95 results about "Interlaminar shear" patented technology

The invention provides a method for improving the high-temperature interface strength of a quartz fiber reinforced polyimide resin composite material. The method comprises the steps of fiber cleaning, fiber surface activation, fiber surface grafting treatment and composite material preparation. Taking a quartz fiber reinforced PMR type polyimide resin composite material as an example, the bending strength of the composite material prepared by the method is greater than or equal to 373.5 Mpa under the test condition of 350 DEG C / 20 min, and is improved by 46%; the interlayer shear strength is greater than or equal to 34.5 MPa and is improved by 43%, and the dielectric constant is less than or equal to 3.40. The method solves the problems of poor interface bonding strength, low mechanical strength and poor structural stability of the quartz fiber reinforced polyimide resin-based composite material under the long-time high-temperature working condition, and is simple, easy to operate and suitable for batch production and application.

This application relates to the field of household appliance technology, disclosing a panel and its molding process, and a household appliance. The panel includes: a fiber composite material layer; and a magnetic insert located on one side of the fiber composite material layer in the thickness direction. The magnetic insert includes a magnetic material and a resin encapsulating the magnetic material. The resin encapsulating the magnetic material can chemically react with the resin of the fiber composite material layer, thereby enhancing the bonding strength between the fiber composite material layer and the magnetic insert, eliminating the physical interface between the fiber composite material layer and the magnetic insert, and improving the interlayer shear strength. This completely solves the problems of panel delamination and warping caused by the difference in thermal expansion coefficients due to the addition of metal sheets in traditional processes. Moreover, the connection between the fiber composite material layer and the magnetic insert can be achieved by utilizing the chemical reaction between the resin encapsulating the magnetic material and the resin of the fiber composite material layer, eliminating the need for additional adhesive films or mechanical connectors.

The invention discloses a method for evaluating seawater resistance of a cyanate ester-based composite material for a structural material, and belongs to the field of material performance testing, and the method comprises the following steps: S1, preparing a sample plate of the cyanate ester-based composite material for seawater resistance testing, and cutting the sample plate into a sample sheet I, a sample sheet II and a sample sheet III; s2, soaking the sample piece I, the sample piece II and the sample piece III, and sampling and testing at different time nodes; s3, obtaining a fitting equation about the water absorption rate, the interlayer shear strength and the glass transition temperature; s4, converting into a long-time fitting equation; s5, calculating an evaluation score; s6, comparing the evaluation score S with the required score of the allowable value of the cyanate ester matrix composite to obtain an evaluation conclusion; the evaluation score is calculated through fitting equations corresponding to the water absorption rate, the interlaminar shear strength and the glass transition temperature, and the method is used for predicting the seawater resistance of the cyanate ester matrix composite for the structural material.

The present application relates to a kind of lightweight biomimetic discontinuous fiber spiral composite protective structure, belong to lightweight protective structure design technical field.The lightweight high-strength high-toughness biomimetic discontinuous fiber spiral composite protective structure of the present application is stacked by unit intermittent fiber fabric according to different arrangement angles and arrangement ways, under the condition of local stress concentration in relaxation layer, shear stress is distributed to the intermittent connecting part in each layer, the concentration of interlaminar shear stress is relieved, using the interlaminar shear stress distribution mechanism of the composite material makes crack frequently deflect when it bears load, can delay material failure and destruction, greatly improve the bearing and energy absorption capacity of the composite protective structure.

The application relates to the field of carbon fiber composites, and discloses a device for preparing a carbon fiber prepreg product and a carbon fiber product, wherein the device comprises a vacuum bag connected with a vacuum extraction assembly; the vacuum bag is internally provided with a product chamber and a fiber felt chamber which are in communication with each other; the carbon fiber prepreg product is arranged in the product chamber; and an activated carbon fiber felt assembly is arranged in the fiber felt chamber. The device can effectively reduce the porosity of the carbon fiber prepreg product and improve the bending strength and the interlaminar shear strength of the carbon fiber prepreg product.

