248 results about "Afm indentation" patented technology

A method of performing indentation plastometry is provided. The method includes steps of: providing a sample of a material and an indenter having a contact surface of a predetermined shape and size; forming a first indent having a first penetration depth within the sample by applying a load to press the contact surface of the indenter into the sample; measuring a first indent profile of the first indent; on the basis of the first indent profile, and the applied load to form the first indent, obtaining a preliminary measurement of a characteristic of the material; on the basis of the obtained preliminary measurement of the characteristic of the material, determining whether a second indent having a different, second penetration depth is required to obtain a more accurate measurement of the characteristic of the material, and when the second indent is required, determining a value for the second penetration depth; forming the second indent having the second penetration depth within the sample by applying a load to press the contact surface of the indenter into the sample; measuring a second indent profile of the second indent; and on the basis of the second indent profile, the applied load to form the second indent, obtaining the more accurate measurement of the characteristic of the material.

A collaborative inversion method for mechanical property parameters of a plating layer and an alloy layer of a pre-plated metal plate comprises the following steps: after a nanoindentation experiment is implemented on the surface of the plating layer of the metal plate to obtain indentation three-dimensional contour data, generating a load-displacement curve and indentation morphology data under each parameter combination through three-dimensional simulation as a training set; and learning a nonlinear mapping relationship between the multi-dimensional features and the mechanical property parameters of the material by using a neural network, and then determining the mechanical property parameters of the microcell of the multi-layer structure through inversion calculation. According to the method, through multi-layer structure micro-area mechanical property inversion, the inversion precision of mechanical property parameters of the plating layer and the alloy layer can be improved, the problem of brother materials is effectively relieved, meanwhile, the calculation efficiency can be guaranteed, and a reliable solution is provided for mechanical property characterization of a multi-layer structure material.

The invention relates to the technical field of material mechanical property testing, and discloses a material indentation and scratch testing device and method under a composite energy field, and the device comprises a supporting experiment table, a vertical micro-motion platform, a horizontal micro-motion platform, a high-definition optical microscope, a force sensor, a displacement sensor and an additional energy field generation system. According to the method, a controllable additional energy field is synchronously applied while a mechanical indentation or scratch load is applied to a hard and brittle material sample, and load displacement data is collected in real time. In the data processing stage, the real hardness is calculated by adopting a corrected proportion sample resistance model, the elastic modulus is calculated based on the Oliver-Pharr theory, and the fracture toughness of the material is analyzed and calculated according to the size of the indentation tip crack. The problem that in-situ mechanical property characterization cannot be carried out in a composite energy field in a traditional test is solved, the hardness calculation precision is improved, the fracture toughness measurement function is expanded, and the experimental device and method are provided for research of a hard and brittle material composite machining mechanism.

The present invention discloses a material mechanical parameter identification method based on interval optimization and indentation testing, which specifically comprises the following steps: Step 1: performing multiple Berkovich indentation tests on the metal material to be tested, obtaining load and displacement curves of multiple loading processes of the nanoindentation test of the tested material, and obtaining the upper and lower limits of the loading curvature C; Step 2: establishing a design space for the material plasticity parameters, and establishing a simulated indentation displacement snapshot matrix X. sim Step 3: Establish an artificial neural network including an input layer, two hidden layers, and an output layer connected in sequence, and optimize the hyperparameters of the established artificial neural network; Step 4: Establish an uncertain optimization problem; Step 5: Based on the interval optimization and interval order relationship of the minimization problem, the uncertain optimization is converted into a deterministic optimization, and a two-layer genetic algorithm nested solution method is used to solve the uncertain optimization problem. The method of the present invention reduces the cost of parameter identification calculation and improves the efficiency of numerical calculation.

The invention discloses a method for testing heat treatment residual stress of a bearing ring based on nanoindentation, and belongs to the technical field of stress testing. The method comprises the following steps: establishing a calibration curve, preparing and testing a sample, and calculating residual stress. According to the method, the indentation work-residual stress quantitative calibration curve for the bearing steel is established through finite element simulation, the specific constitutive relation of materials is fully considered in the model, and system errors caused by mismatching of material parameters of a general model are eliminated. The change trend of the residual stress value calculated by the method is consistent with that of a prediction result of finite element analysis, and it is proved that the method can accurately, reliably and quantitatively characterize the residual stress distributed in the microscale after heat treatment.

