160 results about "Strain rate" patented technology

The invention relates to the field of tunnel engineering geology and support design, and discloses a weak surrounding rock tunnel deformation risk discrimination method based on shear expansion-shear constitutive, which comprises the following steps: constructing a nonlinear coupling model between a shear expansion angle and shear stress, normal stress and joint parameters, and obtaining the shear expansion angle; establishing a volumetric strain rate discrimination formula; inverting an initial crustal stress tensor field; reconstructing an irregular tunnel boundary; constructing a risk level discrimination model, and outputting a risk level; supporting schemes such as supporting rigidity, anchor rod parameters and spraying layer thickness are matched according to the risk grades; establishing a model to predict a risk trend; a support adjustment suggestion is generated; collecting monitoring data to dynamically correct model parameters; and all the modules are integrated in a deployment system. According to the method, the coupling relation between the shear expansion angle and the shear strength is introduced, the coupling type constitutive discrimination model is established, the risk grading system and the support correction strategy associated with the support response are constructed, and active early warning of the high-risk section and dynamic adjustment of the support rigidity are achieved.

The invention discloses a scanning electrochemical microscope in-situ stress corrosion testing device and method, and belongs to the technical field of material stress corrosion testing, and the device comprises a base, a power transmission module, a clamping module, a corrosion module, a signal acquisition module and a scanning electrochemical microscope module. Slow strain rate stretching of a sample is achieved through a servo motor, a planetary gear speed reducer and a transmission mechanism, the clamping module is integrated with a force sensor to monitor loads in real time, the corrosion module provides a temperature-controllable corrosion environment, and the scanning electrochemical microscope module achieves electrochemical scanning of the surface of the sample. The device can synchronously obtain a load-deformation curve, corrosion morphology and microcell electrochemical information under stress-corrosion-temperature multi-field coupling, and provides an effective technical means for deeply researching a stress corrosion mechanism of a material. The method comprises the steps of sample installation, corrosion solution preparation, electrode arrangement, tensile test, electrochemical scanning and the like, and has the advantages of simplicity and convenience in operation, comprehensive data, high precision and the like.

The invention provides an impact deformation feature extraction method based on high-speed camera shooting and image processing, and the method comprises the steps: collecting the transient deformation data of the edge package of a remote controller housing under impact through high-speed camera shooting, recording the change speed of a strain rate, obtaining the material characteristics, the size of a package structure, and the geometric discontinuous features of an opening and closing part, generating continuous frame sequence images; performing strain field data quantification processing on the third visualization result, extracting strain field characteristic data, and judging influence weights of stress wave reflection on strain fields of different functional areas of the shell in combination with a falling height and an impact angle of the remote controller; and improving edge packaging design parameters according to the deformation buffer effect and discontinuous quantitative indexes at the opening and closing positions, verifying the improvement amplitude of the deformation buffer effect, and obtaining strain field distribution data of the optimized shell.

The invention belongs to the field of structural engineering, and particularly relates to a concrete compressive strength calculation method considering a strain rate effect and a size effect. The concrete compressive strength formula considering the size effect and the strain rate effect at the same time is deduced from the size effect formula and the strain rate effect formula of the concrete compressive strength. The formula comprises a constant term, a strain rate effect term, a size effect term and an interaction term. The constant item reflects the static strength of the concrete cubic test piece, the strain rate effect item reflects the strength improvement caused by strain rate increase, the size effect item reflects the strength reduction effect caused by test piece size increase, and the interaction item reflects the strain rate effect increase caused by the size increase and the size effect reduction caused by the strain rate increase. And finally, fitting all test data by adopting a multiple regression method to obtain various parameters of the concrete compressive strength. The formula fitting effect is good, the regression residual error is small, and the adaptability of the calculation method is verified.

The invention relates to the technical field of material mechanical property testing, and provides an ultralow-temperature slow strain mechanical tensile test platform which comprises a vacuum Dewar unit, a liquid helium temperature control unit, a slow strain tensile unit, a measuring unit and a control unit, the vacuum Dewar unit comprises a vacuum Dewar body and is used for providing a closed low-temperature test environment; the liquid helium temperature control unit comprises a direct injection module and a recovery module, the direct injection module is used for directly injecting liquid helium to the gauge length section of the sample for cooling, and the recovery module is used for recovering and recycling unevaporated liquid helium; the slow strain stretching unit is used for stretching a sample arranged in the vacuum Dewar body at a low strain rate; the measuring unit is arranged in the vacuum Dewar body and is used for monitoring the temperature, the force value and the strain data of the sample in real time. Liquid helium is used as a cold source, the liquid helium is directly aligned to the gauge length section of the sample through the direct injection module, and compared with a traditional liquid helium steam natural convection heat exchange mode, the heat exchange coefficient is increased, and automatic precise temperature control is achieved.

