64 results about "Stress gradient" patented technology

The invention discloses a fatigue life simulation evaluation method for a lightweight aluminum alloy material of a new energy automobile, and relates to the technical field of material life evaluation. A microstructure image is collected, coupling features are extracted through machine learning, and heterogeneous data fusion and enhancement are completed; generating a topological optimization structure based on a GAN, introducing a VPSC model to describe anisotropy according to a stress gradient dynamic grid, and constructing a dynamic finite element model; fusing vehicle driving data, predicting a load by using LSTM, performing VMD decomposition and environment correction, and realizing space-time correlation load spectrum reconstruction; a phase field model is used in a microcosmic mode, cracks are tracked in a macroscopic mode through XFEM, damage parameters are transmitted in a bidirectional coupling mode, and multi-physics field coupling simulation is carried out; fusing simulation and test data by adopting Bayesian reasoning, calculating life probability distribution, and correcting parameters when errors exceed the limit; according to the method, the fatigue life prediction error is finally reduced, the time consumption of single simulation is reduced, full-life-cycle evaluation and visual early warning are realized, an efficient scheme is provided for lightweight design, and industrial technology upgrading is promoted.

The invention relates to the technical field of digital twinning, in particular to a hub type transmission device composite material performance prediction method based on digital twinning, which comprises the following steps: acquiring geometric information of a hub type transmission device, constructing a digital twinning analysis model, acquiring working condition information, dynamic balance parameters and corresponding response characteristics of the hub type transmission device in real time by using various sensors, and calculating the performance of the hub type transmission device. And establishing association mapping of geometric morphology, material characteristics and mechanical parameters, and generating a model parameter set. According to the method, through dynamic correlation mapping of geometric information, material characteristics and mechanical parameters and in combination with real-time working condition data, accurate simulation of the running state of the hub device is achieved, the precision of material wear trend prediction is optimized, the accuracy of crack propagation trend analysis is improved, and the fatigue damage rate is analyzed through the crack stress gradient and the fatigue damage rate. The reliability of material life prediction is remarkably enhanced, the material performance degradation level under the influence of multiple factors is quantified, and the accuracy of service performance evaluation of the hub type transmission device composite material is improved.

The invention discloses an intelligent monitoring system for construction environment pollution, particularly relates to the field of tunnel construction environment pollution monitoring, is used for solving the problems of pollution diffusion and risk assessment, and accurately calculates an air flow vector field through an intelligent air pollution monitoring system in combination with a fluid dynamics principle and a Navier-Stokes equation. Air flow and pollutant diffusion paths in a tunnel are disclosed. And constructing a pressure gradient field, quantifying the pressure difference and air exchange capacity between regions, and providing driving force analysis of pollutant diffusion. Calculating a pollutant transmission coefficient through nonlinear coupling calculation in combination with an air flow correlation degree, a pressure gradient field and an air exchange capability coefficient, and quantifying the pollutant transmission capability of adjacent regions; and then real-time evaluation and grading are carried out on pollution risks, high-risk areas are identified in time, and early warning information is pushed through the intelligent terminal. Therefore, the ventilation strategy is optimized, the energy consumption is reduced, and the health of constructors and the construction safety are guaranteed.

The invention relates to the technical field of machining defect monitoring, and discloses a machining defect real-time positioning and multi-physics field visualization system based on a multi-source track. The system comprises a multi-source trajectory data acquisition module for acquiring a cutter motion trajectory sequence, a temperature distribution sequence and surface topography monitoring data to form a multi-source trajectory data set; the multi-physics field reconstruction module processes the data set to generate defect distribution characteristics containing thermal stress gradient, force distribution cumulant and defect fluctuation coefficient; the defect positioning analysis module calls the pre-training model for real-time analysis and outputs a defect position predicted value and a defect type identifier; the environment compensation correction module corrects a defect position prediction value by combining a temperature distribution sequence and a material thermal characteristic incidence relation; and a visualization strategy generation module generates a multi-physical field visualization strategy set containing thermal field rendering and force field superposition schemes according to the defect type identifier.

