38 results about "Stress–strain analysis" patented technology

A method and system for performing continuous (real-time) physics based prognostics analysis as a function of actual engine usage and changing operating environment. A rule-based mission profile analysis is conducted to determine the mission variability which yields variability in the type of thermal-mechanical loads that an engine is subjected to during use. This is followed by combustor modeling to predict combustion liner temperatures and combustion nozzle plane temperature distributions as a function of engine usage which is followed by off-design engine modeling to determine the pitch-line temperatures in hot gas path components and thermodynamic modeling to compute the component temperature profiles of the components for different stages of the turbine. This is automatically followed by finite element(FE) based non-linear stress-strain analysis using an real-time FE solver and physics based damage accumulation, life consumption and residual life prediction analyses using microstructural modeling based damage and fracture analysis techniques.

The invention provides a double safety and effectiveness inspection method of human lumbar bone and implant, and belongs to the field of medicine. The method comprises the following steps: acquiring a 3D (three-dimensional) rendering model of lumbar body bone, lumbar disc and interspinous ligament by a 3D reconstruction technology; performing 3D grid division to the 3D rendering model, and giving attributes of a heterogeneous material to the 3D rendering model; performing 3D modeling to an implant; assembling the lumbar body bone, the lumbar disc, the interspinous ligament and the implant, and analyzing stress and strain of the assembly by adopting uniformly distributed nodal load through a finite element analysis method; simulating visible finite element analysis by a computer before the implant is implanted into a human body. Therefore, the verification requirement to bone and implant double safety and effectiveness can be fulfilled, the damage of the implant to original human lumbar bones can be prevented, double safety and effectiveness of the bones and implant can be guaranteed, the manufacture cost can be effectively reduced along with convenience and quickness, and individual and industrial manufacturing of a human lumbar bone implant can be realized. The method is applicable in the field of implant stress-strain analysis in the orthopedics department.

The invention researches the substantive characteristics of material deformation to aim at the practical problem of measuring real stress-real strain and discloses a real stress-real strain calculating model and a practical testing system: 1, based on the analysis on the deformation of a tension specimen, taking a unit body the special part of which is provided with characteristics as the object for the stress-strain analysis, building a unique full-deformation unit model, firstly solving the theory analysis problem of real stress-real strain, establishing a theory foundation and building a novel real stress-real strain calculating formula: Sigma i is equal to 4Fi / Pi d<2>I and Epsilon is equal to (d<2>0 / d<2>i) minus 1; 2, adopting a machine visual technology and an image processing method to develop a practical software system and a practical hardware system that are compatible with the machine visual technology and the image processing method, and realizing the direct non-contact real stress-real strain measuring in real meaning; 3, the testing system includes a light source (1), CCD camera (2), an image acquisition card (3), a data acquisition card (4) and a material testing machine (5); 4,the software includes image capturing program, load data acquisition program and comprehensive calculation analysis program.

The invention relates to a multiscale prediction method for the mechanical property of a woven composite material. The method comprises the following steps that 1), an initial parameter is input; 2), elastic stiffness matrixes of a fiber / basal body scale, a fiber bundle scale and a unit cell scale are computed sequentially according to a bottom-to-top homogenization process; 3), a multiscale incidence matrix is constructed; 4), stress-strain analysis is performed on unit cell entirety, stress is decomposed by the multiscale incidence matrix from top to bottom, and stress-strain fields under all the scales are obtained synchronously; 5), whether an ingredient material is in a failure is judged according to respective failure criteria of a fiber and a basal body; if so, the corresponding ingredient material is subjected to stiffness reduction; 6), whether the unit cell entirety is in a failure is judged, and if so, Step 7) is executed, or else, a next displacement increment is added and Step 2) is returned; and 7), stiffness and strength computation results of the woven composite material are output. Compared with the prior art, the method has the advantages of high computation efficiency, high precision, high universality and the like.

