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72 results about "Fatigue Intensity" patented technology
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High-reliability equal-strength design method and system for intelligent cubic press
The invention relates to the technical field of equal-strength design, and provides a high-reliability equal-strength design method and system for an intelligent cubic press, which considers structural characteristics of the cubic press, performs physical field analysis, modeling and simulation, determines deformation, temperature, stress distribution and stress concentration areas of key components, predicts structural crack initiation of the key components, and provides a high-reliability equal-strength design method and system for an intelligent cubic press. Crack propagation simulation is carried out; establishing a fatigue strength life prediction model based on deep learning and a simulation data set; constructing a fatigue strength reliability model, and establishing a mathematical association relationship among fatigue life, fatigue damage and reliability; a reliability calculation index is introduced into multi-objective optimization of the structure, a high-precision numerical solution of reliability robustness optimization design based on structure simulation is developed, and equal-strength design of the cubic press is achieved. According to the method, the optimal combination of design parameters can be obtained, the equal-strength design of parts and the whole machine structure is formed, and development of intelligent, high-precision and large-scale cubic press equipment is promoted.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY +3
High-cycle fatigue strength evaluation method based on damage influence
The invention provides a high-cycle fatigue strength evaluation method based on damage influence, and belongs to the technical field of aero-engines. The method comprises the following steps: performing a high-cycle fatigue test on a to-be-tested material to obtain first high-cycle fatigue strength, and performing a damage fracture test corresponding to a damage type to obtain a damage life, the damage type comprising creep damage and low-cycle damage; determining interruption time on the basis of the damage life, performing a damage fracture test on the basis of different interruption time, then performing a high-cycle fatigue strength test to obtain second high-cycle fatigue strength, and constructing a damage model; constructing a crystal plasticity constitutive model based on the damage model to perform simulation calculation on the to-be-tested material to obtain a simulation damage value; and correcting the first high-cycle fatigue strength based on the second high-cycle fatigue strength and the simulated damage value to obtain an evaluation result of the to-be-tested material. According to the method, deformation mechanisms of different damage types are clearly distinguished, the method is more flexible, interruption time setting refers to influences of different damage degrees, and the method is more accurate, safer and more reliable.
Owner:DONGFANG TURBINE CO LTD +1
Additive repair blade high-cycle fatigue limit prediction method based on random defect probability distribution
The invention provides an additive repair blade high-cycle fatigue limit prediction method based on random defect probability distribution, and relates to the field of aero-engine fan and compressor blade maintenance, and the method comprises the steps: obtaining the defect distribution of a real blade; establishing a prediction model based on a critical distance theory; according to the prediction model, critical distances of the multiple real blades are determined, and a first critical distance is generated; performing defect reconstruction based on the defect distribution of the real blade to generate a virtual blade; obtaining the first high-cycle fatigue strength of the virtual blade according to the defect distribution of the virtual blade, the first critical distance and the prediction model; respectively determining a plurality of defect parameters and a Pearson coefficient of the first high-cycle fatigue strength, and screening a first parameter significantly related to the first high-cycle fatigue strength; constructing a fatigue strength evaluation model; and inputting the first parameter into the trained fatigue strength evaluation model, and outputting the predicted high-cycle fatigue strength. According to the scheme, the high-cycle fatigue limit of the blade can be quickly predicted, and the prediction accuracy is improved.
Owner:AIR FORCE UNIV PLA +1
A low-cycle multi-axial fatigue life prediction method based on powder high-temperature alloy damage mechanism
PendingCN122154151ADesign optimisation/simulationComputational materials scienceFatigue damageFatigue Intensity
The present application relates to the technical field of high-temperature structural component fatigue strength design and life assessment, and particularly relates to a low-cycle multi-axial fatigue life prediction method based on powder high-temperature alloy damage mechanism. The method comprises: for the dangerous point of the component under non-isothermal multi-axial cyclic loading, calculating pure fatigue damage, pure creep damage and fatigue-creep interaction damage caused by a single load cycle; accumulating the pure fatigue damage, the pure creep damage and the fatigue-creep interaction damage to obtain the total damage of the single load cycle; taking the inverse of the total damage to predict the total failure life of the component under non-isothermal multi-axial cyclic loading. The method of the present application realizes effective prediction of the low-cycle multi-axial fatigue life of the powder high-temperature alloy component by accurately decomposing the damage of the dangerous point under non-isothermal multi-axial cyclic loading, can more truly reflect the comprehensive prediction model of the failure physics of the powder high-temperature alloy under multi-axial thermal mechanical loading, and improves the accuracy and reliability of the life assessment.
