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187 results about "Softening" patented technology

Softening is a numerical trick used in N-body techniques to prevent numerical divergences when a particle comes too close to another (and the force goes to infinity). This is obtained by modifying the gravitational potential of each particle as Φ=-1/(√(r²+ε²)), where ε is the softening parameter. The value of the softening parameter should be set small enough to keep simulations realistic.

Acoustic softening of non-newtonian material

A viscosity reduction system includes: a dispenser including: an inlet configured to receive a fluid; an outlet configured to dispense the fluid onto a surface; and a flow channel that fluidly connects the inlet with the outlet; and a vibrating device that directly contacts the dispenser at one or more locations and that is configured to vibrate the dispenser and the fluid when power is applied to the vibrating device.
Owner:GM GLOBAL TECHNOLOGY OPERATIONS LLC

Cold forging step-by-step extruding and stretching method for preparing motor shaft

The invention relates to the technical field of motor shaft machining, in particular to a cold forging step-by-step extruding and stretching method for motor shaft preparation, which comprises the following steps: acquiring forward extrusion approximate average force, and calculating initial deformation resistance of a workpiece based on the forward extrusion approximate average force, obtaining a target parameter increment of a reverse extrusion process and an average inner diameter of a reverse extrusion target hollow part to determine a target volume deformation amount, and determining a process difficulty evaluation index based on the initial deformation resistance and the target volume deformation amount; the adjusting strength of the set value of the punching force is obtained, and the correlation between the process difficulty evaluation index and the follow-up process adjusting strength is determined based on the multiple adjusting strength of the current batch of workpieces and the process difficulty evaluation index; and in response to the correlation adjustment, determining a difficulty threshold of a difficulty state in which the workpiece is machined based on the process difficulty evaluation index. According to the invention, the stamping force and speed of the subsequent process are adaptively adjusted through the initial resistance and annealing softening effect of the material.
Owner:HAIYAN SANWEI COLD-EXTRUSION FORMING CO LTD

Underground structure damage evolution evaluation method under sudden explosion load effect

The invention discloses a method for evaluating damage evolution of an underground structure under the action of a sudden explosion load, and relates to the technical field of civil engineering and engineering disaster prevention, and the method is characterized by comprising the following steps: S1, simulating the underground structure based on an explosion load, a geometric boundary and material parameters, and constructing a unified constitutive model; and S2, introducing a pressure-related strength criterion of a Dwark-Prasugrel criterion into the unified constitutive model so as to describe the influence of confining pressure on the shear strength. The technical problem to be solved by the invention is to provide the method for evaluating the damage evolution of the underground structure under the action of the burst explosion load, so that the key pain points such as pressure correlation, high strain rate effect, material random discreteness, damage softening energy consistency and the like are difficult to consider at the same time in the existing analysis method. A set of damage evolution evaluation method and implementation system which can be implemented from the material level to the structure level is established, and quantitative prediction and engineering grading judgment of the whole process of crack initiation, expansion to instability failure of the underground structure are supported.
Owner:CHINA UNIV OF MINING & TECH

Processing detection system and detection device for hydraulic shaft sleeve

The invention relates to the field of precision machining detection, and discloses a hydraulic shaft sleeve machining detection system and detection device which comprises a pneumatic servo control module, a signal collecting and processing module and a thermal inversion calculation module. The pneumatic servo control module drives the overturning air cylinder to apply a composite pressure waveform containing a static reference and a periodic flutter component to the hydraulic sleeve; the signal acquisition and processing module performs frequency domain analysis on a displacement signal detected by the displacement sensor and separates average displacement and displacement amplitude; the thermal inversion calculation module calculates real-time dynamic stiffness according to the displacement amplitude, a material stiffness thermal softening model is used for reversely deducing a temperature rise value, thermal expansion and elastic deformation errors are stripped through multi-dimensional error decoupling operation, and real height data under the standard temperature and without external force are calculated. According to the invention, active excitation and frequency domain analysis technologies are utilized, so that the interference of an oil film and thermal deformation is effectively solved, and high-precision online detection and processing compensation of a thermal-state workpiece are realized.
Owner:ZHEJIANG HIGWAY HYDRAULIC TECH CO LTD

