68 results about "Out stress" patented technology

The invention provides a finite element-based method for estimating pulling-out ultimate bearing capacity of a grouting screw anchor in gravelly soil, and relates to the technical field of civil structure engineering.A three-dimensional finite element model containing the grouting screw anchor and surrounding gravelly soil is established, model parameters cover the structure and material characteristics of the grouting screw anchor, and the grouting screw anchor and the surrounding gravelly soil are subjected to finite element modeling; a coordinate axis is established with the center of the anchor bottom as an original point for grid division, a stress concentration area is analyzed, principal stress is calculated to serve as critical bearing stress, vertical pull-out loads are applied step by step through a grouting pull-out test, a pull-out stress influence area is determined, soil stress of the area is analyzed, and soil binding power and friction force are calculated. And a grouting coefficient and a rock crack coefficient are generated, soil parameters are corrected, and the ultimate pulling bearing capacity of the grouting screw anchor is comprehensively obtained. According to the method, the pulling ultimate bearing capacity of the grouting screw anchor is accurately evaluated by establishing the three-dimensional finite element model and the graded loading experiment.

The invention relates to a large-scale high-temperature alloy blank casting method capable of controlling the casting size, and belongs to the technical field of high-temperature alloy casting. Measuring a temperature curve of the sand mold after the high-temperature alloy is poured; a process model is created, simulation software is used for carrying out stress deformation simulation, a part model of the casting is created, the simulation result of the part model and the simulation result of the process model are compared, the reduced scale, correction and the machining amount are adjusted in real time, and the process model is obtained; manufacturing a process pattern according to the process model, and producing a sand mold by utilizing the process pattern; creating a sand core model, inputting sand mold temperature curve parameters into simulation software, carrying out sand core deformation stress simulation, measuring sand core deformation stress, and manufacturing a core box according to the sand core model; a core bar is manufactured according to the design, the manufactured core bar is placed in a core box, and a sand core is manufactured; demolding the sand core; combining the sand core with the sand mold to obtain a casting cavity; and molten steel is poured into a casting cavity, and a casting blank is formed after cooling and solidification.

The invention discloses a multi-objective optimization method for stress-strain and high-frequency crosstalk of a laminated welding spot, which comprises the following steps of: establishing a finite element analysis model and a crosstalk analysis geometric model of the laminated welding spot through simulation software, and respectively carrying out stress-strain analysis and high-frequency crosstalk analysis to obtain a maximum stress-strain value, a near-end crosstalk value and a far-end crosstalk value of the welding spot; a response surface design method is adopted, different structure parameter factor horizontal combinations of the laminated welding spots are designed, simulation analysis is carried out, regression analysis is carried out according to the obtained result, a regression equation of stress strain, near-end crosstalk, far-end crosstalk and welding spot structure parameters is established, a multi-objective optimization model is established, and the welding spot structure parameters are optimized. And then multi-objective optimization is carried out in combination with response surface design and an MOEA / D algorithm, a Pareto optimal solution set is obtained, an optimal welding spot structure parameter combination of multi-objective optimization is obtained through entropy weight TOPSIS decision analysis, and simulation verification is carried out. The multi-objective optimization method is good in optimization effect and multiple in optimization objectives, and has a certain guiding effect on the aspect of welding spot structure optimization.

The invention relates to the technical field of solid drying, and discloses a rapid hardening and drying method and device for a silicate material. The method comprises the following steps: carrying out stress pre-regulation and double-shaft stirring on raw materials through three-dimensional network analysis to obtain slurry; a prefabricated part is prepared through partition pressure control and temperature gradient adjustment; carrying out acoustic emission signal acquisition and time-frequency analysis to evaluate a stress field; airflow drying is optimized by adopting an orthogonal fan array; differential treatment is carried out through a phased array microwave source; and finally, a finished product is obtained through ultrasonic stress elimination and speckle strain monitoring. Through multi-dimensional data acquisition, dynamic feedback adjustment and an intelligent control strategy, accurate stress regulation and control in the drying process are achieved.

