105 results about "Stress field" patented technology

This invention discloses a method and system for inverting mechanical parameters and intelligently analyzing the stability of tunnel surrounding rock, relating to the field of intelligent construction technology for tunnels and underground engineering. The method includes: collecting tunnel monitoring and measurement data and constructing a displacement field observation matrix; constructing a physical information neural network embedded with the geotechnical mechanics control equations to invert the mechanical parameters and stress field of the surrounding rock; automatically calling the finite element kernel through a programming interface and calculating the safety factor of the surrounding rock using the strength reduction method; using evidence theory to fuse multi-source analysis results and output the stability level; and driving online model updates and support optimization through prediction-monitoring comparison verification. This invention achieves the integration of parameter inversion, automated numerical simulation, and closed-loop verification, improving the accuracy, efficiency, and intelligence level of surrounding rock stability analysis.

The application discloses a kind of based on the stress field reconstruction and test verification method of blade root of multiple measuring points, comprising the following steps: blade root parameter sampling, modeling and carrying out blade root rim strength analysis;Field reconstruction model is constructed, and the input and output of model are divided, and the reconstruction model training is completed using data;Develop blade root rim tensile test, compare the numerical value measured by test with reconstruction stress value, and verify the reliability of reconstruction model.The application can obtain the stress field of blade root rim position according to input after the establishment of reconstruction model, complete strength analysis, effectively avoid the problems such as long analysis time and large calculation resource consumption in traditional finite element method, with the advantages of fast calculation speed and high precision, and can realize digital twin in industrial scene.The application verifies reconstruction stress field using blade root rim tensile test result, so that reconstruction model result is more convincing.

The application discloses a dangerous rock mass deterioration multifunctional test device and method, and through the setting of a self-weight stress loading frame and a detachable rock deterioration experiment cabin, deep coupling of mechanical load and environmental erosion is realized, technical defects of mutual disconnection of a stress field and an environmental field in traditional tests are solved from the root, the whole process of rock samples from deterioration evolution to final mechanical failure does not need to experience secondary transportation and repeated installation, a crack initiation and evolution mechanism under the guidance of a stress field is effectively restored, and therefore, the accuracy of experimental data in characterization of real damage laws of dangerous rock mass is remarkably improved.

This invention discloses a method, apparatus, equipment, medium, and product for determining the upper limit of fault bearing capacity. The method includes: acquiring seismic data and establishing a stress field around the fractured well based on the seismic data to obtain the fault stress around the fractured well; acquiring core sample data and establishing a fault slip map based on the core sample data; determining the stress at a target point based on the fault stress around the fractured well, and mapping the stress at the target point onto the fault slip map to obtain the upper limit of bearing capacity corresponding to the target point. This technical solution determines the maximum additional fluid pressure required for fault slippage, enabling pre-fracturing fault slipability evaluation and reducing the risk of casing deformation caused by fault slippage during fracturing.

This invention relates to a method for testing the fracture toughness of anisotropic eccentrically loaded single-sided notched tensile specimens, comprising: S1, establishing a two-dimensional plane stress model of anisotropic material ESET specimens; S2, mesh generation; S3, calculating displacement, strain, and stress field to obtain the stress intensity factor K and compliance C under different initial crack lengths and anisotropic material parameters; S4, establishing crack length calculation formulas and stress intensity factor calculation formulas based on compliance under different eccentric loading rates, initial crack lengths, and anisotropic material parameters. This invention allows for rapid and accurate measurement of crack length simply by measuring the deformation of the material under external force; it reliably extends the application range of standardized eccentrically loaded single-sided notched tensile specimens from traditional isotropic metals to modern advanced materials such as composite materials, additive manufacturing alloys, and rolled plates, while ensuring the calculation accuracy under anisotropic conditions.

This invention relates to the field of dynamic load section stress monitoring and feedforward adaptive intelligent correction technology for coal conveyor belts in thermal power plants. The invention provides an automatic monitoring and correction device for coal conveyor belts, comprising: a control host that extracts speckle decorrelation index and maps the transverse segregation gradient matrix through a data acquisition and detection module; a rheological state analysis module that introduces a fractional-order calculus dynamics model to analyze the creep stress field and outputs a deformation potential energy time series; a spatial feature prediction module that uses the Koopman operator to elevate the nonlinear system to a linear functional space, identifies outbreak nodes by tracking eigenvalue drift trajectories, and issues early warning commands; and an acoustic field adhesion breaking correction module that drives piezoelectric ceramic elements to construct a local acoustic radiation standing wave field, breaking van der Waals forces to release transverse shear potential energy. This invention solves the risk of belt misalignment and tearing caused by material segregation and adhesion under multi-coal blending conditions.