This invention discloses a high-toughness, low-dielectric bismaleimide resin composition, a modified bismaleimide resin, its preparation method, and its applications. The bismaleimide resin composition comprises bismaleimide resin, an allyl compound, and a liquid rubber, wherein the liquid rubber contains end-capping groups capable of reacting with double bonds. This invention primarily addresses the problems of high dielectric constant, poor toughness, and poor interlaminar shear strength in existing bismaleimide resins. In this invention, the dielectric properties and toughness are improved by reacting the end-capping groups in the liquid rubber with the bismaleimide resin, while maintaining the mechanical properties and heat resistance essentially unchanged.

The application discloses an insect exoskeleton morphological layup composite panel, a sandwich structure and a preparation method. The sandwich structure comprises two pieces of bionic layup composite panels and a piece of aramid honeycomb core layer. The bionic layup composite panel draws lessons from the spiral stacking microstructure of the insect exoskeleton, the layup design considers the symmetry and balance requirements of the composite material, a fixed rotation angle is introduced between adjacent fiber layers, and the rotation angle is taken as a period of 180 degrees, and after a plurality of periods are laid and heat-pressed and cured, the bionic layup composite panel is obtained. The bionic layup design effectively reduces the interlaminar shear stress of the composite material, weakens the inherent anisotropy of the composite material, and improves the transverse bearing capacity and impact resistance. The bionic layup composite panel and the aramid honeycomb core layer have the advantages of high specific strength, high specific stiffness, impact energy absorption, vibration and noise reduction, electromagnetic shielding and the like, and a structure and function integrated material with more excellent comprehensive performance is obtained, and the structure and function integrated material is expected to be widely used in main load-bearing structures of various spacecrafts.

The present application relates to the field of nondestructive testing, and provides a composite laminated sheet interlaminar damage identification and failure determination method, comprising: collecting acoustic emission signals of a composite laminated sheet in a short beam shear test, and extracting amplitude intensity and peak frequency; classifying and identifying damage categories in an interlaminar shear failure process; calculating a relative cumulative count of acoustic emission signals of each damage, and synchronously calculating a load change increment, and constructing a relationship curve of both and time; determining a damage starting time according to an initial change feature point of the relationship curve relative to the cumulative count curve, and cooperatively determining an interlaminar shear failure point in combination with a mutation feature of the load increment curve, and outputting a failure point load value as a limit load of interlaminar shear strength. The present application also provides a device, equipment and medium applying the method. The present application effectively identifies damage modes and determines an interlaminar shear failure starting point, and accurately determines a shear strength of a laminated sheet.

The application relates to the technical field of carbon fiber preparation, and discloses a high-strength and high-modulus carbon fiber and a preparation method thereof. The method comprises pre-oxidation treatment of polyacrylonitrile-based original filaments; wherein the pre-oxidation treatment is provided with at least three temperature zones; in the first temperature zone, the ratio of the static value of the polyacrylonitrile-based original filament to the width of the polyacrylonitrile-based original filament is 0.005-0.032 V / mm. According to the method, the static value of the polyacrylonitrile-based original filament in the pre-oxidation process is controlled, high-strength and high-modulus carbon fibers are prepared, and the interlaminar shear strength of the composite material is high.

This invention discloses an auxiliary tooling and method for imidization molding of PMR type polyimide prepreg, belonging to the field of polyimide composite material molding technology. To solve the technical problems of severe resin loss, high porosity, and poor dimensional accuracy during the imidization process of PMR type polyimide prepreg, this invention employs a tooling consisting of a mold body, anti-overflow sealing and flow-limiting components, and a gradient pressing component. Combined with a four-stage gradient heating and segmented pressure control process, it utilizes the gap fit between edge flow-blocking bosses and limiting gaskets to achieve venting and flow control, and uses zoned elastic pressure blocks to construct a gradient pressure field to guide resin distribution. This invention can reduce the resin loss rate to 2%~8%, control the edge porosity of the product to within 1.0%, significantly improve the dimensional accuracy and interlaminar shear strength of the product, and meet the needs of large-scale industrial production of high-precision composite material components.

