41 results about "Interlaminar shear" patented technology

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 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 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.

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 application discloses a kind of carbon fiber reinforced PPESK medical composite of layer design and preparation method thereof, the present application is impregnated by 10%-20% mass fraction of PPESK / NMP solution using desizing carbon fiber, multi-section gradient temperature drying and water washing or organic solvent purification, obtain low-impurity prepreg tape;Through quasi-isotropic [90° / ±45° / 0°] s layer design, the product obtained by combining 16MPa, 360 ℃ vacuum hot pressing molding realizes the matching with human bone mechanical property, and the bending modulus is adjusted from 143GPa to 32GPa, the bending strength reaches 489MPa, and the interlaminar shear strength is 44.2MPa.The beneficial effects of the present application are that the mechanical properties are precisely controlled through the layer structure, high strength, low modulus and high biological safety are considered, the process is stable and controllable, suitable for orthopedic load-bearing bone implant material, to provide high-performance, high-adaptability new composite material solution for bone implant device.

The present disclosure relates to a carbon fiber prepreg, a preparation method thereof, a carbon ceramic brake disc, and a vehicle, the carbon fiber prepreg comprising a plurality of carbon fiber bundle layers and net tire layers arranged alternately in layers; at least one of the carbon fiber bundle layers comprises one or more carbon fiber bundle groups, each of the carbon fiber bundle groups comprises a plurality of carbon fiber bundle segments arranged in a zigzag manner, and the included angle a between any two adjacent carbon fiber bundle segments is an acute angle. The carbon ceramic brake disc prepared by using the carbon fiber prepreg has high interlaminar shear strength and tensile strength.

This invention relates to epoxy resin matrices and their preparation methods, prepregs, and composite materials, belonging to the field of polymer materials technology. The epoxy resin matrix comprises, by weight, the following components: epoxy resin: 100 parts; cyano-containing polyethersulfone: 5-20 parts; carboxyl-terminated nitrile butadiene rubber: 5-20 parts. This invention introduces cyano-containing polyethersulfone and carboxyl-terminated nitrile butadiene rubber as composite toughening agents, resulting in a synergistic effect. The cyano groups in the cyano-containing polyethersulfone enhance the fiber-resin interface bonding, and its high-rigidity skeleton increases the matrix modulus; the carboxyl-terminated nitrile butadiene rubber forms a rubber phase in the matrix, absorbing energy through cavitation. The resulting composite material maintains high heat resistance (Tg≥120℃) while exhibiting a 0° tensile strength exceeding 2800 MPa and an interlaminar shear strength exceeding 88 MPa, demonstrating excellent comprehensive mechanical properties and suitability for high-end fields such as aerospace and new energy vehicles.

This invention relates to a method for integrated weaving of multilayer hollow tubular fabrics and the resulting composite fabric. The method involves online weaving to form a coaxially nested core layer, at least one intermediate layer, and a surface tubular skeleton. A first-stage heat treatment using core-sheath structure yarns achieves initial interlayer bonding. Subsequently, an ultrasonically treated zirconium salt solution is injected into the inner cavity and / or interlayer cavities. Under pressure, a programmed gradient temperature rise and electrolytic coupling process is used to reduce and oxidize zirconium ions in situ, generating highly dispersed nano-zirconia on the inner wall of the cavity and the surface of the Z-axis reinforcing fibers, which then tightly bonds with the fabric matrix. This method solves the problems of weak interlayer bonding and uneven dispersion of nanomaterials, achieving structural and functional integration. The resulting composite fabric exhibits high interlayer shear strength and excellent overall performance.

This invention discloses an embedded structure battery and its fabrication method. The fabrication method includes the following steps: arranging N layers of mesh fabric in a layered structure, forming through holes at the center for placing energy storage units to obtain a core layer; placing energy storage units into the through holes of the core layer to obtain a core layer structure; placing an upper skin on the upper surface of the core layer structure and a lower skin on the lower surface of the core layer structure to obtain a preform of the structure battery. Both the upper and lower skins include: a stretched fabric; impregnating the preform of the structure battery with a resin system using a vacuum-assisted resin transfer molding process, and curing to obtain the embedded structure battery. The stretched fabric has good interlayer shear properties, and the internal pores of the mesh fabric can dissipate energy through fiber sliding and pore compression. The stretched fabric and the mesh fabric work together to provide energy absorption, thereby protecting the energy storage units inside the core layer and improving the damage tolerance of the embedded structure battery.

This invention belongs to the field of composite materials and relates to a carbon fiber sizing agent, its preparation method, and its application. The carbon fiber sizing agent is an aqueous solution of lignin-based derived resin or a compound solution of an aqueous solution of lignin-based derived resin and a rigid nanoparticle sol; by mass ratio, the rigid nanoparticle sol : lignin-based derived resin aqueous solution = (0-6): 100. In this invention, the lignin-based derived resin provides good wettability and stress buffering, while the rigid nanoparticles form strong interactions with resin groups through surface oxygen vacancies, achieving uniform dispersion and interfacial anchoring. After treatment with the sizing agent, the surface roughness and chemical activity of the carbon fiber are significantly improved, and the interfacial bonding strength with the resin matrix is ​​greatly enhanced. The interlaminar shear strength, flexural strength, and tensile strength of the carbon fiber composite material are simultaneously improved. This invention has a simple process and is environmentally friendly. While maintaining the bulk properties of the carbon fiber, it achieves synergistic optimization of interfacial properties, and has significant engineering application value.

