37 results about "Indentation testing" patented technology

The present invention relates to an in-situ micro-nano impact indentation testing instrument, falling within the technical field of material micromechanical testing. The instrument comprises a nitrogen generation module, an environmental chamber, a high / low temperature loading module, an “optical-infrared” in-situ monitoring module, an “electromagnetic-piezoelectric” coupling impact module, etc. After the nitrogen is introduced into the environmental chamber and the test area is determined by microscopic imaging, the “electromagnetic-piezoelectric” coupling impact module can drive an indenter to indent a specimen. An acoustic emission sensor embedded in the high / low temperature loading module can monitor the surface crack propagation of the specimen. The “optical-infrared” in-situ monitoring module can perform real-time high-speed optical imaging and infrared imaging on the impact indentation process. The present invention can perform micro-nano impact indentation testing on the material at high or low temperatures.

The present invention provides a micro-nano impact indentation testing device and method based on cyclic refrigeration, and relates to the technical field of material property testing. The testing device comprises a pressure rod and a stage for low-temperature micro-nano impact indentation testing, and a refrigeration device for refrigerating and cooling the pressure rod and the stage, wherein the refrigeration device refrigerates the pressure rod and the stage by adopting an embedded channel, a cold conduction wire connected to the pressure rod and the stage and a refrigeration balancer in contact with the cold conduction wire are arranged between the pressure rod and the stage, and the temperature of the pressure rod and the temperature of the stage are stabilized at a common temperature point by the cold conduction wire and the refrigeration balancer together.

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.

This invention provides a test specimen and a method for testing the performance of a cutting tool coating. The specimen includes a specimen substrate and a coating covering the surface of the substrate. The surface of the specimen includes an outer peripheral surface, a first plane, and a second plane. The outer peripheral surface and the second plane intersect to form an edge. The edge is used for brushing tests, and the first plane is used for scratch or indentation tests. The method for testing the performance of the cutting tool coating includes performing an indentation or scratch test on the first plane and a brushing test on the edge. The specimen of this invention can be applied to various tests, and multiple tests can be performed on the same specimen, thereby reducing the number of specimens required in the research of cutting tools, thus saving testing costs and improving testing efficiency.

The invention relates to the field of material testing, and discloses an indentation testing device which comprises a supporting unit, a testing unit and a driving unit, an electric cylinder of the driving unit can drive a pre-contact assembly and an indentation assembly to reciprocate, so that rapid movement in a large range is realized, and a contact ball and a pressure head can rapidly approach a tested piece; the contact driver can drive the contact ball to reciprocate, so that the contact ball is in contact with the tested piece, and the contact ball is connected with an elastic body made of a memory alloy material; when the pressing head is pressed in, the piezoelectric stack of the driving unit is used for driving the pressing rod and the pressing head to move through the piezoelectric amplification mechanism, and the pressing-in precision of the pressing head is improved. According to the invention, the electric cylinder is used for macroscopic driving, and the piezoelectric stack is combined to precisely control the pressure head, so that the test precision and the test efficiency are improved, and a proper mechanical model is established after a press-in load-depth curve is obtained. The invention further provides an indentation testing method.

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.

The application discloses a kind of material indentation mechanical property testing device and method based on optical microscopy, it is related to material microscopic mechanical property testing technical field, the material indentation mechanical property testing device based on optical microscopy includes optical microscope, transparent indenter, sample table, force sensor, observation baffle, displacement sensor, load loading component and controller, in the indentation test process of material sample using transparent indenter, indentation image, indentation depth and indentation load under the contact state of transparent indenter and material are respectively collected in real time by optical microscope, displacement sensor and force sensor, and based on this, the mechanical property of material micro area in the indentation process of material sample can be characterized in real time, provide new technical means for material microscopic mechanical property testing technical field.

