted; s4, polishing and roughening treatment; s5, spraying finish paint; s6, baking is conducted; and S7, grinding and polishing. According to the technology, an existing two-bottom and one-surface spraying technology of a fiber reinforced composite material workpiece is optimized into a one-bottom and one-surface spraying technology, the baking frequency and the baking time are optimized, the technological process is integrally simplified, and the technological process time is shortened.

The present invention addresses the problem of providing a carbon fiber bundle and a method for manufacturing the same, wherein the interfacial shear strength (IFSS) of the carbon fiber bundle indicating adhesion to resin is high, and the 90° bending strength of a carbon fiber reinforced composite material can be increased without reducing the strand elastic modulus and strand strength. The crystallite size is 2.9 to 3.4 nm and the iPa on the carbon fiber surface is 0.30 μA / cm2 or greater. In a method for manufacturing a carbon fiber bundle including a flame-proofing step for heating a carbon fiber precursor fiber bundle in an oxidative atmosphere and a carbonization step for heating the flame-proof fiber bundle after the flame-proofing step in a non-oxidative atmosphere, a substantially untwisted carbon fiber precursor fiber bundle is used, and the elongation of the fiber bundle in a carbonization temperature region of 1,000°C or greater in the carbonization step is set to −2.7% or greater, and the maximum carbonization temperature is set to 1,800-2,200°C.

The embodiment of the utility model provides a building structure design beam reinforcing structure. The building structure design beam reinforcing structure comprises an original structure beam; the outer reinforcing layer wraps the outer side of the original structural beam; the anchoring plate is arranged in the outer reinforcing layer and is arranged in the length direction of the original structural beam; the prestressed pull rod penetrates through the anchoring plate and is fixed on the original structural beam; the adhesive layer is located between the outer reinforcing layer and the original structural beam; the outer reinforcing layer is of a multi-layer composite structure and sequentially comprises a carbon fiber reinforced composite material layer, a glass fiber fabric layer and a high-strength concrete protection layer from inside to outside. The anchoring plate comprises a plurality of first reinforcing ribs and second reinforcing ribs which are arranged at intervals, the first reinforcing ribs are arranged perpendicular to the length direction of the original structural beam, and the second reinforcing ribs are arranged in the length direction of the original structural beam. Through the scheme of the embodiment of the invention, the problems of local slippage and failure caused by unstable bonding performance between the outer reinforcing layer and the original structure can be solved.

The invention discloses a high-impermeability carbon fiber reinforced composite material for a hydrogen storage bottle and a preparation method of the high-impermeability carbon fiber reinforced composite material. The composite material comprises the following components in parts by weight: 50-65 parts of epoxy resin, 5-10 parts of phenolic resin, 10-15 parts of polyether-ether-ketone, 3-5 parts of maleic anhydride grafted PEEK, 15-25 parts of a hydrogen-corrosion-resistant curing agent, 8-12 parts of an impermeability nano filler and 8-12 parts of elastic rubber. Through synergistic modification of the epoxy resin, the phenolic resin, the nanofiller and the PEEK and in combination with the multi-scale barrier effect of the nanofiller, the hydrogen permeability is remarkably reduced, and the compactness and mechanical properties of the composite material are ensured.

The present application relates to the technical field of composite material repair, and particularly relates to a composite material rapid repair method based on chopped carbon fiber technology, comprising the following steps: chopped carbon fiber pretreatment; resin matrix preparation; spray slurry preparation; laser cleaning of the damaged area; scanning of the unmanned aerial vehicle; layered synchronous curing; evaluation of the coating quality; the chopped fiber spraying technology is used in the aspect of composite material damage repair, the repair time is reduced, the cost is reduced, the interface bonding strength and the fiber orientation are optimized, the problem that the interlayer peeling or the fiber orientation mismatching is prone to occur in the repair area, and the mechanical property recovery rate of the repaired material is low is solved, the thickness of the bubble defect can be rapidly detected, the method is suitable for efficient, accurate and lightweight repair of carbon fiber reinforced composite material (CFRP) damage, and is particularly suitable for on-site rapid repair scene.

The present invention provides epoxy resins, curable resin compositions, and cured products thereof that exhibit high flexural modulus and low water absorption. An epoxy resin represented by the following formula (1). [Formula 1] JPEG0007869933000011.jpg58149 (In formula (1), multiple A's are represented by the structural formula of X or Y, with at least one of the multiple A's being X and at least one of the multiple A's being Y. Multiple B's are represented by the structural formula of Z. G represents a substituted or unsubstituted glycidyl group, R 1 R represents a hydrogen atom, a hydrocarbon group with 1 to 4 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms. 2 R represents a hydrocarbon group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms. 3 , R 4 Each represents a hydrogen atom or a methyl group. n is the average number of repetitions, and 1

The utility model provides a carbon fiber concrete filled steel tube combination column structure with built-in X-shaped CFRP (carbon fiber reinforced plastic) profiles. The carbon fiber concrete filled steel tube combination column structure comprises a CFRP profile X-shaped inner column, carbon fiber angle steel, a carbon fiber batten plate, a steel tube, a carbon fiber reinforcement layer and filling concrete. An X-shaped inner column is composed of four pieces of carbon fiber equilateral angle steel, an outer constraint frame is composed of carbon fiber angle steel located at the four corners of the core column and batten plates on the four sides, the outer side face of a steel pipe is wrapped with a carbon fiber reinforced composite material in a surrounding mode, the X-shaped inner column, the outer constraint frame and the outer steel pipe are concentrically and coaxially arranged, and a cavity formed in the middle is filled with concrete. According to the utility model, the advantages of the concrete filled steel tube and the carbon fiber reinforced composite material are combined, the bearing capacity and the deformation resistance of the structure are improved, the dead weight of the structure is reduced, the manufacturing and the construction are convenient, the ductility is large, the anti-seismic property is good, and the anti-fatigue and anti-impact toughness is strong, and the carbon fiber reinforced composite material can be widely used in important structures such as large bridges, high-rise buildings, subway stations and the like.

A method for manufacturing a composite structure that has a carbon-reinforced composite component and a glass-reinforced composite component, the method including contacting a glass-reinforced composite material with a carbon-reinforced composite material to yield a composite layup, the glass-reinforced composite material having a glass reinforcement material and a polymeric matrix material, wherein the glass reinforcement material has a silica content of at least 60 percent, and co-curing the composite layup.

Provided are an epoxy resin having excellent heat resistance, a curable resin composition, a cured product thereof, and a carbon fiber-reinforced composite material. This epoxy resin is represented by formula (1), and in a chromatogram of high performance liquid chromatography, when a is the peak area of a compound represented by formula (2) and b is the peak area of a compound represented by formula (3), b / a is 0.012-0.050. (In formula (1), n is the average value of the number of repetitions, which represents 1 lt; nlt; 15 is a real number. Each X independently represents a monovalent group represented by formula (a) or formula (b), and at least one is a monovalent group represented by formula (a); and * represents a bond to an oxygen atom).

The invention relates to a crash structure for a motor vehicle with at least one hollow profile arrangement (4) composed of longitudinally wave-shaped wall elements (8, 10, 12, 14) that are bonded together at connecting surfaces (6), wherein the wall elements (8, 10, 12, 14) are made of a fiber-reinforced plastic, the fiber-reinforced plastic being made of prepreg CFRP material. The invention further relates to a method for manufacturing such a crash structure (2).