The invention relates to the technical field of arc shaped energy-gathered blasting parameter design, and provides an arc shaped energy-gathered blasting parameter design method under a complex crustal stress condition, which comprises the following steps: establishing a double-hole blasting three-dimensional model comprising a rock mass, an arc explosive, an energy-gathered pipe and coupled air, applying a crustal stress boundary condition and carrying out stress initialization; setting material model parameters based on the test data; performing fluid-structure interaction dynamic response numerical simulation on the model by adopting LS-DYNA to obtain stress and strain response caused by blasting; and establishing evaluation indexes based on tensile stress, compressive stress and through crack formation, carrying out sensitivity analysis and optimization adjustment on key blasting parameters such as blast hole spacing, delayed detonation time, explosive loading amount and coupling coefficient, and finally determining an optimal blasting parameter combination in different stress states. The method can effectively meet the blasting operation requirement under the complex ground stress condition, the presplitting quality and the rock mass stability are remarkably improved, and the method has wide engineering application prospects.

The invention discloses an underwater block stone cushion vibration density parameter control method and system based on vibration settlement, and the method comprises the steps: S100, building a block stone cushion vibration density vibration system based on a spring-damping-concentrated mass theory; s200, carrying out stress analysis on a vibration system of the block stone cushion layer vibration density to obtain an overall kinetic equation of a vibration device and the block stone to be vibrated; s300, combining the overall kinetic equation in the step S200 with the displacement of the vibration system to obtain a third-order differential equation about elastic deformation; s400, combining the overall kinetic equation in the step S200 with a soil body reaction force to obtain a second-order differential equation about elastic deformation; s500, an iterative algorithm based on the Runge-Kutta method is compiled, the differential equation is solved, and a numerical solution of the differential equation is obtained; and S600, obtaining an output parameter in the vibration process, and adjusting an input value of the vibration system according to the output parameter. And the elasticity, damping and plastic deformation of the block stone cushion layer in the vibration compaction process are comprehensively considered.

The invention provides a method for calculating the loosening and collapsing depth of top arch surrounding rock. The method comprises the steps that S1, the arch crown height a, the tunnel radius b and the boundary angle theta 1 of an equivalent four-center arc are obtained; s2, on the basis of the data obtained in the step S1, drawing is conducted through a four-center method, and an elliptical caving arch is formed; s3, carrying out stress balance analysis on the self-stabilizing surrounding rock in the vertical direction to obtain a balance equation; s4, the balance equation is analyzed, a transcendental equation only containing one unknown quantity is obtained, and the unknown quantity is the included angle theta h between the surrounding rock friction force direction of the self-stabilizing surrounding rock and the vertical direction; and S5, solving the equilibrium equation through a numerical analysis method to obtain the slump depth. The cavern top arch surrounding rock collapse cavity depth can be accurately predicted, the surrounding rock supporting force is determined, and a reasonable dynamic design basis is provided for tunnel construction penetrating through a fault fracture zone.

The invention provides a basin-type insulator bubble defect detection method and system, electronic equipment and a storage medium, and relates to the technical field of insulation equipment fault diagnosis, and the method comprises the steps: building an ultrasonic stress detection system of a basin-type insulator; the method comprises the following steps: acquiring a defect-free basin-type insulator, performing stress detection, calculating a stress change rate, fitting, summarizing and performing probability statistics to form a defect-free regression curve set; obtaining a defective basin-type insulator to carry out stress detection, calculating a stress change rate, fitting and summarizing into a training fitting curve set; the defect-free regression curve set and the training fitting curve set are compared and checked, and an actual qualified threshold value is obtained; carrying out stress detection on the basin-type insulator to be detected to calculate a stress change rate, fitting and summarizing the stress change rate into a test fitting curve set; and comparing the defect-free regression curve set with the test fitting curve set to determine the position of the bubble defect. According to the invention, the detection cost of the basin-type insulator can be reduced, the efficiency is improved, the accuracy of the detection result is high, and the portability is strong.

