38 results about "Vectran" patented technology

The invention discloses a carbon fiber fuselage structure layering optimization design method and system, and relates to the technical field of material structure intelligent design, and the method comprises the steps: importing a three-dimensional CAD model of a fuselage structure, collecting physical field input parameters, integrating and generating a digital engineering package, and carrying out the temperature field calculation through a thermal coupling solver based on the digital engineering package, the method comprises the following steps: acquiring temperature distribution of a fuselage, mapping the temperature distribution of the fuselage into a thermal stress field through a thermoelastic constitutive equation, performing vector superposition on the thermal stress field and a mechanical load to generate a comprehensive stress cloud picture, starting asymmetric layering design for a high-stress region based on the comprehensive stress cloud picture, and verifying mechanical balance of layering angle combination through a balance optimization algorithm. And obtaining a layering optimization scheme. The thermal deformation sensitivity is accurately evaluated by using the thermal-mechanical coupling solver and the finite element disturbance analysis method, and thermal deformation can be effectively predicted and controlled, so that the dimensional stability and the surface quality of a final product are improved.

The invention relates to the technical field of high polymer material ingredients, and discloses a low-linear expansion coefficient PCR-PP bumper material and a preparation method thereof.The low-linear expansion coefficient PCR-PP bumper material comprises a low-expansion inorganic core, an interface gradient coupling agent and a surface activity modifier, the interface gradient coupling agent forms a brush-like topology grafting layer with the grafting rate of 2.5%-4.5% on the surface of the low-expansion inorganic core, and the surface activity modifier forms a brush-like topology grafting layer with the grafting rate of 2.5%-4.5% on the surface of the low-expansion inorganic core; the surface activity regulator performs steric hindrance locking on the brush-like topological grafting layer through long-chain alkyl of the surface activity regulator. According to the preparation method, a gradient distribution interface layer with specific grafting density and chain segment length is constructed on the periphery of an inorganic core, so that an interface chain segment actively absorbs thermal expansion displacement of a matrix by utilizing conformation transformation; the thermal stress vector discontinuity between the filler and the matrix is eliminated, and an interface mechanical response mode is reconstructed to inhibit interface delamination and microcrack initiation while the overall linear expansion coefficient is inhibited.

The invention discloses a resin-glass fiber coupling flow simulation test method which comprises the following steps: acquiring rheological characteristic parameters of resin and physical characteristic parameters of glass fiber, and measuring interface characteristic parameters; defining a plurality of glass fibers as equivalent fiber bundle flow units, and calculating physical characteristic parameters of the equivalent fiber bundle flow units; constructing a resin flow field model, and performing multi-scale simulation on the movement of the equivalent fiber bundle flow unit; constructing a motion equation of the equivalent fiber bundle flow unit, and outputting a motion velocity vector; and constructing a control equation of the resin flow field, outputting the distribution density of local equivalent fiber bundle flow units at different positions in the coupling flow process of the equivalent fiber bundle flow units and the resin flow field model, and further simulating the distribution density condition of the glass fibers when the glass fibers and the resin are mixed and flow under different conditions. The effect of mixed flowing of glass fibers and resin in different shapes is simulated, and effective guidance is provided for optimization of a composite material forming process.

The present invention relates to the field of intelligent weaving technology, specifically a three-dimensional weaving active control method and system for eliminating local wrinkles in fabrics, the method comprising the following steps: obtaining a core mold centerline based on the core shaft surface, and obtaining a core mold surface triangular patch in combination with the core mold centerline and the outer contour; dividing the core mold surface triangular patch based on the product's expected weaving angle distribution and obtaining the expected weaving angle direction vector; obtaining the expected yarn trajectory based on the expected weaving angle direction vector and fabric uniformity; analyzing any discrete point on the core mold centerline based on the expected yarn trajectory and a guide ring, and obtaining a first control parameter result and a second control parameter result for the discrete point. The present invention accurately solves the control parameters based on the uniformity of yarn distribution and the interaction between yarns to ensure the continuity and stability of weaving, thereby ensuring the weaving accuracy of large-scale complex structure core molds.