The invention discloses a method for automatically converting data between dynamics analysis software and finite element analysis software, comprising the following steps of: starting the finite element analysis software to perform model flexiblization and outputting a modal neutral file (MNF); starting the dynamics analysis software, loading a virtual prototype model, reading the MNF, performing kinematics and dynamics analysis and outputting a load file; applying a load in the load file to a flexible body, performing stress and strain analysis on the flexible body and outputting stress and strain data; and circularly performing the steps and outputting an optimal operating condition and the stress and strain data. The method for automatically converting data can really integrate the powerful finite element function of the finite element analysis software and the powerful dynamics analysis function of the dynamics analysis software for combined application and provide an automatic, simple, convenient, high-efficiency and reliable realization means for achieving the mechanical property analysis and the operating condition analysis of a mechanical system.

Provided are a stress analysis method and stress analysis equipment that enable a detailed stress measurement, by using both a photoelasticity measurement method and a stress measurement (mechanoluminescence measurement) which utilizes a mechanoluminescent substance to measure a stress state of an object. Physical quantities that are measurable include individual principal stress component and a principal stress direction. The photoelasticity measurement method alone cannot measure individual principal stress component values.

The present invention discloses a welded member fatigue stress and strain real-time non-contact type monitoring method. According to the method, the welded member welding seam and a certain surrounding area are subjected to grid division with a certain interval, each grid intersection point is adopted as an infinitesimal body as the stress and strain analysis unit, the feature information of the pixel points of all infinitesimal bodies in the area to be measured during the fatigue load acting process are extracted through a machine vision monitoring system when the fatigue load acts on the member, the collected member image is subjected to pixel point matching, the relation between the stress and strain change law and the image feature is established so as to obtain the feature change of the infinitesimal body during the fatigue load acting process, and finally the strain value and stress distribution law and the stress strain evolution law during the fatigue process are obtained. The method of the present invention is used for solving the monitoring problem of the stress and strain status distribution and evolution law of the welded member in the steel structure under the fatigue load acting.

The invention relates to a flexible resistance type strain sensor comprising an insulating flexible substrate and a metal glass film. The metal glass film as a strain sensitive material is deposited on the flexible substrate. According to the flexible resistance type strain sensor, because of the metal glass film as the strain sensitive material, the flexible resistance type strain sensor has advantages of high sensitivity, large measuring strain range, small resistance temperature coefficient, and simple preparation method and the like; and thus the sensor can be used as a basic unit of the electronic skin and can be applied to fields of the stress-strain analysis and the like widely.

The invention discloses a method for evaluating the risk of a contact fatigue failure of a surface hardened gear. The method includes the first step of calculating contact parameters of a meshing position according to the geometry kinematics of a gear pair, and establishing a contact analysis model; the second step of performing contact stress and strain analysis based on the gear pair contact analysis model, and obtaining an equivalent shear stress of a complex multiaxial stress field; the third step of estimating the local material strength of the gear according to a hardness curve of the gear material and material parameters; the fourth step of converting residual stress into an equivalent shear stress according to a residual stress curve of the gear material; and the fifth step of dividing the equivalent shear stress by the local material strength of the gear, to obtain an exposure value of any point of a key contact area. The method for evaluating the risk of the contact fatigue failure of the surface hardened gear has the advantages that the long-standing technical problems in the machinery industry are solved, the risk of the contact fatigue failure of the gear can be effectively estimated, and the basis is provided for the design, manufacture, and use of gears.