The application relates to a high-flame-retardant compensation cable and a preparation method thereof, and belongs to the technical field of cable preparation. The high-flame-retardant compensation cable comprises a conductor layer, a fire-resistant layer, a shielding layer and a sheath layer which are sequentially arranged from inside to outside, wherein the fire-resistant layer comprises an inner layer and an outer layer; the inner layer is a ceramicized silicone rubber composite tape which is wrapped around the outer surface of the conductor layer in a clockwise direction; the outer layer is a reinforced ceramicized tape which is wrapped around the outer surface of the inner layer in an anticlockwise direction; the wrapping overlap rates of the inner layer and the outer layer are both 20%-30%. The inner layer provides a bending buffer space with low tension, thereby avoiding stress concentration; the outer layer locks the inner layer with high tension, thereby forming a stress self-balancing structure with inner soft buffering and outer tight locking; the reverse winding direction makes the interlayer shear stress offset each other. The combined arrangement of the inner layer and the outer layer can effectively reduce the interlayer peeling risk after bending and significantly improve the fire resistance after bending.

This invention discloses a toughened emulsified asphalt with shear resistance and non-stick properties, and its preparation method. The emulsified asphalt is obtained by emulsifying composite asphalt and modified soap solution. The composite asphalt is obtained by shear extrusion of 70# base asphalt, 15# hard asphalt, active rubber powder, SBS modifier, water-soluble salt, and compatibilizer in a twin-screw extruder. This invention utilizes a twin-screw extruder to disperse active rubber powder, SBS modifier, and water-soluble salt in asphalt under the compatibilizing effect of the compatibilizer, forming a uniform composite asphalt, which significantly improves the interlaminar shear strength and low-temperature toughness of the emulsified asphalt. By dispersing water-soluble salt in the composite asphalt, when the composite asphalt is melted and emulsified with soap solution, the water-soluble salt dissolves rapidly, causing the agglomerated composite asphalt to quickly disperse into uniform, fine droplets, thereby obtaining a storage-stable emulsified asphalt. This overcomes the technical bottleneck of difficulty in dispersing and emulsifying rubber powder in the industry, reduces production costs, and improves production efficiency.

The method for synthesizing carbon nanowires on the surface of carbon fiber cloth comprises the following steps: growing metal organic framework material ZIF-67 on the surface of carbon fiber cloth, making ZIF-67 decompose and reduce through a chemical vapor deposition process to generate Co nanoparticles, and finally, successfully synthesizing carbon nanowires under the atmosphere of anhydrous ethanol as a carbon source. The carbon / carbon composite material is prepared by stacking the carbon cloth with carbon nanowires on the surface, and the interlaminar shear strength of the carbon / carbon composite material is increased by about 90% compared with that of the pure carbon cloth stacking. The anhydrous ethanol is used as a carbon source, and a more suitable growth atmosphere for the catalytic synthesis of carbon nanowires is created for Co catalyst particles; the synthesized carbon nanowires are uniform in size, high in purity, and uniformly dispersed on the surface of carbon fibers, and the method is simple, controllable, environmentally friendly, pollution-free, low in cost and suitable for industrial production.

The invention relates to the technical field of power battery bottom protection plates, and discloses a UHMWPE fiber reinforced epoxy resin composite material, a battery protection plate and a preparation method of the battery protection plate. The UHMWPE fiber reinforced epoxy resin composite material comprises an epoxy resin matrix and UHMWPE fiber cloth, and the UHMWPE fiber cloth accounts for 30-60 wt% of the total weight of the composite material. The UHMWPE fiber cloth is modified UHMWPE fiber cloth obtained by performing surface treatment on original UHMWPE fiber cloth through a plasma treatment technology; the epoxy resin in the epoxy resin matrix is bisphenol A epoxy resin. The composite material obtained by adopting the specific epoxy resin matrix and the plasma modified UHMWPE fiber cloth has the characteristics of high interlaminar shear strength, high impact strength, high tensile strength, high bending strength and small depth of the lowest point of a drop hammer impact sample, is very suitable for a battery protection plate, and has the characteristics of light weight and high strength.

