625 results about "Thermoplastic composites" patented technology

The invention relates to the technical field of composite material detection, in particular to a fiber-reinforced thermosetting thermoplastic composite structure interface quality detection method and system.The method comprises the steps that vibration excitation is applied to a target area of the surface of a to-be-detected sample, and the amplitude of the excitation is lower than the damage critical value of a weak bonding interface; a dynamic response signal perpendicular to the interface is collected in a vibration field non-diffusion area of the excitation point of the target area; performing frequency domain transformation on the dynamic response signal, and separating a fundamental frequency component and at least one high-order harmonic frequency component; according to the nonlinear enhancement effect of the high-order harmonic frequency component relative to the fundamental wave frequency component, whether the weak bonding defect exists in the target area or not is judged. According to the method, the technical bottleneck that the dynamic evolution process of the weak bonding defect of the composite material interface is difficult to capture in real time is effectively solved, sensitive response to the microdefect is realized through a nonlinear harmonic characteristic enhancement effect, and the recognition precision of traditional ultrasonic detection is improved.

The invention belongs to the technical field of high-performance composite materials, and discloses a carbon fiber reinforced thermoplastic composite material performance database, a construction method and application thereof, and the method comprises the following steps: S1, database structure construction; s2, experimental sample collection and data standardization; s3, feature engineering and variable reduction; s4, training a machine learning model; s5, constructing and verifying an adaptive model; and S6, data expansion and feedback optimization. According to the method, material performance prediction and formula parameter reverse design under target performance are realized through systematic acquisition and normalization processing of three types of data of material components, preparation process and performance characterization and building of a nonlinear mapping model among a material structure, a process and performance through a machine learning method. The database can be used for intelligently recommending a high-performance composite material combination scheme, is suitable for rapid screening and customized development of various thermoplastic composite materials, effectively reduces the research and development cost and development cycle, and improves the material design efficiency.

The invention discloses a thermoplastic composite material T-shaped rib forming mold and a using method thereof, and belongs to the technical field of T-shaped rib forming machining. The thermoplastic composite material T-shaped rib forming mold comprises an L-shaped piece shaping mold and a T-shaped rib curing mold; the L-shaped piece shaping mold comprises a shaping mold side pressing block, a shaping mold rectangular block is arranged on one side of the shaping mold side pressing block, a shaping mold upper pressing block is arranged above the shaping mold rectangular block, and the shaping mold upper pressing block is vertically connected to the shaping mold side pressing block in a sliding mode. The T-shaped rib is decomposed into the two L-shaped pieces, the flat plate and the plug, the L-shaped pieces are subjected to hot-pressing shaping through the L-shaped piece shaping mold, the multiple layers of thermoplastic prepregs only need to be laid and fixed to the shaping mold in order according to the laying sequence, layer-by-layer welding is not needed, and the manufacturing period is shortened.

The invention discloses a composite material performance prediction method based on multi-field coupling multi-scale analysis and a knowledge graph, which integrates microstructure modeling, graph neural network representation learning, cross-scale parameter coupling modeling and robust optimization analysis. The method is suitable for prediction and design of key mechanical properties such as modulus, strength and toughness of a thermosetting / thermoplastic composite material under different working conditions. The method comprises the following steps: firstly, constructing a grain-level tissue knowledge graph based on an electron backscatter diffraction image, secondly, constructing a multi-scale input system comprising a microscopic variable (such as a fiber volume fraction), a mesoscopic variable (such as a layer thickness sequence) and a macroscopic variable (such as a load condition), and finally, performing robust optimization by utilizing a multi-objective evolutionary algorithm to obtain a multi-scale input system. And outputting a material performance prediction result and a knowledge graph associated with the ji structure-process-performance. According to the method, the accuracy and interpretability of performance prediction of the composite material can be remarkably improved, and data-knowledge dual-drive support is provided for design optimization of the high-performance composite material.