The present application relates to a kind of alignment methods of the oblique angle of the oblique end face of pigtail, belong to optical fiber detection technical field, comprising the following steps: step 1) using ANSYS software adopts stereoscopic scanning method scanning and gathers the model data of pigtail and rectangular capillary;Step 2) the oblique angle that the end of pigtail needs to be ground is set in advance, the end of pigtail is simulated to be ground, and the deformation of pigtail grinding is analyzed;Step 3) using vector angle method analyzes the oblique angle of the end of pigtail after grinding, detects the oblique angle that the end of pigtail needs to be ground and the oblique angle of the end of pigtail after grinding;Step 4) the oblique angle of the end of pigtail after grinding is processed;The beneficial effects of the present application: by comparing the oblique angle that the end of pigtail needs to be ground and the oblique angle of the end of pigtail after grinding, the deviation between the oblique angle of the oblique end face of the pigtail after correction or detection grinding and the oblique angle of the oblique end face of the pigtail actually needed is reduced.

The invention discloses an everting 5D seamless process for a rear shoe cover, which relates to the technical field of shoemaking processes, and comprises the following steps: providing a specially-made rear shoe cover blank of which the predetermined everting area is a composite material layer with continuously gradually changed modulus from inside to outside; performing three-dimensional partitioning and differential energy input on the eversion region; a global controllable non-contact forming force field is established around the softened blank; the air pressure vector of each action point in the force field is calculated and dynamically regulated in real time; programmed cooling cooperating with the characteristics of the phase-change material is carried out on the formed body, and a shoe rear cover finished product is obtained. According to the method, the composite material with the modulus changing in a gradient mode is adopted, partition differential heating is combined with non-contact type laminar flow air pressure field driving, high-precision and damage-free three-dimensional forming of the eversion area of the rear shoe cover is achieved, and the excellent size stability and shape retentivity of a product are guaranteed; and an advanced manufacturing solution with high flexibility, digitization and extremely high consistency is provided for the shoemaking industry.

A method for separating a glass ribbon comprises moving the ribbon at a ribbon velocity vector in a conveyance direction. The method further comprises exposing a path on the ribbon to a laser beam to heat the ribbon along the path. The method further comprises moving the laser beam at a spot velocity vector in the conveyance direction that is equal to the ribbon velocity vector. The path continues to be exposed to the laser beam while the ribbon moves at the ribbon velocity vector. The method further comprises melting the ribbon along the path while the path is rapidly heated during the exposing and the moving. In response to the melting, a glass sheet is separated from the ribbon along the path and rounded, separated edges are simultaneously formed adjacent the path on the glass sheet and the ribbon.

The invention discloses a single-fiber vector stress-strain sensor based on a process of coating and plating a solid and liquid double-metal layer on the surface of a spandex fiber, which comprises the spandex fiber as a matrix, a lower electrode layer deposited on the surface of the matrix, an upper electrode layer deposited on the lower electrode layer, and the matrix, the lower electrode layer and the lower electrode layer are packaged through a flexible packaging layer; the lower electrode layer is gold nanoparticles attached to the substrate, the upper electrode layer comprises a metal nickel-plated layer on the lower electrode layer and a liquid metal layer coated on the metal nickel-plated layer, and the flexible packaging layer is made of chitosan. According to the invention, the problem of irreversible conductivity degradation caused by repeated stretching of the existing sensor is solved. The invention further discloses a preparation method of the single-fiber vector stress-strain sensor based on the process of coating the surface of the spandex fiber with the solid and liquid double metal layers.