The application aims to provide a stress-based 3D printing continuity path planning method. The application obtains a to-be-printed model, discretizes the to-be-printed model into a hexahedral grid, the side length of the grid is twice the printing path width, and the height is the pre-printed layer thickness, and the principal stress field is obtained by using finite element analysis. Since the path is generated on a two-dimensional quadrilateral grid, the principal stress direction field is projected onto the two-dimensional domain. For the stress value of the unit close to zero, the stress direction is arbitrary, a method of uniform principal stress direction field is proposed, the stress line is extracted from the principal stress direction field, a plurality of connection rules are adopted, the isolated points are eliminated, and the continuity is optimized. Finally, each stress line is offset to generate a path with a closed loop, and different paths are connected to generate a globally continuous path. In addition, the extrusion rate is adjusted adaptively according to the path direction to alleviate the overfilling problem caused by grid discretization. The model printed by the method has strong mechanical properties under the premise of guaranteeing the surface quality and the curved surface accuracy.

The present application relates to a kind of X80 pipeline electric arc additive manufacturing method and system based on thermal-mechanical coupling regulation mechanism, the method includes: first, the continuous cooling transformation curve of X80 steel is determined to determine phase transition temperature interval;Thermal-mechanical coupling finite element model containing mobile heat source and mobile force source is constructed and calibrated;On this basis, process prediction model is established, and the mapping relationship between process parameter and temperature field, stress field is obtained;Optimization algorithm is used in simulation space to carry out reverse optimization, and the optimal thermal-mechanical coupling process parameter combination is obtained;Finally, in actual repair process, deposit layer temperature is monitored in real time by infrared temperature measurement, when temperature falls into phase transition temperature interval and approaches optimal impact intervention temperature, drive with welding ultrasonic impact device to execute mechanical impact.The present application can significantly reduce residual tensile stress and improve the degree of grain refinement.

The application discloses a water conservancy tunnel surrounding rock intersection section stability prediction method, device, equipment and medium, the method comprises the following steps: through collecting and analyzing the broadband microseismic response signal of the rock mass under the construction disturbance, the internal structure dynamic change data of the deep rock mass is inverted and output in real time; the response signal of the optical marker in the surrounding rock is captured and analyzed in real time, the three-dimensional dynamic stress field distribution data and the seepage path data of the surrounding rock of the intersection section are reconstructed and output; the digital twin model of the surrounding rock of the tunnel intersection section is constructed; the internal structure dynamic change data of the deep rock mass and the three-dimensional dynamic stress field distribution data and the seepage path data are input to the digital twin model as dynamic boundary conditions in real time, the subsequent motion state of the three twins is deduced by driving the digital twin model; when the motion state of the three twins deduced by the digital twin model shows chaotic characteristics, a surrounding rock instability early warning is sent. The application realizes real-time perception and dynamic evolution early warning of the internal state of the surrounding rock.

This invention provides an optimization method for thermal deformation compensation of alloy plates based on digital twins, relating to the field of data processing technology. The method includes: collecting multi-source heterogeneous data of the alloy plate to be processed; performing finite element simulations on multiple processing conditions to obtain a residual stress field sample set; performing dimensionality reduction processing on the residual stress field sample set to determine a low-dimensional parameterized expression model; constructing a thermo-mechanical coupling deformation model of the alloy plate by combining the low-dimensional parameterized expression model and processing environment temperature data; mapping the residual stress field to the deformation of the alloy plate structure in the processing coordinate system through the thermo-mechanical coupling deformation model of the alloy plate; constructing a rapid prediction model of the machine tool temperature field; calculating the thermal displacement error of the machine tool structure through the rapid prediction model of the machine tool temperature field; fusing the deformation of the alloy plate structure and the thermal displacement error to obtain a comprehensive deformation error; and calculating the control variables in the processing process based on the comprehensive deformation error to obtain the optimal compensation parameters.