The invention discloses a design method of a periodically-arranged porous thin-wall combustion chamber flame tube characteristic simulation piece, which comprises the following steps: carrying out fluid-thermal-solid coupling analysis in a real structure service environment, obtaining the temperature field distribution of a combustion chamber flame tube and the size and direction of a first principal stress, and determining a part with the maximum first principal stress as a dangerous part; inserting an initial crack into a dangerous part of a real component, carrying out crack propagation numerical simulation, and extracting a stress intensity factor change rule on a crack propagation path; on the basis of keeping key geometric characteristics of a periodically arranged porous structure, a simulation piece is configured and designed into a biaxial flat plate stretching piece, and stress gradient distribution of a real component is matched through porous array parameter optimization; a biaxial tensile testing machine is adopted to apply a multi-axial load to the simulation part, and it is ensured that the stress intensity factor amplitude under different crack lengths is kept consistent with that of a real component. The method has important engineering value for damage tolerance evaluation and life prediction of the aero-engine combustion chamber.

The invention belongs to the technical field of industrial detection, and provides a low-temperature fatigue crack propagation life prediction method and system based on a steel bridge deck, and the method comprises the steps: judging whether the crack direction deflection risk assessment needs to be started or not through the sharp reduction of steel plasticity and the non-uniform analysis of local stress gradient; if yes, the crack direction deflection risk of the steel bridge deck is evaluated by analyzing the grain orientation difference and the strengthening phase of the welding seam and the HAZ area; if the risk is high, a stress gradient gentle area is determined through a weld toe stress gradient cloud picture, a resistance-gradient coupling equation is established according to the minimum resistance principle and in combination with the stress gradient, and a crack deflection path is determined; dividing the crack crossing area according to the crack deflection path, calculating the actual propagation rate of the crack by combining the path proportion and stress gradient distribution of each stress gradient area after division, and correcting the life prediction output result, thereby improving the crack propagation path prediction precision and the fatigue life prediction evaluation precision.

The invention provides a porcelain insulator quality evaluation system based on multi-physics field coupling analysis, and relates to the technical field of rod-column porcelain insulator data processing.The porcelain insulator quality evaluation system adopts an electricity-heat-force multi-physics field joint simulation model to comprehensively reflect the heat accumulation and stress deformation effect caused by electric field concentration; an electric field concentration coefficient, a temperature rise trend coefficient and a stress gradient coefficient at a sharp point can be accurately captured, and degradation path prediction in a real operation environment is formed; according to the technology, the thread coupling abnormal index F alpha i of the ith rod-type column porcelain insulator is constructed, whether the thread structure has the risk of partial discharge, flashover or breakdown or not can be dynamically evaluated, and by introducing equivalent dielectric layer simulation of various environmental media, the simulation of the influence of various pollutants, attachments and climates on electric field concentration in reality is promoted; quantitative evaluation of the corona discharge risk of the sharp point is realized, and the reliability of the structural design of the insulator is promoted and improved.

The invention discloses an intelligent rock supporting method, and belongs to the technical field of rock supporting, and the intelligent rock supporting method comprises the steps that rock mass dynamic data are obtained through a rock mass stress sensor, a displacement sensor and environment monitoring equipment, and the rock mass dynamic data comprise rock mass stress, displacement, temperature and humidity; rock mass stress distribution is calculated based on rock mass dynamic data, and weak area coordinates and stress gradients are obtained; based on the weak area coordinates and the stress gradient, an optimal solution set of the anchor rod length, the pre-tightening force and the supporting plate thickness in the next construction is generated; and according to the optimization instruction, the work of the intelligent supporting device is dynamically adjusted, and the iterative optimization process is circulated until the construction is finished. Through the steps, the supporting scheme of the next supporting can be automatically adjusted according to the change of the rock mass stress after each supporting construction, so that the dynamic supporting scheme change of the stress state of the dynamically changed rock mass is realized.

The invention belongs to the field of geochemistry and tectonic geology research, and discloses a stress gradient analysis method based on directional change of saline inclusion in FIP. According to the method, the size, shape and distribution characteristics of the saline inclusion in the FIP in different directions are acquired and quantitatively analyzed through the system, and a stress gradient evolution model is constructed, so that the spatial change of a local tectonic stress field is revealed. Compared with a traditional stress analysis method mainly based on a macrostructure, the stress analysis method focuses on stress response behaviors under a microscopic scale, combines various precise test means such as microscopic observation, pressure measurement and cathode luminescence, and realizes a technical path of directly inverting the tectonic stress gradient from the microstructure. The method can be widely applied to geological research of structural environments such as fault zones and shear zones, provides a new technical means for crust stress field analysis, and has important research value and wide application prospects.