The invention relates to the technical field of data processing, and discloses a multi-element weather-resistant different board design method. The method comprises the following steps: carrying out trapezoidal section design processing on a geometric structure of a different plate according to an axial stress distribution rule to obtain equal-width variable-thickness pulling parameters, and carrying out stress matching calculation processing on the equal-width variable-thickness pulling parameters through a mechanical analysis algorithm to obtain thickness-stress corresponding relation data; and carrying out weather resistance fusion treatment on the multi-element formula system and the thickness-stress corresponding relation data to obtain a material component distribution scheme, and carrying out hot rolling forming optimization treatment on a different plate manufacturing process according to the material component distribution scheme to obtain multi-element weather-resistant different plate design parameters. The technical problems that in an existing steel plate design, a geometric structure is not matched with axial stress distribution, and a multi-element formula system is lack of stress feature fusion design are solved. And meanwhile, the technical problems that a variable-thickness special-shaped plate manufacturing process lacks systematic optimization, and accurate forming control over equal-width and unequal-thickness structures cannot be achieved are solved.

The invention provides a mechanical property analysis method for a shield tunnel reinforced concrete segment. The method comprises the following steps: step 1, constructing an aggregate three-dimensional model database; 2, constructing a first aggregate accumulation model based on the aggregate three-dimensional model; 3, establishing a three-dimensional model of each part forming the concrete segment; step 4, constructing a three-dimensional model of the heterogeneous reinforced concrete duct piece; 5, constructing a stratum three-dimensional model and a grouting layer three-dimensional model; step 6, constructing a heterogeneous shield tunnel reinforced concrete segment three-dimensional model; and 7, carrying out stress analysis on the heterogeneous shield tunnel reinforced concrete segment three-dimensional model. According to the invention, the random distribution characteristics of the aggregate in the concrete and the interaction relationship between the aggregate and the concrete, between the reinforcing steel bar and the concrete and between the grouting layer can be reflected more truly, and the heterogeneity and complexity of the concrete microstructure can be captured more accurately, so that the mesomechanical characteristics of the duct piece in the stress process can be revealed more comprehensively.

The invention discloses a whole ship stress distribution inversion method based on finite strain monitoring data, and relates to the field of ship structure stress monitoring, and the method comprises the following steps: building a whole ship finite element model, and carrying out the initialization configuration of the finite element model; calculating a free vibration mode of the ship, and selecting a basic mode according to a vibration mode; monitoring equipment for monitoring the stress of the ship body is arranged at the ship body structure capable of reflecting the total longitudinal deformation characteristics of the ship body; and collecting monitoring data on the monitoring equipment, and carrying out stress inversion calculation based on a modal superposition method. According to the method, the weight coefficient of each order of basic mode in the actual response of the ship can be calculated based on the limited number of local monitoring equipment, and the stress response of the part without the measuring point is obtained through inversion, so that the real-time monitoring of the stress response of the whole ship structure is realized; the ship body structural stress inversion technology can provide guidance for structural safety inspection and fatigue analysis of the ship, and provides powerful technical support for ensuring safe operation and long-term stability of the ship.

The invention discloses a method for repairing damage of a surface carburized rod shaft type part accessory through laser cladding. The method comprises the following steps that a surface carburized layer of the carburized rod shaft type part accessory is removed; polishing and cleaning the surface to be repaired; according to the size of the surface loss of the accessory, corresponding cladding parameters are determined, and cladding repair is conducted; carrying out stress relief annealing treatment on the cladding repair part; and according to the original size of the accessory, the redundant cladding layer is removed through a machining method, and the accessory is recovered to the original size. According to the method, a surface carburized layer is removed firstly, then cladding parameters are selected according to the removal depth, and then repairing is conducted. Meanwhile, the hardness of a cladding layer is close to or even exceeds that of a carburized layer, and the use requirement is met.

The invention belongs to the technical field of water conservancy projects, and discloses an extra-high arch dam bank slope dam section concrete first bin high lift layer construction method which comprises the following steps: step 1, determining dam concrete construction layering, step 2, establishing a template support model, step 3, carrying out stress checking calculation and the like. According to the extra-high arch dam bank slope dam section concrete first bin high lift layer construction method, PKPM structural calculation software is combined with the structural form of a dam, the distance from an upstream excavation face is combined, a model is established for structural stress and stability analysis, high lift layer construction is achieved, the highest lift layer height is large, multi-bin parallel one-time pouring is achieved, the pressure of a standby bin is relieved, and the construction efficiency is improved. The construction efficiency is improved. According to the ultrahigh arch dam bank slope dam section concrete first bin high rising layer construction method, the pouring height and quality of each layer can be effectively controlled, the uniformity and compactness of concrete are ensured, and the construction precision of the whole structure is improved.

