9 results about "High shear stress" patented technology

The invention relates to the technical field of shoes, and discloses a foot self-adaptive support adjusting method based on a biomechanical model, which comprises the following steps: S1, foot biomechanical modeling: acquiring foot geometric data of a user through three-dimensional scanning, acquiring dynamic load parameters in combination with gait analysis, and constructing a personalized foot finite element model; s2, stress distribution calculation: sampling according to 0-100% phase intervals of 10% in a gait cycle; s3, material gradient design: determining a gradient material rigidity mapping relation according to Pmax distribution; and S4, realizing a self-adaptive structure: constructing a gradient sole structure through 3D printing. A high-shear-force area is judged through double threshold values, and a pressure gradient self-adaptive non-uniform honeycomb structure and configuration classification are arranged in the area, so that local deformation is dynamically regulated and controlled in a pedaling and stretching period and a landing period, and the effects of reducing a stress peak value of the high-shear area and reducing friction heat accumulation are achieved.

The invention provides a high-shear stirrer, and relates to the field of stirrers, the high-shear stirrer comprises a stirring tank and a fixing frame, a motor is arranged above a shell, a transmission structure is arranged in the shell, a first shaft body and a second shaft body which are concentric are arranged below the shell, turbine blades are arranged on the periphery of the first shaft body, and a shear structure is arranged on the periphery of the second shaft body. The invention further discloses a high-shear stirring method of the stirrer, the first shaft body and the second shaft body form a concentric double-shaft reverse shear stirring structure through the transmission structure, the first shaft body rotating at a low speed is matched with the turbine blades to gather materials, and the second shaft body rotating at a high speed is matched with the shear disc to shear the gathered materials. And a high shear stress field is formed in a shearing disc area by matching with a shearing basket which reversely rotates on the periphery of the shearing disc, so that the shearing effect on the materials is further improved, and turbulent flow or cavitation effect is formed while additional shearing force is generated by matching with the materials jetted and guided back by jet flow holes, so that particles are further refined, and dead angles are reduced.

The invention relates to the technical field of thermal management, in particular to a liquid cooling plate flow resistance characteristic evaluation method and device, a medium and equipment. According to the method, the calculation load is remarkably reduced by converting the flow data into the reduced-order model by utilizing the intrinsic orthogonal decomposition. This can achieve faster analysis without sacrificing accuracy, so that the design can be evaluated and optimized in real time. Moreover, different from the traditional method which may depend on a simplified model or empirical correlation, the method based on the intrinsic orthogonal decomposition can capture a main flow mode, namely a dominant mode, which causes resistance. These modes reveal critical flow characteristics, such as high shear stress, vortex formation and flow separation, which are crucial for understanding the root cause of flow resistance. The capability of quantifying and isolating the important flow structure can deeper understand how the specific flow behavior affects the resistance, so that guidance is provided for the optimization design of the geometrical shape of the liquid cooling plate.

This disclosure relates to the field of vehicle technology, and more particularly to a rear floor frame, a rear floor assembly, and a vehicle. The rear floor frame includes a frame body with rear end interfaces on both sides of its rear end. These rear end interfaces are used to connect to a rear longitudinal beam. A cavity structure is provided on the rear end interface, with an opening facing the rear of the vehicle body. The cavity structure includes a first cavity and a second cavity distributed vertically. The front end of the first cavity extends beyond the front end of the second cavity in a direction away from the opening, forming a clearance portion at the bottom of the first cavity. In the rear floor frame provided by this disclosure, the size of the second cavity is adapted to the installation space at the rear of the vehicle body, and the depth of the first cavity is greater than the depth of the second cavity. By increasing the depth of the first cavity, the contact area when the rear longitudinal beam connects to the rear end interface can be increased, thereby enabling the mating joint to withstand higher shear stress and bending / torsional loads, and improving the space utilization rate in the length direction of the vehicle body.