Machining method of HUD free-form surface mirror

The invention relates to the technical field of optical element machining, in particular to an HUD free-form surface mirror machining method which comprises the following steps of S1, substrate selection and cutting, S2, edge treatment, S3, first-stage hot bending forming, S4, second-stage hot bending forming and S5, grinding. According to the machining method disclosed by the invention, through cooperative use of the first-stage hot bending forming and the second-stage hot bending forming, machining operation of the free-form surface mirror with the large size, the large curvature and the small thickness can be achieved; meanwhile, through the two-stage hot bending forming process, primary forming is conducted through first-stage hot bending forming, pressure maintaining is conducted near a softening point through second-stage hot bending forming, the glass is evenly heated and stressed, residual stress is effectively released, the surface type is promoted to present an ideal gradual change trend, edge distortion is greatly reduced, and the high-precision surface type of the final curved mirror is ensured.
Owner:WUHU TOKEN SCI

High-temperature corrosion protection coating for heating surface of boiler and preparation method of high-temperature corrosion protection coating

The invention belongs to the technical field of thermal power heating surface treatment, and provides a boiler heating surface high-temperature corrosion protective coating and a preparation method thereof in order to solve the technical problems that in the prior art, a nano ceramic coating and a metal alloy coating for treating thermal power boiler heating surface high-temperature corrosion are insufficient in adhesive force, prone to falling off and short in protection service life. Through multi-layer structure design and technological parameter optimization, a coating system has continuous thermal expansion coefficient gradient distribution in the interval of 500-900 DEG C, the metal bonding layer at the bottom layer has a pore structure which can effectively absorb thermal stress, the nano ceramic layer at the surface layer can maintain high-temperature stability, and it is verified that the overall bonding strength is larger than or equal to 35 MPa, and the thermal expansion coefficient is larger than or equal to 10%. Compared with a traditional single-layer coating, the adhesive force is improved by 200% or above, and therefore the technical problems that in the prior art, adhesive force is insufficient, thermal stress is not matched, and high-temperature softening fails can be effectively solved.
Owner:XIAN THERMAL POWER RES INST CO LTD +1

A titanium alloy sheet local heat / electricity / ultrasound multi-field coupling assisted incremental forming device and a method for using the same

A kind of titanium alloy plate local heat / electricity / ultrasonic multi-field coupling assisted progressive forming device and its use method, relate to a kind of titanium alloy plate progressive forming device and its use method.The present application is to solve the technical problems of the existing titanium alloy plate progressive forming method relatively slow heating speed, high energy consumption, poor product quality.The device of the present application realizes two-stage heating by local non-contact heating and pulse current self-resistance heating, improves the heating rate, improves the material plasticity by the "electroplasticity" effect generated by pulse current, reduces the material deformation resistance by the "ultrasonic softening" effect generated by ultrasonic field, improves the formability, and improves the forming quality by multi-field coupling.The present application realizes the reduction of material deformation resistance and plasticity by the coupling of heat, electricity and ultrasonic multi-energy field in the deformation process of sheet metal, and significantly improves the formability of material.
Owner:HARBIN INST OF TECH