Owner:BEIJING UNIV OF TECH
Rehabilitation exercise device
The utility model relates to the technical field of spine surgery nursing, in particular to a rehabilitation exercise device which comprises a nursing bed, a shell, two round rods, a sliding plate, a rolling shaft, a plurality of rubber wheels, a stepping motor, a rotating frame, a connecting rod, a fixing column, two sets of buffering units, an auxiliary unit and a protection unit. A controller is clicked to start a stepping motor, so that the stepping motor drives a rotating frame to rotate, a connecting rod is used for pulling a fixing column to move leftwards, at the moment, a buffering unit pulls a rolling shaft to move, a rubber wheel rolls on the back of a patient, the rotating frame rotates in a shaft mode, a sliding plate is pulled to move back and forth on a round rod, and rehabilitation treatment is conducted on the patient through repeated operation. The auxiliary unit is used for supporting the patient to get on and off the nursing bed, so that the fatigue strength of workers is reduced, and the rehabilitation quality and efficiency can be effectively improved.
Owner:郭敬然
A new type of gas turbine turbine blade vibration fatigue test method
This invention provides a novel vibration fatigue testing method for gas turbine blades. Addressing the problems of large specimen wear, long testing time, and limited results associated with traditional step-and-step stress loading methods for obtaining blade fatigue limits, this invention excites blade resonance on an electromagnetic vibration table using novel step-and-step stress loading techniques on identical blade specimens. While retaining the step-and-step matching standard, when limited test data cannot meet the matching requirements, a stress "concession" method is rationally applied based on the turbine blade structure and fatigue strength level to eliminate test data with significant stress deviations, thereby obtaining the median fatigue strength of blades from the same batch. This invention makes stress matching faster and more flexible, requiring only 2-3 stress levels to achieve a test fitting result with a confidence level of over 95%, demonstrating high accuracy. This method is applicable to fatigue limit tests of all gas turbine blades.
Owner:NO 703 RES INST OF CHINA SHIPBUILDING IND CORP
A testing device integrating the test of the elasticity of the collecting piece and the fatigue strength test of the shuttlecock
ActiveCN119309795BMachine part testingApparatus for force/torque/work measurementFatigue IntensityClassical mechanics
The application discloses a testing device integrating the testing of the elasticity of a hair piece and the fatigue strength of a shuttlecock, and relates to the technical field of the fatigue strength testing of the shuttlecock. The testing device comprises a machine table, a guide rail horizontally arranged on the top surface of the machine table, a mounting seat fixed on the top surface of a sliding block, a pressure sensor fixed on the right end surface of the mounting seat, a mounting plate fixed on the right end surface of the pressure sensor, a force transmission rod fixed on the right end surface of the mounting plate, and a hitting block fixed on the right end of the force transmission rod. A tooling mechanism for fixing the hair piece and the shuttlecock is further arranged on the machine table. The application has the advantages that the elasticity of the hair piece can be tested, and the fatigue strength testing efficiency of the shuttlecock is improved.