The invention discloses a continuous fiber reinforced thermoplastic composite material and a preparation method thereof. The continuous fiber reinforced thermoplastic composite material comprises 35-40% of a polypropylene matrix with a melt index of 10-30 g / 10 min; 55% of continuous fibers are selected from glass fibers, carbon fibers or basalt fibers which are arranged in one direction, and the monofilament diameter is 9-15 microns; the intumescent flame retardant and the ammonium polyphosphate are compounded according to the mass ratio of 2: 1; 1-2% of an interface modifier, wherein a silane coupling agent KH-570 or PP-g-MAH is selected and used; the roughness Ra of the aluminum foil layer is 1.5-2.5 microns; under the condition of basically ensuring that the overall performance of the material is not greatly influenced, the application capability of the material is expanded, and the fireproof and flame-retardant capability of the material is improved, so that a thermoplastic composite material scheme can also be adopted under various harsh use conditions.

The invention belongs to the technical field of guide mechanisms, and provides a belt width guide mechanism for a thermoplastic composite material, which comprises an equipment main body, a tray, at least one guide wheel, a filament guide plate and a filament bundle outlet, the charging tray, the guide wheel, the tow guide plate and the tow outlet are all detachably connected to the equipment body, and the charging tray is used for winding a composite tow band; the guide wheel is rotationally connected to the equipment main body and is provided with a first guide groove with a preset width; the wire guide plate is provided with a second guide groove with a preset width; the tow outlet is provided with a third guide groove with a preset width; one end of the composite material tow band is fixedly connected to the material disc and sequentially penetrates through the first guide groove, the second guide groove and the third guide groove, the other end of the composite material tow band is used for being connected with the pressing roller, and the central axis of the second guide groove and the axial direction of the third guide groove are both tangent to the peripheral contour of the pressing roller. The composite material tow band feeding device can position and guide the composite material tow band, and is convenient to replace and install to adapt to feeding of tow bands with different widths.

The invention belongs to the technical field of thermoplastic composite material ultrasonic welding, and particularly relates to a fabric fiber reinforced thermoplastic composite material energy-conducting-rib-free type continuous ultrasonic welding method which comprises the following steps: S1, cleaning the surface of a to-be-welded part of a fabric fiber reinforced thermoplastic composite material; s2, a workpiece to be welded is fixed to an anvil; s3, selecting an ultrasonic welding head; s4, the initial positions of the pre-pressing structure and the pressure maintaining structure are adjusted; s5, the moving path of the mechanical arm is planned, the posture of the mechanical arm is controlled, and the moving speed of the mechanical arm is set; s6, ultrasonic welding parameters are set; s7, the mechanical arm drives the ultrasonic welding head, the pre-pressing structure and the pressure maintaining structure to move downwards; and S8, the mechanical arm drives the ultrasonic welding head, the pre-pressing structure and the pressure maintaining structure to conduct continuous ultrasonic welding according to the set welding path and welding parameters, and after ultrasonic welding is completed, a power source is turned off. According to the invention, high-quality and high-efficiency connection of the composite material is realized.

The invention belongs to the technical field of uncertainty probability characterization analysis, and discloses a thermoplastic composite material leading edge structure design allowable value probability characterization method and system under a small sample condition, and the method comprises the steps: defining a plurality of candidate probability distribution models; fitting each model based on the original sample data and calculating an AIC value and a BIC value; a dynamic weight factor alpha is calculated according to the sample size n, and then a hybrid information criterion HIC value is calculated; generating a plurality of sample sets through Bootstrap self-service sampling, recalculating the HIC value on each sample set, and counting the selected optimal frequency of each model; and determining an optimal probability distribution model according to the frequency, wherein the optimal probability distribution model is used for representing a design allowable value. According to the method, the dynamic weight factor alpha is introduced, AIC and BIC criteria are effectively unified, optimal balance between prediction precision and model complexity is achieved under the condition of small samples, and engineering practicability and robustness are remarkably improved.

The invention discloses a fiber-reinforced thermoplastic resin-based composite material based on dynamic reversible interface interaction and a preparation method and a recycling method thereof. The fiber-reinforced thermoplastic resin-based composite material comprises a modified thermoplastic resin matrix and a modified fiber reinforcement which are compounded with each other, the modified thermoplastic resin matrix and the modified fiber reinforcement are bonded and connected through dynamic bonds with dynamic reversible interface interaction. Through construction of dynamic reversible interface interaction in the fiber-reinforced thermoplastic resin-based composite material, infiltration compounding and interface bonding between a fiber reinforcement and a high-viscosity thermoplastic resin melt can be enhanced, and interface debonding and total-value recycling of the fiber reinforcement in the composite material recycling process can be effectively promoted; therefore, the bottleneck problems of poor wettability in the forming process, low bonding fastness at a heterogeneous interface, insufficient mechanical properties, low waste recovery value and the like confronted by the development of the fiber-reinforced thermoplastic composite material are effectively solved.