The invention provides a rubber bolt composite coaxial connection design method, a connection device and a preparation method of an FRP rib, and relates to the field of reinforcing members in building structures, the design method comprises the following steps: based on a cantilever beam structure of a jamming bolt bearing the shear stress of a bonding medium, obtaining the jamming resistance of the jamming bolt; the bearing capacity of the bonding medium is obtained based on a double-broken-line model; carrying out stress analysis on the FRP rib, the bonding medium and the sleeve to obtain total bearing capacity Fj; and obtaining structural design parameters of the sleeve, the jamming bolt and the bonding medium according to connection bearing critical conditions and mechanical parameters of the FRP rib. Through the combined action of the constraint force of the sleeve, the binding force of the binding medium and the blocking force of the blocking bolt, the coaxial connection deviation value of the FRP rib is dynamically compensated, so that the problems that the FRP rib is easy to slip, insufficient in centering degree, remarkable in stress concentration and performance degradation caused by long-term creep or shrinkage in the connection process are solved, and the service life of the FRP rib is prolonged. And high redundancy and high reliability are provided through multiple force transmission paths and an active compensation mechanism.

The application discloses a kind of prediction model establishment methods of exhaust heat end low cycle fatigue life, comprising the following steps: according to engine at different power, set different exhaust heat end model thermal boundary condition;According to each boundary condition respectively to exhaust heat end model is carried out stress field analysis, obtains the strain table of the maximum equivalent plastic strain increment of exhaust heat end and the temperature table of the maximum equivalent plastic strain increment corresponding node;According to the maximum equivalent plastic strain increment of exhaust heat end determines exhaust heat end life check component;Based on the temperature value in temperature table respectively to check component carries out high temperature tensile test and cold thermal shock cycle test, obtains the static tensile table of the material of life check component under corresponding temperature and test life table;According to static tensile table, test life table and strain table determine the prediction model of exhaust heat end, to predict the fatigue life of exhaust heat end, it is convenient to set up reasonably for the overhaul and replacement cycle of exhaust heat end.

The application discloses a kind of hot-rolled high-strength steel and its plate shape control and optimization method, belong to the production method field of hot-rolled high-strength steel.The tensile strength grade of hot-rolled high-strength steel is 500-700MPa, and the thickness is 2.0-12.0mm;Plate shape control and optimization method is obtained by slab heating, rough rolling, finish rolling, laminar cooling, coiling production process to get steel coil, send steel coil into bell type annealing furnace to carry out stress relief annealing treatment to obtain hot-rolled high-strength steel with good plate shape, annealing process is: from room temperature to 450-550 DEG C, heating time 3.5-4.5h;Annealing temperature 450-550 DEG C, annealing time 19.5-20.5h;Fire stop in bell type furnace furnace cooling, cooling to 180-220 DEG C, take out air cooling to room temperature.The method of the application can effectively solve the problem of uneven internal stress of existing hot-rolled steel plate, which leads to the problem of poor plate shape after the release of internal stress after subsequent steel plate uncoiling or dividing.

The application belongs to the field of aero-engine test, and particularly relates to a bird impact test group gun launching high-speed shell design method, which is based on the shape of a uniform thin-walled cylinder structure shell, constructs a three-dimensional numerical simulation model of the shell and a shell ejection device, calculates stress and deformation results of the shell when the shell impacts the shell ejection device at a high bird speed, and finds out stress weak positions and displacement weak positions of the structure; the minimum size bird body that can be accommodated in the middle section and the rear section of the shell is taken as a constraint, the minimum inner diameters of the middle section and the rear section of the shell and the optimal buckling mode of the shell are taken as optimization targets, and the shell structure is subjected to topology optimization to obtain an initial shell profile; the internal stress of the shell does not exceed the material failure stress, and the total mass of the shell does not exceed the original mass, which are taken as constraint conditions, and the maximum energy absorption of the front end of the shell and the minimum deformation of the middle section and the rear section are taken as optimization targets, and the shell structure is subjected to topology optimization of size and shape to obtain an optimized shell.