The invention discloses a device capable of being continuously used for pipeline welding seam detection and a detection method thereof, and relates to the technical field of pipeline welding seam detection.The device comprises a guide rail, the top of the guide rail is connected with a precision control box in a clamped mode, three first magnetic attraction devices are further installed at the bottom of the guide rail, and rotating buttons are arranged on the outer sides of the three first magnetic attraction devices; a rotary positioner is installed on the outer side wall of the precision control box and used for adjusting the position of a pressure head, continuous monitoring of different areas of a weld joint is achieved, and a to-be-detected weld joint pipeline is further adsorbed to the bottom end of the first magnetic attraction device and used for detection; by arranging the flexible guide rail and the magnetic attraction device, the device can be stably attracted to the surfaces of pipelines with different pipe diameters, and continuous and automatic movement and accurate positioning in the circumferential direction of the circumferential weld are achieved in combination with the precise control box and the rotary positioner. And rapid and continuous indentation testing and data acquisition can be performed on a plurality of key areas such as a base metal area, a heat affected area and a weld center area.

The invention provides a portable multifunctional rock mechanics testing machine and method, and relates to the technical field of rock mechanics tests. According to the portable multifunctional rock mechanics testing machine, an expansion test assembly, a uniaxial compression test assembly, a point load test assembly, an indentation test assembly or a compression-shear test assembly are selectively arranged between a telescopic rod of a loading oil cylinder and / or a force transducer. The testing machine disclosed by the invention is simple and light in structure, and can be conveniently carried to an engineering site to carry out a rock mechanical test, so that on-site loading and data acquisition of a rock sample are realized; the tester can accurately control stress and strain conditions and can realize stable and uniform loading and unloading on site so as to obtain a reliable test result; the testing machine integrates multifunctional testing, and different testing assemblies are matched with an expansion test, a uniaxial compression test, a point load test, an indentation test or a compression-shear test, so that multi-parameter testing is realized aiming at different rock sample conditions.

The utility model discloses a kind of physiological solution micro-sample mechanical property testing devices of circulation, including nanoindenter, control panel is arranged on the lateral wall of the nanoindenter, the lateral surface of the nanoindenter is provided with side door and can be closed and opened, physiological solution tank is placed in the inside of the nanoindenter and can be taken out from side door, sink is embedded on the workbench surface of the nanoindenter, test assembly is provided in the inside of the nanoindenter and is communicated with physiological solution tank. The utility model belongs to micro-sample test technical field, specifically solve the mechanical indentation test of micro-sample in prior art by means of nanoindenter, lack of testing in circulating physiological solution to micro-sample, there is a kind of physiological solution micro-sample mechanical property testing device of circulation to the limitation problem of existing technology.

The invention discloses a system and a method for carrying out an impact press-in test in a high-temperature environment, and belongs to the field of detection and metering. According to the invention, the high-temperature-resistant piezoelectric cantilever beam is used as an actuator, a high-temperature test part without a piezoelectric patch extends into the three-way high-temperature tubular furnace, and an impact press-in test in a high-temperature environment is repeatedly carried out; correcting a force signal measured by the force sensor in combination with a dynamical model of the pressure head to obtain a real press-in load borne by the sample in the impact press-in process; the pressure head is withdrawn from the surface of the sample for a certain distance before testing, so that the pressure head is impacted and pressed into the surface of the sample at the maximum impact speed; a matched three-way type high-temperature tube furnace is used, and a vertical port provides a passage for an optical displacement meter suitable for a high-temperature environment, so that the displacement of the free end of the high-temperature-resistant piezoelectric cantilever beam generated in the impact press-in process is measured. The high-temperature impact press-in test device is applied to impact press-in test of engineering devices in a high-temperature environment and characterizes dynamic mechanical properties in the high-temperature environment.

The present application relates to a kind of micro-nano indentation contact area deformation test method and device, belong to material microscopic mechanical property testing technical field, its surface to be tested sample is coated with speckle, and directly contact with speckle is used to transparent indenter, the nanometer speckle between indenter and sample is observed by optical microscope, the three-dimensional deformation behavior information of contact area in the process of micro-nano indentation test is obtained, the phenomenon such as crack, extrusion, slip band generation in the existing micro-nano indentation test can be in-situ characterization, and the three-dimensional process model of the deformation behavior of material under indenter is constructed, the method is strong in operability, solve the problem that existing in-situ observation means cannot directly characterize the deformation of contact area in the process of block sample indentation test, improve the understanding of the micro-nano contact mechanical behavior of various materials.