Polyacrylamide low-temperature pulverizing device

The utility model discloses a kind of polyacrylamide low-temperature crushing equipment, it is related to the field of crushing equipment, including installation fixed plate, driving motor, blade shaft and crushing blade, the driving motor is fixedly installed in the rear end of installation fixed plate, the blade shaft is movably installed in the front end of installation fixed plate, multiple the crushing blade is fixedly installed in the outside of blade shaft.The utility model can forcibly make external air blow into the inside of crushing cover through air guide duct, the airflow not only significantly reduces the friction heat in the crushing process, avoids polyacrylamide because of high temperature softening or caking, but also can be dispersed by airflow disturbance Material is fully dispersed, improve crushing uniformity, fan shaft and blade shaft are directly linked, without additional power source, just through driving motor can synchronous drive crushing and air supply function, greatly reduce energy consumption, simplify equipment structure, while continuous airflow can prevent the fine powder after crushing in rotating discharge pipe accumulation, ensure that discharge is unobstructed.
Owner:RIZHAO DAZHU CHEMICAL CO LTD

Method, system and equipment for optimizing temperature of hot bending station mold and storage medium

The invention discloses a method, system and equipment for optimizing the temperature of a hot bending station mold and a storage medium, belongs to the technical field of glass hot bending forming, and solves the technical problem that the temperature optimization efficiency of the station mold is low. The method comprises the following steps: step 1, constructing a calculation model for calculating the mold temperature of each work station; step 2, inputting the comprehensive coefficient K of each work station mold and the work station beat CT into a calculation model; step 3, inputting the temperature set value of each work station mold into the calculation model to obtain the predicted temperature reached by each work station mold; 4, judging whether the predicted temperature of the last station of the preheating work station reaches the softening point temperature of the glass or not; 5, if not, adjusting the temperature set value of the previous preheating work station, and executing the step 3; otherwise, executing the step 6; and step 6, outputting the optimized temperature set value of each work station mold. The temperature of the work station mold can be automatically calculated and evaluated only by setting the temperature and the CT of each work station, the efficiency of parameter optimization is greatly improved, and the method is visual, rapid and accurate.
Owner:BIEL OPTIC HUIZHOU +2

A large composite u-shaped stiffened panel co-curing forming process

This invention discloses a co-curing molding process for large composite material U-shaped stiffened wall panels, including skin panel laying, stringer laying, first tweezer filling, stringer flipping and positioning, intercalation laying, second tweezer filling, stringer cavity laying, curing soft mold laying, soft mold limiting, pressure curing, and demolding. The stringer laying uses a complete composite soft mold as the male mold, achieving dual-purpose use of one mold. During curing, a combination of a complete composite soft mold and split soft molds is used. The complete composite soft mold serves as the main mold, with a thicker thickness and greater vertical edge rigidity. The cooperation between the complete composite soft mold and the soft mold limiting prevents softening and sinking of the vertical edges, thus solving the problem of straightness in the vertical edge length direction. The split soft molds serve as pressure equalizing plate molds. The pressure applied during curing in an autoclave transfers vacuum bag pressure to the split soft molds, and the moving extrusion provides pressure to the vertical edges and radius corners, causing the tweezers and intercalations to return to their theoretical positions under the curing extrusion action, ensuring no damage or problems.
Owner:CORTEX (CHINA) COMPOSITE MATERIALS CO LTD

Pencil plate wax dipping softening device for pencil production and production process thereof

The application discloses a pencil plate wax immersion softening device for pencil production and a production process thereof and belongs to the technical field of pencil manufacturing, which comprises a base, the upper ends of the base are fixedly connected with limiting rings on both sides, the interiors of the two limiting rings are rotationally connected with a roller in common, the left side of the roller is provided with a driving assembly, the right side of the roller is rotationally connected with a cover plate, the interior of the roller is fixedly connected with an air pressure changing assembly, and the air pressure changing assembly can change the air pressure in the roller. When the piston plate moves leftwards, the air pressure on the right side in the roller is reduced, which is helpful to sucking out the bubbles mixed in the pencil plate; when the piston plate moves rightwards, the air pressure on the right side in the roller is increased, which can exert pressure on the wax oil and forcibly push the wax oil to penetrate into the pencil plate. The periodic change of the air pressure effectively solves the problems of bubble residue and insufficient penetration in the traditional wax immersion process, and significantly improves the wax immersion softening effect and uniformity of the pencil plate.
Owner:LUAN LONGHUI STATIONERY CO LTD

