17 results about "Stress equilibrium" patented technology

The invention relates to the field of urban rail transit engineering and structural dynamics, and provides an interlayer and strain rate coupled subway tunnel lining dynamic mechanical property evaluation method and system, and the method comprises the following steps: 1, preparing an interlayer-containing cement-based cylindrical sample; step 2, applying strain rate loading, and collecting original data; step 3, reconstructing stress-strain response, and performing criterion of stress balance and constant strain rate; 4, acquiring the energy absorption rate, the dynamic compressive strength and the yield inflection point strain, and recording the failure form type; 5, establishing a statistical damage model and inverting model parameters; step 6, extracting an initial damage coefficient and a damage rate, and establishing an empirical regression formula; and step 7, constructing an evaluation index set, performing grading evaluation, and outputting material optimization and process suggestions. According to the scheme, the design, checking calculation and rapid evaluation capabilities of the subway tunnel lining under high strain rate working conditions such as impact or explosion are remarkably improved.

The invention relates to the technical field of gear machining, and discloses an internal gearing powerful gear honing tooth surface residual stress field calculation method based on force-heat coupling. The method comprises the following steps: establishing a honing motion coordinate system to calculate three-dimensional coordinates and relative speed of a contact point, and constructing a three-dimensional to two-dimensional coordinate mapping mechanism; constructing a tooth surface temperature field model based on the relative speed, the correction of heat taken away by cuttings and the point heat source superposition principle; respectively solving mechanical and thermal load stress fields based on the two-dimensional coordinates and the temperature field, and superposing to obtain total elastic stress; and an elastic-plastic constitutive relation and a yield criterion are introduced, stress relaxation calculation is performed through a step-by-step unloading method and a plastic release stress balance equation, and the final residual stress is obtained. The method solves the problems of lack of force-heat coupling mechanism analysis and insufficient stress evolution calculation precision in the prior art, and realizes accurate prediction of the internal meshing gear honing residual stress.

This disclosure relates to a method, apparatus, electronic device, and storage medium for determining buckling phenomena in a tubing string, belonging to the field of piping. The method includes: determining the stress and moment of a micro-element of the tubing string to be tested, wherein the stress of the micro-element is the resultant force of gravity, support reaction force, friction force, and pressure acting on the micro-element, and the moment of the micro-element is the bending moment and torque of the micro-element; determining the equilibrium differential equation of the micro-element based on the stress and moment of the micro-element, wherein the equilibrium differential equation of the micro-element includes the stress equilibrium differential equation and the moment equilibrium differential equation of the micro-element; determining the buckling differential equation of the micro-element based on the equilibrium equation of the micro-element, wherein the buckling differential equation of the micro-element represents the total force and total deformation of the micro-element; and determining whether buckling phenomena have occurred in the tubing string to be tested based on the buckling differential equation of the micro-element.

The present application relates to the field of urban rail transit engineering and structural dynamics, and provides a sandwich and strain rate coupled subway tunnel lining dynamic mechanical property evaluation method and system, the method comprising the following steps: step 1, preparing a cement-based cylindrical sample containing a sandwich; step 2, applying a strain rate loading and collecting original data; step 3, reconstructing the stress-strain response and performing stress balance and constant strain rate criteria; step 4, obtaining energy absorption rate, dynamic compressive strength and yield inflection point strain, and recording the failure mode type; step 5, establishing a statistical damage model and inverting the model parameters; step 6, extracting the initial damage coefficient and damage rate, and establishing an empirical regression formula; step 7, constructing an evaluation index set, performing a grading evaluation, and outputting material optimization and process recommendations. The present scheme significantly improves the design, checking and rapid evaluation capability of subway tunnel lining under high strain rate conditions such as impact or explosion.