The invention relates to the technical field of sheet conveying production, in particular to a continuous fiber reinforced thermoplastic composite sheet conveying production line which comprises two conveying frames, a conveying belt is arranged between the two conveying frames, and fixing plates are fixedly connected to the left portions of the upper ends of the two conveying frames. The upper ends of the two fixing plates are jointly and fixedly connected with a top plate. According to the continuous fiber reinforced thermoplastic composite sheet conveying production line, the continuous fiber reinforced thermoplastic composite sheet is extruded through the pressing rollers, bubbles possibly generated in the composite sheet in the thermoplastic process can be reduced, and therefore the compactness and structural integrity of the composite sheet are improved; and a spring is arranged in the extrusion mechanism, so that self-adaptive pressing of the composite sheets with different thicknesses can be realized, the equipment can quickly switch corresponding cold source or heat source types according to the materials, thicknesses or process requirements of the different composite sheets, and the adaptability of the production line to diversified production requirements is enhanced.

Embodiments relate to an enhanced method for building walls by primarily reducing the time for assembly. The design is for a molded multi-segment plastic composite construction block that interlocks horizontally, vertically and orthogonally with a clearance-fit, does not require mortar for structural integrity and is self-aligning. The blocks are molded out of natural-fiber reinforced thermoplastic composites with thermal expansion coefficient less than 0.0002 per degree Celsius and compression strength greater than 60 MPa.

The disclosure describes a device, method, and transfer apparatus for stamping thermoplastic composite blanks. The blanks may consist of laminated fibrous plies which may comprise continuous fibers in a thermoplastic polymer matrix. Supporting unidirectional fibers or holding tapes, pre-impregnated with polymer and extending beyond a shaping area's edges may be clamped in jaws, allowing the blank to be suspended and heated without sagging. The transfer system moves the blank between a heating station and a stamping station, where a punch and die may shape it while maintaining calibrated tension to reduce defects such as creasing or delamination. Advanced jaw mechanisms, including pivoting jaws with multiple clamping slots, enable differential tensioning of plies for precise forming of complex geometries. After stamping, excess fiber extensions may be trimmed and may be recycled. This approach eliminates the need for nonrecyclable polyimide films and improves process reliability for thick or heavy blanks.

In a method of using ultrasonic welding for fusion bonding of thermoplastic composites, an energy director is formed in place on a first thermoplastic substrate. The energy director can be protrusions arranged in a grid pattern over the entire weld region. The energy director can have protrusions of varying thicknesses to account for unevenness along the weld interface. Forming the energy director can be carried out by placing thermoplastic film on the first thermoplastic substrate, melting the thermoplastic film, and stamping the thermoplastic film with an energy director stamp. After the energy director is formed, the first thermoplastic substrate is ultrasonically welded to a second thermoplastic substrate with the energy director sandwiched between the first and second thermoplastic substrates.

The invention belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber reinforced thermoplastic composite prepreg and a preparation method thereof. According to the carbon fiber reinforced thermoplastic composite prepreg prepared by the preparation method disclosed by the invention, a layer of carbon fiber fabric and thermoplastic resin films on two sides of the carbon fiber fabric form a laminated structure, and the carbon fiber fabric is modified, so that polydopamine films are formed on two sides of the carbon fiber fabric through impregnation. Through heating, pressurizing and ultrasonic vibration of the laminated structure, resin in the thermoplastic resin film is softened and melted, flows in the laminating direction and is mechanically interlocked with the carbon fiber fabric through part of polydopamine, meanwhile, the carbon fiber fabric is infiltrated by the resin, and the thermoplastic resin and the carbon fibers are uniformly distributed. Therefore, the carbon fiber can be relatively difficultly stripped from the thermoplastic resin, the bonding strength of the composite material can be improved, and the process for preparing the fiber-reinforced thermoplastic composite material prepreg by the method has the advantages of high efficiency and batch production.