Plasma etching based metal matrix composite machining apparatus and method

This invention proposes a metal matrix composite material processing apparatus and method based on plasma etching, belonging to the field of composite material processing. It determines the material properties, target processing method, and final service performance requirements of the metal matrix composite workpiece. The workpiece consists of a metal matrix and reinforcing particles dispersed within the metal matrix. The area to be processed on the workpiece is exposed to a plasma jet, and plasma etching is used. The reinforcing particles react and transform into volatile gases, which are then removed from the metal matrix, forming a softening pretreatment layer on the workpiece surface. Ultrasonic vibration cutting is then used to remove the softening pretreatment layer. This invention removes the reinforcing particles from the metal matrix through plasma etching, locally transforming the originally heterogeneous and difficult-to-process composite material into a relatively homogeneous metal layer for cutting. This achieves homogeneous transformation of the processed object, eliminating the core mechanisms of particle pull-out, breakage, and interface cracking in traditional processing.
Owner:WUHAN UNIV OF SCI & TECH

A high-strength anti-softening copper-tantalum composite material with a bimodal grain structure and a preparation method thereof

The application discloses a high-strength softening-resistant copper-tantalum composite material with a bimodal grain structure and a preparation method thereof, and the method comprises the following steps: firstly, according to the design composition of the target product copper-tantalum composite material, different sizes of copper powder and tantalum powder are mixed and high-energy ball-milled to obtain a multi-element structure copper / tantalum composite powder; secondly, the multi-element structure copper / tantalum composite powder is pre-densified and sintered to obtain a composite blank; and thirdly, the composite blank is rolled or / and extruded to obtain the copper-tantalum composite material. Based on the composite configuration design of the bimodal grain structure, the coarse-fine grain regions are used to form a non-local strain gradient induced back stress strengthening effect, local stress concentration and strain mismatch are relieved, the strength and plasticity of the copper-tantalum composite material are simultaneously improved, and the alloying method is used to introduce a double-scale nano tantalum phase, so that the high-temperature softening resistance of the composite material is improved, and the composite material is suitable for the fields of electronic packaging, heat sinks and electric contact materials.
Owner:NORTHWEST NONFERROUS METALS BAOJI INNOVATION INSTITUTE +1

Automobile composite material brake pedal arm and forming method thereof

According to the automobile composite material brake pedal arm and the forming method thereof, after a composite material cutting piece which is heated to be softened is hung on a hanging needle of a fixed mold, the mold is closed, a movable mold insert pushes the composite material cutting piece into a concave cavity of the fixed mold in an extruding mode to form a U-shaped framework, and then the pedal arm is formed through injection molding; wherein the hanging needles extend out of the concave mold cavity and are higher than the upper surface of the mold cavity, the movable mold is provided with a plurality of independent inserts protruding towards the fixed mold, a positioning structure is arranged at the top end of part of the inserts located at the plane section of the U-shaped framework, and an auxiliary structure matched with the positioning structure is arranged at the corresponding position in the concave mold cavity of the fixed mold; positioning steps protruding out of the surfaces of the peripheral inserts are arranged on the tops and / or the side walls of part of the inserts located at the curved surface section of the U-shaped framework. According to the method, the problem that accurate positioning is difficult when a composite material sheet is formed into a complex-section workpiece is solved, and the requirement for accurate positioning of the composite material sheet is met while the fusion strength of an injection molding part and the composite material sheet is met.
Owner:HUNAN UNIV +1

Carbon fiber composite material mesoscopic modeling simulation method based on humid and hot circulation condition