The invention discloses an indentation testing method and system suitable for a complex curved surface part, and relates to the technical field of material mechanical property tests.The method comprises the steps that an initial space coordinate system is confirmed; scanning the surface of the to-be-measured part through a three-dimensional contourgraph to obtain three-dimensional shape data and a curved surface equation, and calculating a tangent plane equation at a target measuring point on the to-be-measured part; determining an included angle between a plane intersection line between a tangent plane and the initial space coordinate system and a horizontal plane, and calculating and controlling the two telescopic rods to move according to the included angle and a preset interval between the telescopic rods; and calculating a central point coordinate of the spherical hinge moving assembly and a projection point coordinate of vertical projection on the plane where the positioning table is located so as to calculate a coordinate of the center of the positioning table, and calculating a coordinate difference between the projection point coordinate and the central coordinate so as to carry out indentation testing on the target measuring point. According to the invention, the indentation test can be rapidly, accurately and non-destructively carried out on the complex curved surface part.

The present invention relates to the field of nanoindentation testing technology. The present invention discloses a nanoindentation testing device, comprising a frame, an indentation testing mechanism, a stage, a laser light source, a sealed chamber, an atmosphere simulation mechanism and a vacuum mechanism, wherein the indentation testing mechanism comprises an indenter, a drive system and a measurement system, the indenter moves along a vertical axis; the laser light source faces the stage; the sealed chamber and the indenter are located on the same vertical axis, the stage is located in the sealed chamber, the indenter extends into the sealed chamber from the indenter avoidance port, the sealed chamber is provided with a laser avoidance window, the laser avoidance window is located on the laser light path, and the sealed chamber is also provided with a gas inlet and a gas outlet. The present invention can achieve non-contact local heating by directly acting on a sample to be tested in the sealed chamber through the laser light source; through the cooperation of the sealed chamber with the atmosphere simulation mechanism and the vacuum mechanism, the sample to be tested can be tested under vacuum, inert atmosphere or specific working atmosphere conditions.

Disclosed is a display device including: a display panel; a polarizing member overlapping the display panel; a cover window overlapping the polarizing member; and a window bonding member provided between the polarizing member and the cover window, wherein a penetration depth of the window bonding member measured by an indentation tester is equal to or less than approximately 13 µm.

To provide an indentation test apparatus and a method for an indentation test capable of measuring the Young's modulus and the dynamic viscoelasticity of a sample with higher accuracy.SOLUTION: The indentation test apparatus for pressing an indenter into a sample includes: an indenter; an actuator configured to displace the indenter in a vertical direction; a displacement sensor configured to measure the position of the indenter; a load measuring unit configured to measure the load applied to the indenter; a first temperature control unit configured to adjust the temperature of the indenter; and a second temperature control unit disposed below the indenter and configured to adjust the temperature of the sample.SELECTED DRAWING: Figure 1

Provided is a method of evaluating hardness of a ceramic material by using computational simulation, including a first operation in which a crystal structure model reflecting a kind and amount of an element to be added to a material, a second operation in which a stabilized structure, in which the crystal structure model has the lowest energy, of the crystal structure model is selected, a third operation in which a plurality of modified models having a series of strains with respect to the stabilized structure are generated, a fourth operation in which elastic moduli about respective modified models are calculated from the strains and energy, and a fifth operation in which a finite element analysis (FEA) program simulating an indentation test on a crystal structure is modeled, and the elastic moduli are substituted into the FEA program to extract physical property data about the crystal structure model.

The present invention relates to a momentum exchange driven impact indentation testing device and testing method. The device comprises a driving unit, a measuring unit, a positioning and point changing unit, and an in-situ observation unit. The modular unit adopts a momentum exchange method to drive the indenter to press into the test piece. The measuring unit picks up the force and displacement information during the impact indentation test. The in-situ observation unit records the deformation and heat distribution of the test piece in real time. The motion characteristics and program automatic control of the driving unit avoid secondary impact. The testing device of the present invention provides the necessary experimental means and testing device for testing and analyzing the mechanical properties of materials under high strain rates, and has good application prospects in the fields of aerospace, armor protection, and physical property characterization.