Owner:CHENGDU DAYE INTELLIGENT MANUFACTURING TECHNOLOGY CO LTD
Method for testing fatigue strength of valve clack of copper valve based on intelligent sensor
InactiveCN121855862AMachine valve testingComplex mathematical operationsFatigue damageFatigue Intensity
The invention relates to the technical field of mechanical structure fatigue testing, and discloses a copper valve clack fatigue strength testing method based on an intelligent sensor. Pressure sensors are arranged at an inlet and an outlet of the valve, pressure in the whole opening and closing process is continuously collected to form an original time sequence, and pulsating pressure is obtained by subtracting the average pressure in the whole time period; an overlapping analysis window is constructed based on pulsating pressure, frequency energy of each window is solved by using a preset frequency mapping function and weighted to obtain a frequency spectrum gravity center and statistical characteristics of the frequency spectrum gravity center changing along with the window, and accordingly, a single-side fatigue damage index of each sensor is constructed and a most unfavorable measuring point is selected as an overall damage index. And combining the pulsating pressure root-mean-square value to obtain a fatigue strength evaluation value. Through the process, pressure fluctuation of the valve under all working conditions is reflected, static bias and noise influences are restrained, fatigue related frequency energy is highlighted, and online quantitative evaluation and early warning of the fatigue evolution degree of the valve clack are achieved.
Owner:SUPERY ABS PIPE FITTINGS CO LTD
A method for predicting fatigue strength of metal materials by hardness
ActiveCN116223264BMaterial strength using repeated/pulsating forcesInvestigating material hardnessFatigue IntensityMetallic materials
The present invention discloses a method for predicting the fatigue strength of metal materials by hardness, belonging to the field of materials science and engineering application technology. The method first establishes a fitting relationship between the hardness value and the fatigue strength coefficient and fatigue strength index based on data such as the material's hardness and fatigue curve, and then establishes a fatigue life prediction formula for the material based on the Basquin formula. The fatigue strength of the material can be obtained by substituting the number of cycles of fatigue test cycle stop (or the number of cycles of the S-N curve platform). This method effectively reduces the amount of experiments required to predict the fatigue strength of the material, greatly saving manpower and financial costs. It has the characteristics of simplicity, speed and accuracy, and can be widely applied to metal materials with different hardness obtained by hot working.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
A system fatigue reliability prediction method for large aviation planetary mechanism
ActiveCN115438543BDesign optimisation/simulationMulti-objective optimisationAviationFatigue Intensity
This invention discloses a system fatigue reliability prediction method for large aerospace planetary mechanisms. The steps are as follows: The fatigue load history of gear teeth under the coupled action of the system's global elastic behavior is calculated using the hierarchical finite element method to obtain load information; the probabilistic fatigue strength curve of the gear teeth is fitted based on gear low-cycle fatigue testing and the minimum order statistic conversion method; the load information and the probabilistic fatigue strength of the gear teeth are input into a reliability prediction model to obtain a system fatigue reliability prediction model that can consider the influence of system structural elements, establishing a mapping path from key structural elements of large aerospace planetary mechanisms to system reliability indicators. This invention leverages the stiffness potential of core structural elements to balance the contradiction between reliability and lightweight requirements in large aerospace planetary equipment; detailed tooth root stress calculations are not required in the system-level model; and a gear tooth probabilistic fatigue strength conversion method is proposed, thereby saving significant simulation and testing costs.