The invention belongs to the technical field of residual stress detection, and particularly relates to a residual stress detection method of an electroceramic material, electronic equipment and a storage medium, the method comprises the following steps: obtaining zero-stress samples of a to-be-detected electroceramic material component, the zero-stress samples comprising a zero-stress tensile sample and a zero-stress compression sample; in a first preset temperature range, zero stress acoustic time calibration is carried out on the zero stress sample, and a zero stress acoustic time value is determined; carrying out stress coefficient calibration on the zero-stress sample, and determining an acoustic elastic coefficient; within a second preset temperature range, performing ultrasonic detection on the to-be-detected electro-ceramic material component to obtain a target sound time value; and determining the residual stress value of the to-be-tested electro-ceramic material component based on the zero stress acoustic time value, the acoustic elasticity coefficient and the target acoustic time value. According to the technical scheme provided by the invention, the residual stress detection of the electroceramic material is realized, the quality monitoring in the network access and operation inspection process is enhanced, and the safe and stable operation of a power grid is ensured.

The invention discloses a construction scaffold safety diagnosis method based on multi-modal data fusion analysis, and the method comprises the steps: scanning a scaffold entity structure, and carrying out the modeling of a construction scaffold through a BIM technology; carrying out stress analysis on the basis of the scaffold model, and calculating and determining a safety parameter range of scaffold entity deformation and structural stress change on the basis of building construction scaffold safety technical specifications; the method comprises the following steps: acquiring structural stress data and deformation data of a scaffold, and preprocessing the data to obtain monitoring data; and extracting modal features from the monitoring data by adopting a parameter and modal correlation analysis method, fusing the modal features, and calculating a safety evaluation coefficient of the fused modal features based on a safety parameter range so as to judge the real-time safety state of the scaffold. According to the method, modeling and stress analysis are carried out on the scaffold in advance, so that the safety parameter range of a scaffold entity is determined, and finally the safety state of the scaffold is accurately judged by comparing the safety parameter range according to an actual data acquisition result.

The application discloses a kind of super-thick invar alloy plate of uniform organization and manufacturing method thereof, 6-9t invar alloy steel ingot is prepared by electric furnace→AOD refining→LF refining→VD refining→IC die casting process;Nb element is added in AOD refining process;After that, invar alloy steel ingot carries out stress relief annealing, and adopts three times upsetting and drawing process, upsetting reduction is according to the principle of increment, gradually refines steel ingot surface and heart grain structure, ensures that steel ingot internal organization is fully broken after recrystallization, then forged to target size after annealing, obtains invar alloy plate of thickness ≥50mm after air cooling;The application can prevent the grain coarsening of the heart of super-thick invar alloy plate with thickness greater than 50mm, and obtain super-thick invar alloy plate with grain size ≥4 levels and uniform organization.

The invention relates to a method and a system for reducing adhesive strength and related pull-out stress, and particularly discloses a method and a system for adhesively bonding a first substrate to a second substrate to reduce pull-out stress in a separation process of the first substrate and the second substrate. Comprising applying a first adhesive to a first bonding area of a bonding area of a first substrate, applying a second adhesive to a second bonding area of the bonding area of the first substrate, the adhesive strength of the second adhesive being lower than the adhesive strength of the first adhesive, pressing the first substrate and the second substrate against each other to form an adhesive bonding layer, and curing the first adhesive and the second adhesive for a predetermined period of time to form a cured adhesive bond layer between the first substrate and the second substrate.

The invention provides a multi-clamping-prevention PDC drill bit. The multi-clamping-prevention PDC drill bit comprises a drill bit body, a plurality of blades are arranged on the drill bit body at intervals, chip grooves are formed between the adjacent blades, stop block clamping prevention units are arranged in the chip grooves, fishtail-shaped clamping prevention units are arranged at the roots of the blades, and composite sheets and conical sharp teeth are arranged on the fishtail-shaped clamping prevention units. By means of the fishtail-shaped anti-clamping unit, fixed large falling blocks, key grooves and borehole steps can be subjected to back-scratching finishing, cutting and even crushing during lifting and back-scratching; the conical sharp teeth can be used for carrying out stress concentration crushing on falling blocks which are easy to move, so that the sizes of the falling blocks are reduced; by means of the stop block anti-blocking unit, large falling blocks falling from an upper well hole can be subjected to stress concentration crushing, the large falling blocks are prevented from falling into the well bottom and blocking a drill, existing falling blocks can be subjected to stress concentration crushing, the size of the falling blocks is reduced, and the falling blocks can be conveniently returned out in time. According to the invention, the occurrence probability of drill jamming can be reduced, the back-scratching jam releasing capability is improved, and the drilling period and cost are reduced.