The invention discloses a material stress-strain constitutive relation modeling method and device, a program product and a medium, and relates to the technical field of metal material constitutive models. Uniaxial tensile experiment data of a metal material under the conditions of different temperatures and different strain rates is obtained and preprocessed, and a training data set reflecting mechanical behaviors of the material under the wide-range working condition can be constructed; constructing an initial neural network model comprising a main body network structure layer, a neuron unit, a connection parameter and a training mechanism based on the training data set, and performing iterative optimization on a hyper-parameter by adopting a Bayesian optimization algorithm to obtain a target neural network model; the nonlinear stress-strain relationship of the material under the conditions of different temperatures and strain rates can be accurately captured; the target neural network model is further converted into a user-defined material subprogram of the finite element analysis platform, and the subprogram can output a predicted material stress value according to the input strain, strain rate and temperature, so that seamless joint with a universal finite element analysis platform is realized, and the prediction precision of simulation is improved.

The invention provides a 50Cr5NiMoV alloy forging parameter optimization method, relates to the technical field of metal plastic forming, and quantitatively predicts the cracking risk by combining damage model simulation with blank geometric optimization. The method comprises the following steps: acquiring material mechanical parameters at different temperatures and strain rates through a thermal tensile test, and combining with Normalized Cockcroftamp; a damage model is established according to the damage criterion, the Latham damage criterion and the Zener-Hollomon parameters, and the material fracture risk is quantified. The damage evolution law of the conventional cylindrical blank and the thin kidney-shaped blank is analyzed through finite element simulation, and the blank shape and process parameters are optimized. Results show that the surface damage value of the thin kidney-shaped blank can be remarkably reduced under the conditions that the temperature is 1000-100 DEG C and the upsetting ratio is 2-2.1, the maximum damage value is reduced to 0.30 from 0.46, cracking is effectively inhibited, and therefore a scientific quantitative optimization basis is provided for the upsetting process.

The invention discloses an engine hood determination method and device and electronic equipment. The method comprises the following steps: acquiring a plurality of first target points on a first engine hood model, and performing head collision simulation on the plurality of first target points to obtain strain rate ranges corresponding to the plurality of first target points respectively; determining a plurality of target strain rates according to the strain rate ranges corresponding to the plurality of first target points; material parameters corresponding to the multiple candidate aluminum alloy materials are determined according to the multiple target strain rates; the first engine hood model is adjusted according to the multiple candidate aluminum alloy materials and the corresponding material parameters with the minimization of the head damage index as the target, a target engine hood model is obtained, and the strain rate sensitivity coefficient of the candidate aluminum alloy materials used by an inner plate in the target engine hood model is a negative value. The technical problem that in the prior art, an engine hood is designed based on the material performance of a single strain rate, and the head injury index is high in pedestrian head collision is solved.

The invention discloses a simulation method, device and equipment for a composite material automobile ceiling, and the method comprises the steps: firstly obtaining material samples of different layers, such as a PU foam layer, a non-woven fabric and glass fiber composite material layer, a sponge layer and a fabric layer, on a target automobile ceiling; acquiring at least one material parameter of elastic modulus, Poisson's ratio and stress-strain curve of the material samples at different temperatures and different strain rates; and then an integral sample piece of the target vehicle ceiling is obtained, material testing and simulation benchmarking are carried out on the integral sample piece to verify whether the obtained material parameters are accurate or not, and if yes, simulation modeling is carried out on the target vehicle ceiling by using the material parameters to obtain a simulation modeling result. Therefore, simulation modeling can be carried out on the target vehicle ceiling by layering the composite material, the influence of various materials with different physical attributes on the mechanical property of the ceiling is fully considered, and the simulation modeling precision and the modeling effect are effectively improved.