The invention relates to the technical field of electric heating materials, and discloses an electric heating element with wave-transparent performance and a preparation method thereof.Graphene inorganic fiber fabric is adopted as a conductive heating substrate, so that the electric heating element has excellent electric heating performance, the transmission capacity of the electric heating element to electromagnetic waves is remarkably improved, and the dual requirements of invisibility and deicing are met; in the preparation method, a forward transmission coefficient obtained by a vector network analyzer is introduced, and a surface resistance, an electrode size and a power density calculation model are combined, so that the number of partitions and electrode structure parameters are scientifically determined, and the whole machine is ensured to work stably under the conditions of input voltage and target power; a heating path is accurately designed through an equivalent parallel resistance model, so that the heat uniformity and the response speed are improved; and the cross section area of the electrode is determined by combining international electronic design standards to ensure structural safety and thermal stability.

An additive-containing silica sol in which a scattering intensity (I) of the additive-containing silica sol as a function of scattering vector (q) determined by a small-angle scattering method using X-rays satisfies Formulae (2) and (3):0.1≤(Im⁢axB) / (I0B)-(Im⁢axA) / (I0A)≤4.8Formula⁢ (2)1≤(Im⁢axA) / (I0A)For⁢mula⁢ (3)where IB0 and IA0 are respectively scattering intensities when scattering vector (q) nm−1 of the silica sol is 0.05 if a silica particle concentration in the silica sol before (IB0) and after (IA0) an additive is added is 3.5% by mass, and IBmax and IAmax are respectively scattering intensities when the scattering vector (q) nm−1 of the silica sol is a maximum value if the silica particle concentration in the silica sol before (IBmax) and after (IAmax) the additive is added is 3.5% by mass. A HAZE value of the silica sol after storage at 20° C. for 24 hours is lower than before the additive is added.

An apparatus for fabricating an elasticized material having at least one elastic strand transversely positioned across the apparatus. The apparatus includes a first bonding module and a second bonding module positionable in proximity to the first bonding module. At least one of the first bonding module and the second bonding module has a face with a width dimension and a circumferential axis and is rotatable about a rotation axis in a velocity vector direction, the face having a contour pattern containing a plurality of entrapment elements arranged along a width of the contour pattern, the plurality of entrapment elements having a land and a notch constructed to receive and hold the at least one elastic strand, wherein the contour pattern is arranged at an angle of between −30° and +30° from perpendicular to the at least one elastic strand with respect to the velocity vector direction, during bonding operation, and wherein the land and notch has a longitudinal axis that is at an angle of between −30° and +30° from parallel to the at least one elastic strand with respect to the velocity vector direction.

Pultrusion device (100) for the production of fiber-reinforced profiles (300), comprising a fiber feeder (110) for feeding a fiber material (210), in particular a single thread or fiber bundle (210); an impregnation tool (120) for impregnating the fiber material (210) supplied by the fiber feeder (110), in particular in a pultrusion matrix; a shaping tool (130) for shaping and at least partially curing the impregnated fiber material (210) in order to produce a fiber-reinforced profile (300); a pulling device (140) configured to pull the fiber material (210) alternately or continuously, in particular via the fiber feed (110), through the pultrusion device (100), in particular the impregnation tool (120) and the forming tool (130), and thereby defining a straight main direction of movement, a straight pultrusion direction (P), of the fiber material (210) through the pultrusion device (100); wherein the impregnation tool (120) and / or forming tool (130) has at least two housing parts (121, 122, 131, 132) which form a cavity (120a, 130a) through which the fiber material (210) is drawn and wherein contact surfaces of the housing parts (121, 122, 131, 132) define at least one parting surface (T); characterized by the fact that at least one normal vector (N) of at least one separating surface (T) is not perpendicular to a direction vector of the straight pultrusion direction (P) and where: - that at least one separating surface (T) is a separating plane (T) which has the normal vector (N) that is not perpendicular to the direction vector of the straight pultrusion direction (P) and a magnitude of an angle α between the normal vector (N) and the straight pultrusion direction (P) has an angle value or has a value of < 89° and >1° or - a first extension direction or a first direction vector of the at least one parting surface (T) runs parallel to the normal vector of the pultrusion direction (P) and a second extension direction of the at least one parting surface (T) runs parallel to the pultrusion direction and wherein the at least one parting surface (T) in this second extension direction is at least partially, preferably completely, wavy, zigzag-shaped or inclined plane, at least partially, preferably completely, alternately falling and rising.