The invention belongs to the technical field of bearings, and particularly relates to a large three-row cylindrical roller bearing initial clearance design method. The method comprises the following steps: firstly, according to actual working condition loading conditions such as pre-tightening force, axial load, radial load and overturning moment of a mounting bolt, carrying out stress analysis to determine the reduction amount delta a1 of the distance between axial raceway surfaces and the reduction amount delta r1 of the distance between radial raceway surfaces; secondly, according to the maximum permissible temperature difference delta T of the inner ring and the outer ring, the reduction amount delta a2 of the distance between the axial raceway surfaces and the reduction amount delta r2 of the distance between the radial raceway surfaces caused by the maximum permissible temperature difference delta T are determined; according to the form and location tolerance of machining, the reduction amount delta a4 of the axial clearance and the reduction amount delta r4 of the radial clearance of the bearing related to the form and location tolerance are determined. In addition, through stress analysis of the cylindrical roller, the axial working clearance ua and the radial working clearance ur when the cylindrical roller is subjected to the minimum load are determined. And finally, comprehensively considering factors such as stress condition, internal and external temperature difference, machining precision and the like, and determining an axial initial clearance ua0 = ua + deltaa1 + deltaa2-deltaa3 + deltaa4 and a radial initial clearance ur0 = ur + deltar1 + deltar2-deltar3 + deltar4 of the large three-row cylindrical roller bearing.

The invention discloses a design method of a three-period gear with an extremely-small curved surface structure. The method comprises the following steps: acquiring multiple groups of gear parameter sequences and three-period minimal curved surface characteristic parameter sequences to establish a three-period minimal curved surface-gear composite structure; carrying out stress analysis on the steel plate, and determining the maximum stress, the maximum stress position, the maximum deformation and the maximum deformation position; training a Stacking ensemble learning algorithm, and using the Stacking ensemble learning algorithm to obtain the output maximum stress, the maximum stress position, the maximum deformation and the predicted value of the maximum deformation position when the gear parameter sequence and the three-period minimum surface characteristic parameter sequence are input; and determining a final gear parameter sequence and a three-period minimum curved surface characteristic parameter sequence of the three-period minimum curved surface structure gear by using the predicted value and the target value. According to the scheme, the performance of the three-period minimal curved surface lattice composite structure gear can be accurately estimated, and modeling of the three-period minimal curved surface lattice structure gear with any complex characteristics is achieved.

The invention relates to a simulation method, system and equipment for the bending performance of a concrete laminated slab, and belongs to the technical field of concrete construction.The simulation method comprises the steps that a target laminated slab meeting the optimal limestone powder mixing amount interval is screened from different-formula composite limestone powder concrete laminated slabs; constructing a laminated slab model according to the concrete data corresponding to the target laminated slab, and verifying the reliability; after the verification is passed, carrying out stress analysis on the test piece plate in the laminated slab model to obtain a first simulation value of theoretical cracking bending moment and a second simulation value of normal section flexural bearing capacity; calculating a first standard value of the theoretical cracking bending moment of the test piece plate and a second standard value of the normal section flexural capacity according to the concrete current standard; calculating the deviation ratio of the simulation value and the standard value; and when the deviation ratio is greater than a set value, correcting the parameters of the laminated slab model. The method has the beneficial effect of quickly analyzing the bending performance of the laminated slab.