This invention discloses a method for stress relief through drilling with self-supporting sleeves in high-stress zones of deep coal seams. The method includes: 1. Obtaining the rock mechanics parameters of each stratum in the mining area; 2. Constructing an initial stress equilibrium model; 3. Dividing different areas in front of the working face into strong stress relief zones, medium stress relief zones, and weak stress relief zones; 4. Determining the basic parameters of the self-supporting sleeves; 5. Determining the number of self-supporting sleeve boreholes, the borehole length, and the borehole spacing; 6. Installing the self-supporting sleeves in the roadway sidewalls and relieving stress in the high-stress zones of the deep coal seams; 7. Calculating the stress relief interval and performing multiple drilling and stress relief operations on the deep coal seams within the self-supporting sleeves until the working face is mined back to a distance from the self-supporting sleeves that meets a set threshold. Through scientific numerical simulation and theoretical analysis, the optimal stress relief range and parameters are determined, enabling multiple drilling for stress relief. This effectively reduces stress concentration while improving the support strength and disturbance resistance of the surrounding rock in the roadway.

The application relates to the technical field of engineering design, in particular to a non-Darcy seepage stress coupling simulation method based on a fracture and matrix grid, information such as input fracture and matrix unit grids, boundary conditions, material parameters and control parameters is input; initial values and initial stresses of basic unknown quantities are given; at each time step, matrix seepage and embedded fracture non-Darcy flow iterative solving and matrix stress balance equation solving are sequentially carried out; whether convergence is judged, if the time step calculation does not converge, the next step iterative solving is continuously carried out; after the convergence condition is reached, the next time step solving is entered until the time ends. The application provides a high-precision and high-efficiency non-Darcy seepage stress coupling simulation method, and improves the problems of great difficulty in modeling of local structure surfaces, low efficiency and poor effect in traditional finite element solving, and can effectively simulate non-Darcy seepage characteristics and mechanical deformation behaviors of rock mass under high seepage pressure.

The invention relates to the technical field of thin stone installation, in particular to a stress balance installation method of a thin stone keel-free dry hanging system, and the method comprises the steps: obtaining the measurement data of a plurality of measurement points in a target area, and carrying out the real-time stress state calculation through the obtained measurement data; obtaining a stress state calculation result, diagnosing the calculation result, and identifying the stress unbalance type of the measuring point; and according to the stress unbalance type, a corresponding stress balance adjustment strategy is adopted to guide installation so as to ensure the stress balance of the system.

This invention discloses a method for evaluating the creep life of high-temperature pipelines based on a physical information neural network. The method includes: obtaining the three-dimensional residual stress distribution of the welded joint region of the high-temperature pipeline based on welding thermo-mechanical coupled finite element simulation or residual stress measurement, and using this as the initial stress field for creep analysis; based on the initial stress field, constructing a stress redistribution model considering service temperature, internal pressure, structural constraints, and material creep effects to obtain the stress field distribution evolving over time; based on the evolved stress field, constructing a physical information neural network model incorporating creep constitutive relations and stress balance constraints to predict the creep strain or creep damage evolution process in key areas of the welded joint, and determining the creep life of the high-temperature pipeline by combining creep failure criteria. This invention can reasonably reflect the relaxation and redistribution behavior of welded residual stress during long-term high-temperature service, thereby improving the reliability of creep life evaluation of high-temperature pipeline welded joints.

The present application relates to the technical field of steel-plastic plate preparation, and particularly relates to a preparation method of high-weather-resistance fine-steel anticorrosive steel-plastic plate, which comprises the following steps: preparing a steel-plastic plate base material by combining a first weather-resistance modified hot melt layer of a composite anticorrosive function back film and a first galvanized layer of a galvanized sheet; determining whether the structural stability of the steel-plastic plate base material is qualified based on a uniform morphology characterization parameter, and adjusting a temperature difference according to a difference; preparing a composite steel-plastic plate by combining a chemical conversion layer of a composite anticorrosive function front film and a second galvanized layer of the steel-plastic plate base material with qualified structural stability; determining whether the layer bonding reliability is qualified based on an interface wetting index, and adjusting a pressure or a walking speed according to a ratio; determining whether the stress balance of the composite steel-plastic plate is up to standard based on an interface stress matching coefficient, and adjusting a winding pressure according to a relative difference; and obtaining the high-weather-resistance fine-steel anticorrosive steel-plastic plate under the condition that the stress balance is up to standard. The present application improves the stability of the preparation of the high-weather-resistance fine-steel anticorrosive steel-plastic plate.