The invention discloses a mesoscopic modeling simulation method for a carbon fiber composite material based on a humid and hot circulation condition. The method comprises the following steps: constructing a cubic unit cell model containing 3 * 3 uniformly distributed fibers, and setting a Cohesive unit on a fiber / matrix interface; heat-humidity related material parameters are given to fibers, a matrix and an interface, and a model of degradation of matrix performance along with circulation is established; a matrix maximum principal stress criterion and an interface mixed mode damage criterion are adopted, and energy linear softening is matched to describe damage evolution; periodic boundary conditions are applied through a Python script, and the periodicity of unit cell response is guaranteed. Humidity is loaded on the surface of a unit cell in an equivalent temperature mode and is introduced into static analysis after heat conduction simulation diffusion, and wet expansion is driven and displacement loads are superposed. The method can output a stress nephogram, damage distribution, crack propagation and a performance curve, and realizes the microscopic damage prediction of the composite material in the humid and hot environment.
Owner:SOUTHWEST TECHNICAL ENGINEERING RESEARCH INSTITUTE OF CHINA SOUTH IND GROUP +1

Preparation method of high-temperature-resistant memory metal for temperature control device

The invention relates to the technical field of metal materials, in particular to a preparation method of high-temperature-resistant memory metal for a temperature control device, which specifically comprises the following steps: S1, raw material smelting, S2, ingot casting pretreatment, S3, molding processing, S4, heat treatment and S5, surface treatment. According to the preparation method, the prepared nanorod composite material is added into the raw materials of the memory metal, the nanorod composite material can be used for pinning a grain boundary like a'framework ', preventing grain growth or grain boundary softening at a high temperature and enhancing the stability of a crystal structure, and the nanorod composite material is not easily scattered at the high temperature, so that the reversibility of phase change can be kept, and the mechanical property can be maintained; and the nanorod composite materials can be mutually connected through the fiber net-shaped structure coated on the surface, so that a continuous-phase nanorod layer is formed, the effect of isolating oxygen can be achieved, internal metal is prevented from being further oxidized and corroded, performance stability can still be maintained in a high-temperature environment, and the high-temperature resistance of the memory metal can be effectively improved.
Owner:AUONE ELECTRONICS MFG

Composite material for electrode insulation support frame and preparation method thereof

PendingCN121758865Ahigh tensile strengthVicat softening point is highAntioxidantPolypropylene
The invention discloses a preparation method of a composite material for an electrode insulation support frame. The preparation method comprises the following steps: (1) preparing matrix particles; (2) preparing primary modified particles; (3) carrying out surface alkylation modification to prepare filler particles; and (4) carrying out melt blending and extrusion granulation on the filler particles, polypropylene powder and an antioxidant to obtain granules, carrying out hot press molding on the granules, and cooling to normal temperature to obtain the composite material for the electrode insulation support frame. The composite material prepared by the method has higher tensile strength and vicat softening point, which shows that the composite material prepared by the method has good mechanical property and heat resistance, and can obviously improve the durability of the support frame and reduce the maintenance and replacement cost when being applied to the electrode insulation support frame.
Owner:WUNING COUNTRY JUHONG CHEM IND EQUIP CO LTD

Fitting method of johnson-cook constitutive model for drawing of ptw7ir1 alloy ultrafine wire

PendingCN122287197ASolve the problem of behavioral description distortionAccurate prediction of true hardening behaviorMetallic materialsAlloy
This invention discloses a fitting method for the Johnson-Cook constitutive model of PtW7Ir1 alloy ultrafine wire drawing, belonging to the field of numerical simulation technology for metal material processing. This invention extracts three coefficients from the JC constitutive model and obtains the true stress-strain by conducting room temperature quasi-static uniaxial tensile tests on standard PtW7Ir1 alloy specimens. Then, it solves for the yield strength A and elastic modulus of the PtW7Ir1 alloy. Using the Hollomon's rule and the JIA rule, it obtains the strain hardening modulus B and hardening exponent n. Based on the yield stress data obtained from the tensile test, it calculates the strain rate strengthening coefficient and thermal softening exponent using the least squares method to complete the fitting of the constitutive model. This invention obtains JC constitutive parameters applicable to this alloy and, by introducing the Hollomon's rule and the JIA rule, accurately predicts the true hardening behavior of the material after necking, enabling the constitutive model to more realistically reflect the mechanical response of the material under cumulative deformation in multiple drawing passes.
Owner:KUNMING UNIV OF SCI & TECH