This invention relates to the technical field of deep well mining, and particularly to a real-time analysis and early warning method for true triaxial hydraulic fracturing test data. The method includes the following steps: acquiring multi-source monitoring data during the true triaxial hydraulic fracturing test, wherein the multi-source monitoring data includes mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; assigning verification weights matching the test conditions based on the heterogeneous attributes of the mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; and verifying the acquisition timestamps and range matching of each data point using the verification weights to generate a standard dataset. The real-time analysis and early warning method for true triaxial hydraulic fracturing test data provided by this invention can simultaneously capture the stress field, fluid transport, deformation state, and internal fracture evolution characteristics of rock samples, improving the comprehensiveness of rock sample condition characterization and solving the problem of one-sided condition perception.

This invention belongs to the technical field of material physical property analysis, and relates to a method and system for predicting the crack propagation trend of heat sinks using fractal geometry. The method includes the following steps: generating a two-dimensional original matrix of the infrared temperature field; inverting the stress source deformation kernel matrix using a preset empirical Green's space derivative function to generate a six-component moment tensor; generating a principal stress azimuth vector; generating an anisotropic rectangular metric grid; generating a multifractal singular extremum clustering image of the thermal field; generating the steepest fractal gradient vector; and coupling the normalized principal stress azimuth vector and the steepest fractal gradient vector into a preset multi-field parameter feature weighted superposition model to output the current crack propagation amount and crack propagation direction vector. This invention solves the problem that existing nondestructive testing technologies suffer from uncertainty in predicting crack propagation paths and rates due to the failure to effectively integrate microscopic mechanical stress field and macroscopic heat dissipation field information.

The application discloses a kind of full material state multi-field coupling magnetic phase change regulation and control method and application system, it is related to magnetic phase change technical field, it solves the technical problem that existing technology exists excitation source single and material state range narrow, including the following steps: step 1, based on the determination rule of excitation source, at least one of magnetic field, electric field, temperature field, stress field is selected to constitute the excitation source, and the interaction of the excitation source and the electron spin or magnetic moment of substance occurs and changes system free energy;Established the unified regulation and control method covering multiple excitation sources, multiple material states, solved the technical problems that existing technology excitation source is single, material state range is narrow;Provide specific material system and implementation mode, cover solid alloy, liquid magnetorheological fluid, soft matter hydrogel, high-entropy alloy and multiple material states;Application system integrates memory energy storage and trace displacement driving dual function, can be applied to new energy storage, micro-nano precision manufacturing, aerospace, biological medical treatment and other fields.

This invention discloses a method for predicting crack propagation path and remaining life of a notched component with irregular cracks, comprising: designing a notched feature specimen of the notched component with irregular cracks based on the principle of local stress field consistency; establishing a three-dimensional model of the notched feature specimen in ABAQUS and establishing an interface connection between ABAQUS and the three-dimensional crack propagation simulation platform Franc3D to perform dynamic simulation of crack propagation and obtain opening, shear, and tearing stress intensity factors; calculating a composite equivalent stress intensity factor as a measure of crack propagation based on the opening, shear, and tearing stress intensity factors obtained from the simulation, and extracting the composite equivalent stress intensity factor at the leading edge point with the largest increment; estimating fatigue crack propagation life based on the composite equivalent stress intensity factor at the leading edge point with the largest increment; and fitting a crack propagation curve based on the stress-life curve and the fatigue crack propagation life expression. This invention effectively improves the prediction accuracy of crack leading edge trajectory and the accuracy of crack propagation life assessment.

The present application relates to the technical field of three-dimensional graphics data processing, and particularly relates to a three-dimensional ground stress modeling method, system and storage medium. The method comprises the following steps: constructing a three-dimensional space grid model of a geological structure, and marking the spatial parameters of stratum, fault and fissure distribution; inputting the spatial parameters into a preset probabilistic mechanics model to generate a multi-scale fissure field; embedding the multi-scale fissure field into an initial tensor field of a preset three-dimensional stress field to generate continuous stress distribution data containing a crack propagation path through fracture evolution simulation; constructing a numerical updating strategy of fluid-solid coupling based on the continuous stress distribution data to solve the fluid pressure field and the solid stress field in a coupled manner and update the three-dimensional stress field. Through the fusion of multi-scale fissure analysis, fracture evolution tracking and fluid-solid coupling solution, the present application realizes the dynamic reconstruction and three-dimensional visualization of the stress field of the geological structure, and significantly improves the accuracy and expression ability of the ground stress distribution under complex geological conditions.