Owner:SHENYANG AEROSPACE UNIVERSITY
Clamping device suitable for tension-tension fatigue performance test of linear material and test method
The invention belongs to the field of fatigue strength testing of metal materials, and particularly relates to a clamping device suitable for tension-tension fatigue performance testing of a linear material and a testing method. A fatigue machine connecting piece is fixed to a fatigue machine, and the load is reset; the long-rod bolt, the springs and the sample upper clamp are assembled, so that the resultant force of the pre-pressure of the two springs is the amplitude of the fatigue load, and the pre-pressure of the springs is reserved; fixing two ends of the linear material by using a winding clamp, and loading to an average value of a fatigue load; mounting the assembled long-rod bolt, spring and sample upper clamp on the sample, and connecting with a fatigue machine connecting sheet; loading to the maximum value of the fatigue load; a sample lower clamp is hung on the sample; the distance between the linear material and the fatigue machine stand column is measured, a tensioner and a U-shaped bolt baffle assembly are installed, and it is ensured that the distance between the linear material and the fatigue machine stand column is not changed; and unloading until the wire rod is bent, clearing the load, and then starting a fatigue test. According to the invention, effective tension-tension fatigue test can be carried out on the linear material, and accurate wire fatigue performance data can be obtained.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Method for evaluating service life of gas turbine compressor blade based on high-cycle fatigue characteristics
PendingCN122021168ASubsonic/sonic/ultrasonic wave measurementDesign optimisation/simulationFatigue IntensityIndustrial gas
The invention provides a gas turbine compressor blade service life evaluation method based on high-cycle fatigue characteristics, and aims to solve the problem that fatigue tests under pure simulation and laboratory conditions cannot be effectively combined to meet the requirement of gas turbine blade type core component service life evaluation. According to the method, the strength condition and the vibration condition of the blade are determined through finite element analysis, then the stable attenuation law of the fatigue strength of the blade is obtained by actually measuring the vibration stress and the fatigue limit values of the blade in different use time periods, and the service life of the gas turbine compressor blade is comprehensively evaluated by taking the high-cycle vibration fatigue reserve as the standard. The method is not limited to a ship gas turbine compressor, is also suitable for effective evaluation of the service life of the moving blades of an industrial gas turbine and an aero-engine compressor, and can provide a fatigue reliability design direction for a new model.
Owner:NO 703 RES INST OF CHINA SHIPBUILDING IND CORP
Device for detecting fatigue strength of torsion bar springs of chassis of various vehicles
ActiveCN224189502UChange the detection axis distancereduce usageMachine part testingFatigue IntensityElectric control
The utility model discloses a device for detecting fatigue strength of torsion bar springs of chassis of various vehicles. The device structurally comprises an electrified positioning block, a parallel base, a protection plate, an electric control plate, a first detection body, a second detection body and a sliding rail, according to the utility model, the transverse slide rail is arranged on the parallel base as a basis, and the slide block at the lower end of the solid block of the second detection body slides in the slide rail, so that the distance between the detection rotating shaft in the convex block at the upper end of the solid block and the detection rotating shaft of the first detection body can be changed, and therefore, the torsion bar spring detection device can be matched with various torsion bar springs with different lengths; the torsion bar spring detection device can effectively adapt to torsion bar springs with different lengths for detection, a large number of driving parts can be saved for use through manual pushing of the control push block on the solid block, and the effects of saving cost and improving the practicability of the whole detection device can be achieved.
Owner:ZHEJIANG ISRI SHUANGDI SPRING
Fatigue-resistant structure of a vibration-damping axle
The utility model discloses a kind of anti-fatigue structures of shock-absorbing shaft, it is related to shock-absorbing shaft technical field, including inner shaft, outer sleeve and anti-fatigue component, the lower end and upper end of the inner shaft are respectively fixed with fixed lower plate, fixed upper plate, the outer side of the inner shaft is provided with anti-fatigue component, and anti-fatigue component includes bellow, shock-absorbing spring, spring washer and airbag layer, the outer side of the inner shaft is attached to bellow, and the outside of bellow is provided with shock-absorbing spring, and the upper and lower ends of shock-absorbing spring are both fixed with spring washer, the spring washer top end of upper side is fixedly connected with fixed upper plate, the spring washer bottom surface of lower side is installed with airbag layer, and the airbag layer is annular structure and located the outer side of inner shaft.The anti-fatigue structure of shock-absorbing shaft, bellow of inner shaft outer side can disperse acting force in the process of axial shock-absorbing, to improve the fatigue strength of inner shaft, and shock-absorbing spring cooperates airbag layer can buffer shock-absorbing, dispersion and absorption energy generated by road surface.