The invention relates to the technical field of textile printing and dyeing, and discloses a low-temperature environment-friendly soaping process of a cotton knitted dyed fabric, which comprises the following steps: step 1, performing interface modification treatment on the dyed fabric through ultrasonic wave and negative pressure dipping to form a micro-interface mass transfer channel; step 2, carrying out dynamic temperature-electric field coupling catalytic soaping on the fabric subjected to interface modification by adopting a temperature-sensitive catalytic system; step 3, performing gradient countercurrent rinsing of electric field vector regulation and control on the soaped fabric; and 4, regenerating the rinsing wastewater through membrane-electrolysis coupling treatment, and recycling the regenerated rinsing wastewater in the step 3. Multiple chemical bonding is formed by a surface modifier and a fiber matrix, a three-dimensional ordered pre-adsorption interface layer is constructed, the action efficiency and stability of a functional additive are remarkably improved, and the problem of quality fluctuation caused by non-uniform treatment is fundamentally solved.

This invention discloses a dark-colored velvet-textured ceramic slab, a base glaze, and its preparation method. The dark-colored velvet-textured base glaze is prepared by ball milling according to the following mass ratio of material: water: carboxymethyl cellulose: sodium tripolyphosphate: 100:36:(0.1-0.2):(0.3-0.5). The material of the velvet-textured base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit. The matte transparent frit includes the following components in the following mass percentage: SiO2. The composition is 55-60%, Al₂O₃ 12-15%, K₂O 2-3%, Na₂O 3-4%, CaO 20-25%, and the calcination vector of the matte transparent frit is 1%-5%. This solution improves the light transmittance of the glaze layer, enhances the transparency, and maintains a uniform and dispersed surface gloss without crystallization, resulting in a glaze surface with a velvety soft feel.

The invention provides a control method and system of industrial wrinkle removal equipment, and relates to the technical field of wrinkle removal control, and the method comprises the following steps: reading fiber and wrinkle process characteristics of a fabric to be subjected to wrinkle removal, analyzing a molecular chain bond angle variable of the fabric, and determining a wrinkle removal constraint condition meeting a fiber elastic limit; a wrinkle removal area is positioned through image acquisition, and a wrinkle removal area vector is determined; the method comprises the following steps: establishing a dynamic decision model, making a periodic wrinkle removal decision in combination with a constraint condition and a region vector, determining a multi-path wrinkle removal scheme through multi-target optimization iteration, performing timestamp marking, and finally implementing wrinkle removal control through an intelligent central control system. By means of the method and device, the problems that in the prior art, due to the fact that the wrinkle removing area cannot be accurately positioned, the wrinkle removing scheme cannot be dynamically adjusted, the processing efficiency is low, excessive processing or insufficient processing occurs in the wrinkle removing process, and the quality and durability of the fabric are further affected can be solved, highly-automatic and intelligent wrinkle removing control is achieved, and the fabric quality and durability are improved. And the production efficiency and the fabric processing quality are improved.

Manufacturing an elastic material (134) having elastic strands (12) involves first and second joining modules (210, 220) positioned close to each other, wherein at least one module (210) has a surface (210F) rotatable about an axis, the surface having a repeating profile pattern containing a plurality of ridges (210RL), wherein the plurality of ridges contain a platform (210R) and a notch (210N), the notch (210N) being configured to receive and hold at least one elastic strand (12). The platform (210R) and the notch (210N) have a longitudinal axis at an angle of -30° to +30° with respect to the vector of an individual ridge (210RL).