The invention discloses a groove testing rack for underwater inspection of a diversion tunnel door gate groove of a hydropower station and a construction method. The groove testing rack includes a side column, a girder and a carling, wherein the girder includes a girder web and a girder flange; the side column includes a side column web and a side column flange; the carling includes a carling web and a carling flange; a sliding block is connected to the side column, a rib plate is arranged on the side column, and a side sliding block is connected to the rib plate; a lifting lug is connected to the girder, and a lifting shaft is connected to the lifting lug. The construction method for using the groove testing rack to perform underwater inspection comprises the following steps of: a, construction preparation; b, design of the groove testing rack; c, stress strain analysis of the groove testing rack; d, arrangement of a lifting system; e, installation of the groove testing rack; f, test running of the groove testing rack; g, inspection of the gate groove; h, inspection of a bottom sill. The construction method directly uses an underwater camera and other inspection devices to inspect the gate groove and the bottom sill by underwater shooting, so that the inspection on the diversion tunnel door gate groove and the bottom sill can be completed without raising the water level.

The present invention discloses an analysis and judgment method for the fatigue life of a fusion reactor divertor. According to the method, firstly, a complex load applied onto a divertor in a service environment is converted into a temperature and stress-time changing course. Secondly, a series of cycle counting sections during an irregular stress course are subjected to the rain-flow counting treatment. Thirdly, for each counting section, an elastic stress range thereof is obtained according to a numerical analysis result. Fourthly, based on a stress-strain analysis formula, the stress result of the finite element elasticity analysis is converted into the total cycle strain range of the above counting section. Fifthly, according to the cycle strain fatigue life curve of materials, different stress levels are subjected to the quantization of the fatigue damage. Sixthly, a fatigue damage value corresponding to each cycle of each counting section during the stress course can be obtained. According to the technical scheme of the invention, a given service environment is subjected to result evaluation. Therefore, related protective measures and maintenance recommendations are provided, or improvement opinions are provided for the design of the divertor. As a result, an obtained evaluation result is more objective and more real for engineering practices.

The invention discloses a stress real-time monitoring system applied to a forklift truck body structure, which comprises a stress-strain analyzer, a resistance strain gauge, a vehicle-mounted industrial personal computer, a display alarm and a forklift truck body, wherein a data output interface of the resistance strain gauge is connected with the stress-strain analyzer, an input interface of thevehicle-mounted industrial personal computer is connected with a data output interface of the stress-strain analyzer, and an output interface of the vehicle-mounted industrial personal computer is connected with the display alarm. The invention also discloses a control method of the stress real-time monitoring system applied to the forklift truck body structure. According to the method, the maximum load, the maximum stress and the position information of the maximum stress of the forklift under each working posture are obtained based on finite element analysis, the early warning and the activecontrol of the posture, the load and the stress of the forklift truck body under the working condition data of the forklift truck body are realized, an operator can know the safety of the forklift truck body structure in real time, a driver is guided to stop dangerous operations such as overload and over-angle, and the safety of the forklift truck body is improved.

The invention belongs to the field of a virtual manufacturing system for constructing the process of cold bend forming by using CATIA software. Aiming the problem that the prior roller can only be used after field modification, the invention uses the virtual function of the CATIA software to develop the cold bend forming virtual manufacturing system. The system uses V-B language to compile and is connected with the CATIA software, and comprises a general platform, a part generating program calling platform and an assembly platform, wherein the general platform is a general system interface, the part generating program calling platform can call programs of various rollers, and a three-dimensional drawing and an engineering drawing are showed on the CATIA software after data input. The assembly platform virtualizes the rolling process after a rolling sequence list and space coordinates during the rolling of the rollers are inputted, analyzes and amends the stress-strain of the rollers during rolling, evaluates and amends the rolling quality and finally outputs the qualified roller data by data stream. The proposal comprises the steps: 1) establishing the general platform; 2) establishing the part generating program calling platform; 3) establishing the assembly platform; 4) establishing a roller part virtual module of the part generating program calling platform; 5) establishing a rolling process virtual module; 6) establishing a stress-strain analyzing module; 7) establishing a rolling quality analyzing and amending module; and 8) establishing a roller manufacturing data stream output module.