The invention belongs to the technical field of metal material science, and particularly relates to an alloy fracture toughness analysis method and system based on a nanoindentation technology, and the method comprises the following steps: S1, carrying out nanoindentation continuous rigidity test on an alloy sample by adopting a Berkovich indenter to obtain an indentation load-indentation depth curve; performing a tensile property test on the alloy sample to obtain the elongation at break and the intrinsic elastic modulus of the material; s2, linear fitting parameters are determined according to the logarithmic linear relation between the effective elastic modulus and the indentation depth; s3, calculating a critical effective elastic modulus according to a continuous damage mechanics theory; S4, calculating the critical indentation energy of the unit contact area of the target alloy through a P-h curve; and S5, calculating a fracture toughness index according to continuum mechanics and a Griffith fracture theory. The method solves the problems of low efficiency and macro-micro data disjunction of a traditional method, and provides a systematic solution for fracture toughness analysis of plastic materials including but not limited to plastic metals such as zinc alloy, aluminum alloy, magnesium alloy and the like.

To perform an alloy composition search that enables automatic, high-speed evaluation between evaluation devices for a plurality of evaluation items, this automatic evaluation device (1000) is provided with: a nanoindentation testing machine (50) which measures a mechanical characteristic according to the shape of an indenter mark; a mechanical characteristic distribution memory unit (120) which stores a distribution condition of the mechanical characteristic; a measurement instrument cooperation controller (110) which controls measurement work by measurement instruments upon a sample to be measured; a measurement data storage unit (130) which stores measurement data from the measurement instruments; and a post processing unit (200) which calculates physical property data corresponding to the measurement data.

The invention provides a Kovar alloy nano-indentation and nano-friction simulation method based on molecular dynamics. The technical key points are as follows: carrying out initial setting on a simulation system and establishing a model; defining a potential function; performing model initialization, including energy minimization, temperature initialization and system relaxation; performing nanoindentation simulation and extracting data; performing nanometer friction simulation and extracting data; and processing and analyzing simulated data, namely outputting a depth-load curve, calculating hardness, fitting and calculating an elastic modulus, calculating a friction force and a friction coefficient, and analyzing wear morphology and dislocation evolution in the alloy through a simulation process file. By analyzing the mechanical properties and the frictional wear properties of the Kovar alloy at different environment temperatures, stable and reliable simulation data is obtained, the actual experiment cost is greatly reduced, and technical guidance is provided for application of the Kovar alloy in the field of vacuum sealing elements.

The invention provides a material constitutive parameter inversion method which can be applied to the technical field of artificial intelligence. The material constitutive parameter inversion method comprises the following steps: acquiring an elastic modulus and an actually measured load depth curve of a to-be-tested material in a single nanoindentation test; performing extrapolation translation preprocessing on the actually measured load depth curve to obtain an equivalent ideal curve; carrying out characterization processing on the equivalent ideal curve to extract input characteristic parameters which comprise press-in rigidity, unloading rigidity and plastic work proportion; the indentation rigidity, the unloading rigidity, the plastic work ratio and the elastic modulus are input into a pre-trained indentation constitutive mapping model to predict the yield strength and the strain hardening index of the to-be-tested material, and the indentation constitutive mapping model is a full-connection back-propagation neural network pre-trained through a finite element virtual test sample. The invention further provides a material constitutive parameter inversion system and device, a storage medium and a program product.

The invention discloses a method for generating a micromechanical property distribution diagram of a solid waste composite cement-based cementing material, and belongs to the technical field of performance prediction of solid waste composite cement-based cementing materials, and the method comprises the following steps: acquiring BSE, EDS and nanoindentation data of a sample; identifying indentation areas in the nanoindentation mark graph, and generating masks corresponding to the areas; performing statistics on the regional masks to obtain element content data of each indentation region; establishing a prediction model by adopting machine learning based on the regional element content and the elasticity data; performing super-pixel segmentation on the BSE image to match the scale of the indentation area; calculating element features of the super-pixel regions, and predicting the elastic modulus of each super-pixel region; and mapping the predicted elastic modulus to a corresponding region to generate an elastic modulus distribution diagram. According to the method, prediction of the two-dimensional space distribution of the internal elastic modulus of the solid waste composite cement-based cementing material can be realized, and data and visual support are provided for material heterogeneity research and multi-scale modeling.