The invention provides a middle-sized unmanned aerial vehicle structure and function integrated grating oil tank capable of being automatically and integrally formed and a forming method, and relates to the field of unmanned aerial vehicle structure design. The oil tank body is formed by integral compression molding of an upper skin and a lower skin, the grating separation layer is co-cured with the skins through insert injection molding by chopped carbon fiber reinforced thermoplastic resin to form honeycomb grids, and the oil inlet and outlet connector is an aluminum alloy flange and is fixed to the bottom of the oil tank through welding of aluminum alloy and thermoplastic composite materials. Based on the long and short fiber mixed integrated oil tank design and process technology, full-automatic integrated forming of the main bearing shell can be achieved, the oil tank skin guarantees the bearing capacity through the long continuous fiber composite material, the oil tank grating is made of the chopped fiber composite material, and the functions of sequential oil supply, overload resistance, shaking prevention and the like are achieved; and the number of oil tank parts is greatly reduced, and the potential of full-automatic manufacturing is achieved.

The invention provides a preparation method of a thermoplastic resin suspension liquid for pulping-free impregnation of large-tow carbon fibers, and belongs to the field of production of thermoplastic composite materials. The suspension comprises thermoplastic resin powder, a surfactant, a functional additive and an organic solvent aqueous solution; wherein the mass ratio of a solid component to a liquid component in the suspension is 1: (2-10). The preparation method comprises the following steps: adding the surfactant and the functional additive into an aqueous solution of an organic solvent, and adjusting the pH value of the mixed solution to 6-10; then adding thermoplastic resin powder, and stirring to obtain a thermoplastic resin suspension; the prepared thermoplastic resin suspension is used for impregnating large-tow fibers to prepare the thermoplastic resin-based large-tow fiber prepreg. The suspension is good in standing stability, raw materials are easy to obtain, a composite material can be rapidly formed without surface sizing agent pretreatment removal of large-tow fibers, and the obtained composite fibers are good in mechanical property.

The invention provides a sizing carbon fiber as well as a preparation method and application thereof. The sizing carbon fiber comprises a carbon fiber tow and a polyimide sizing agent loaded on the surface of the carbon fiber tow, the polyimide sizing agent has a structural unit shown as a formula I. Polyimide with the same ether ketone structure as the polyaryletherketone resin is adopted as a sizing agent, so that the carbon fibers and the polyaryletherketone resin form firm interface bonding more easily, and sufficient infiltration of the polyaryletherketone resin on the carbon fibers in the automatic laying process is facilitated; the internal defects of the composite material obtained through automatic laying forming are reduced, and the mechanical property of the composite material is improved; and the polyimide sizing agent has good temperature resistance and is suitable for preparing a carbon fiber reinforced high-performance thermoplastic composite material.

The utility model discloses a thermoplastic composite material component laying device. The thermoplastic composite material component laying device comprises a movement system and a laying execution mechanism, the laying execution mechanism comprises a tension unwinding mechanism, a rolling mechanism and a heater; thermoplastic prepreg tows are output and laid by the tension unwinding mechanism according to certain guidance, the output thermoplastic prepreg tows are heated by the heater, and the laid thermoplastic prepreg tows are rolled and solidified by the rolling mechanism to form a thermoplastic composite component; the laying execution mechanism is connected with the motion system, and the laying execution mechanism is driven by the motion system to do multi-degree-of-freedom motion. The device has high action flexibility and high efficiency, and can realize high-efficiency and high-precision laying and forming work.

The invention relates to the technical field of thermoplastic composite material welding, in particular to a composite material continuous ultrasonic welding method based on an interface microstructure, which comprises the following steps: carrying out positioning treatment on the surface of a thermoplastic composite material to be welded, and selecting welding parameters according to the property of the thermoplastic composite material to be welded; a microstructure texture is introduced into a to-be-welded interface of the thermoplastic composite material, and the microstructure texture has parameterized geometric properties; a flexible and continuous energy conduction item is arranged between the microstructure texture and the substrate on the opposite side, and molten resin is in a super-infiltration state in the initial welding stage through the ultrasonic vibration effect; and welding is completed under the set welding parameter condition. The welding performance of the thermoplastic composite material is improved, and a feasible technical path is provided for rapid assembly of complex structures in the future.