The invention relates to the technical field of optical fiber detection, in particular to a high-temperature total stress-strain curve testing method and device based on an optical fiber, and the method comprises the steps: carrying out a tensile experiment of a preset tensile rate on an optical fiber test part at different temperatures; obtaining a tension load applied to the optical fiber test part at each temperature and the cavity length of an optical fiber sensor in the optical fiber test piece at each temperature; and calculating the stress and strain at each temperature according to thetension load at each temperature and the cavity length of the optical fiber sensor in the optical fiber test part, and performing fitting to obtain a stress-strain curve. According to the technical scheme of the embodiment of the invention, the optical fiber test part is subjected to tensile experiments at different temperatures; and the stress-strain of the optical fiber sensor at each temperature is calculated according to the obtained cavity length and tension load, so accurate data can be provided for stress-strain analysis of the optical fiber sensor at different temperatures, and the actual stress-strain of the optical fiber sensor in different temperature environments can be truly measured.

The invention relates to a finite element analysis method of a piston. The method comprises the following steps: establishing a geometric model of the piston comprising an aluminum alloy matrix and analuminum oxide ceramic fiber composite material part; establishing a model of a piston-related component comprising a piston pin, a connecting rod and a sleeve cylinder; importing the geometric modelof the piston and related components into CAE analysis software, partially bonding the aluminum alloy matrix to the aluminum oxide ceramic fiber composite material together by using a bonding command, and defining the material attributes of the aluminum alloy matrix and the aluminum oxide ceramic fiber composite material as aluminum alloy or aluminum oxide ceramic fiber composite material to obtain a model 1 or a model 2; dividing grids; applying constraints; simulating actual working conditions to perform temperature and mechanical loading, and calculating stress and strain analysis resultsof the model 1 or the model 2; and importing the calculation result in the step 6 into fatigue analysis software to obtain a fatigue calculation result of the model 1 or the model 2. Unified materialattributes are adopted, residual stress caused by poor material performance is effectively avoided, and an analysis result is more accurate.

The invention relates to the technical field of automobile, in particular to a method and device for matching automobile steel rim material. The method comprises the step of establishing a 3D model of a wheel steel rim, establishing a material mechanical performance parameter library of the wheel steel rim, combining the wheel steel rim 3D model and the parameter library, generating a finite element stress and strain calculation model, using the finite element stress and strain calculation model to analyze stress and strain nephogram distribution of the corresponding material on the wheel steel ring 3D model, using Miner-Brown fatigue life model for analysis to acquire a fatigue life nephogram distribution of wheel steel ring 3D model, and selecting the material corresponding to the longest fatigue life in the wheel steel ring 3D model as the automobile steel rim material. The device for matching automobile steel rim material comprises a 3D modeling unit, a parameter library unit, a stress and strain modeling unit, a stress and strain analysis unit, a fatigue life analysis unit and a material selection unit. The method and device for matching automobile steel rim material can accurately match up best materials for steel rim spoke and steel rim, and enhance the fatigue life of the wheel steel rim.

The invention discloses a pile-supported embankment multi-layer reinforced body reinforcing technology based on numerical simulation, which specifically comprises the following steps of: establishing a multi-layer reinforced pile-supported embankment numerical model by utilizing finite element software, and calculating and analyzing a working mechanism of a multi-layer reinforced body; and based on the stress-strain analysis result of each layer of reinforced body in the reinforced cushion layer, optimizing the strength grade of each layer of reinforced body in the reinforced cushion layer, and guiding the refined design of the pile-supported reinforced embankment. The cooperative bearing mechanism of all the layers of reinforced bodies in the reinforced cushion layer is deeply researched, it can be guaranteed that the strength of all the layers of reinforced bodies is fully exerted, vertical and horizontal displacement of the embankment is effectively controlled, on one hand, the long-term stability of the pile-supported reinforced embankment can be maintained, and on the other hand, material waste caused by unreasonable design of the multiple layers of reinforced bodies can be avoided.

