18 results about "Out stress" patented technology

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 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 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 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 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.

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.

The invention relates to a three-dimensional surface residual stress prediction method based on end milling thickness differential calculation and moving heat source simulation. The method comprises the following steps: calculating a tool path in an end milling process; differentiating the machined surface generated in one rotation period, and calculating the cutting width of any differential unit; the shear force and the ploughing force of any infinitesimal are calculated through the constitutive relation and coordinate conversion; calculating the mechanical stress distribution of any infinitesimal in a rotation period; setting a moving heat source to simulate and calculate the thermal stress distribution of any infinitesimal; mechanical stress and thermal stress are coupled, the residual stress value of each infinitesimal element is calculated, and stress elastic-plastic loading and unloading calculation in a rotation period is carried out; inputting the residual stress distribution into a side wall influence function, and calculating to obtain final residual stress distribution of any infinitesimal in a rotation period; and cyclic calculation is completed by using a superposition method, and the residual stress distribution of the fully-machined surface is obtained. Compared with the prior art, the method has the advantages of improving the precision of residual stress calculation and the like.

The invention discloses a residual life evaluation method and device for a mechanical spring, and belongs to the technical field of mechanical engineering, and the method comprises the steps: obtaining basic parameter information; performing fatigue analysis based on the basic parameter information and the historical use data; based on the initial predicted residual life, introducing load fluctuation, carrying out working stress and stress concentration factor conjoint analysis, introducing environmental change, carrying out working stress and surface treatment mode conjoint analysis, introducing material weakness distribution, and carrying out stress concentration factor and surface treatment mode conjoint analysis; and connecting a nano repair robot, repairing the target mechanical spring by using a programmable material, introducing multi-source monitoring equipment, obtaining a load fluctuation sequence, an environment change sequence and a material weakness distribution map, and obtaining a residual life evaluation result under the current working condition. According to the invention, the problem that the residual life of the mechanical spring cannot be accurately evaluated and the repair parameters cannot be optimized in a complex environment condition in the prior art is solved.

The invention discloses a simple chain-shaped dropper non-uniform arrangement method based on equal-elasticity space construction, relates to the technical field of bows, and aims at any cross-catenary, stress analysis is carried out on a positioner through a moment balance formula, a simulation model is constructed to carry out stress analysis on a positioning point, the optimal value of the distance between a first dropper and the positioning point is obtained, and the optimal value of the distance between the first dropper and the positioning point is calculated. The arrangement of the first dropper is completed; after the first droppers are arranged, the remaining droppers in the span area are arranged at equal intervals, a first sub-area and an adjacent second sub-area corresponding to the maximum elasticity of the span center area are analyzed through an equal-elasticity reference curve and an elastic gain, and the maximum elasticity of the two sub-areas is equal by adjusting the positions of the droppers on the left side and the right side of the second sub-area; therefore, an equal-elasticity space is constructed, and non-uniform arrangement of the simple chain-shaped droppers is completed. The problems that in the prior art, when the dynamic performance of the simple chain-shaped bow net system is improved, modeling and simulation are difficult, resources are consumed, and the simulation and actual deviation is large are solved.

The invention discloses an extrusion type basin normal fault identification method and device, and the method comprises the steps: building a spatial distribution pattern of a regional reverse fault based on a three-dimensional seismic data body after the inner horizon calibration of an extrusion type basin, and enabling the spatial distribution pattern to be used for determining the main trend of the regional reverse fault; the method comprises the following steps: under the background that an extrusion basin is in a compressive-torsional stress field, carrying out stress decomposition on the maximum principal compressive stress of a region to obtain a tensile stress component parallel to a main trend, and taking the tensile stress component as an optimal direction for normal fault identification; in the three-dimensional seismic data volume after horizon calibration, selecting an initial seismic section of which the orientation is parallel to a preferred direction, and executing small-interval translation scanning and / or small-angle rotation scanning on the initial seismic section to generate a series of scanning sections; and positioning the target position of the fault on a series of scanning profiles, and judging whether the hanging wall stratum moves downwards relative to the footwall stratum or not at the target position, and if so, identifying the fault as a normal fault. According to the invention, the normal fault of the extrusion basin can be accurately identified.

The invention relates to the technical field of building structure engineering, in particular to an unreinforced masonry structure bearing capacity degradation simulation and reinforcement effect evaluation method, which comprises the following steps: constructing a general physical model, carrying out stress analysis, setting initial parameters, and introducing an environmental influence factor based on humidity and temperature to correct a degradation rate; building a masonry compression and shear strength degradation model by combining a time decay rule and environmental influence, further building a bearing capacity time-varying model, and simulating and outputting an unreinforced masonry bearing capacity time-varying change rule through a programming tool; a composite wall is constructed by adopting an outer wrapped concrete slab, equivalent strength is calculated based on an area weighting method, a bearing capacity time-varying model is established, a bearing capacity change rule after reinforcement is obtained through simulation, and quantitative evaluation of the reinforcement effect is achieved by comparing the equivalent strength and the bearing capacity time-varying model. According to the method, the crossing from static evaluation to dynamic prediction can be realized, the prediction precision is high, the operation is convenient, and a scientific basis can be provided for safety identification, durability evaluation and reinforcement decision-making of the existing masonry structure.