The invention relates to the technical field of chemical raw material separation, and provides an intelligent parameter control method and system for high-purity isoflavone separation and extraction. The method comprises the following steps: acquiring temperature field data, pressure fluctuation data, solvent concentration gradient and material particle size distribution real-time data in an isoflavone separation and extraction process; establishing a dynamic separation factor of isoflavone aglycone and glycoside forms; adjusting supercritical CO2 extraction pressure and entrainer concentration, and configuring a directional dissociation vector of a phenolic hydroxyl functional group; and introducing a state space, setting a dynamic separation factor as a constraint, determining an optimal control parameter combination in combination with real-time data, and cooperatively controlling the separation and extraction process. According to the method, the technical problems that aglycone and glycoside forms are difficult to efficiently separate and the product purity and yield are low due to lack of parameter cooperative control in the supercritical CO2 extraction process of the isoflavone in the traditional chemical raw material production are solved, and the technical effect of improving the separation efficiency and purity of the isoflavone in the chemical raw material is achieved.

The present application relates to the technical field of high polymer material processing equipment control, and discloses an intelligent control system for PVC shrink film raw material mixing, comprising a data acquisition module, a state solving module, a feedforward control module, a disturbance execution module, a discharge determination module and a main control unit. The collected motor active power and temperature signals are converted into specific mechanical energy and temperature rise rate, a two-dimensional phase plane is constructed, and the tangent slope is calculated to feedforward adjust the servo proportional valve opening degree to match the material rheological state. When the temperature rise rate appears a minimum value, the system actively injects a frequency increment disturbance, and extracts a thermodynamic response characteristic quantity after a set temperature measurement time lag. A two-dimensional response vector is constructed using the characteristic quantity and the input quota threshold. The system determines the real flow state according to the deflection angle of the response vector and outputs a discharge instruction. The present application overcomes the thermal lag error of the temperature sensor, prevents material clumping during the liquid adding process, and improves the accuracy of the discharge end point identification.

A method for preparing composite particles, the method comprising the steps of: (a) providing a plurality of porous particles in a reactor having an outer wall defining an internal volume for containing the plurality of porous particles; (b) agitating the plurality of porous particles using a stirring element located in the internal volume, the stirring element having one or more stirring surfaces, each stirring surface being a region defined by the stirring element at an angle relative to its velocity vector during agitation, and arranged such that movement of the stirring surfaces through the plurality of porous particles causes the plurality of porous particles to be at an angle relative to the velocity vector and / or away from the outer wall along the outer wall, wherein: the outer wall is movable to cause the agitation of the plurality of particles, and the one or more stirring surfaces of the stirring element protrude from an inner surface of the movable outer wall; or the stirring element defines a gap between the stirring element and the inner surface of the outer wall, the gap being less than 10% of the internal dimension of the reactor measured along the direction of the gap; wherein during agitation, the mass of the plurality of porous particles contained in the internal volume depends on the volume of the internal volume and is not more than 500 kg m³. ‑3 And depending on the surface area of ​​the one or more stirring surfaces, it shall not exceed 1000 kg m². ‑2 Furthermore, during stirring, the volume traversed per second by the one or more stirring surfaces depends on the mass of the plurality of porous particles contained in the internal volume, and is between 0.001 and 0.1 m³. 3 s ‑1 kg ‑1 (c) During the stirring of the plurality of porous particles, the plurality of porous particles are brought into contact with a silicon precursor gas under conditions that effectively induce silicon deposition in the pores of the porous particles, thereby providing composite particles comprising a porous particle framework and elemental silicon within the pores of the porous particle framework.

A cylindrical element (1) consists of a fiber-reinforced plastic which exhibits a relationship expressed by formula 2 when a stress-strain relationship equation in an XY plane as in formula 1 is expressed in an orthogonal coordinate system O-XYZ, where an origin O is a center point in the thickness direction of a small element (10) of the cylindrical element (1), the X-axis runs along a tangential direction of a cylinder, the Y-axis runs along the direction parallel to the axial direction of the cylinder, the Z-axis runs along the radial direction of the cylinder, σ is a stress vector, ε is a strain vector, τ is a shear stress, γ is a shear strain, and an element Q ij is an element of the i-th row and j-th column of a plane stiffness matrix Q. { σ x σ y τ xy} ≡ { σ} = [ Q 11 Q 12 Q 16 Q 12 Q 22 Q 26 Q 16 Q 26 Q 66 ] { ε x ε y γ xy} ≡ [ Q ] { ε} Q 12 Q 26 − Q 16 Q 22 ≠ 0