The invention relates to the technical field of metal powder metallurgy process simulation. The high-entropy alloy hot pressing sintering and nanoindentation coupled molecular dynamics simulation method comprises the steps that a three-dimensional multi-particle atomic model of a high-entropy alloy is built, and initial boundary conditions are set; adjusting an initial boundary condition to be a contractility boundary condition, setting process parameters of hot pressing sintering on the model, and executing molecular dynamics simulation of the hot pressing sintering process; performing molecular dynamics and Monte Carlo hybrid simulation on the sintered model; mechanical boundary conditions are set for the optimized atomic model, a virtual indenter is controlled to be pressed into the optimized atomic model, molecular dynamics simulation of a nanoindentation test is executed, and physical field response parameters are collected in the test process; and based on the physical field response parameters, macroscopic mechanical property indexes are extracted. According to the method, the mapping relation between the hot pressing sintering process parameters and the macroscopic mechanical property is established, and a basis is provided for optimization of the hot pressing sintering process of the high-entropy alloy powder.

The invention relates to the technical field of wide bandgap semiconductor materials, in particular to a rapid detection method for a fatal defect of a gallium oxide epitaxial wafer. The method comprises the following steps: S1, preparing a gallium oxide epitaxial wafer; s2, performing a nanoindentation test on the surface of the epitaxial wafer to obtain a local mechanical property data load-displacement curve and an electrical response data current-time curve; s3, based on correlation analysis of the mechanical property data and the electrical response data, positioning and classifying fatal defects in the epitaxial wafer; the fatal defects comprise dislocation and cracks, and are judged by the following modes: an area in which the elastic modulus is reduced by more than 10% and the current is suddenly increased is a dislocation enrichment area; the area where the load-displacement curve has the onrushing phenomenon is a crack defect. The method is based on the nanoindentation technology, rapid positioning and classification of defects are achieved through mechanical-electrical coupling response, the limitation of a traditional method is broken through, and core technical support is provided for quality control and process upgrading of the gallium oxide epitaxial wafer.

The invention discloses a roll shaft adjusting device of a stable-tension laminator and a real-time roll material tension monitoring method, and relates to the technical field of roll shaft adjusting devices. The roll shaft adjusting device comprises two guide plates vertically arranged on the ground; through mutual cooperation of the extrusion roller and the pressure sensor, pressure data between the roller shaft and a film material can be conveniently obtained at any time, and the accuracy of film pasting tension detection is improved; a first electric telescopic rod is matched with a lifting plate, so that the tension can be dynamically adjusted in real time according to the film material characteristics and the film pasting speed, and the efficiency of film tension adjustment is improved; the adjusting sensitivity of the fixing plate is analyzed through the analysis module, and a corresponding signal is generated to enable the execution module to control the adjusting push rod to change the friction force between the rubber pad and the connecting rod, so that stepless adjustment of the moving sensitivity of the fixing plate is realized, and tensile deformation or light transmittance degradation of a membrane material caused by adjustment lag is avoided; and indentations or wrinkles on the surface of the membrane material caused by excessive mechanical response are avoided.

The invention relates to a nanoindentation and reliability characterization technology thereof, in particular to a heterogeneous material welding reliability characterization method applied to a brush type sealing structure. By means of the nanoindentation technology, mechanical properties such as hardness, elasticity modulus and plastic deformation of the welded joint are obtained by analyzing indenter deformation and indentation morphology. Meanwhile, indentation testing is carried out on different positions of the brush type sealing welding joint, and the performance comparison condition of all areas of the welding joint is obtained. Compared with a traditional reliability characterization means, the device and the method have the advantages that various areas of the heterogeneous welding joint including a base material, a heat affected zone and a fusion zone are tested under the nanoscale, various material performance indexes such as hardness, elasticity modulus and plastic deformation are measured at the same time, and the device and the method have high-precision and multifunctional testing capacity and are suitable for popularization and application. And moreover, the joint cannot be damaged or other properties cannot be influenced, and compared with a room-temperature stretching result, the nanoindentation technology has relatively high reliability and repeatability, and an accurate characterization result is obtained.

Provided is a laminate which is provided with a base sheet and a metal particle-containing layer that is laminated on the base sheet and contains metal particles, the base sheet having a contact surface that is in contact with the metal particle-containing layer, and the Young's modulus of the base sheet at 23 DEG C as determined by measuring the contact surface by a nanoindentation method being 0.01-10 GPa.