Owner:SHENZHEN FEIFAN HARDWARE ELECTRONICS CO LTD
Fatigue strength simulation method and device and readable storage medium
PendingCN121980695AGeometric CADDesign optimisation/simulationComputational scienceFatigue Intensity
The invention provides a fatigue strength simulation method and device and a readable storage medium. An electronic device establishes a finite element model for a planet carrier with the fatigue strength to be simulated, and the finite element model is used for outputting a finite element simulation file set of the planet carrier under the unit working condition. Then, the electronic equipment generates an input file set of simulation software according to the time sequence load file of the planet carrier and the finite element simulation file set; finally, the input file set is processed through simulation software to obtain a simulation result of the fatigue strength of the planet carrier, the automation degree is high, the accuracy is high, the fatigue strength simulation efficiency is improved to a great extent, and the labor cost is saved.
Owner:YUANJIAN WIND POWER JIANGYINENVISION ENERGY CO LTD
Method, device and storage medium for predicting fatigue strength of material
The application relates to the technical field of machine learning and intelligent manufacturing, in particular to a material fatigue strength prediction method, equipment and a storage medium. The method comprises the following steps: acquiring the load level of each sample of a measured material; determining a global smoothing parameter with a Gaussian kernel function as a reference based on the load level of each sample, and determining the smoothing parameter of each kernel function based on the global smoothing parameter; estimating the probability density function of the fatigue strength of the measured material based on each kernel function and the smoothing parameter of each kernel function; and calculating an expected value and a standard deviation based on the estimated probability density function, and taking the expected value and the standard deviation as the estimated value and the estimated standard deviation of the fatigue strength of the measured material respectively. The method of the application effectively improves the accuracy and reliability of the estimated average value and the estimated standard deviation of the fatigue strength.
Owner:SHENZHEN POWEROAK NEWENER CO LTD
Channel base
Owner:FUJI ELECTRIC CO LTD
Bayesian probability fatigue strength evaluation method for structural member with defects
The invention discloses a Bayesian probability fatigue strength evaluation method for a structural member with defects, and relates to the technical field of fatigue strength prediction of aerospace metal structural members. The method comprises the following steps: firstly, drawing a fatigue limit curve based on test data of a defective material sample, embedding a physical rule of an El Hadad curve through a synthetic data set, and establishing physical priori knowledge of a defect size and a fatigue strength behavior; training model parameters by using test data of the structural member, constructing a Bernoulli likelihood function, and matching an actual failure tag of the structural member; and finally, fusing the prior distribution and the likelihood function through the Bayesian theorem to obtain probability distribution after parameter updating, and outputting a predicted failure probability expected value and uncertainty. According to the method, material sample data containing defects are fused as physical prior based on the Bayesian theory, and the probability fatigue strength is evaluated through experimental data of a small amount of structural parts.
Owner:NANCHANG HANGKONG UNIVERSITY
Integrated testing device for fatigue strength and air tightness of gas meter shell
PendingCN120741165ADetection of fluid at leakage pointMaterial strength using tensile/compressive forcesFatigue IntensityWater immersion
The invention provides a fatigue strength and air tightness integrated testing device for a gas meter shell. The fatigue strength and air tightness integrated testing device comprises a fatigue strength testing device and an intelligent air tightness testing device. The fatigue resistance testing device is composed of a mounting group frame, a testing mounting station, a pressing mechanism, an air pressure control system, an elastic net bag and an image acquisition and analysis system, the elastic net bag is made of a high-elasticity material, precise grid marks are printed on the surface of the elastic net bag, and tiny deformation generated in the pressurizing process of the upper shell of the gas meter can be amplified and visualized; and accurate evaluation of the fatigue resistance is realized through deformation mode analysis. An innovative negative pressure water immersion method is adopted in the intelligent airtightness testing device, continuous testing of fatigue resistance and airtightness of the upper shell of the gas meter is achieved, and an intermediate transfer link is avoided; tiny deformation is amplified and visualized through the elastic net bag, so that the detection precision is improved; the method combining negative pressure water immersion and humidity detection is adopted, and automation is easier compared with a traditional bubble observation method.