The invention provides an old brick-concrete structure bearing capacity evaluation and reinforcement optimization method and system, and relates to the technical field of building structure safety evaluation, and the method comprises the steps: collecting stress data, carrying out stress analysis and safety level evaluation through a deep learning neural network, determining a weak part, and generating an initial reinforcement scheme; reinforcing parameters are optimized in combination with the graph neural network and reinforcement learning, an optimal reinforcing scheme is output and executed, the safety condition of the old brick-concrete structure can be accurately evaluated, a customized reinforcing scheme is provided, and the structural safety and reinforcing efficiency are improved.

The invention relates to the technical field of metal material surface treatment and high-strength spring manufacturing, and discloses a stress shot blasting process and equipment for a high-strength spring, and the process comprises the following steps: carrying out hot shot blasting on a quenched spring, and forming initial dislocation by using cast steel shots; carrying out controllable water cooling on the spring, and inducing phase change to construct a tissue foundation; fine steel shots are used for secondary cold shot blasting, and grains are refined to construct middle-layer stress; carrying out stress shot blasting by using modified tungsten carbide to construct a deep gradient stress field; cleaning and tempering the spring, performing coating protection, and performing quality detection; the equipment comprises first hot shot blasting equipment, water cooling equipment, second cold shot blasting equipment, third stress shot blasting equipment and a control system. Through four-step cooperative treatment of hot shot blasting, controllable water cooling, cold shot blasting and final stress shot blasting, gradient residual compressive stress fields with depth and stability are constructed on the surface layer and the subsurface layer of the spring, cyclic load tensile stress borne by the spring in the service process is counteracted, and the fatigue performance of the finished spring is improved.

The invention discloses a sample structure for studying the progressive destruction process of a solid material, the sample structure comprises a solid sample with a continuously changing cross section area, the cross section area of the solid sample is gradually increased or decreased between two end faces, and a test method specifically comprises the following steps: selecting a test loading mode applied to the solid sample; placing the solid sample according to a mode that the cross section is from small to large, and carrying out stress loading on the upper end surface of the solid sample by using a selected test loading mode; performing primary in-situ scanning imaging on the sample; based on the in-situ scanning imaging image, obtaining damage development conditions of cracks, micro cracks and the like at different positions of the solid sample, so as to obtain structure evolution conditions of the solid sample under the action of different load levels; determining a progressive failure process of a material corresponding to the solid sample in a specific loading form; according to the invention, the deformation state and the structure evolution stage of the sample under different load levels can be obtained through one-time loading by utilizing the non-uniform section characteristic of the sample.

The invention provides a bridge structure stress state analysis method and device and a storage medium, and the method comprises the steps: carrying out the unit division of an integral bridge structure finite element model, traversing all divided units, and determining whether each unit comprises a key stress substructure; carrying out stress analysis on the first unit by adopting overall analysis based on the overall bridge structure finite element model to obtain a first analysis result; determining corresponding key stress parts according to stress characteristics of the key stress substructures, and determining boundary conditions required by modeling of a second unit according to actual measurement data acquired by corresponding monitoring sensors arranged at the corresponding key stress parts of the real bridge; performing unit division on the initial finite element model of the second unit, and inputting the boundary condition to obtain a second analysis result; and determining the stress state of the whole bridge structure in combination with the first analysis result and the second analysis result. By adopting the analysis method provided by the invention, the stress analysis can be more accurately and quickly carried out.

A method for determining the length of the anchoring and bonding section of a rock bolt to adapt to the disturbance of cyclic tunneling, a test borehole is constructed on the roof; a fixed monitoring device is installed in the test borehole; during the tunneling operation, the fixed monitoring device is used to collect and store vibration signals; a portable acquisition terminal is used to receive and store the vibration signals; an industrial computer is used to receive the vibration signals and analyze and process them to obtain vibration excitation data; an anchoring test piece is made; a low-frequency vibration simulation test system is used to obtain vibration signal data according to the similarity ratio, and the anchoring test piece is subjected to vibration excitation according to the vibration signal data; then, an electro-hydraulic servo mechanics test system is used for pull-out testing; and finally, the loosening damage degree of the anchoring interface corresponding to different bonding lengths of the anchoring test piece is analyzed by comprehensively analyzing the pull-out stress, displacement data and acoustic emission monitoring data during the pull-out test. The method can effectively determine the length of the anchoring and bonding section of the rock bolt to adapt to the disturbance of cyclic tunneling.