The application discloses a kind of based on stress balance's surrounding rock plastic damage zone analytical prediction method, belong to tunnel engineering technical field, including the following steps: obtaining initial plastic zone boundary;Based on plastic zone area correction model and lower than plastic stress part elastic stress distribution is invariable, obtain the elastic load summation of surrounding rock stress before adjustment lower than yield stress part and the elastic load summation of elastic zone after stress adjustment is equal when radius tends to infinity, and the elastic load summation of surrounding rock stress before adjustment higher than yield stress part and the summation of load of plastic zone after stress adjustment is equal;Based on stress balance principle, obtain the radius of surrounding rock plastic zone;Based on the radius of surrounding rock plastic zone and polar coordinate plotting, obtain the range and form distribution characteristics of tunnel surrounding rock plastic zone;The application solves the problem of insufficient accuracy of tunnel engineering surrounding rock plastic zone solution in stress prominent area.

The invention provides a method for determining the morphology of a corrosion pit of a thin-walled tube based on a phase field method, and the method comprises the steps: determining the current stress tensor of a virtual thin-walled tube based on an initial corrosion sequence parameter and a corrosion damage and stress balance equation, namely, determining the influence of corrosion on stress distribution, and obtaining the morphology of the corrosion pit of the thin-walled tube. And then, respectively determining equivalent plastic strain and hydrostatic pressure based on the current stress tensor, determining an interface dynamic coefficient through an interface dynamic coefficient equation based on the equivalent plastic strain and the water purification pressure, and substituting the interface dynamic coefficient into a phase field corrosion evolution equation to update a corrosion sequence parameter based on the interface dynamic coefficient, the interface dynamic coefficient is used for representing the acceleration effect of stress distribution on corrosion, that is, the influence of stress distribution on corrosion is further determined, so that the bidirectional coupling relationship between a phase field and a mechanical field can be realized, and the precision of pit evolution prediction of each round of local corrosion is improved.

The invention relates to the technical field of oil reservoir engineering, in particular to a formation collapse pressure measuring and calculating method and device combining seismic wave velocity and fault effect, and the method comprises the following steps: obtaining depth pressure and transverse and longitudinal wave velocity ratio of a target drilling well; establishing a collapse pressure calculation formula according to the relationship among the collapse pressure, the depth pressure and the structural influence; and calculating the formation collapse pressure according to the depth pressure, the transverse and longitudinal wave velocity ratio and the collapse pressure calculation formula. According to the method, rock physical characteristics of seismic wave velocity response are deeply excavated, a fault activity effect is utilized to express a stratum stress equilibrium state, rock elastic parameters which are complex and difficult to measure in a traditional Mohr-Coulomb criterion are replaced with transverse-longitudinal wave ratio and fault effect parameters, the calculation process is greatly simplified, the parameter acquisition difficulty is remarkably reduced, and the calculation efficiency is improved. The method has the multiple advantages of being easy and convenient to operate, high in timeliness, high in calculation efficiency and excellent in accuracy, and an innovative solution is provided for rapid and accurate measurement and calculation of the formation collapse pressure in drilling engineering.

The application discloses a pressure-bearing structure of an underground storage considering a most unfavorable working condition and a quantitative design method thereof, and is suitable for the technical field of underground engineering and comprises the following steps: S1, finding out mechanical boundary conditions of a multilayer structure, determining conditions of the underground storage and corresponding operation parameters; S2, obtaining the most unfavorable working condition of the underground storage based on the mechanical boundary conditions of the multilayer structure; S3, calculating relevant parameters of the pressure-bearing structure of the underground storage under the most unfavorable working condition according to a three-way stress balance equation and taking the parameters obtained in step S1 as input. The quantitative design method of each layer structure of the high internal pressure underground storage is proposed by setting a pressure-bearing mode of the pressure-bearing structure under the most unfavorable working condition and comprehensively considering classical theories; the pressure-bearing structure is considered from multiple conditions and multiple aspects, the underground storage is reduced to be restricted by hard conditions, and thus the stability and safety of the underground storage can be effectively improved.