The invention relates to the technical field of 3D printing prepreg tape manufacturing, and discloses a production method of a one-way prepreg tape material for aviation 3D printing, which comprises the following steps: conveying a material, melting and plasticizing a thermoplastic resin base material through a screw extruder, and extruding the thermoplastic resin base material from a die head in a continuous flow state, meanwhile, a plurality of reinforced fiber tows are uniformly arranged in the circumferential direction through a fiber guide device by utilizing an upstream fiber pay-off rack, a hollow tubular fiber structure is formed after the reinforced fiber tows enter from a fiber guide-in cover arranged at the upper end of the fiber guide device, and then internal filling is performed; and the extruded molten resin is guided into a central channel of a tubular fiber structure formed in the fiber guiding device. According to the production method of the one-way prepreg tape material for aviation 3D printing, the defects of dry fibers and pores caused by poor fluidity of high-viscosity resin in a traditional method can be fundamentally eliminated, and the interlayer shear strength and transverse tensile strength of the composite material are remarkably improved through an original forced permeation mechanism from inside to outside.

The invention relates to the technical field of rail transit, and discloses a non-metal composite rail system and a mechanical property detection method thereof.The non-metal composite rail system comprises a rail body made of multiple layers of fiber reinforced resin matrix composite materials, the tensile strength is larger than or equal to 1200 MPa, and the interlayer shear strength is larger than or equal to 45 MPa; the tolerance fit grade of a pre-tightening mortise and tenon joint is IT6, a male tenon and a female tenon are fixed through a high-strength composite material pre-tightening bolt, and the pre-tightening force is 50-100 kN; the thickness of the coating is 0.05-0.1 mm, and the friction coefficient mu is smaller than or equal to 0.08; and the embedded RFID information tracing module is used for storing manufacturing information and mechanical property parameters. The detection method comprises the steps of short beam shear test, tensile strength test, friction coefficient test and RFID data verification. The non-metal composite material improves corrosion resistance and prolongs the service life, the pre-tightening tenon-and-mortise interface improves connection stability, the self-lubricating sliding contact surface reduces maintenance requirements, the RFID module realizes full-life-cycle management, and the detection method improves quality control efficiency.

The invention relates to a magnetic induction curing fiber reinforced composite material as well as a preparation method and application thereof, and belongs to the technical field of fiber reinforced composite materials. In order to solve the problem of weak interlayer performance of the existing fiber reinforced resin-based composite material, the invention provides a method for magnetically inducing and curing the fiber reinforced composite material, which comprises the following steps of: preparing an electrostatic spinning fiber membrane containing nano magnetic powder as an interlayer, and paving the electrostatic spinning fiber membrane between prepreg or other fiber reinforced body layers to form a composite material blank; in the resin gel stage in the composite material curing process, a strong magnetic field is applied in the thickness direction, so that the magnetic particles in the interlayer film are oriented and arranged along the magnetic field direction to form a reinforced chain. The interlayer magnetic powder is induced to be directionally arranged through a magnetic field, an effective reinforcing structure is formed in the thickness direction of the composite material, and the interlayer shear strength and the layering resistance of the composite material are remarkably improved. The method is simple in process, remarkable in effect and suitable for manufacturing high-performance composite materials in the fields of aerospace, transportation and the like.

The application discloses a kind of improving interlaminar shear strength and weather resistance fiber metal laminates and preparation method, belong to composite material preparation field.The application constructs network flocculation nanostructure by improving titanium alloy plate surface treatment method, effectively enhances the interface bonding force of titanium alloy and resin-based fiber composite material.From short beam shear test, the interlaminar shear strength of fiber metal laminates manufactured by the method is increased by 23.6% compared with the sample without treatment on the surface of titanium alloy.After wet heat treatment, the sample manufactured by the method shows better weather resistance, and the interlaminar shear strength after treatment is 42% higher than that of the sample without treatment.The method can be widely applied to the manufacture of Ti / CFRP fiber metal laminates, the bonding of titanium alloy and resin-based fiber composite material, and has strong practical value.