To provide a magnetorheological fluid composition more excellent in fluidity under high shear when a magnetic field is turned off, as compared with a conventional magnetorheological fluid composition.SOLUTION: The magnetorheological fluid composition includes: magnetic particles; a base oil; a dispersant represented by the following formula (1); and a rheology control agent, the content of the dispersant represented by the formula (1) being 0.30 mass% to 0.55 mass% with respect to the total amount of the magnetorheological fluid composition. In the formula (1), R1 represents an aliphatic hydrocarbon group having 14 to 22 carbon atoms, R2 represents an ethylene group or a propylene group, and n represents an integer of 1 to 12.SELECTED DRAWING: None

The invention relates to a supporting tube wall analysis method and a supporting tube, and a shearing model of a structure center line is generated by establishing communication connection with a database of the center line of a supporting tube composite structure. When the supporting pipe bears shearing force, if the geometrical shape of the supporting pipe changes suddenly, such as a shaft shoulder, a hole and the like, the stress concentration phenomenon can be generated. In a high shear stress concentration area, the actual shear stress borne by the material is far higher than nominal shear stress. The local high shear stress enables a crystal structure in the material to distort and slip, and after a certain number of cycles, fatigue cracks are generated in weak links such as defect positions or grain boundaries of the material. And the pipe wall parameters of the center line of each supporting pipe combination structure are obtained, so that the weight of the supporting pipes under the same load is reduced, and the defects that the weight of the supporting pipes is large, and the strength of the supporting structures is small are overcome.

A lubricating fluid includes a blend of at least two isomers of hydrogenated linear AMS dimers, one of which is a hydrogenated linear AMS dimer having a formula of 2,4-dicyclohexyl-2-methylpentane and another of which is a hydrogenated linear AMS dimer (HLD) isomer having a formula of 1,4-dicyclohexyl-4-methylpentane. The blend reduces viscosities at low temperatures (0° C. and lower), without severely lowering high shear stress EHD shear strength (or traction coefficients), and further inhibits foaming issues which are typical in mixtures of very different fluids such as silicones and hydrocarbons combinations.

The invention discloses a heat-conducting composite material synthesis method based on graded filler deposition and a composite material. The method comprises the following steps: selecting at least two high-thermal-conductivity factor components with different size distribution, and performing interfacial activator or surface layer functionalization treatment on the high-thermal-conductivity factor components; the method comprises the following steps: compounding high-thermal-conductivity factor components with different size distributions with a functional base-loaded liquid polymer according to a ratio, and mixing under a high shear stress condition to obtain each construction unit with required shear viscosity; depositing on a substrate supporting surface layer by layer according to a sequence from larger size distribution to smaller size distribution; applying an external guide and control field in each layered deposition process; adding a bridging wetting structure layer between any two continuous construction units; a micro-cavity structure body of a thermally driven releasable reactive component is mixed and packaged in the bridging wetting structure layer; and a curing process is applied to the deposition body for treatment, and the heat-conducting composite material with the graded heat-conducting channels is obtained.

This invention discloses a gene delivery vector, highly shear stress-sensitive nucleic acid nanoaggregates, their preparation methods, and applications. The highly shear stress-sensitive gene delivery vector includes either polymer PLGA-PGEA or polymer PLGA-PGEA / TA. This invention utilizes ethanolamine and amino-modified tannic acid to functionalize polymer PLGA-PGEA, constructing polymer PLGA-PGEA and PLGA-PGEA / TA gene delivery vectors, exhibiting high cell transfection efficiency, low cytotoxicity, and suitable particle size, showing promise for application in gene therapy for cardiovascular diseases. The PLGA-PGEA / TA gene delivery vector of this invention uses PLGA as a hydrophobic core to stabilize nanoparticles, while the outer PGEA / TA layer improves its water solubility and can also complex genes, obtaining nucleic acid nanoaggregates with the required particle size. These not only safely accumulate in the stenotic region of coronary arteries but also exhibit sensitivity to high shear stress dispersion in the stenotic region, demonstrating significant application value and clinical translational potential in the targeted treatment of atherosclerosis.