The application discloses a hydrogen permeation-stress prediction method and device based on multi-scale data fusion, and relates to the technical field of material science. The hydrogen diffusion coefficient of hydrogen atoms in a metal pipeline material, stress field data distribution and experimental data are acquired, different scale data is preprocessed, and is mapped to a unified input space to construct a five-dimensional tensor feature matrix. A forward neural network model is constructed, the five-dimensional tensor feature matrix is taken as input, and the hydrogen diffusion equation and stress balance equation are embedded in a loss function for training, and key indicators are output for prediction. A reverse neural network model with target performance parameters as input is constructed, physical constraints are added during training, variable space is searched based on the predicted key indicators, and the optimal metal pipeline material parameter combination is acquired. The problems that the prior art has multi-scale data fusion difficulties, is difficult to adapt to complex working conditions, has low prediction efficiency, and cannot provide accurate and reliable hydrogen embrittlement prediction and prevention and control basis for hydrogen engineering are solved.

This invention discloses a general algorithm and supporting execution module for stress control and performance improvement of all-solid materials, belonging to the field of stress regulation and structural performance enhancement technology for solid materials. Based on a general adaptive algorithm and a dedicated closed-loop execution module, it achieves full-process control of detection-prediction-optimization-iteration through real-time stress sensing, intelligent decision-making, and global micro-compensation closed-loop regulation, achieving high-precision stress balance convergence for industrial all-solid materials and simultaneously improving structural stability and overall performance. It features a built-in manual intervention channel and hardware safety interlock, providing industrial-grade safety assurance and adaptability to stable operation under extreme conditions. The algorithm is implemented purely in software and can be deployed independently on existing computing platforms, or adapted to external devices or used in conjunction with this module to achieve optimal accuracy. Accuracy levels depend on the performance of external sensors and execution hardware. Overall performance is significantly superior to existing technologies and is suitable for various industrial fields with solid material stress control needs.

The invention relates to the technical field of bridge construction, and discloses a construction method based on a movable steel box girder road-crossing construction working platform, which comprises the following steps: building a light modular elevated track system above a bridge site to be built; the intelligent self-driven suspension type transfer crane is used for transporting the steel box girder segments to be spliced along the rail; during butt joint, the adjoint type dynamic stress balance system is started, active balance torque is applied to the installed segments through a stress balance arm so as to counteract cantilever disturbance torque of the segments to be spliced, and meanwhile the main gripper system conducts posture fine adjustment to achieve alignment. The connection operation is carried out by an independent welding work station, and the transfer crane can transport the next section in parallel. The system comprises the track system and a crane. Construction and the ground are decoupled, traffic is not interrupted, the method does not depend on a large site, the splicing precision is guaranteed through dynamic balance butt joint, and the construction efficiency is improved through parallel operation.

The present application belongs to the technical field of building materials, and relates to a seawater coral reef sand concrete damage effect test method. The present application determines the reference compressive strength through a uniaxial compression test, determines the driving parameters for formal impact by using a split Hopkinson pressure bar combined with pre-impact closed-loop calibration; based on the stress balance criterion, the effective waveform is screened to calculate the dynamic stress peak value, and the fragment dimension of the test piece is extracted; after normalization, the three are fused to calculate the damage effect index. The method effectively solves the problems of dynamic load mismatch, waveform distortion interference and single index difficulty in quantifying the irregular characteristics of crushing, realizes multi-dimensional comprehensive quantification of static reference, dynamic response and crushing form, and improves the repeatability of impact test data and the objective comparability of damage evaluation of different proportioning materials.