Friction stir additive forming process for alloy heterogeneous laminated component

The invention discloses a stirring friction additive forming process of an alloy heterogeneous laminated component, and belongs to the technical field of metal solid phase additive manufacturing. A substrate material and an additive raw material are selected; the hollow stirring head is moved to a preset position above the substrate material, and the thickness of an additive layer is set to be h; the additive raw material penetrates through the hollow stirring head to be fixed, the additive raw material synchronously rotates along with the hollow stirring head and is fed towards the substrate material under driving of axial force, and the end of the additive raw material makes contact with the surface of the substrate material and generates friction heat; after the end of the additive raw material is heated and subjected to thermoplastic softening, the feeding speed is increased, and a cavity between the bottom of the hollow stirring head and the base is fully filled with the softened material; and after filling saturation, moving along a set path according to a set moving speed for continuous deposition to form an additive alloy deposition layer attached to the substrate material. According to the method, defect-free heterogeneous metallurgical bonding is achieved, the gradient structure of hard layer bearing and soft layer energy absorption is finally formed, high strength and high ductility are achieved, and the method is suitable for manufacturing of high-performance light-weight components in the fields of aerospace and the like.
Owner:NANJING UNIV OF SCI & TECH

Insertion system and method for inserting a medical device - Patent Application 20070122997

An insertion tool for inserting at least a portion of a medical device into a subject, an insertion device including the insertion tool and an insertion mechanism, and a method for manufacturing the insertion tool, wherein the insertion tool includes an entry portion including a composite material, the composite material including at least one first material and at least one second material, the first material being an amorphous material or an amorphous composite, and the second material being a fibrillar material or a fibrillar composite or a crystalline material or a crystalline composite, wherein the fluid absorbency of the first material of the composite material is higher than the fluid absorbency of the second material of the composite material, and the insertion device is adapted to soften upon contact with bodily fluids due to the fluid absorbency of at least the amorphous material or the amorphous composite.
Owner:F HOFFMANN LA ROCHE & CO AG

Modularized layered multi-medium softening and filtering treatment unit

The modular layered multi-medium softening and filtering treatment unit comprises a first filtering box, a softening treatment box and a second filtering box which are sequentially communicated, a water inlet pipe is assembled on the top of the first filtering box, a filtering assembly is arranged in the first filtering box, and a stirring assembly and a reciprocating spraying assembly are arranged in the softening treatment box; a water outlet pipe is arranged at the bottom of the second filtering box, a filtering piece is arranged in the second filtering box, the first filtering box and the softening treatment box are detachably connected through a connecting pipe, and the softening treatment box and the second filtering box are detachably connected through a connecting pipe. The invention discloses a modular layered multi-medium softening and filtering treatment unit, which realizes water quality pretreatment, uniform softening reaction and deep filtration through a first filtering box, a softening treatment box with a stirring and reciprocating spraying assembly and a second filtering box which are sequentially communicated and detachably connected, and improves the softening effect and the equipment maintenance convenience.
Owner:ZHEJIANG XINWEI ENVIRONMENTAL PROTECTION EQUIP CO LTD

Desulfurization slurry softening device and method

The invention relates to the technical field of wet desulfurization, in particular to a desulfurization slurry softening device and method.The desulfurization slurry softening device comprises a sampling and primary sedimentation module, a hardness removal reaction precipitation module, a precision filtration and temperature control module and a safety control and pollution discharge module which are sequentially communicated. Through the integrated design, real-time anti-blocking sampling, efficient chemical hardness removal, precise constant-temperature filtration and safe automatic control of high-solid-content and high-hardness desulfurization slurry are achieved, the problems of sampling pipeline blockage, membrane rear pipeline crystallization, measurement electrode damage and the like in the traditional technology are effectively solved, and the device is compact in structure, stable and reliable in operation and high in practicability. The method is suitable for desulfurization system bypass continuous softening treatment.
Owner:HUBEI XISAISHAN POWER GENERATION CO LTD +1