The invention discloses a die forging process method for prolonging the service life of a die, which comprises the following steps of: (1) designing the die, improving and optimizing the design structure of a single blank into combined forging of two blanks, dividing a die cavity into single blanks through saw cutting after widening, and reserving a special indentation for saw cutting during design; (2) forging the combined forge piece by adopting die forging equipment; and (3) after forging is completed, the combined forging piece is cut into two independent valve body products along the saw cutting guide indentations. According to the method, the design structure of the flange position of the single forging blank is improved in a combined forging mode, deformation and even cracking of the die caused by narrow and deep die stress concentration are improved, the service life of the die is prolonged, meanwhile, the situation of uneven flash can be effectively improved after design improvement, and the utilization rate of raw materials is increased.

The paperboard creasing device structurally comprises a box body, a rotating roller and a lower pressing roller, a paperboard is driven by the rotating roller to move, and when the paperboard passes through the box body, a second electric push rod pushes a limiting plate to move inwards under the action of a through hole, so that the limiting plate is adjusted to the size corresponding to the size of the paperboard, and the paperboard is pressed by the lower pressing roller. After the paperboard is moved, the situation that the position of the paperboard is inaccurate or deviates during indentation is prevented, a first electric push rod pushes a lifting frame to enable a lower pressing roller at the lower end and a rotating roller to limit the paperboard up and down, and a pushing plate is pushed downwards through the rotating roller to enable an annular indenting knife to make contact with the paperboard for indentation work; and under the condition that the fixing bolts are loosened, the fixing sleeve can drive the annular nicking cutter to move left and right, the annular nicking cutter is fixed after being adjusted to different positions for creasing work, operation is more convenient and faster, and the working efficiency is higher.

The invention discloses an in-situ force-displacement measuring device and method for a soft material, and belongs to the technical field of material mechanical property testing. The device comprises a base, three spherical supports symmetrically arranged on the base, a carrying disc carried on the spherical supports, and a weight set for applying a vertical load to the carrying disc. The top of the spherical support is coated with dye, and transfer paper is laid on the surface of the tested soft material; under the action of load, the ball body is pressed into the soft material to generate indentations, and the dye is transferred to the paper to form a dyeing area; the area or the equivalent diameter of a dyeing area is obtained through an image acquisition system, and a mapping relation between the area or the equivalent diameter and actual displacement is established in combination with a calibration curve, so that force-displacement response is indirectly obtained. The image processing comprises the sub-steps of preprocessing, binaryzation, morphological operation, connected domain analysis and the like. The calibration curve is established through fitting (u = a.Ab) of a displacement sensor and a power function. The device is simple in structure, low in cost and suitable for rapid and in-situ mechanical property screening and comparison testing of materials such as soft cushions and foam.

Provided is a plated member having, on an outer surface, a plated film composed mainly of chromium formed by using a trivalent chromium bath containing at least chromium, carbon, and oxygen, the plated film containing 60 at% or more of chromium and 1 at% to 30 at% of carbon, and having, on the outer surface, an indentation hardness of 11.1 GPa or more, and a degree of crystallinity calculated from a ratio of the integrated peak intensity of a measured value of an X-ray diffraction measurement and the following expression (1) is 5% or more. Degree of crystallinity (ratio of integrated peak intensity) = {(crystalline) / (crystalline + amorphous)} × 100% Here, the indentation hardness refers to a value obtained by instrumented indentation hardness measurement using a nanoindentation method (ISO 14577), and the integrated intensity ratio in expression (1) refers to a value determined in X-ray diffraction (XRD) analysis under conditions of 2θ: 30° to 60°, a half-width of crystalline: < 3, and a half-width of amorphous: ≥ 3.

The utility model discloses a printed product printing on-machine adaptive creasing device which comprises a creasing device body, a pressing roller is arranged in the middle of the creasing device body, a conveying belt is arranged on the lower side of the pressing roller, the pressing roller comprises a machine frame, rotating discs are rotationally connected to the front side and the rear side in the machine frame, and a cutter set is slidably connected between the rotating discs. The front end and the rear end of the cutter set are rotationally connected with sliding blocks, the sliding blocks are connected into the sliding grooves in a sliding mode, the cutter set is composed of a middle frame and blades arranged on the circumference of the outer side of the middle frame, and the cutting edge sections of the different blades are different. An indentation experiment is carried out through the pressing roller and the conveying belt, when the indentation height is adjusted, the sliding blocks are driven to move and the radial position is adjusted by rotating the side disc and the guide strip, when the blade needs to be adjusted, the positioning bolt is twisted out, the middle frame is rotated, then the cutting edge of the blade is changed, after adjustment is completed, the positioning bolt is inserted into the positioning groove, replacement of the blade is completed, and use is convenient.