The invention provides an automatic dangerous rock identification method and system based on a machine vision system, and relates to the technical field of engineering mechanics, and the method comprises the steps: obtaining dangerous rock region image data containing disturbance amplitude and frequency, obtaining disturbance stress data, and carrying out the comprehensive analysis to calculate a rockburst failure load; the method comprises the following steps: establishing a relationship among a dynamic disturbance load, a stress gradient, a rockburst failure load and rockburst strength, calculating a stress-strength ratio and establishing a relationship between the stress-strength ratio and rockburst intensity, then extracting deformation and debris granularity characteristics, comprehensively generating a dangerous rock index, setting a safety threshold, and finally comparing the dangerous rock index with the safety threshold and sending out an early warning. According to the method, the image data, the high-resolution imaging equipment, the stress sensor and the numerical simulation method are utilized, automatic dangerous rock identification is achieved, the rockburst risk is effectively predicted, and regional safety is ensured.

The invention relates to the technical field of steel pile engineering simulation analysis, and discloses a steel pile oil cylinder stress and steel pile gravity center change model simulation analysis method, which comprises the following steps: acquiring oil cylinder pressure, steel pile displacement track data and geological parameters, and cleaning; extracting multi-dimensional features to generate dynamic load distribution parameters, and constructing a coupling relation model; the oil cylinder pressure and the steel pile displacement dynamic state are jointly verified, the space correspondence between the pressure gradient change and the gravity center shift is recognized, and the abnormal correlation is quantified; generating a system stability index, and judging whether to trigger control parameter correction; if correction is needed, a pressure compensation scheme is automatically generated. According to the method, through multi-dimensional data processing, coupling modeling and dynamic verification, precise analysis and intelligent control over oil cylinder stress and gravity center change in steel pile operation are achieved, the system stability and construction safety are improved, and the method is suitable for steel pile construction scenes such as ocean engineering.

The invention discloses a design method and system for a simulation part considering the stress gradient of a pre-rotated wheel disc, and relates to the technical field of wheel disc fatigue life detection.The method comprises the steps that a geometric model of the pre-rotated wheel disc is obtained, and physical property parameters of a wheel disc preparation material at different temperatures are determined; determining first maximum stress distribution of the non-pre-rotating wheel disc and the pre-rotating wheel disc according to the geometric model and the physical property parameters based on finite element simulation software; based on a stress gradient theory, determining an effective assessment distance of the maximum principal stress of the non-pre-rotating wheel disc and the pre-rotating wheel disc; determining second maximum stress distribution according to the first maximum stress distribution and an effective assessment distance between the maximum principal stress of the non-pre-rotating wheel disc and the maximum principal stress of the pre-rotating wheel disc; and according to the second maximum stress distribution, designing the key geometric dimension, the pre-stretching load and the fatigue load of the simulation piece. According to the invention, the design complexity of the simulation part can be reduced, and the fatigue change of the pre-rotated wheel disc can be effectively verified.

The invention relates to the technical field of topological optimization, in particular to a spot welding topological design and optimization system and method, and the system comprises a welding spot density regulation and control module, a welding heat input adjustment module, a welding spot spacing adaptation module, a welding spot stress detection module and a welding structure optimization module. According to the method, the distance and number of the welding spots are optimized through accurate recognition of the stress categories of the welding spots and bearing analysis, the overall stress balance of the structure is improved, the welding sequence is optimized, temperature fluctuation is reduced, the fatigue life of the welding spots is prolonged, the heat accumulation influence is reduced, and the distance between the welding spots is dynamically adjusted according to the stress gradient, the local bearing capacity and the material utilization rate are optimized; welding spot connection is optimized through stress transfer path analysis, stress concentration is avoided, stability is improved, welding spot topological structure adjustment is based on a load transfer path, the structural rigidity, strength and lightweight level are improved, the adaptability and economic benefits of a spot welding structure are enhanced, the welding spot distribution adaptability is enhanced through a multi-level optimization strategy, and the welding quality is improved.

The present invention provides a wind turbine main shaft design method based on stress field, comprising the following steps: S1, establishing a finite element model; S2, determining the stress gradient in the radial direction, and performing differentiated stratification; S3, assigning mechanical performance levels of different regions to different strata; S4, verifying the ultimate stress level and fatigue damage value of the main shaft; S5, performing structural optimization according to the verified stress and level and fatigue damage value. The main shaft finite element model is accurately layered and divided at different load levels, and the grid nodes between different levels are matched one by one through model optimization, so that the load can be smoothly transferred, and different mechanical performance parameters are assigned to different regions based on the actual performance levels of different thickness regions of the actual product. Avoiding the limitation of using a single performance indicator to represent the overall main shaft performance makes the finite element model of the main shaft closer to the actual load situation, thereby improving the design level of the main shaft and improving the competitiveness of the unit.