Owner:ZHEJIANG JUHONG METERING SOLUTION CO LTD
Method and equipment for predicting fatigue strength of material and storage medium
The invention relates to the cross technical field of machine learning and intelligent manufacturing, in particular to a fatigue strength prediction method and equipment of a material and a storage medium. The method comprises the following steps: acquiring the load level of each sample of a tested material; determining a global smoothing parameter taking a Gaussian kernel function as a reference based on the load level of each sample, and determining a smoothing parameter of each kernel function based on the global smoothing parameter; estimating a probability density function of fatigue strength of the tested material based on each kernel function and the smoothing parameter of each kernel function; and calculating an expected value and a standard deviation based on the estimated probability density function, and respectively taking the expected value and the standard deviation as an estimated value and an estimated standard deviation of the fatigue strength of the tested material. According to the method, the accuracy and reliability of the fatigue strength estimation average value and the fatigue strength estimation standard deviation are effectively improved.
Owner:SHENZHEN POWEROAK NEWENER CO LTD
Fatigue strength analysis method based on opposite-pulling angle box R area
The invention discloses a fatigue strength analysis method based on an opposite-pulling angle box R area. Calculating the working stress sigma g of the dangerous section of the R area of the angle box under each working condition; calculating a detail fatigue rated value DFR of a key structure of the dangerous section of the R area; the maximum allowable working stress [sigma max] is converted from the value; and calculating the fatigue margin MS of the dangerous section position of the R area of the opposite-pulling angle box. According to the method, the structural detail fatigue margin estimation precision of the R region of the corner box is improved, and the reliability and credibility of structural safety life design are improved.
Owner:AVIC GENERAL HUANAN AIRCRAFT IND CO LTD
Method for predicting fatigue strength of maraging stainless steel based on short plate structure hardness
PendingCN121641280AChemical property predictionMaterial strength using repeated/pulsating forcesFatigue IntensityMetallic materials
The invention belongs to the field of fatigue strength evaluation of metal materials, and particularly relates to a method for predicting the fatigue strength of maraging stainless steel based on short plate structure hardness, which comprises the following steps: 1) determining a material fatigue cracking mechanism; (2) fatigue strength testing is carried out on the materials in various different heat treatment states, and the fatigue strength of the materials is obtained; (3) carrying out microhardness testing on the materials in various different heat treatment states to obtain hardness values of the materials; 4) fitting parameters of the fatigue strength prediction model according to the fatigue strength and the hardness value of the material, and establishing the fatigue strength prediction model; and 5) for the target heat treatment state material, performing fatigue strength prediction through the established fatigue strength prediction model. According to the method, the fatigue performance of the materials with the same component in different heat treatment states can be rapidly compared, only a small number of fatigue tests are needed for determining the fatigue cracking mechanism of the materials and testing the microhardness, and the progress of material selection, research and development and the like is effectively accelerated.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
Method for manufacturing metal plate structure
The method for manufacturing a metal plate structure according to the present invention is a method for manufacturing a structure using a metal plate by improving the fatigue strength of a portion at which fatigue damage is worried, the method comprising: a fatigue damage risk portion determination step (S1); a step for determining, as a fatigue failure risk site, a sheared end face of the metal plate which causes stress concentration and is worried about fatigue failure when the structure is used; and a compressive residual stress imparting step (S3) in which a load is applied to the metal plate or the structure such that the tensile plastic strain is concentrated on the fatigue failure risk site, and after the tensile plastic strain is generated in the fatigue failure risk site, the load is removed, thereby imparting compressive residual stress to the fatigue failure risk site.
Owner:JFE STEEL CORP
Fatigue strength analysis method based on opposite-pulling angle box stud
The invention discloses a fatigue strength analysis method based on opposite-pulling angle box studs. Calculating the working stress of the dangerous section of the stud of the opposite-pulling angle box under each working condition; calculating a detail fatigue rated value DFR of a key structure of the dangerous section of the stud; the maximum allowable working stress is converted through the DFR; and calculating the fatigue margin MS of the dangerous section of the stud of the opposite-pulling angle box, and when the fatigue margin MS is greater than 0, determining that the dangerous section of the stud meets the fatigue strength design requirement. According to the method, the DFR estimation precision of the corner box stud is improved, and the reliability and credibility of structural safe life design are improved.