The embodiment of the invention discloses a simulation calculation method and device for a thin shell transient jump behavior, a medium and equipment. The method comprises the steps that a thin shell finite element analysis model is established; performing time sequence simulation analysis on the transient jump behavior of the thin shell, and in each time step, calculating a strain change rate characteristic value spectrum, and obtaining a nonlinear strength index and a local stiffness spectrum radius of each unit; when the non-linear criterion index of the unit is greater than a threshold value and the local stiffness spectrum radius is greater than the threshold value, dividing the unit into an explicit domain unit and improving the calculation precision by adopting a sub-step size control technology, otherwise, dividing the unit into an implicit domain unit; a self-adaptive step length technology is adopted, and the calculation efficiency is improved through large-step-length propulsion; calculating an incremental potential energy function, and judging whether the thin shell is about to enter a deformation bifurcation point or not by adopting a stability criterion; and constructing a deformation tentative displacement vector by adopting the fastest descending direction of the potential energy function, and accurately capturing real physical paths of jumping behaviors under various working conditions.

The invention relates to a metal material strain rate effect measurement method based on multiple stress relaxation, which comprises the following steps: carrying out a standard quasi-static stretching or compression test on a material sample at a constant strain rate to obtain a stress-strain curve; analyzing a strain range according to a stress-strain curve, and determining a stress relaxation frequency N to be developed and a corresponding relaxation strain value sequence epsilon i, i = 1... N; a material sample is taken to be subjected to a tensile or compression test at a set strain rate, stress relaxation lasts for relaxation time delta t when the strain sequentially reaches values in each relaxation strain value sequence, and after each stress relaxation, the tensile or compression test is performed according to the set strain rate; obtaining a stress-plastic strain rate curve corresponding to each relaxation strain epsilon i; and obtaining a stress-strain curve corresponding to each strain rate. Stress-strain curves corresponding to different plastic strain rates in a quasi-static range can be obtained through a single sample.

The application discloses a finite element simulation method suitable for multi-step electromagnetic forming effect evaluation and a related device, relates to the technical field of metal plate electromagnetic incremental forming and finite element simulation, and the method comprises the following steps: constructing an initial constitutive model of a to-be-formed plate based on a first uniaxial tensile test; performing finite element simulation on a multi-step electromagnetic forming process of the to-be-formed plate, and recording stress and strain distribution and strain rate distribution of a deformation area; performing a second uniaxial tensile test at each stage of the multi-step electromagnetic forming process according to the strain rate distribution, and integrating hardening models at all stages into a constitutive model for characterizing material whole-process forming; based on the constitutive model, re-performing multi-step electromagnetic forming finite element simulation, outputting forming effect evaluation parameters at each stage, and adjusting process parameters according to the forming effect evaluation parameters. The application can improve the accuracy of forming effect evaluation.

The invention provides a method for constructing a bearing test distortion model of an ice-resistant structure under the action of a dynamic ice load, and belongs to the field of test similar reduced scale model design under an ice breaking load of the ice-resistant structure. The problem that in the prior art, the strain rate of a fully-similar model is dissimilar due to the scale effect is solved; a traditional distortion model design method has the problem of dissimilar energy distribution. The method comprises the following steps: establishing a fully similar model from an ice-resistant structure prototype to a geometric and plate thickness equal ratio reduced scale; establishing a plate thickness distortion reduced scale model by using the same material on the basis of the geometric similar reduced scale model; preliminarily determining a collision contact position of the thickness distortion reduced scale model; a dynamic ice load similarity criterion is applied, correction factors are deduced through dimensional analysis, and ice body parameters and collision speed of a distortion model system are adjusted, so that the ice breaking capacity and dynamic structure response are similar to those of a prototype system. The device is mainly used in the field of polar region icebreaking.

The invention discloses a thermal deformation control method for hot gas bulging forming of ultrahigh-strength steel. According to the method, the temperatures of a fillet area and a central area of a mold are controlled to be lower than the temperature of a non-deformation supporting area in the axial material supplementing and radial forming stage; bulging is conducted through a dynamic air pressure curve, the strain rate is inversely calculated in real time based on the wall thickness measured through laser, and the strain rate is stabilized within the critical range through closed-loop feedback; meanwhile, the temperature of the pipe blank is monitored in real time through a thermal infrared imager and compared with a target value, and the deviation is controlled within + / -5 DEG C by adjusting a mold temperature control unit; according to the method, the dynamic air pressure curve is introduced and is cooperatively controlled with the strain rate in real time, so that the deformation rate of the material in the whole bulging process is always stabilized in the optimal critical plasticity interval, the deformation capacity of the ultrahigh-strength steel at the high temperature can be fully exerted, the uniformity of wall thickness distribution of a component can be greatly improved, and the deformation rate of the ultrahigh-strength steel at the high temperature can be improved. And local excessive thinning or fracture caused by out-of-control strain rate is avoided.