Method for testing fracture track of metal material under multi-field coupling effect

The invention relates to a method for testing a fracture track of a metal material under a multi-field coupling effect. The method comprises the steps of sample preparation, high-temperature speckle preparation, sample loading, strain field acquisition, fracture morphology observation, data processing and fracture model establishment. By constructing a new fracture test method under the action of multi-field coupling, the problems of lack of physical field coupling factors, non-uniform test systems, limitation of fracture models and the like at present are effectively solved. A coupling loading test system capable of synchronously applying complex stress, high strain rate and transient high temperature is established, and real simulation of the multi-physical field coupling effect under the actual disaster working condition is achieved; a metal material fracture test system with universality and comparability is formed; key data support is provided for building a fracture model comprehensively considering the stress three-dimensional degree, the strain rate effect and temperature softening, the accuracy and reliability of fracture track prediction of the steel structure under the extreme disaster are remarkably improved, and an important basis is provided for engineering disaster resistance design and safety evaluation.
Owner:JINAN UNIVERSITY

A processing and detecting system and detecting device for hydraulic bushing

The present application relates to the field of precision machining detection, and discloses a hydraulic shaft sleeve machining detection system and detection device, which comprises a pneumatic servo control module, a signal acquisition and processing module and a thermal inversion calculation module.The pneumatic servo control module drives the overturning cylinder to apply a composite pressure waveform comprising a static reference and a periodic jitter component to the hydraulic sleeve; the signal acquisition and processing module performs frequency domain analysis on the displacement signal detected by the displacement sensor to separate the average displacement and displacement amplitude; the thermal inversion calculation module calculates the real-time dynamic stiffness according to the displacement amplitude, inversely calculates the temperature rise value using a material stiffness thermal softening model, and separates the thermal expansion and elastic deformation error through multi-dimensional error decoupling operation to calculate the standard temperature and real height data under no external force.The present application effectively solves the oil film and thermal deformation interference by using active excitation and frequency domain analysis technology, and realizes high-precision online detection and machining compensation of the thermal workpiece.
Owner:ZHEJIANG HIGWAY HYDRAULIC TECH CO LTD

Mesophase pitch and production method and production system therefor

The present invention relates to the technical field of carbon materials. Disclosed are a mesophase pitch, and a production method and production system therefor. The method comprises: (1) performing a first thermal reaction on a hydrocarbon-containing raw material to obtain a first gas-phase stream and a first liquid-phase stream; and (2) carrying out a second thermal reaction on the first liquid-phase stream to obtain a second gas-phase stream and a second liquid-phase stream, wherein the content of anisotropic components in the first liquid-phase stream is not greater than 10%, and the average particle size of mesophase spheres in the anisotropic components is not greater than 20 μm. The method is simple to operate, and the obtained mesophase pitch has the characteristics of a moderate softening point, good spinnability, etc.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1

An inversion analysis method of tensile softening constitutive model of quasi-brittle materials under monotonic loading

ActiveCN121720855BDistinguish mechanical behaviorAvoid the difficulty of taking into account the mechanical properties of different stagesMaterial strength using tensile/compressive forcesMaterial strength using steady bending forcesCrazingNumerical models
The application relates to the technical field of quasi-brittle material mechanical property testing and constitutive inversion, in particular to an inversion analysis method of a quasi-brittle material tensile softening constitutive under monotonic loading, which comprises the following steps: collecting unilateral notched beam specimen size parameters and monotonic loading three-point bending test data; establishing a two-dimensional numerical model comprising an undamaged area and a cohesive crack area; constructing a segmented linear tensile softening constitutive subroutine comprising an elastic stage and a softening stage; integrating the two-dimensional numerical model and the subroutine, iteratively inverting constitutive parameters through an optimization algorithm, and outputting a final segmented linear tensile softening constitutive after the simulation data and the test data reach a preset fitting degree. The method can improve the constitutive inversion accuracy, adapt to the nonlinear fracture characteristics of quasi-brittle materials, and provide reliable support for material performance evaluation.
Owner:GUIZHOU UNIVERSITY OF FINANCE AND ECONOMICS