The application discloses a method for pre-judging blast furnace material collapse based on static pressure, which comprises the following steps: collecting data of a static pressure measuring point by a computer; linearly fitting a real-time static pressure measuring point value and a static pressure measuring point elevation to obtain a function, a slope of the function is used as a pressure gradient reflecting a blast furnace gas flow and a material feeding feature to draw a pressure gradient change curve with time, and when a curve at a current time t satisfies condition A and condition B, it is determined that the blast furnace has a possibility of material collapse. The application adopts a linear regression method for the static pressure to obtain the pressure gradient, compared with directly analyzing the static pressure or a segmented pressure difference, the analysis of the pressure gradient greatly reduces the difficulty and workload of a technical personnel in analyzing the blast furnace gas flow, in addition, the condition A and the condition B for pre-judging the material collapse are combined by using the "and" mode, the long-period analysis and the instantaneous value analysis of the pressure gradient are taken into account, and the accuracy and the scientificity of the pre-judgment of the material collapse are ensured.

According to the copper alloy strip residual stress rapid evaluation and improvement method based on stress feedback, a warping measurement value is accurately mapped into a stress gradient parameter through a deformation and stress conversion model, and the aging bottleneck of a traditional method is broken through; according to the method, a double-track regulation and control mechanism driven by a delta sigma threshold value is constructed, medium and low stress regions are passivated and homogenized by means of cerium salt grain boundaries, a high stress region is subjected to targeted shape protection by means of a cerium salt and thiomalic acid composite film, dialectical unification of stress release priority and overall etching efficiency is achieved on the molecular level, and a scientific and efficient stress management and control mode is provided for copper alloy strip manufacturing.

The present application relates to the technical field of steel pile engineering simulation analysis, and discloses a simulation analysis method for force of a steel pile oil cylinder and a model of change of the center of gravity of the steel pile, comprising the following steps: obtaining oil cylinder pressure, steel pile displacement trajectory data and geological parameters and cleaning; extracting multi-dimensional features to generate dynamic load distribution parameters and constructing a coupling relationship model; jointly verifying the oil cylinder pressure and the dynamic displacement of the steel pile, identifying the spatial correspondence of pressure gradient change and center of gravity deviation, and quantifying abnormal correlation; generating a system stability index to determine whether to trigger control parameter correction; if correction is required, a pressure compensation scheme is automatically generated. Through multi-dimensional data processing, coupling modeling and dynamic verification, the method realizes accurate analysis and intelligent control of the force of the oil cylinder and the change of the center of gravity in steel pile operation, improves the system stability and construction safety, and is suitable for steel pile construction scenes such as ocean engineering.

The disclosure relates to a technical field of engineering metals, in particular to a fatigue life prediction method based on notch type division by a modified field intensity approach, including: S1, carrying out elastic-plastic finite element analysis on a notched component to be analyzed, obtaining a stress-strain distribution, extracting a stress distribution on the most dangerous path of the notched component, and calculating a corresponding relative stress gradient; S2, dividing notch types according to an obtained relative stress gradient; S3, defining a field diameter of a corresponding notch according to different stagnation point positions; S4, according to a divided field diameter, bringing the field diameter divided into simplified one-dimensional field intensity approach models, and calculating a corresponding equivalent stress according to the divided field diameter; and S5, combining an S-N curve of a smooth material, and predicting the fatigue life of the notched component according to a calculated equivalent stress.

This invention discloses an adaptive compensation control method for uneven settlement in soft strata, belonging to the field of settlement control in geotechnical engineering. The method involves collecting distributed micro-strain field and pore water pressure gradient data at the bottom of the foundation in the soft strata and inputting them into a stratum rheological evolution prediction model. Multi-scale spatiotemporal features are extracted using a spatiotemporal attention coding module to generate a stratum creep trend vector. The equivalent modulus correction coefficient is calculated using a virtual stiffness reconstruction algorithm to generate a dynamic stress wave excitation parameter set. Coherent stress beams are emitted using microarray actuators embedded in the bearing layer interface, and a dynamic stress-locking zone is constructed through constructive interference to form a virtual rigid support. The excitation parameters are corrected through a dual-loop adaptive feedback control mechanism combined with a heuristic optimization algorithm until the micro-strain field returns to uniformity. Simultaneously, energy dissipation monitoring and safety mechanisms are added to mitigate the risk of soil liquefaction. This invention achieves active suppression and adaptive compensation for uneven settlement in soft strata, improving the accuracy of settlement control.