The invention relates to the technical field of combined machining, in particular to a special-shaped ring rolling process method for tooth blank die forging forming, which comprises the following steps: circularly adjusting the rotating speed of a main roller and the feeding speed of a core roller of a ring rolling device in real time according to the actual rotating angle of an annular blank, and correcting the eccentric degree of the annular blank; reflecting the matching condition of the radial strain rate and the axial strain rate according to the change of the convex part of the annular blank, adjusting a correction parameter for correcting the eccentricity degree of the annular blank, and adjusting the holding roller compression rate of the rolling ring device to make up the change of the length of the convex part; estimating the required torque of the main roller and the maximum static friction, and judging whether the eccentricity of the corrected annular blank can cause the required torque of the main roller to exceed the limit or not; when the required torque of the main roller exceeds the limit, the adjusting amplitude of the rotating speed of the main roller and the feeding speed of the core roller is reduced, and the judgment standard for judging whether the eccentricity degree of the annular blank can be corrected or not is called back. The forming uniformity of the non-standard annular special-shaped tooth blank is improved by combining die forging with ring rolling.

During material testing, the user can determine whether the shape of the output waveform is appropriate. [Solution] The fatigue testing machine 1 is a fatigue testing machine that performs a fatigue test to measure the mechanical properties of a test piece TP by applying a test force F to the test piece TP, and comprises a hydraulic actuator 18 that applies a test force F to the test piece TP, a generation unit 511 that generates a sinusoidal input waveform W1 that is a target value of the test force F, a detection unit 513 that detects the test force F applied by the hydraulic actuator 18 to the test piece TP, and a calculation unit 514 that calculates the strain rate HD of the output waveform W2 that is the detection result of the detection unit 513 while the fatigue test is being performed.

Method for monitoring the structural health of a nickel-based superalloy part, comprising the steps of: estimating (S101) a local strain distribution ε, temperature T, and strain rate within the part; estimating (S102) a local dislocation density ρ within the part based on the local strain distribution ε, temperature T, and strain rate; and determining (S103) the local presence of a structural anomaly when the local dislocation density ρ is outside a predetermined range of values. Fig. 1.

The present application relates to the technical field of material dynamic mechanical property testing, and discloses a self-adaptive Hopkinson bar experimental parameter real-time regulation method and system, which comprises the following steps: obtaining incident wave signals, reflected wave signals and transmitted wave signals; denoising the incident wave signals to obtain denoised waveforms; loading the denoised waveforms into a finite element model to perform transient dynamics calculation to obtain a simulated response set, and combining a dispersion equation model analysis to obtain a geometric dispersion delay spectrum; reconstructing a simulated distorted waveform from the geometric dispersion delay spectrum and calculating a constitutive matrix; loading the constitutive matrix into the finite element model to obtain a time-domain response sequence, combining a regression model prediction to obtain a comprehensive distortion prediction, and predicting a preliminary compensation amount through a neural network model; calculating an initial strain rate, correcting the preliminary compensation amount to obtain a corrected compensation amount, using the corrected compensation amount to perform distortion compensation, calculating a feedback strain rate, combining a constant strain rate to verify a strain rate deviation, and realizing a constant sample strain rate. The present method can realize constant sample strain rate.

The application provides a key type near field dynamics based concrete rate effect constitutive modeling method, comprising: establishing a simulation model of concrete under impact, including an impact object and a concrete structure; modeling the simulation model, determining coordinates of all material points, completing group binding, and performing surface correction; calculating a dynamic enhancement coefficient of the key according to a deformation rate of the key and a concrete strength; calculating a dynamic limit deformation rate of the key according to the dynamic enhancement coefficient of the key; calculating a dynamic force function constitutive model of the key according to the limit deformation rate of the key; obtaining a dynamic damage judgment formula of the key according to the limit deformation rate of the key; calculating the stress and motion of the material point, and completing time circulation; outputting the calculation result and completing visualization of the result. The application reconstructs the limit elongation rate, the force function constitutive and the damage calculation of the key by introducing the dynamic enhancement coefficient, can reasonably restore the strain rate effect of the concrete material, restore the damage process of the concrete under the impact load, and ensure the calculation efficiency of the model.