The present application relates to the asymmetric force under fluctuating load bearing lining tunnel stability evaluation method, including: obtaining the two-way ground stress state around the tunnel, solving the asymmetric coefficient of stress;Establish the underground tunnel pressure bearing model and carry out stress analysis;Set the asymmetric load stress function, the elastic stress distribution is obtained by solving;Determine the function that the limit elastic principal stress of the first yield point of the tunnel satisfies, the first yield point position and its stress state are obtained by solving;Derive the stability condition of the tunnel structure under any stress, determine the safety load space and construct the plastic stress distribution conforming to the stability condition;Establish the self-balancing stress equation set of arbitrary load disturbance, the maximum value of the allowable stress value of the tunnel is obtained, and the safety allowable load range is drawn. The present application considers the asymmetric load condition of the tunnel, and has higher calculation accuracy and better application effect;The tunnel is analyzed in full plasticity, and the safety load obtained can well guarantee the stability of the structure.

The invention discloses a method for repairing a hatch cover of an ultra-large container ship without going down to the ground, which comprises the following steps of: a, carrying out stress analysis according to main parameters of the hatch cover, and confirming that a single tool pier meets the single-point 20-ton bearing capacity through calculation; b, counting 91 maintenance hatch covers of the whole ship, prefabricating 364 tool piers, and making load-bearing marks and number marks before use; c, after the ship enters a factory, the hatch cover is hoisted in situ through a gate seat hoisting rigging, and after the hatch cover is stabilized in the air, the tool pier enters a placing area; d, the tool pier is slowly moved to the position below four hatch cover limiting plates of the hatch cover; e, after the four tool piers are placed, workers evacuate from the hatch cover coverage area and return to the safety channel, the hatch cover falls on the tool piers through the gantry crane, and the workers overhaul the hatch cover. According to the method for repairing the hatch cover without going down the ground, the construction period in a dock is greatly shortened, the safety of the overhaul process is improved, and the cost is saved; and a solid foundation is laid for subsequent conventional repair of other ship types.

The invention discloses a maximum strain position measuring and positioning method, and relates to the technical field of vibration fatigue strength tests of engine blades and materials, and the method comprises the steps: building a three-dimensional geometric model of a to-be-tested blade 4, carrying out the finite element simulation analysis, obtaining a full-field strain distribution rule, and determining a region where the maximum strain distribution is located; resistance strain gauges are pasted on the central axis of the maximum strain distribution area of the blade back face at equal intervals, and the distance between the sensitive grid center of each resistance strain gauge and the blade root is recorded; applying resident excitation with constant amplitude under the resonant frequency of the to-be-tested blade 4, and collecting the strain value of the resistance strain gauge; constructing a matrix equation set of a strain distribution quadratic function, and solving coefficients to obtain a strain distribution function; and calculating the distance between the maximum strain position point and the blade root according to the strain distribution function, and pasting a resistance strain gauge at the maximum strain position point to carry out stress calibration measurement of the fatigue strength test.

The present application relates to bulk material storage equipment lining manufacturing technical field, disclose a kind of anti-arching lining and its forming method, including the pretreatment of lining matrix;Determine the geometric dimension and arrangement parameter of welding texture unit based on the geometric parameter of silo, and generate multiple rows of staggered arrangement welding path, the center line of adjacent row welding texture unit is with the length direction of lining matrix preset acute angle angle;According to welding path, carry out automatic welding to form metallurgical bonding staggered arrangement welding texture unit;Surface shaping treatment is carried out to welding texture unit;Carry out stress relief treatment after welding and performance detection, the present application provides a kind of anti-arching lining and its forming method, can improve the wear life and structural reliability of lining.

A kind of repair method of centrifugal casting hot die, comprising the following steps: S1, the damaged area of pipe mould is removed using milling head, forming the standard pit to be repaired;S2, the standard pit formed in step S1 is repaired three-dimensionally using laser cladding head;S3, repeat step S1 and step S2 until all areas of pipe mould are repaired;S4, replace milling head with grinding head, polish the surface of all repaired areas to make the surface smooth;S5, stress relief annealing is carried out on the repaired part of pipe mould.The repair method uses mechanization to remove the damaged area of pipe mould to form standard pit, then fills the standard pit using laser cladding method and polishes it to be smooth, which can not only repair internal cracks of pipe mould, but also repair external damage of pipe mould, and further cooperate with professional heat treatment equipment to carry out stress relief annealing after laser three-dimensional repair, with high production efficiency, and standardized operation also improves the quality of repair.