The invention discloses a method for evaluating a fracturing effect based on fracturing construction pressure and pump stopping pressure. The method comprises the following steps that S1, logging, fracturing and after-fracturing extraction data of a to-be-evaluated well are collected; s2, the perforation middle vertical depth of the target well section is extracted, and the fracturing construction pressure, the pump stopping pressure and the yield of the stable yield stage are counted; s3, calculating the bottom hole pressure P after the target well is processed; s4, calculating the bottom hole pressure gradient G after the target well is processed; s5, calculating the pump stopping pressure gradient G1 of the target well; s6, compiling and generating a pressure gradient ratio diagram according to the pressure gradient; s7, marking the well number and yield division of the corresponding target well on the pressure gradient ratio diagram.The method is suitable for the technical field of oil and gas reservoir development, the pressure data in fracturing construction are effectively compared, the ratio diagram is compiled, the fracturing effect and the relation between the pressure and the daily output are visually evaluated, and the method has the advantages of being high in practicability and easy to popularize. And the fracturing effect of the whole area can be reflected more effectively.

The invention relates to the technical field of tunnel advanced geological forecasting, in particular to an integrated multi-system advanced geological information obtaining and forecasting method and device. Side wall blast hole setting is executed in an excavation area, and hydrogeological information is collected; obtaining side wall geological comprehensive detection information through an infrared sensor, and drawing a surrounding rock stress gradient map; obtaining a comprehensive tunnel part of the abnormal geological structure of the tunnel through wireless networking communication; the geological structure in the tunnel hole is comprehensively forecasted through a mode switching mode, a TSP processing mode and a TGS processing mode, and information in front of a tunnel face and the like is collected; and obtaining information, executing switching, and sequentially drawing geologic body information of an excavation area so as to construct an advanced geological forecast. According to the invention, the wireless networking technology is adopted to simplify field wiring, the hardware adopts modular design to flexibly adapt to different engineering requirements, the data processing software supports secondary development and multiple mainstream algorithms, and the precision of tunnel geological forecast is improved from multiple attribute parameters.

The invention relates to an offshore wind power jacket pipe joint component design and manufacturing method, which comprises the following steps of: establishing a pipe joint parameterized geometric model by taking a deep sea shellfish shell growth mechanism as an initial topological structure; inputting the extreme environmental parameters of the sea area into a pre-constructed GAN model, performing fitting training by a generator in the GAN model, and outputting a gradient material space distribution scheme of jacket pipe nodes; performing optimization processing on the gradient material space distribution scheme based on a multi-target genetic algorithm to obtain an optimal solution of a target stress gradient and material distribution; by utilizing the growth mechanism of a deep-sea shellfish shell, the topological design of the pipe joint is realized, a large number of structural simulation analysis data and parameters are provided, the wall thickness of a steel plate of the pipe joint can be obviously reduced, the stress concentration phenomenon at the pipe joint is changed, the fatigue performance of the joint is improved, and meanwhile, the comprehensive manufacturing cost of the overall structure of the jacket is greatly reduced.

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.

The application discloses a deep ore body panel mining optimization method based on numerical simulation, comprising the following steps: 1, obtaining the stress gradient relationship of the mechanical parameters of the ore rock and the stress change with the buried depth of the to-be-optimized panel; 2, establishing a roof mechanical model considering the vertical load and the horizontal axial load to determine the limit span of the stope; 3, setting multiple groups of stope length, width and height parameter combinations under the constraint of the limit span, establishing a three-dimensional numerical model to simulate the stope excavation, and determining the optimal stope structure parameter combination by using the entropy weight-TOPSIS method according to the safety evaluation index and the economic evaluation index; 4, setting multiple stope mining sequence schemes, and determining the optimal mining sequence by step-by-step excavation simulation and entropy weight-TOPSIS comprehensive evaluation. The application can simultaneously consider the roof stability, excavation stress redistribution and mining economy, and provides a basis for the structure parameter design and the mining sequence determination of the deep high-stress gently inclined medium-thick ore body panel.