A method for steady-state control of cutting state, implemented based on computer numerical control (CNC) machine tools or cutting lathes. The method comprises: fitting parameters of a stored energy evolution model of a workpiece material to be machined; discretizing primary shear zone into multiple infinitesimals along normal direction of main shear plane; introducing equivalent cutting edge model, inputting pre-used cutting parameters, calculating strain and strain rate of each infinitesimal and analyzing temperature of each infinitesimal; deducing and solving differential equation of each infinitesimal of stored energy to position of the primary shear zone by taking initial shear plane of the primary shear zone as model boundary; determining application values of cutting parameters according to solved results; and, controlling and adjusting the cutting tool in the actual cutting process to cut the workpiece material to be machined with the application values.

The invention discloses a method for analyzing the influence of ultra-high performance concrete components on dynamic compressive strength, particularly relates to the field of dynamic performance analysis of building materials, and is used for solving the technical problem of concrete dynamic strength discretization caused by industrial solid waste fluctuation. The method comprises the following steps: acquiring industrial solid waste raw material particle size distribution data and impurity content data, and combining dynamic impact strength sequence analysis; after invalid data is removed, quantitative mapping of coarse particle components and stress wave transmission efficiency is established; calibrating the pore characteristics based on the impurity content, tracking the impurity migration trajectory when the connected pores exceed the standard, and calculating the collaboration degree of the impurity migration trajectory and the strain rate change; and finally, outputting a dynamic compressive strength standard deviation through a multi-factor linear regression model. Accurate prediction of dynamic performance under solid waste fluctuation is realized, and an anti-discrete design basis is provided for a maritime work anti-seismic structure.

The invention relates to a metal material fire-strain rate whole-process coupling dynamic mechanical property testing device which comprises a high-speed testing machine, a heating system and a whole-field strain monitoring module, and the whole-field strain monitoring module comprises a camera system and a control system. The upper clamp and the lower clamp are respectively provided with a vertical clamping face and a bar groove, universal clamping of plates and bars can be achieved respectively, operation is simple, and burdens of operators are reduced. The dynamic stretching of the metal material can be realized, the dynamic compression of the metal material can also be realized, and the application range of the test device is widened. A DIC system is adopted, full-field strain monitoring under the high temperature-strain rate full-process coupling condition is accurately achieved through the three-dimensional DIC digital image testing technology, and the problems that a traditional high-temperature extensometer is tedious in use and operation, inaccurate in testing and the like are solved. The heating furnace and the heating assembly and the temperature control assembly of the heating furnace can effectively achieve real-time temperature change in the heating furnace, and fire scene simulation of the whole heating-cooling-cooling process of metal materials is achieved.

The present application belongs to the technical field of engineering materials, structural deformation and mechanical experiments, and particularly relates to a medium strain rate high temperature tensile test device and method. The medium strain rate high temperature tensile test device of the present application can meet the tensile test requirements of materials in a medium strain rate range under a high temperature environment. The upper pull head of the test piece is designed as an arc-shaped flange structure, and is connected to the loading beam using a pin. In this way, the upper pull head of the test piece with an arc-shaped flange is always in a vertical posture under the action of gravity, ensuring the coaxiality of the test piece when it is connected to the upper pull head of the test piece and the lower pull rod of the test piece. Two sets of high temperature heating modules are designed, with the maximum heating temperatures of 800°C and 1400°C respectively. The support frame of the high temperature heating module is designed as an upper and lower adjustable height bracket, which can meet the heating requirements of different test pieces and different fixtures during the test process, thereby improving the operability of the experimental process.

The invention belongs to the technical field of rail traffic, and particularly discloses an efficient calculation method for the strain rate of a steel rail material under wheel-rail rolling contact, and the method comprises the steps: building a three-dimensional wheel-rail rolling contact model considering a dynamic stress effect, and precisely solving a wheel-rail contact local solution under dynamic stress fluctuation; an efficient steel rail stress-strain calculation model is established and embedded into dynamics, a steel rail internal stress-strain field is solved in real time, and the limitation that a traditional multi-body dynamics model only considers a contact interface and cannot calculate steel rail dynamic deformation is broken through; the method for determining the grid size and the integral step size in strain rate calculation is provided, high-frequency numerical fluctuation occurring during dynamic calculation is eliminated, calculation efficiency is improved while calculation precision is guaranteed, and the method is suitable for being embedded into vehicle-track coupling dynamics for rapid real-time calculation.

This method for producing a crystalline resin sheet includes press-rolling a sheet-shaped molten crystalline resin composition between a pair of pinch rolls. The crystalline resin composition includes a crystalline resin and a soluble nucleating agent. When the radius of the pair of pinch rolls is denoted by R, the average thickness of the sheet after press-rolling is denoted by L, and the sheet take-up speed in the pair of pinch rolls is denoted by V, an adjustment is performed so as to control the average elongational strain rate ε (R, L, V) in the sheet elongation direction represented by a specific formula to be more than 30 s−1 but no more than 80 s−1.