This invention discloses a gradual transition structure between the conical surface and the folded edge surface of a carbon fiber loudspeaker diaphragm and its manufacturing method, belonging to the field of electroacoustic technology. The structure includes a diaphragm formed by one-time hot pressing of carbon fiber prepreg. The diaphragm has a conical main body and a folded edge surface located at the outer edge of the conical main body. A gradual transition zone is provided between the conical main body and the folded edge surface. The thickness of the gradual transition zone linearly changes from the thickness of the conical main body to the thickness of the folded edge surface, with a transition length ≥30mm. The gradual transition zone achieves continuous thickness variation through ply cutting angle control, and the ply cutting edge is beveled. This invention also discloses a manufacturing method for this gradual transition structure, including ply design, bevel cutting, and hot pressing. By controlling the ply termination position and bevel cutting angle, the interlaminar shear stress is reduced from approximately 38MPa in traditional structures to approximately 15MPa, increasing the fatigue life of the diaphragm bending area by 3-5 times. This invention solves the problem of interlaminar delamination caused by abrupt thickness changes at the bending root of large-diameter loudspeaker diaphragms, significantly improving the structural integrity and long-term reliability of the diaphragm.

The application provides a hyperbranched end-amino sizing agent, a preparation method thereof and application thereof in high modulus composites. The preparation method of the hyperbranched end-amino sizing agent comprises the following steps: dissolving aromatic diamine in water, stirring until completely dissolved, adding alpha, beta-unsaturated carbonyl bifunctional monomer, and reacting; then adding long-chain aliphatic diamine to continue the reaction, separating to obtain end-amino polyamide, and preparing the end-amino sizing agent through phase inversion; impregnating and sizing carbon fibers by using the sizing agent; finally, coating high modulus epoxy resin and a curing agent on the sized carbon fibers, and hot pressing to form high modulus composites. The sizing agent has a hyperbranched structure, is rich in amide groups and long-chain aliphatic amino end groups, can form hydrogen bonds and chemical bonds with matrix resin, and can significantly improve the interfacial bonding force between the inert surface of high modulus carbon fibers and the resin. Tests show that the bending modulus and interlaminar shear strength of the composites are obviously improved.

The utility model discloses a high -strength anti -deformation laminated board relates to laminated board technical field, including resin base layer, the outside of resin base layer is provided with the carbon fiber reinforced layer that can promote the rigidity of laminated board strength, and is provided with interlayer reinforcing structure between carbon fiber reinforced layer and resin base layer, and the enhancement of laminated board is realized to the anti -fracture of preventing through interlayer reinforcing structure, and resin base layer and carbon fiber reinforced layer each are provided with two groups. The high -strength anti -deformation laminated board, when the preliminary pressing of multiple resin base layers and carbon fiber reinforced layer between is completed, can butt joint to butt joint and place the groove position of fixed plate to carry out the pressing treatment to the carbon fiber needle of Z -pinning technique, and the carbon fiber needle is inserted to the butt joint hole, and the resin base layer, carbon fiber reinforced layer between is further fixed, through the carbon fiber needle in the shear strength between reinforcing layers, the weight of carbon fiber needle is small, and the defect of weight increase when using metal needle to fix is made up.

This invention discloses a high-toughness, weather-resistant microporous elastomer polyurethane product, its molding method, and composition, belonging to the technical field of polyurethane functional materials. The composition of this invention comprises an isocyanate composite component and a multifunctional isocyanate reactive component. The isocyanate composite component includes isocyanate prepolymer, modified aromatic isocyanate, and alicyclic isocyanate. The multifunctional isocyanate reactive component contains a supported catalytic system and a microcapsule-encapsulated weather-resistant modification system. This invention also provides a polyurethane composite mixture obtained from this composition, and a moldless layer-by-layer molding method based on this mixture. The method involves controlling the coating layers to be stacked layer by layer within a viscous flow window, and utilizing the system's self-exothermic curing process. The resulting product has a density of 300–900 kg / m³, an interlaminar shear strength ≥3.8 MPa, a closed-cell rate ≥92%, and a mechanical property retention rate ≥90% within a wide temperature range of -30℃ to 80℃, exhibiting high toughness, weather resistance, and moldless molding adaptability.

The application relates to a 9-micron electrolytic copper foil preparation method applied to HDI, and polydithiopropanesulfonic acid sodium, hydroxyethyl cellulose and N-dimethylthioformamide propane acid sodium are used as composite additives to be added into an electrolyte to prepare the 9-micron electrolytic copper foil. The core breakthrough of the 9-micron electrolytic copper foil preparation method is that the 9-micron electrolytic copper foil still has excellent mechanical properties while being extremely thinned. The higher tensile strength and elongation rate of the 9-micron electrolytic copper foil can effectively resist interlayer shear force generated by thermal stress and resin flow in a multi-layer pressing process, so that the risk of pressing wrinkles and tearing is significantly reduced. The 9-micron electrolytic copper foil lays a flat and solid foundation for subsequent fine line manufacturing, and is a physical prerequisite for improving the yield and reliability of high-end HDI boards.