Provided is a high-strength steel sheet having excellent member strength, stretch flangeability, bendability, and delayed fracture resistance under atmospheric corrosion and in a coated state. The steel sheet has a prescribed component composition, microstructure and the like, the average value [tau q] of the plastic deformation initiation stress [tau q] measured by nanoindentation at a position 1 / 4 of the sheet thickness of the steel sheet is 2.50-4.10 GPa, the standard deviation [sigma q] of the tau q is 0.30 GPa or less, and the average value [tau q] of the plastic deformation initiation stress [tau q] is 0.30 GPa or less. When [tau s] is the average value of the plastic deformation start stress [tau] s measured by the nanoindentation method at a position 10 [mu] m from the surface of the steel sheet, the ratio of measurement points less than 0.85 * [tau s] is 25.0% or less.

The application discloses a kind of automatic strip's indentation mold plate device, it is related to packaging technical field, including: feed module, including the material disc that is wound with indentation strip, several guide auxiliary wheels and the main press wheel for indentation strip is compressed to indentation bottom plate surface;For separating the paper of indentation strip, it is received between material disc and main press wheel along indentation strip conveying direction;Punching module, including cutting tool, for driving cutting tool to lift along Z axis direction punching power component and for driving cutting tool to rotate around Z axis rotary power component;Head main mounting plate, feed module, paper receiving module and punching module are all arranged in head main mounting plate, to form head;Molding platform;Head movement component, for controlling head relative to molding area along X axis and Y axis moves, and controls head relative to molding area rotates around Z axis;With feed module, paper receiving module, punching module and head movement component are all signal connection control device, and the efficiency and precision of plate making are high, and the scope of application is wide.

The application discloses a kind of thermoplastic composite continuous forming methods.The system includes successively in the direction of material travel: multiple roll unwinding mechanism, flattening arrangement, continuous mould pressing device and double steel belt presser.Wherein, continuous mould pressing device is made of multiple independent presser module, for applying 5-15MPa high pressure to realize the sufficient impregnation of resin to fiber;Double steel belt presser follows immediately, for applying 1-3MPa low pressure to eliminate surface indentation generated in mould pressing process.The application is by high pressure impregnation and low pressure finishing function clear distinction and collaborative use, overcome the technical contradiction that impregnation quality and surface quality are difficult to obtain in prior art, both ensure the excellent internal impregnation quality of composite material, also obtain high surface flatness, realize the continuous production of high-quality thermoplastic composite plate.

The invention discloses a preparation method and a test method of a thin film section nanoindentation test sample. The preparation method comprises the following steps: providing n cuboid samples, wherein the samples meet n * dgt; w, l: w = 1: 1-2: 1, d is the thickness of the sample, l is the length of the sample, and w is the width of the sample; the non-target crystal faces of the n samples are subjected to opposite bonding, the width of an opposite bonding seam is not larger than 1 micrometer, the target crystal faces of the n samples are located on the same side and spliced to form a test face, the test face comprises at least two different target crystal faces, and therefore the self-supporting opposite bonding sample is obtained, the test face of the opposite bonding sample is subjected to polishing treatment, and the self-supporting opposite bonding sample is obtained. And the surface roughness of the test surface is smaller than 5% of the preset indentation depth, so that the section sample is obtained. According to the invention, the test sample is prepared by adopting a sample opposite adhesion mode, so that a plurality of samples can provide a plurality of different sections to be tested, and the test efficiency is remarkably improved.