The application provides a service condition-based indentation prediction method for mechanical properties of a hydrogen conveying pipeline in service, hydrogen permeation testing is performed on the pipeline after sample processing in a hydrogen environment, steady-state hydrogen permeation flux and effective hydrogen diffusion coefficient of the hydrogen conveying pipeline material to be tested are obtained, a finite element model is established based on the steady-state hydrogen permeation flux and the effective hydrogen diffusion coefficient of the hydrogen conveying pipeline material, and the mechanical properties of the pipeline are predicted based on the adjusted parameters for hydrogen environment mechanical testing on the tensile sample and the fracture toughness sample; indentation testing is performed on the pipeline by using the indentation method to obtain the mechanical properties of the pipeline, the actual mechanical properties of the pipeline can be obtained based on the predicted mechanical properties of the pipeline and the mechanical properties of the pipeline obtained by the indentation testing, the mechanical property parameters of the pipeline can be quickly and accurately obtained, the mechanical properties of the hydrogen conveying pipeline to be tested in the actual service environment can be truly reflected, the prediction result is closer to the real data, and the method has engineering practicability.

The application discloses a measurement method and a measurement device for the indentation depth of in-situ indentation testing of a high-temperature monitored component, and comprises the following steps: S10, before the indentation testing, speckle marking is performed on the surface of an indenter; S20, during the indentation testing, a real-time temperature field distribution, a real-time speckle distribution and a real-time indentation load of the surface of the indenter are captured; S30, according to the parameters obtained in the step S20, a formula for calculating the elastic compression deformation of the indenter is fitted; the displacement distribution of the indenter is calculated by using a digital image correlation method, and a displacement change formula of different positions of the indenter is fitted, U=U0+f U (L); S50, according to the formula fitted in the step S40, the overall translation U0 of the indenter is obtained, and the indentation depth h t of the indenter after the flexibility compensation is calculated, wherein h t =U0-ΔL. The measurement method adopts a non-contact method to monitor the deformation of the indenter of an indentation testing machine, combines the temperature distribution, compensates the deformation of the indenter, and ensures the accurate measurement of the real indentation depth.

This utility model discloses a quick-release fixture for an indenter, comprising: a main board with an open slot, a sliding groove communicating with the open slot, and guide rails corresponding to the open slot and the sliding groove, wherein the indenter can extend into the open slot and move along the guide rail within the sliding groove; a fixing mechanism connected to opposite sides of the main board for a detachable connection between the main board and the object to be tested; a positioning block that can move along the guide rail within the sliding groove, and is locked and unlocked by a locking mechanism; the locking mechanism unlocks the positioning block, allowing it to move along the guide rail to the target position in the sliding groove; the locking mechanism then locks the positioning block, allowing it to remain at the target position in the sliding groove; the indenter moves along the guide rail within the sliding groove until it abuts against the positioning block, thus achieving indentation point positioning by the indenter. The fixing mechanism of this utility model fixes the quick-release fixture to the metal surface to be tested, moves the positioning block to the target position, locks it with the locking mechanism, inserts it into the indenter, and completes the test, resulting in high testing efficiency and accurate data.

The invention discloses a method for evaluating early deterioration of a dissimilar steel welded joint based on a multi-non-destructive detection technology, and the method comprises the steps: measuring a second-order nonlinear coefficient of the welded joint through a nonlinear ultrasonic detection system, and evaluating the change of a microstructure; measuring magnetic performance parameters of a welding joint by customizing a magnetic Barkhausen noise sensor system, and evaluating stress and microstructure evolution; measuring the hardness and other mechanical properties of the welding joint through an instrumented indentation tester, and evaluating the deterioration degree of the material; associating the obtained detection parameters, and dividing the deterioration state of the welding joint into an initial stage, a middle stage and a final stage based on a predefined threshold value; and in combination with the detection parameters and microstructure evolution data, constructing a life prediction model based on fatigue-creep interaction, and predicting the residual life of the joint. According to the method, the perspectiveness of degradation identification and the accuracy of life prediction are remarkably improved (the error is smaller than + / -8%), and the method has good engineering applicability and popularization value.