This invention discloses a method and system for characterizing the stress field transfer direction in coal seams, relating to the field of coal seam safety monitoring technology. The method includes: establishing a quantitative coupling relationship between stress and wave velocity in coal and rock samples through laboratory testing; inverting the three-dimensional wave velocity field of the working face based on microseismic monitoring data, and obtaining the corresponding three-dimensional stress field distribution according to the coupling relationship; calculating the transfer vector of the anomaly area by tracking the temporal changes of the centroid of the stress anomaly area, and obtaining the stress gradient change vector by calculating the temporal changes of the stress field spatial gradient; performing consistency analysis on the transfer vector and the stress gradient change vector, and determining the corresponding direction as the dominant transfer direction of the stress field in the coal seam region when the consistency meets preset conditions. This invention, through dual-path dynamic analysis and cross-validation, can characterize the transfer direction of the coal seam stress field at a regional scale, providing a new technical approach for the monitoring and early warning of coal and rock dynamic disasters.

This application provides a structural optimization method and system for slicing materials specifically designed for 3D-printed eyeglass frames. The method includes: performing finite element stress analysis and extracting continuous stress field data and principal stress directions; calculating dimensionless stress parameters using the continuous stress field data to divide the model's interior into different stress zones and match them with different unit cell types; adjusting the rotation angle and aspect ratio of the unit cells in real time based on the principal stress directions and stress ratios to generate a stress-adaptive internal lattice structure; performing differential geometry analysis on the surface of the 3D eyeglass frame model to construct a comprehensive curvature threshold function and generate a support structure; searching for optimal structural parameters through Pareto front analysis; and integrating the internal lattice structure, support structure, and structural parameters to generate slicing data and plan the printing path. This application optimizes the load-bearing efficiency of the eyeglass frame structure and improves the specific strength of the material.

This invention relates to a method for analyzing the hydrogen explosion process mechanism of recycled NdFeB materials, belonging to the field of simulation technology for rare earth permanent magnet material processing and advanced manufacturing. The method includes: constructing a simplified recycled NdFeB model; establishing a multiphysics numerical model based on the recycled NdFeB model by coupling rare earth diffusion, chemical field, temperature field, stress field, and phase field; solving the multiphysics numerical model to obtain the trends in hydrogen absorption rate and amount, stress and elastic strain energy changes, and phase field evolution data of the NdFeB material during the hydrogen explosion process. This invention can quantitatively simulate, visualize, analyze, and predict the multi-field coupling evolution behavior and final fragmentation effect within the material during the hydrogen explosion process.

This invention provides a method and system for analyzing magnesium alloy sheets based on finite element simulation, relating to the field of manufacturing process technology. The method includes: selecting three sampling regions on the magnesium alloy sheet to define characteristic regions based on macroscopic stress field distribution data, macroscopic strain field distribution data, and rolling force variation data; obtaining adjustment values ​​based on the contour characteristic parameters of the characteristic regions; using the adjustment values ​​to correct the macroscopic stress field distribution data and macroscopic strain field distribution data; identifying the uniformity of stress and strain distribution in the thickness and width directions of the magnesium alloy sheet; and optimizing the rolling temperature, reduction rate, and roll rotation angle in the asynchronous angle rolling process based on the uniformity characteristics to obtain an optimal combination of process parameters. This invention predicts the stress and strain distribution and microstructure evolution during the forming process of magnesium alloy sheets through finite element simulation, reducing costs and improving the quality of sheet products.