The invention relates to a connection hole site iterative optimization method based on multi-dimensional stress characteristic driving. The problems existing in layout optimization of connecting hole sites of plate / shell components at present are solved. Firstly, the center position of a design domain inner hole is parameterized; calculating at least two of equivalent stress, stress gradient, principal stress direction and strain energy density under a predefined load; calculating a comprehensive influence function through a method of normalizing and weighting the multi-dimensional features; carrying out iterative optimization on the position of the guide hole in the first principal stress direction, calculating a multi-dimensional stress feature and a comprehensive influence function in each iteration, and carrying out dynamic updating on a feasible region by considering geometric and process constraints at the same time; after iterative calculation convergence, a calculation result is output, and key index verification is carried out; checking whether geometric constraints and process manufacturing conditions are met or not; and generating a sample piece and carrying out physical test verification. According to the method, optimization of multiple performance targets such as strength, rigidity and fatigue life can be achieved, and the method can also be closely combined with engineering practical application.

The invention discloses a wheel disc characteristic structure simulation part design method based on an additive manufacturing thought, which comprises the following steps of: firstly, establishing a parameterized model of a wheel disc, and acquiring stress field data of a wheel disc characteristic structure by adopting a finite element analysis means; secondly, based on stress field data of the wheel disc feature structure, an MATLAB program is written to solve a stress gradient space curve; and finally, determining the initial section size of the simulation piece based on the test condition of the testing machine, determining a size iterative formula based on the additive manufacturing idea, iteratively calculating the profile curve of the simulation piece according to the stress gradient space curve, and determining the configuration of the simulation piece in combination with the test condition of the testing machine. Compared with the prior art, the method has the advantages that stress gradient path selection, design of the initial configuration of the simulation part and size optimization of the initial configuration are not needed in the whole design process, standardization and standardization of design of the wheel disc feature structure simulation part are greatly improved, repetition of the design process is fundamentally avoided, the design period is shortened, and the design efficiency is improved.

This invention discloses an experimental apparatus and method for a similar model of a rock wall expansion. The apparatus includes a transparent experimental chamber, a layered gelatin system, a terrain simulation system, a dynamic injection system, a multimodal monitoring system, and a data acquisition and processing system. By independently adjusting the stiffness and density ratios of the upper and lower gelatin layers, combined with a detachable double-slope terrain mold, a systematic study of the coupled effects of multiple factors such as terrain, stiffness layering, density layering, and injection rate is achieved. The three-dimensional morphological evolution of the rock wall is simultaneously monitored using a multi-view high-speed camera, and the full-field displacement field, strain field, and principal stress direction during the rock wall expansion process are inverted in real time using digital image correlation technology. This reveals the control mechanism of stress gradient reversal caused by terrain on the lateral expansion and cessation of the rock wall. Furthermore, dimensionless analysis and boundary correction improve the similarity between the model and the natural prototype, providing a reliable experimental platform for volcanic eruption prediction and magma transport law research.

The invention discloses a method for establishing a two-dimensional CMC turbine blade surface Nusselt number engineering empirical relational expression, which comprises the following steps of: systematically researching the flow and heat transfer characteristics of different pressure gradient areas such as a suction surface front edge, a suction surface tail edge and a pressure surface middle section, extracting geometrical characteristic parameters of surface textures, and introducing a dimensionless correction factor, so as to establish a two-dimensional CMC turbine blade surface Nusselt number engineering empirical relational expression. A Nusselt number correction model suitable for different areas is constructed, and a heat exchange coefficient mapping relation from a smooth surface to a woven texture surface is realized. Compared with a traditional smooth surface or a general roughness empirical correlation formula, the model established by the method can more accurately reflect the influence rule of weaving texture features on the surface heat exchange distribution of different pneumatic areas, and the engineering applicability and calculation precision of heat exchange prediction are remarkably improved; and a reliable engineering analysis method and technical support are provided for heat transfer design, performance evaluation and structure optimization of CMC turbine blades and other high-temperature composite material parts.

The present application proposes a method, device, electronic device and storage medium for characterizing crack evolution, which relates to the technical field of rock mechanics research. The method includes: obtaining reference stress-strain curves and reference stress values ​​corresponding to multiple reference rocks; determining a first stress gradient corresponding to a first type of rock based on the reference stress-strain curve and the reference stress value; obtaining scanning data of a reference rock sample under the first stress gradient; extracting the skeleton structure corresponding to each crack in the scanning data; determining a first characteristic parameter value corresponding to the reference rock sample based on the skeleton structure; and generating description information of the crack evolution of the first type of rock based on the first characteristic parameter value. The crack evolution process inside the rock can be quantitatively characterized, making the description information more intuitive, and providing conditions for improving the accuracy of predicting the rock failure time and state at the time of failure.