Owner:AVIC GENERAL HUANAN AIRCRAFT IND CO LTD
Torsional fatigue strength testing device and method
Owner:WANXIANGQIANCHAO CO LTD
Proxy model establishment method for fatigue strength of steel
PendingCN121938490AChemical property predictionMolecular entity identificationFatigue IntensityData set
The invention relates to the technical field of alloy materials, and discloses a method for establishing a proxy model of fatigue strength of steel, which comprises the following steps: S1, carrying out uniaxial tensile test on an alloy material sample, and calculating to obtain Young modulus of the material; performing a fatigue test on the alloy material sample to obtain the fatigue strength of the material; combining the Young modulus, the fatigue strength and the chemical components and machining process parameters of the alloy material to form a data set; s2, performing cleaning and standardized data preprocessing operation on the data set; and S3, a random forest model is constructed, and the chemical components and the machining process parameters of the alloy material serve as characteristics. A random forest model and an artificial neural network model are constructed, a staged prediction method is adopted, the Young modulus is predicted through chemical components and processing technology parameters, then the Young modulus and the parameters are jointly used as features to predict fatigue strength, feature enhancement is achieved, more associated information is mined, and the fatigue strength is improved. Therefore, the prediction precision of the fatigue strength of the alloy material is improved.
Owner:ZHEJIANG JINDUN PRESSURE VESSEL
A fatigue strength checking method and system for a comprehensive test platform
The application discloses a kind of comprehensive test platform fatigue strength checking method and system, the method includes according to platform yield strength calculation checking result to determine the fatigue hot spot area to be analyzed;Through the Genie module of SESAM software, the fatigue hot spot area is refined to obtain refinement result;The statistical result of pre-set coastal wave dispersion diagram is selected to occur probability maximum three wave working conditions, and three kinds of calculation working conditions are designed according to the refinement result to obtain node stress calculation result;According to pre-set rule, node stress calculation result is processed, to predict the fatigue damage degree and fatigue life of fatigue hot spot area based on S-N curve fatigue analysis.The fatigue life evaluation of structure is provided.This process not only improves the accuracy of analysis, but also provides an important basis for subsequent design optimization and safety evaluation.
Owner:华能(临高)新能源有限公司 +2
Airplane stringer and skin circumferential connection detail fatigue rated value determination method
The invention discloses an airplane stringer and skin circumferential connection detail fatigue rated value determination method. The method comprises the following steps: S1, establishing a to-be-calculated common frame stringer and skin circumferential connection component finite element model; s2, applying a unit load, and analyzing the relationship between the extrusion stress of each component at the fastener and the gross area stress at the fastener in the model through a finite element; calculating a fatigue rated value of each detail part of each component according to a detail fatigue strength calculation method, and determining the most dangerous part of the connecting assembly; and S3, uniformly converting the fatigue rated values corresponding to all the components to a reference surface, and obtaining the fatigue rated values of all details of the common frame stringer and skin circumferential connecting assembly. According to the method, the situation that dangerous parts are missed to be checked due to subtle differences between structures or uniqueness of the structures is avoided, and the calculation result is more accurate.
Owner:AVIC GENERAL HUANAN AIRCRAFT IND CO LTD
Methods for simulation-based emission of operational load signals
The invention relates to a method for simulation-based emission of operating load signals to shorten fatigue strength tests, in particular for multi-channel loaded components, characterized by 1. Local stress calculation using the finite element method (FEM) and 2. Local fatigue damage calculation and identification of relevant reversal points, consisting of the following sub-steps: 2.1. Creation of a reference voltage-time curve, 2.2. Indexed Rainflow Counting and Classification, 2.3. Damage accumulation. 3. Reconstruction of the load-time profiles based on the relevant time points
Owner:IAM ING FUER ALLG MASCHINENTECHNIK MBH