This invention discloses an in-situ dynamic detection system and method for three-dimensional stress fields in underground engineering. The detection system includes: a shell; a cavity in the middle of the shell, with an oil supply chamber and multiple mounting slots; the oil supply chamber is connected to an external oil supply device; the mounting slots are divided into an inner section, a middle section, and an outer section from the inside to the outside; multiple drive components, each corresponding to a mounting slot; each drive component includes a movable valve, a spring seat, and a piston; the movable valve is slidably disposed in the inner section of the mounting slot; the spring seat is fixedly disposed in the middle section of the mounting slot; a spring is disposed between the movable valve and the spring seat; the piston is slidably disposed in the outer section of the mounting slot; and multiple pressure sensing units, each corresponding to a drive component, connected to the side of the piston away from the movable valve. The detection system of this invention achieves multi-point dynamic continuous monitoring and active testing, shortening the testing time while ensuring testing accuracy.

The invention discloses an embankment seepage stress coupling stability assessment method and related equipment, and the method comprises the steps: building a stage geometric model based on scouring parameters, and reconstructing the stage geometric model based on embankment-foundation geometric information to obtain an unstructured grid; performing outer boundary identification on the unstructured grid to generate a seepage boundary condition; solving the seepage equation based on seepage boundary conditions to obtain a pore water pressure field; the pore water pressure field is coupled and introduced into the stress field for solving to obtain a stress field solving result; reducing the shear strength parameter by adopting a strength reduction method, judging instability, and determining a safety coefficient; and executing multi-stage flushing automatic iteration, and outputting an evaluation result of the change of the safety coefficient along with the flushing stage. The method can truly and accurately reflect the influence of riverbed scouring and seepage coupling on the embankment stability, rapidly forms a quantitative evaluation result of the evolution of the safety coefficient along with scouring, and can be widely applied to the technical fields of water conservancy projects and geotechnical engineering.

The application discloses a rolling bearing health state evaluation method and system based on digital twinning, acquires multiple-source operation monitoring signals of the bearing, determines working condition boundary conditions, establishes a twinning body driving parameter set containing individual difference characteristics of the bearing, carries out contact dynamics response simulation and elastohydrodynamic lubrication state analysis based on the parameter set, generates stress field distribution characteristics and oil film thickness attenuation distribution, and further forms a bearing internal state atlas through damage accumulation evaluation; on this basis, micro-pitting feature positioning and damage index extraction are carried out, a bearing health state index is formed in combination with working condition correction; individualized degradation baselines and adaptive determination thresholds are established through multi-cycle degradation difference value monitoring, and abnormal damage features are screened; finally, damage features are corrected and residual life grades are marked through double-source cycle comparison monitoring, bearing health monitoring results are output, and early damage identification and individualized life prediction of the bearing are realized.

The present application relates to geothermal development, fossil energy development, rock mechanics and the like, and particularly relates to a fracturing fracture dynamic form prediction method based on multiphase medium space replacement and volume conservation constraint. The method obtains geological, logging, seismic and inversion data within the well section range, establishes a formation model and a rock mechanics parameter field, and based on the volume conservation relationship under the limited space condition, calculates the three-dimensional deformation amount field of the rock under the action of external pressure, so as to predict the spatial form and distribution position of the fracture. The method attributes the formation mechanism of the fracture space to the space released by the pore volume, matrix volume, organic matter volume and fluid volume in the pore under pressure, and combines the porosity, rock strength and stress field distribution to realize the accurate description and prediction of the fracture generation position, direction and form. The method provides theoretical support for fracturing design, cluster spacing optimization and proppant placement scheme, and has high engineering application value.

The application provides a kind of based on adaptive control's heterogeneous tube welding control method and system, it is related to welding control technical field, the method includes: according to welding dynamic deviation signal, in the current weld and adjacent weld in welding heat affected zone, a total of three feature positions are selected, and the local heat field distribution of three feature positions is constituted into heat feature unit;Heat feature unit is divided into heat affected zone, according to the distribution characteristics of the distribution characteristics of base metal metallurgical characteristics and thermal physical parameters corresponding to each sub-region after division, through the pre-trained molten pool flow and heat transfer coupling calculation model, simulate the fluid flow behavior and heat field redistribution process of molten pool under the action of surface tension, electromagnetic force and thermal buoyancy, calculate the coordinated response value of temperature field, flow field and stress field of each sub-region under welding thermal cycle, determine target adjustment amount.The application improves the welding quality stability and process efficiency by adaptively adapting the material and structural differences of heterogeneous tube.