The invention discloses a forming mold and a preparation method of a surface reinforced thermoplastic composite material, and belongs to the field of high-performance thermoplastic composite material manufacturing, the forming mold comprises an upper mold, a lower mold and a frame; a plane boss is arranged at the bottom of the upper die, a reinforcing rib boss is detachably arranged at the bottom of the plane boss, and transverse lugs used for being locked by a locking mechanism are arranged on the two sides of the plane boss and the reinforcing rib boss respectively. The upper die and the lower die are matched through a frame, and the side face of the lower die is provided with a temperature detection hole used for containing a thermocouple. The surface reinforced thermoplastic composite material with excellent interface performance, dimensional stability and impact resistance can be prepared, the excellent mechanical property of a continuous fiber reinforced composite material and the manufacturing flexibility of a long fiber reinforced composite material can be integrated, and the surface reinforced thermoplastic composite material has a wide application scene.

The invention discloses a continuous ultrasonic welding method based on cooperation of a bionic interlocking microstructure and an energy conduction item. The continuous ultrasonic welding method comprises the following steps: cleaning a to-be-welded surface of a thermoplastic composite material workpiece; the method comprises the following steps: preparing a dual-scale bionic interlocking microstructure with a micron-scale circular convex claw-shaped array and a nano groove on the surface of a workpiece; a microstructure with the specific geometrical morphology is arranged on the surface of the other workpiece; carrying out microstructure etching on the energy conduction item, placing the microstructure energy conduction item between two workpieces, and applying vibration and pressure through a continuously moving ultrasonic welding head after butt joint, so that the interface resin is molten and filled into the bionic microstructure; and a mechanical interlocking interface is formed after pressure maintaining and cooling. Through collaborative design of the bionic microstructure and the energy conduction item, the interface bonding strength is remarkably improved, the problems of uneven energy, weak bonding and the like in traditional welding are solved, and the method is suitable for high-quality connection and repair of composite material components in the fields of aerospace, automobiles and the like.

Typical commercial surface treatments for continuous carbon fibers are often unavailable for discontinuous fibers. As such, there is little variety of chopped fiber surfaces leading to non-ideal coating solutions which result in poor interfacial compatibility between fibers and a composite matrix. A method of applying a highly effective coating using a high throughput technique for chopped carbon fibers. The method provides the ability to tune both the coating thickness and chemical functionality using processing parameters. The coatings are evaluated using X-ray photoelectron spectroscopy (XPS) for uniformity and composition. Using this technique, thermoplastic composites are highlighted showing an increase in interfacial shear strength (IFSS) of 25 MPa. This process shows promise for increasing the throughput of surface treatment of chopped fiber on the industrial scale.

The present invention relates to a method and device for ultrasonic additive manufacturing of thermoplastic composite materials. The method comprises: applying a certain pressure, and applying ultrasonic vibration as an energy input, to act jointly at an interface between two layers of thermoplastic composite materials of a workpiece; converting mechanical energy into internal energy to heat the interface between the thermoplastic composite materials in an extremely short period of time; tightly bonding the two layers of composite materials by means of an additive manufacturing method that carries out melting under the action of thermo-mechanical coupling to form a strong bond by means of molecular diffusion; and repeating the process above, such that each layer of composite material is bonded to the previous layer by means of ultrasonic vibration, thereby realizing layer-by-layer additive manufacturing of thermoplastic composite materials of the workpiece. On this basis, the preparation of parts having complex contour profiles by ultrasonic additive manufacturing is realized by means of various contours of molds. The present invention realizes additive manufacturing of complex contour profiles by controlling the translation of an ultrasonic additive manufacturing tool head and the rotation of materials. The present invention has the characteristics of good continuity, high additive manufacturing speed, high additive manufacturing energy and uniform energy.

Embodiments of a co-molded putter-type golf club head comprising a high-density chassis made of a first material and a low-density putter-type body made of a second material. The first material can be a high density metal (i.e., steel or tungsten, but not limited to). The second material can be a low density thermoplastic composite (i.e., polyphenylene sulfide (PPS), polyamide (PA), but not limited to). The chassis comprises a flow aperture, and one or more interlocking features. The putter-type body portion encases the entirety of the at least one interlocking feature. Further, the putter-type body encapsulates the chassis such that the body extends through, and completely fills the flow aperture, to interlock the body and chassis, and thus form the club head. Other embodiments may be described and claimed.