The utility model relates to the technical field of adhesive tape creasing, and discloses an adhesive tape production-based creasing device which comprises a shell, a top frame is fixedly connected to the top of the shell, a first motor is mounted in the top frame, a first driving shaft is fixedly connected to the output end of the first motor, a first gear is fixedly connected to the outer part of the first driving shaft, and a second gear is fixedly connected to the outer part of the first gear. The device comprises a shell, a plurality of sliding grooves are formed in the left side of the interior of the shell, two connecting rods are slidably connected to the interior of the shell, tensioning rollers are fixedly connected to the exteriors of the two connecting rods, racks are fixedly connected to the tops of the two connecting rods, and limiting shafts are fixedly connected to the sides, away from each other, of the two racks. And the bottoms of the two connecting rods are fixedly connected with limiting plates. According to the utility model, the tension of the adhesive tape in the transmission process is accurately adjusted, the problems of non-uniform indentation, tensile deformation and even breakage of the adhesive tape and the like caused by improper tension of the adhesive tape can be effectively avoided, and the qualified rate of products is improved.

The present invention relates to the field of hollow pouring technology, and specifically discloses a 3D hollow pouring seamless process, which includes the following steps: shaping, PET coating, indentation, PVC coating, mesh film, assembly, heating, body lamination, plaster mold, resin pouring, glue scraping, baking, transfer printing, demolding, oil sealing, and packaging and warehousing. The finished product has a 3D effect and texture, and the product specifications and sizes can also be freely selected. At the same time, the process can realize industrial assembly line batch production, greatly improving work efficiency (per capita daily output is more than 30,000 pieces) and the product qualification rate is also above 98%, thereby reducing production costs and allowing 3D hollow pouring process products to enter people's daily lives at a lower price.

Provided is a laminate having a low refractive index and excellent mechanical strength. This laminate (10) comprises a void layer (11) and an adhesive layer (12), the adhesive layer (12) being directly laminated on one or both surfaces of the void layer (11), the refractive index of the void layer (11) being 1.30 or less as measured in the state of the laminate (10), the nanoindentation hardness being 0.5 MPa or more as measured by pressing an indenter into the adhesive layer (12) by 2000 nm using a nanoindenter, and the refractive index of the void layer (11) being 1.30 or less as measured in the state of the laminate (10). The peel strength between the void layer (11) and the adhesive layer (12) measured using a tensile testing machine at a tensile speed of 0.3 m / min is 3 N / 25 mm or more.

The invention provides a nanoindentation testing method for a composite asphalt mixture, and relates to the technical field of asphalt material performance research. The method comprises the following steps: S1, preparing a double-solid waste epoxy resin composite asphalt mixture test piece; s2, grinding and polishing the test piece by adopting a step rotating speed and composite lubricating liquid synergistic process so as to obtain the surface smoothness meeting the nanoindentation test requirement; s3, acquiring a macroscopic elastic modulus of the test piece, and automatically generating nanoindentation test parameters according to the macroscopic elastic modulus through a pre-established Sigmoid mapping model; and S4, carrying out nanoindentation test according to the test parameters so as to evaluate the micro-mechanical properties of the asphalt mortar, the aggregate and the interface transition area. By reasonably designing the mix proportion and the production process, efficient utilization of the waste asphalt pavement material and the steel slag is achieved, the resource utilization rate is increased, sustainable development is promoted, and a high-performance, economical and environment-friendly solution is provided for road maintenance and repair engineering under complex climate conditions.

The present invention addresses the problem of providing a transparent laminate having high hardness and excellent bendability. A transparent laminate according to the present disclosure has a base material and a hard coat layer laminated on at least one surface of the base material, and is characterized in that: the pencil hardness of the hard coat layer surface at a load of 750 g is H or more; the transparent laminate has a minimum bendable radius of 1.5 mm or less when a cylindrical mandrel test is performed by recessing the surface of the hard coat layer of the transparent laminate, and the ratio of the indentation modulus to the indentation hardness (indentation modulus / indentation hardness) in a microhardness test of the transparent laminate is 6.0 or more.

The application relates to a method for calculating residual stress based on a nanoindentation technology, belongs to the technical field of residual stress detection, and modifies an existing nanoindentation residual stress detection model to obtain a more accurate nanoindentation residual stress calculation model. The solution comprises the following steps: S1, establishing a residual stress calculation model; S2, setting physical parameters of each engineering material respectively to obtain corresponding nanoindentation P-h curves; S3, adopting finite element simulation to determine load-depth curves of each engineering material under different residual stress conditions; S4, inversely calculating the size of residual stress through the load-depth curve and the residual stress calculation model; S5, comparing the set residual stress and the calculated residual stress to obtain a model correction value corresponding to each engineering material; and S6, fitting the correction values of different materials to obtain a correction value formula, and obtaining a residual stress calculation model suitable for each engineering material.