This invention discloses a method and system for simulating ground fissures under pre-existing fracture geological conditions using a coupled FEM-PD model, relating to the field of numerical simulation technology for ground subsidence and ground fissures. The method includes the following steps: constructing a finite element-peripheral dynamics model and initializing its parameters; statically dividing the geological computational domain into a finite element region, a periphery dynamics region, and a coupling transition region; applying pore water pressure changes as an external load to the finite element region; obtaining the global displacement field and stress field by solving the finite element governing equations; applying the global displacement field as a displacement boundary condition unidirectionally to the boundary of the periphery dynamics region; simulating the motion process of material points using an adaptive dynamic relaxation method; and calculating local damage by using the Mohr-Coulomb failure criterion to determine the bond fracture between two material points. This invention innovatively couples the finite element model with the periphery dynamics model, accurately simulating both regional continuity and local discontinuity deformation targets.

The application discloses a crack tip cracking prediction method and system for ductile metal materials, which can accurately characterize the strain energy density distribution of the crack tip of a ductile metal structure, and accurately and quantitatively characterize the crack initiation criterion verification and damage tolerance fatigue life prediction of the crack tip. The method comprises the following steps: obtaining the strain field of the crack tip of the ductile metal material to be measured based on DIC technology; constructing a constitutive model of the ductile metal material to be measured based on a uniaxial tensile test; calculating and obtaining the stress field of the crack tip of the ductile metal material to be measured according to the strain field and the constitutive model based on plastic deformation theory and Newton-Raphson iteration algorithm; calculating the elastic strain energy density field and the plastic strain energy density field of the crack tip of the ductile metal material to be measured according to the obtained stress field and strain field, and obtaining the critical plastic strain energy; and predicting the cracking of the crack tip of the ductile metal material to be measured according to the critical plastic strain energy.

The application discloses a non-harmonic blade dynamic stress field reconstruction method, system, medium and equipment, and relates to the technical field of blade vibration monitoring. The application firstly ensures high fidelity of a numerical model by minimizing the deviation of measured vibration displacement and finite element analysis vibration displacement, so as to obtain a multi-order modal dynamic stress field formed by multi-order modal dynamic stresses on each grid node of a non-harmonic blade model through finite element analysis, and determine a mistuning coefficient of vibration frequency of the non-harmonic blade as a non-harmonic quantity according to a reference frequency under a designed blade motion state, and then depth learning is performed on a complex non-linear mapping relationship of full-field multi-order modal dynamic stresses from a local tip position to the full field; when applied, the multi-order modal dynamic stress field of the target non-harmonic blade can be obtained by coupling the multi-order modal, the distortion problem of the linear method in processing the complex vibration mode of the non-harmonic blade is effectively overcome, and the precise prediction of the multi-modal coupling dynamic stress field of the target non-harmonic blade in actual operation is realized.

The application discloses a forging method for improving the structure uniformity of GH4720Li alloy and belongs to the technical field of high-temperature alloy hot working, which comprises the following steps: firstly, performing multi-cycle axial upsetting and drawing on a cast ingot to preliminarily break the structure; secondly, performing axial upsetting and drawing combined with chamfering to round the blank and promote stress penetration; thirdly, performing multi-fire lengthening to further refine and homogenize the structure; and fourthly, completing the forming of finished rod materials through lengthening and rounding. The application combines different forging forms, homogenizes the internal stress field and recrystallization behavior of the blank, and thus obtains the GH4720Li alloy rod material with uniform structure and stable performance.

This invention relates to a multi-material composite vertically layered bead structure and its design method, belonging to the field of tire structure and manufacturing methods. It comprises multiple layers of composite layers with different elastic moduli stacked together; each composite layer contains at least two materials with different elastic moduli, and the configuration of the elastic moduli of each composite layer results in a non-linear gradient change in the overall lateral elastic modulus distribution of the bead along the lateral direction; at least one composite layer is a non-metallic fiber-reinforced composite layer. The lateral spatial position and material selection of each composite layer are determined by a multi-objective optimization algorithm driven by finite element simulation analysis results of the internal stress field distribution of the bead under extreme working conditions. This invention achieves deep weight reduction while maintaining or even improving the overall load-bearing capacity of the bead, actively eliminating local stress peaks, and significantly improving the fatigue life of the bead, providing a new engineering path for the unsprung mass reduction and durability design of high-performance tires.