The invention discloses an upper cover structure and application of the upper cover structure to a new energy automobile battery box. The upper cover structure is made of a continuous glass fiber reinforced PPS thermoplastic composite material. The top surface of the upper cover structure adopts a thin wall of which the thickness is less than or equal to 2.00 mm; radial reinforcing ribs are arranged on the upper cover structure; the flange edge of the upper cover structure is welded with a reinforcing strip through vibration friction; the upper cover structure is applied to the new energy automobile battery box. According to the upper cover structure and the application of the upper cover structure to the battery box of the new energy automobile, the novel battery box upper cover structure which can meet multiple requirements of light weight, high strength, high production efficiency, environmental protection, recyclability, thermal runaway safety performance and the like at the same time is provided through innovation of materials, structures and processes, and the upper cover structure has wide application prospects.

The present invention relates to a high-temperature-resistant thermoplastic water-based composite sizing agent for carbon fibers and its preparation method. The sizing agent comprises amino-polyetherketoneketone, carboxylated carbon nanotubes, and deionized water. Compared with the prior art, the sizing agent of the present invention is a composite water-based sizing agent that does not contain any other additives and is environmentally friendly. Furthermore, this sizing agent addresses the issues of existing sizing agents being heat-resistant and unsuitable for carbon fiber-reinforced high-performance thermoplastic composites, significantly improving the interfacial bonding strength of carbon fiber-reinforced high-performance thermoplastic resin-based composites.

The invention provides a thermoplastic composite material ultrasonic welding method and welding device based on material physical properties, and the thermoplastic composite material ultrasonic welding method based on material physical properties comprises the following steps: arranging thermoplastic composite material layers on to-be-welded surfaces of a first thermoplastic composite material part and a second thermoplastic composite material part, wherein the melting point of the thermoplastic composite material layer is lower than that of the first thermoplastic composite material part and that of the second thermoplastic composite material part; the welding areas of the first thermoplastic composite material part and the second thermoplastic material part are fixed in a lap joint mode, an energy conduction item is arranged between the first thermoplastic composite material part and the second thermoplastic material part, and ultrasonic welding is conducted on the welding areas; and after ultrasonic welding is completed, pressure is applied to the welding area till the welding area is cooled to the room temperature, and solidification is completed. Ultrasonic welding can be completed under the condition that the surface quality of the workpiece is guaranteed, the appearance and internal quality of the workpiece are guaranteed, and high-quality welding of the thermoplastic composite workpiece is achieved.

The invention relates to composite repair. A method for repairing a thermoplastic composite part is presented. A heating element impregnated with a thermoplastic material is placed onto the repair area of the thermoplastic composite part. The thermoplastic material of the heating element is adhered to the repair area by generating heat in the heating element from an electrical current applied to the heating element. After the heating element is adhered to the repair area, a repair patch is placed on the heating element. A current is applied to the heating element to heat the repair patch to a patch processing temperature.

The invention provides a forming method for a curved frame component of an aircraft made of a thermoplastic composite material, which comprises the following steps: S1, based on a mathematical model of the curved frame component, laying the thermoplastic composite material through an automatic fiber laying process to form a preformed body flat plate; s2, the preformed body flat plate is cut to the preformed body size required by mold pressing along the laid positioning tows; and S3, the preformed body flat plate is subjected to mold pressing through a hot mold pressing process to form the curved frame component in a preset shape. According to the scheme, the thermoplastic composite material preform flat plate is prepared by adopting an automatic fiber placement process, so that automatic and accurate positioning of fibers can be realized, and interlayer bonding stability can be realized through high-energy laser heating. In addition, the material sheets can be accurately positioned through the hot mold pressing process, and therefore rapid mold pressing forming of parts with complex characteristics is achieved.

Provided is a method to form a thermoplastic composite with electrically and thermally conductive constituents. The method may include receiving a molten rod having a polymer composite core. The method may further include embedding the rod with at least one conductive wire. Embedding the rod with the at least one wire may include wrapping the at least one conductive wire around the rod and tensioning the wire thereby causing the wire to at least partially embed into the rod.