The application relates to a high-temperature alloy cross-piercing process interlayer defect prediction method and model, and particularly relates to a high-temperature alloy cross-piercing process interlayer defect prediction method and model, which comprises the following steps: establishing a high-temperature alloy cross-piercing finite element model, and performing high-temperature alloy cross-piercing finite element simulation; extracting all data of equivalent strain, temperature, strain rate, maximum shear strain, stress triaxiality, maximum shear stress, equivalent stress and maximum shear strain at the moment of deformation termination in the whole deformation process; calculating integral to determine damage value, average temperature and average strain rate; and performing high-temperature alloy compression-shear deformation experiments under the average temperature and average strain rate determined in the previous step. The application can predict engineering fracture problems in an actual deformation process through simple compression-shear hot simulation deformation experiments and finite element simulation technology, reduces the trial-and-error process in the actual production process, and saves manpower, material resources and financial resources.

Provided is a technique that can contribute to suppressing the amount of data required for formulating the strain rate dependence of the yield point and facilitating the desired analysis to be easily performed. 【Solution means】In a molded body formed by molding a metal material to be analyzed, a strength test is performed in which a load is applied and deformed at three different load rates, so that the strain rate ε when deformed · 1, ε · 2, ε · 3 and the yield point σ y,1 , σ y,2 , σ y,3 are measured. Then, in the relational expression of the strain rate ε dependence of the yield point σ of the metal material formulated using three material parameters A, B, and C based on the thermoactivation process theory, (σ y ε · ) = (σ y, ε · ) = (σ y,1 , ε · 1)(σ y,2 , ε · 2)(σ y,3 , ε · 3) is assumed to hold, and the three material parameters A, B, and C are derived by calculating the simultaneous equations of the three material parameters A, B, and C.

This invention relates to the field of structural engineering testing and discloses a method for the coordinated acquisition and fusion of deflection and strain in static load tests of structural components. The method includes: monitoring local strain physical quantities and calculating real-time strain rate; identifying the strain mutation initiation signal when the strain rate exceeds a threshold; retrieving the relative physical span between sensing nodes and the intrinsic stress wave velocity of the material; calculating the physical lag time; sending a hardware interrupt pulse carrying a time delay parameter to the deflection sensing node; driving the hardware circuit to activate a timing response matching the physical lag time; and capturing the macroscopic deflection physical quantity at the end of the timing. This invention eliminates the perception phase misalignment caused by spatial span by constructing a hardware sampling alignment mechanism driven by physical causality, ensuring that the acquired data conforms to the structural mechanics constitutive relationship, and improving the system's accuracy in identifying structural damage evolution characteristics.

According to the method, an improved Johnson-Cook constitutive model subprogram is achieved in a finite element software implicit algorithm material library, compared with a traditional Johnson-Cook constitutive model, the improved Johnson-Cook constitutive model corrects a plastic deformation term and a strain rate term, and the improved Johnson-Cook constitutive model can more accurately describe the abrasion behavior of the power transmission line hardware under impact loads such as instantaneous strong wind. The improved Johnson-Cook constitutive model is embedded, developed and improved in an implicit algorithm material library, the implicit algorithm can more accurately achieve constitutive integration of the material compared with an explicit algorithm, the method can more accurately describe the stress-strain relation of the fitting material under different strain rates, and the precision of transmission line fitting abrasion simulation is improved.

This invention discloses a method and system for determining the temperature / strain rate dependence of metal strength, belonging to the field of micro-nano technology. The method obtains the compression or tension stress-strain curves of micro-nano metal samples, as well as the background noise of the no-load test. Based on the background noise, the maximum displacement rate of the micro-nano mechanical testing instrument is determined and used as a threshold. Based on the threshold, the stress-strain curves are iterated to determine the start and end points of all dislocation avalanches, the total plastic displacement of the dislocation avalanches, and the intensity ratio of the micro-nano metal sample, thereby determining the temperature / strain rate dependence of the metal strength. This method, through testing a single sample at room temperature and calculating the intensity ratio, can quantitatively and accurately confirm whether the strength is temperature-dependent, thus avoiding the limitations of qualitative analysis and the need for multiple multi-sample experiments to save time, manpower, and other experimental costs.