The invention relates to the technical field of friction materials, in particular to Cd-doped ZIF-62, a preparation method of the Cd-doped ZIF-62, a Cd-doped ZIF-62 / PEEK composite material and a preparation method and application of the Cd-doped ZIF-62 / PEEK composite material. The invention provides a Cd-doped ZIF-62 which is used as a tribological functional filler and can be applied to a PEEK (Polyether Ether Ketone) material formed by FDM (Fused Deposition Molding). Cd heterojunctions are added to the Cd-doped ZIF-62, so that the melting point and shear strength of ZIF-62 particles are reduced, and when the Cd-doped ZIF-62 is used as a functional filler to be applied to a PEEK matrix, the Cd-doped ZIF-62 particles are easier to decompose due to interlayer shear when the Cd-doped ZIF-62 and bearing steel are subjected to opposite abrasion, so that an anti-friction effect is achieved, formation of a transfer film is promoted, and further anti-friction and anti-wear modification of the PEEK composite material is achieved.

The utility model discloses a corner connector of a photovoltaic frame and a photovoltaic assembly, and the corner connector of the photovoltaic frame comprises a corner connector base body which is provided with a first protruding part and a second protruding part which are perpendicular to each other; the two frames are arranged and arranged on the first protruding part and the second protruding part in a sleeving mode respectively. The nesting sleeve is arranged between the frame and the first protruding part, and the nesting sleeve is detachably connected with the first protruding part. According to the corner brace of the photovoltaic frame and the photovoltaic module provided by the invention, through a nesting and embedding mode, the interlayer shear strength of the composite frame at the assembly position is enhanced, and the problem that the interlayer shear effect of a full-yarn frame is relatively poor is solved.

The application discloses a carbon fiber surface modification method and modified carbon fiber. The carbon fiber surface modification method comprises the following steps: performing desizing treatment on carbon fiber, and then placing the carbon fiber in an aramid nanofiber electrophoresis solution with a concentration of 0.005wt%-0.1wt% to perform electrophoretic deposition, so as to preliminarily modify the carbon fiber; drying the preliminarily modified carbon fiber, and then immersing the carbon fiber in an MXene dispersion liquid to perform secondary modification, wherein the concentration of the MXene dispersion liquid is 0.05wt%-0.5wt%; and drying the secondarily modified carbon fiber, so that the surface modified carbon fiber is obtained. The aramid nanofiber and the MXene are used to cooperatively treat the carbon fiber, so that the interfacial bonding performance between the carbon fiber and resin can be effectively improved, the interlaminar shear strength of the composite material is improved, and the overall mechanical performance of the composite material is further improved.

The invention relates to the technical field of preparation of carbon / carbon composite materials, in particular to a carbon-carbon crucible and a preparation process thereof.The carbon-carbon crucible comprises a crucible body, the crucible body comprises crucible sides, crucible bottoms and transition areas between the crucible sides and the crucible bottoms, and each of the crucible bottoms, the transition areas and the crucible sides sequentially comprises an outer layer, at least one middle layer and an inner layer from outside to inside; each layer sequentially comprises a carbon cloth, a first net tire, a second net tire, a thickened carbon cloth and a thickened net tire from outside to inside, the carbon cloth and the first net tire are wound into a whole through the carbon fiber surface, the transition area comprises a left cambered surface and a right cambered surface which are symmetrically arranged, and through the layered structure design, the density gradient is optimized, and the risk of interface stripping is reduced. And meanwhile, the mechanical impact force in the needling process is effectively dispersed by introducing the thickness-supplementing carbon cloth and the thickness-supplementing net tire, and the body strength of the crucible is improved. Interlayer connection is enhanced through winding of the carbon cloth and the first net tire, the interlayer shear strength is improved, and therefore interlayer separation is effectively prevented.