High-strength high-conductivity copper-tin alloy wire resistant to high-temperature softening and a preparation process thereof

The application discloses a high-strength and high-conductivity copper-tin alloy wire capable of resisting high-temperature softening and a preparation process thereof, and the copper-tin alloy wire comprises the following raw materials in percentage by mass: Sn 0.25-0.35 wt.%; Zr 0.15-0.35 wt.%, and the balance of Cu and inevitable impurities. The Cu-Sn-Zr alloy wire has a tensile strength of more than 700 MPa, an electrical conductivity of more than 75% IACS, and a softening resistance temperature of more than 400 DEG C, and can meet the use requirements of the high-strength and high-conductivity Cu-Sn alloy wire at high temperature. After deformation heat treatment of the alloy rod is completed, the alloy rod is subjected to gradual cooling treatment through a special gradual cooling device, so that problems such as thermal cracks in the cooling process are avoided, and the quality of the alloy rod product is ensured.
Owner:INSTITUTE OF MATERIALS & INTELLIGENT MANUFACTURING JIANGXI ACADEMY OF SCIENCES +1

Global characterization method of elastic-plastic parameters of variable stiffness and strength metal by high temperature thermal softening

ActiveCN116992654BVariable stiffnessVirtual field
The present application relates to the field of material mechanical property characterization, in particular to a high-temperature thermal softening variable stiffness and strength metal elastic-plastic parameter global characterization method, comprising: obtaining strain field data and temperature field data of the test piece, and tensile load data; constructing a thermal-mechanical coupling elastic-plastic constitutive model of the metal plate, and establishing a target function of temperature-related parameters to be solved under the constraint of multiple virtual fields based on the virtual work principle; accurately identifying high-temperature thermal softening elastic parameters by using elastic stage data, and then identifying anisotropic strength thermal softening plastic parameters by using composite field data of the whole loading process under variable stiffness; the present application breaks through the condition restriction of constant stiffness when characterizing thermal-mechanical coupling properties of metal materials by using existing test methods, and can realize global accurate characterization of high-temperature thermal softening and anisotropic complex elastic-plastic thermal-mechanical coupling property parameters by only one test, thereby minimizing the number of tests and simplifying the test process.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

A method for determining the percolation threshold of a particle composite material comprising hard particles, soft inclusions and particles of interphase

ActiveCN115374683BDesign optimisation/simulationVolume averageTheoretical Technique
This invention discloses a method for determining the percolation threshold of particle-type composite materials applicable to hard particles, softened inclusions, and those containing mesophases. The method includes: determining the percolation threshold of hard particle systems based on mesophase thickness reduction; determining the percolation threshold of particle systems containing thick mesophases based on Maxwell homogenization, volume-averaged depolarization factor, and scattering tensor; constructing an interpolation function based on the correlation ratio, considering the correlation effects of short-range repulsive fields and long-range scattering fields; and determining the percolation threshold of non-spherical particle systems with mesophases of arbitrary thickness based on the relative thickness parameter of the mesophase and the constructed interpolation function. This invention overcomes the limitations of existing theoretical techniques, which cannot cover a wide range of non-spherical particle systems and cannot quantify the percolation characteristics of materials under the influence of mesophase evolution. It also overcomes the technical bottlenecks of low efficiency and difficulty in guaranteeing accuracy in numerical simulation, enabling the effective determination of percolation phase transitions in drastically different particle-type composite materials.
Owner:HOHAI UNIV