This utility model relates to a combined airflow and scraper cleaning device for vibratory feeders, aiming to solve the problems of difficult cleaning, dead corners, and limited functionality of existing vibratory feeder cleaning devices. The device mainly consists of an air jet unit located at the top of the vibratory feeder and a scraper unit located at the center of the feeder's interior. The air jet unit pre-purges the interior of the vibratory feeder through air nozzles on an annular air pipe to remove loose materials. The scraper unit, driven by a motor, moves the scraper in a circular and upward motion along the spiral feeder guide rail to remove stubborn residue. The air jet nozzles are adjustable-angle vector nozzles, and a venturi tube is installed at the air inlet to improve cleaning efficiency. The scraper rod is telescopic, and its height is adjusted using a gear and rack mechanism. The scraper is made of polytetrafluoroethylene (PTFE) to avoid damaging the guide rail. This device supports the use of airflow and scraper alone or in combination, achieving efficient and thorough cleaning of the vibratory feeder.

The invention discloses a temperature-compensated optical fiber transformer vibration sensor and a measuring method thereof. The temperature-compensated optical fiber transformer vibration sensor comprises a base, an elastic sheet, a rigid rod, a first optical fiber grating and a second optical fiber grating, the elastic sheet is arranged on the base in a suspended mode, the rigid rod is perpendicularly fixed to the center of the elastic sheet and serves as a stress concentration and amplification element, and dispersed stress generated by vibration of the transformer is concentrated to the area where the first fiber bragg grating is located; decoupling of temperature and vibration signals is achieved through the physical position difference of the first fiber bragg grating and the second fiber bragg grating, and temperature compensation is achieved through the double-grating structure layout. According to the invention, a double-grating differential structure is adopted, temperature compensation is realized through the physical layout difference of a strain area and a non-strain area, optical fiber coating processing is not needed, the structure is simplified, the detection precision is improved, and the measurement method realizes multi-dimensional vibration detection and adapts to the actual operation requirements of a transformer through orthogonal arrangement of sensors and vector synthesis.

The invention belongs to the technical field of composite material engineering, and discloses a fiber reinforced composite material performance prediction method and related equipment, and the method comprises the steps: obtaining a space direction vector of each fiber in a to-be-predicted fiber reinforced composite material; calculating a second-order orientation tensor for quantifying orientation distribution of all the fibers based on the space direction vectors of all the fibers; based on the second-order orientation tensor, establishing a representative volume element model of the to-be-predicted fiber reinforced composite material; and performing performance prediction on the fiber reinforced composite material to be predicted according to the representative volume element model. The invention aims to accurately predict the overall mechanical response of the fiber reinforced composite material and shorten the prediction period under the condition of not depending on the preparation and test of a large number of standard and non-standard mechanical parts.

An electrophotographic photoreceptor, a process cartridge, and an image forming apparatus, the electrophotographic photoreceptor including a conductive substrate, a charge generation layer disposed on the conductive substrate, and a charge transport layer disposed on the charge generation layer, the charge transport layer contains a phenolic compound, polyarylate resin, polycarbonate resin and a charge transport material; the vector distance DISHT (J / cm3) 1 / 2 between the HSP value of the charge transport material and the HSP value of the polyarylate resin, which is calculated on the basis of Hansen solubility parameters, and the vector distance DISPC (J / cm3) 1 / 2 between the HSP value of the polycarbonate resin and the HSP value of the polyarylate resin, which is calculated on the basis of Hansen solubility parameters, respectively satisfy the following formulae (1) and (2). Formula (1): DISHT < = 3.9 Formula (2): 9.2 < = DISPC < 12.0