This invention discloses a carbon material, its preparation method, and its applications, belonging to the field of anode material technology. The carbon material includes: a carbon substrate and a reinforcing carbon layer covering at least a portion of the surface of the carbon substrate; the reinforcing carbon layer is composed of at least two stacked carbon coating layers with different lattice orientations, with adjacent carbon coating layers having different lattice orientations. In this invention, the preferred lattice orientations of adjacent carbon coating layers are different, causing cracks to deflect, branch, or stop propagating at the interlayer interface, significantly improving the fracture toughness of the carbon layer; this multi-orientation stacked structure can uniformly disperse the anisotropic stress generated by silicon volume expansion into interlayer shear strain, avoiding local stress concentration; simultaneously, the three-dimensional conductive network constructed by multi-orientation microcrystals overcomes the defects of single-orientation coating layers in terms of conductive anisotropy and insufficient rate performance, ultimately providing stronger and more uniform physical constraints for repeated silicon expansion.

This invention relates to a carbon fiber prepreg, a carbon fiber composite sheet, and a method for preparing the same, falling within the technical field of carbon fiber and its composite materials. The main technical solution is as follows: the method for preparing the carbon fiber prepreg includes the following steps: mixing 50-70 parts by weight of solid epoxy resin, 10-20 parts by weight of chopped fibers, 20-40 parts by weight of curing agent, and 1-5 parts by weight of coupling agent to obtain a resin matrix; preparing the resin matrix into a film of a predetermined thickness; and impregnating the carbon fiber with the film to obtain the carbon fiber prepreg. A designed detachable mold, combined with a corresponding molding process, is used to prepare carbon fiber composite sheets from the carbon fiber prepreg. This invention is mainly used to reduce the internal porosity of carbon fiber composite sheets, improve interlaminar shear and in-plane shear properties, and enhance the appearance quality of the carbon fiber composite sheets.

The utility model discloses a kind of waterborne polyurethane mortar super wear-resistant floor, its including base layer, the waterproof layer is provided on the top of base layer, the heat-resistant layer is provided on the top of waterproof layer, the compression-resistant layer is provided on the top of heat-resistant layer, the wear-resistant layer is provided on the top of compression-resistant layer, this kind of waterborne polyurethane mortar super wear-resistant floor, hexagonal boss is pressed on the surface of butyl rubber coiled material, clearance is formed between adjacent boss, allow waterproof layer to produce transverse displacement when thermal expansion, absorb interlayer shear stress, avoid the peeling damage of bonding interface, secondly, surface engraves radiation water guide groove, PTFE coating is sprayed in groove, improve drainage flow rate, cooperate with anti-skid particle to form drainage anti-skid composite function, improve floor friction coefficient in rainy day, aluminum sheet is embedded in silicon carbide heat-resistant layer, utilize the high thermal conductivity of aluminum to quickly transfer surface heat to base layer, reduce floor surface temperature.

The present application relates to a kind of carbon fiber online surface treatment and impregnation device and preparation method.The device is made of carbon fiber desizing unit, sizing unit, impregnation unit and winding unit, can be used for preparing wet carbon fiber reinforced polyimide prepreg, and before carbon fiber impregnation, carbon fiber can be desized and resized according to the functional needs.The device can realize the integration of carbon fiber surface treatment and impregnation function in the preparation process of carbon fiber reinforced polyimide prepreg, so as to solve the poor interfacial bonding force of composite caused by the insufficient temperature resistance of commercial carbon fiber sizing agent and the fiber damage problem in the process of carbon fiber treatment.The carbon fiber reinforced polyimide prepreg prepared by the device shows better interlaminar shear performance and comprehensive mechanical properties.

The present application relates to a kind of carbon fiber composite board, including carbon fiber resin board, carbon fiber resin board includes energy-absorbing layer, reinforcing layer, the surface of energy-absorbing layer has filamentous protrusion, the filamentous protrusion of energy-absorbing layer is entangled with reinforcing layer, energy-absorbing layer, reinforcing layer include resin, carbon fiber.A kind of method for preparing carbon fiber resin board, including forming energy-absorbing layer, heating the surface of energy-absorbing layer so that the surface is fused, the fused surface is laminated on metal plate, then the metal plate is lifted up and peeled off to make the surface of energy-absorbing layer form filamentous protrusion, carbon fiber is attached to the surface of the energy-absorbing layer with filamentous protrusion and is spun, prepolymer is immersed carbon fiber and is cured to form reinforcing layer.The carbon fiber composite board prepared by the present application has excellent mechanical properties, especially has strong interlaminar shear strength, and can be widely used in mechanical, transportation tools, chemical devices and other fields.