The invention provides a surface treatment method and device for high-strength and high-modulus carbon fibers and application of the surface treatment method and device. The surface treatment method of the high-strength and high-modulus carbon fiber comprises the step of performing two-section type anodic oxidation electrochemical treatment on the high-strength and high-modulus carbon fiber. In the two-stage anodic oxidation, the current density of the first-stage anodic oxidation is larger than that of the second-stage anodic oxidation, the current density of the first-stage anodic oxidation is 200-320 mA / cm < 2 >, and the current density of the second-stage anodic oxidation is 50-200 mA / cm < 2 >. According to the method, the surface of the high-strength and high-modulus carbon fiber with the tensile modulus of 500-600 GPa is modified through two-section type anodic oxidation electrochemical surface treatment, the surface inertia of the high-strength and high-modulus carbon fiber is improved, and the composite material can obtain high interlaminar shear strength under the condition that the sacrifice tensile mechanical property is extremely low.

The invention discloses a preparation method of an aero-engine composite material fan blade in the technical field of composite material molding, and the preparation method comprises the following steps: S1, providing a carbon fiber reinforced epoxy resin prepreg and cutting to obtain a prepreg sheet; s2, after the blade paving mold is cleaned, the surface of the blade paving mold is coated with a release agent, and mold preparation is completed; and S3, a shape-following pressing mold matched with the molded surface of the upper surface of the blade is manufactured, and the shape-following pressing mold is subjected to layer laying and vacuum compaction and then is cured and formed. The T800-grade high-strength one-way and plain carbon fibers are selected as reinforcements and the high-temperature epoxy resin is selected as a matrix to prepare the prepreg, and the 1500D aramid fiber lines are adopted to carry out X-shaped Z-direction sewing on the laminated blade blank, so that the specific strength, the specific stiffness and the interlayer shear strength of the blade are effectively improved, the problem that a traditional laminated plate is easy to layer is solved, and the production efficiency is improved. And the requirements of light weight and high performance of the blade are met.

This invention relates to the field of structural strength analysis technology, specifically a method, equipment, medium, and product for strength assessment of hybrid fiber sandwich structures. The method assesses the microscopic heterogeneity of the glass fiber outer layer, functionalized core layer, and carbon fiber inner layer, and assigns differentiated representative volumetric element modeling strategies based on the heterogeneity level. It establishes two-phase representative volumetric elements for the fiber layers and three-phase representative volumetric elements for the functionalized core layer, extracting the equivalent stiffness tensor of each layer through homogenization calculations. Representative volumetric elements are established for the conductive adhesive layer, and the interlaminar equivalent shear stiffness is extracted. The equivalent stiffness of each layer and the interlaminar shear stiffness are assigned to the corresponding ply and interface elements of the macroscopic finite element model to solve for the ply stress under structural service loads. Strength and stability criteria are applied to the glass fiber outer layer, carbon fiber inner layer, and functionalized core layer for strength assessment, obtaining the safety margin and failure location of each ply. This improves the accuracy and reliability of multi-scale mechanical analysis of hybrid fiber sandwich structures.

The invention discloses a three-dimensional woven hydrogen storage bottle and a manufacturing method thereof, and relates to the technical field of hydrogen storage containers. The three-dimensional woven hydrogen storage bottle comprises an inner container and a three-dimensional woven reinforcing structure, wherein the three-dimensional woven reinforcing structure comprises a carbon fiber three-dimensional woven layer and a glass fiber three-dimensional woven layer which are sequentially coated on the outer surface of the inner container from inside to outside. According to the three-dimensional woven hydrogen storage bottle, the carbon fiber three-dimensional woven layer and the glass fiber three-dimensional woven layer are integrally formed by adopting a three-dimensional overall weaving technology, so that the interior and the interlayer of the reinforcing layer are interwoven and interlocked in a three-dimensional space through warp yarns, weft yarns and binding yarns, and a single continuum without a clear weak interface is formed; according to the structure, the layering damage mode of a traditional laminated structure is avoided, the interlayer shear strength is improved by 50% or above, the structural integrity and safety of the hydrogen storage bottle under the working conditions of extreme internal pressure, external impact and collision are enhanced, and the performance of the hydrogen storage bottle far exceeds that of a traditional winding technology under the same fiber consumption.