The invention discloses a production process optimization control method of a mineral fiber composite hanging plate. The method comprises the following steps: acquiring working condition data of the mineral fiber composite hanging plate in a typical use scene; constructing a three-dimensional structure model according to the working condition data, and obtaining a three-dimensional stress vector field map; extracting a corresponding fiber stress optimal arrangement direction in the stress vector field graph, and generating a target fiber arrangement vector graph; acquiring real-time distribution image data of the mineral fibers in the slurry; extracting an actual fiber distribution vector diagram in the current slurry state; according to the target fiber arrangement vector diagram and the actual fiber distribution vector diagram in each unit area, calculating an included angle difference value and a direction deviation value in each unit area to form a fiber arrangement error matrix; and generating a corresponding decentralized control parameter adjustment instruction based on the fiber arrangement error matrix. According to the control method, the mechanical strength, bending rigidity and durability of the composite hanging plate can be improved, and the service life of the composite hanging plate is effectively prolonged.

In an orthogonal coordinate system O-XYZ in which the center position in the thickness direction of the minute elements (10) of the cylindrical member (1) is defined as an origin O, the tangential direction of the cylinder is defined as the X axis, the direction parallel to the axial direction of the cylinder is defined as the Y axis, and the radial direction of the cylinder is defined as the Z axis, the stress vector is set as sigma, the strain vector is set as epsilon, and the shear stress is set as tau. The cylindrical member (1) is formed from a fiber-reinforced plastic that satisfies the relationship represented by formula (2), where [gamma] is the shear strain, and Qij is the i-row j-column component of the in-plane rigid matrix (Q), and the stress-strain relational expression in the XY plane is represented by formula (1): [Mathematical formula (1)] [Mathematical formula (2)] [Mathematical formula (1)] [Mathematical formula (2)] [Mathematical formula (2)] [Mathematical formula (2)].

The present invention provides a method for preparing large-format structural parts with locally reinforced short carbon fiber orientation editing, which belongs to the technical field of thermoplastic composite materials. The method studies the changes in the local mechanical properties of the material, performs sensitivity analysis on the structural parts, adopts local vector analysis clustering, and uses a uniformly spaced streamline algorithm to generate a placement path for short carbon fiber thermoplastic reinforced materials. The LFT-D or SMC process is used to prepare a fiber-reinforced structure with spatial orientation, thereby solving the problem of overall structural failure caused by insufficient local load-bearing capacity of the structural parts.

The application discloses a kind of multi-layer fiber composite material cylinder shell linear buckling calculation method, this method includes: to multi-layer fiber composite material cylinder shell structure constructs the displacement expression and transverse stress expression of double helix mode;Solving three-dimensional elastic composite material cylindrical shell equilibrium equation under hydrostatic pressure, obtain the expression of three directions prestress;The three-dimensional deformation differential equation of displacement and transverse stress is constructed as unknown quantity;Based on the displacement expression and transverse stress expression of double helix mode, the state space equation set with displacement and transverse stress as state vector is constructed;The relationship between the state vector of inside and outside surface layer of multi-layer fiber composite material cylinder shell structure is constructed, the buckling mode of multi-layer fiber composite material cylinder shell is solved, and the buckling load under each buckling mode is obtained.The application can accurately estimate the overall buckling load of underwater composite material thick-walled structure.

In addition to the long-period crystalline structure of the PVA molecules, the present invention also provides a water-soluble film that has excellent water solubility and is less likely to cause problems such as damage to packaging materials during storage / transportation by, for example, controlling the degree of phase separation between PVA and other components in the water-soluble film. The water-soluble film of the present invention is a water-soluble film containing a polyvinyl alcohol-based resin, wherein the water-soluble film is subjected to small-angle X-ray scattering (SAXS) measurement in a mixture of water and methanol at a volume ratio of 2:8, and the scattering vector value, i.e., the q value, obtained from the obtained scattering intensity distribution is 0.2 nm. ‑1 The scattering intensity is set to I(0.2), and the scattering vector value, i.e., the q value, is set to 0.5nm. ‑1 When the scattering intensity at the time is set to I(0.5), the intensity ratio of the scattering intensity I(0.5) to the scattering intensity I(0.2), that is, I(0.5) / I(0.2), is 0.05 to 0.5.