A nuclear reactor fuel early deformation analysis method based on a particle method mainly comprises the following steps: 1, establishing a geometric model, and setting particle physical property and mechanical parameters; 2, establishing a particle neighborhood domain; 3, calculating a solid boundary particle external force load based on boundary conditions and a solid collision model; 4, calculating temperature and calculating thermal expansion strain based on a thermal expansion model; 5, calculating plastic strain and elastic stress strain of the continuous medium particles in the solid based on the elastic model, the elastic-plastic model and the plastic model; 6, judging whether breakage occurs or not and updating the speed and the position of the particles; and 7, outputting a calculation result. The method can be used for analyzing the fuel early deformation behavior of the nuclear reactor in a serious accident; based on a particle method, the problem of grid distortion in a grid method can be effectively avoided; and the method is a pure Lagrange kernel method, and can effectively avoid tensile instability in the stress-strain analysis process.

The invention discloses a method for judging the rupture risk of a reconstructed ear scaffold. The method comprises the following steps that: S1: scanning the ear scaffold, and obtaining the outline data of the ear scaffold; S2: importing an entity model into geomagic FreeFrom&touch X software to carry out hook face repairing; S3: generating a Nurbs hook surface; S4: importing the IGES (The Initial Graphics Exchange Specification) format of S3 into HyperMesh14.0 software to establish a finite element model; S5: importing a three-dimensional finite element ear model which is obtained in S4 andcontains cartilages and different skin thicknesses into finite element specialty analysis software Abaqus to carry out finite element analysis; and S6: obtaining a stress-strain analysis result of cartilages, skin, cartilage deformation and skin deformation, and judging the rupture risk of the ear scaffold according to the finite element stress result. By use of the method, a situation that the rupture may happen when the ear scaffold is used can be evaluated in advance, and a rupture possibility is lowered.

The present invention provides a stress-strain digital data processing method for strengthening the face of broken and weak surrounding rock, including: S100 establishes a three-dimensional model of the face of broken and weak surrounding rock according to the project design, and performs virtual finite element segmentation to form the face of the face 3D finite element model; S200 detects and saves the basic data of the surrounding rock face during section excavation; S300 combines basic data and 3D finite element Adhesive repair demand strength of the rock face; S400 selects reinforcement measures for the surrounding rock face according to the adhesive repair demand strength, and introduces the reinforcement measures into the 3D finite element model for effectiveness analysis. This method can improve the analysis efficiency and effectiveness of the stress-strain data of the broken and weak surrounding rock face reinforcement, improve the analysis accuracy, and guide the reinforcement of the surrounding rock, which can ensure the reinforcement effect, avoid reinforcement failure, and control the reinforcement cost of the surrounding rock.

The invention provides a demand-oriented geometric feature-driving turbine disc structure interactive design method. The interactive design method comprises following steps of 1, inputting coordinate values of control points of a turbine disc two-dimensional geometrical configuration; 2, establishing a turbine disc axisymmetric finite element model for the turbine disc two-dimensional geometrical configuration; 3, carrying out structural analysis on the established turbine disc axisymmetric finite element model; and 4, in dependence on the design demand, changing the turbine disc two-dimensional geometrical configuration, and automatically displaying the coordinate values of the control points of the turbine disc two-dimensional geometrical configuration, establishing the turbine disc axisymmetric finite element model and carrying out finite element calculation. Through the above steps, the control points of the turbine disc two-dimensional geometrical configuration can be dragged by a mouse, turbine disc weight calculation, stress-strain analysis, fatigue life prediction, meridian plane burst speed calculation and radial burst speed calculation are automatically carried out, the turbine disc structure design efficiency is improved, and the case that during the previous design process, once the scheme is changed, modeling needs to be carried out again manually, and therefore time and manpower are wasted is avoided.

The present disclosure relates to the technical field of optical fiber detection, and in particular to a method and device for testing an optical fiber-based high-temperature full stress-strain curve. The tensile load applied to the fiber optic specimen at different temperatures and the cavity length of the fiber optic sensor in the fiber optic specimen at each temperature; according to the tensile load at each temperature and the cavity length of the fiber optic sensor in the fiber optic specimen, calculate the stress and strain, and fit the stress-strain curve. The technical solutions of the embodiments of the present disclosure carry out tensile experiments on optical fiber specimens at different temperatures, and calculate the stress and strain of the optical fiber sensor at each temperature according to the obtained cavity length and tensile load, which can provide optical fiber sensors at different temperatures. The stress-strain analysis provides accurate data, which can truly measure the actual stress and strain of the fiber optic sensor under different temperature environments.

The invention relates to a flexible resistance type strain sensor comprising an insulating flexible substrate and a metal glass film. The metal glass film as a strain sensitive material is deposited on the flexible substrate. According to the flexible resistance type strain sensor, because of the metal glass film as the strain sensitive material, the flexible resistance type strain sensor has advantages of high sensitivity, large measuring strain range, small resistance temperature coefficient, and simple preparation method and the like; and thus the sensor can be used as a basic unit of the electronic skin and can be applied to fields of the stress-strain analysis and the like widely.

The present invention discloses an analysis and judgment method for the fatigue life of a fusion reactor divertor. According to the method, firstly, a complex load applied onto a divertor in a service environment is converted into a temperature and stress-time changing course. Secondly, a series of cycle counting sections during an irregular stress course are subjected to the rain-flow counting treatment. Thirdly, for each counting section, an elastic stress range thereof is obtained according to a numerical analysis result. Fourthly, based on a stress-strain analysis formula, the stress result of the finite element elasticity analysis is converted into the total cycle strain range of the above counting section. Fifthly, according to the cycle strain fatigue life curve of materials, different stress levels are subjected to the quantization of the fatigue damage. Sixthly, a fatigue damage value corresponding to each cycle of each counting section during the stress course can be obtained. According to the technical scheme of the invention, a given service environment is subjected to result evaluation. Therefore, related protective measures and maintenance recommendations are provided, or improvement opinions are provided for the design of the divertor. As a result, an obtained evaluation result is more objective and more real for engineering practices.

The invention provides a stress-strain digital data processing method for a reinforcing tunnel face of a broken and weak surrounding rock, which comprises the following steps: S100, establishing a three-dimensional model of a broken weak surrounding rock tunnel face according to project design, and carrying out virtual finite element segmentation to form a three-dimensional finite element model of the tunnel face; S200, in the section excavation process, detecting and storing basic data of the surrounding rock tunnel face; S300, performing stress-strain analysis on the tunnel face in combination with the basic data and the three-dimensional finite element model, and predicting the bonding repair demand strength of the surrounding rock tunnel face by adopting a preset algorithm; and S400, selecting a surrounding rock tunnel face reinforcement measure according to the bonding and repairing demand strength, and introducing the reinforcement measure into the three-dimensional finite element model for effectiveness analysis. The method can improve the analysis efficiency and effectiveness of the broken weak surrounding rock tunnel face reinforcement stress-strain data, improves the analysis precision, is used for guiding surrounding rock reinforcement, can guarantee the reinforcement effect, avoids the reinforcement failure, and controls the surrounding rock reinforcement cost.

A method for analyzing early deformation of nuclear reactor fuel based on a particle method, the main steps are as follows: 1. Establish a geometric model, set particle physical properties and mechanical parameters; 2. Establish a particle neighbor domain; 3. Calculate solid boundary particles based on boundary conditions and a solid collision model External force load; 4. Calculate temperature and calculate thermal expansion strain based on thermal expansion model; 5. Calculate plastic strain and elastic stress-strain of continuous medium particles in solid based on elastic model, elastic-plastic model and plastic model; 6. Determine whether fracture occurs and update particles 7. Output calculation results. This method can analyze the early deformation behavior of nuclear reactor fuel in severe accidents; based on the particle method, it can effectively avoid the grid distortion problem existing in the grid method; this method is a pure Lagrangian nuclear method, which can effectively avoid stress-strain analysis Tensile instability in the process.