The invention relates to the technical field of rock mechanics, in particular to a rock mechanical property characterization method and equipment based on indentation test and machine learning, and the method comprises the following steps: carrying out basic mechanical test and indentation test of multi-lithology and multi-type rocks, and obtaining basic mechanical parameters and indentation indexes of the rocks; establishing an indentation-mechanics integrated parameter database comprising basic rock mechanics parameters and indentation indexes; carrying out correlation analysis between the rock indentation index and the basic mechanical parameters by utilizing a correlation analysis function, and establishing a rock basic mechanical parameter evaluation model based on the indentation index through machine learning; and developing an integrated handheld on-site indentation tester and carrying out on-site testing to obtain rock mechanical characteristics. The method can be realized on a complex engineering site, and provides data support for safety construction, stability evaluation, support mode selection and support technical parameter optimization of subsequent mines, so as to meet the technical requirements of safety and high efficiency of mine resources.

The application discloses a yield strength correction calculation method for instrumented indentation method, which comprises the following steps: a target material is subjected to cyclic loading test by using an instrumented indentation tester to obtain a load-displacement curve, and true stress and true strain are obtained by the load-displacement curve, and the true stress and true strain measuring points have all entered a plastic hardening stage, and the yield strength cannot be accurately extrapolated. The instrumented indentation method can very accurately obtain the tensile strength, and it can be considered that no matter whether there is a yield platform, the constitutive curve of the plastic hardening stage of the material constitutive relation remains unchanged, that is, the strengthening coefficient K and the strain hardening index n obtained by fitting the Holloman equation in this part remain unchanged, and due to the existence of the yield platform, the plastic hardening stage of the constitutive curve is translated as a whole to obtain a new constitutive equation, and the influence of the yield platform can be considered. The application improves the precision of the instrumented indentation method in on-site detection of the yield strength of steel structure materials.

The invention discloses a method for synchronously acquiring hardness and thickness of a film in a film substrate system, which relates to the technical field of surface coating, and comprises the following steps: carrying out indentation test on a first film substrate system with known film thickness to obtain a plurality of groups of first data; inputting the multiple groups of first data into a hardness-depth model for fitting to obtain a first curve and returning the first curve to infinity to obtain the hardness of the substrate and a calibration value of a hardness distribution parameter; performing indentation test on a second film substrate system which is unknown in film thickness and adopts the same material to obtain multiple groups of second data; the hardness of the substrate, the calibration value and the multiple sets of second data are input into a hardness-depth model for fitting, and the film thickness is obtained; and the film thickness, the substrate hardness and the multiple sets of second data are input into the hardness-depth model for fitting, a second curve is obtained, the second curve is regressed to the depth of 0, and the hardness of the film is obtained. According to the invention, the dependence of fitting quality on data in a wide range is reduced.

The utility model relates to the technical field of pipeline testing devices, and discloses an indentation testing device for pipeline welding seam detection, which comprises a plurality of support plates, a plurality of indentation testing components and a fixing part, the plurality of support plates are planar plates and are arranged in a line, the plurality of indentation testing components are connected to the middle parts of the support plates in a one-to-one correspondence manner, and the fixing part is connected with the indentation testing components in a one-to-one correspondence manner. The indentation testing assembly comprises a pressure head used for applying indentations to the outer wall of the pipeline and a telescopic push rod used for providing loading driving force for the pressure head, the multiple supporting plates wrap the outer wall of the pipeline so that the pressure head in the indentation testing assembly can extend in the direction of the center line of the pipeline, and the fixing piece is connected with the two supporting plates on the outermost side to fix the indentation testing assembly. The supporting plates are fixed to the outer wall of the pipeline by clamping the outer wall of the pipeline. According to the device, multi-position synchronous nondestructive testing high-flux indentation testing can be carried out on the pipeline welding seam in the environment of the same time period and the same temperature and humidity, and the accuracy and comparability of experimental data are guaranteed.

This invention discloses a method for measuring Brinell hardness by indentation, comprising: S1, selecting two hardness standards, wherein the hardness value of the sample to be tested is within H... BW 1 and H BW Between 2; S2, use the sample to be tested to perform indentation testing on the testing machine to obtain the corresponding maximum indentation depth h. max 1. h max 2. The test load F is used to calculate the indentation depths h1 and h2; S3. Using h1, h2, and h max 1. h max 2. Based on F, two sets of stiffness data K1 and K2 of the testing machine are obtained; S4. Based on K1 and K2, the corrected stiffness K of the testing machine is obtained. m S5. Obtain the maximum indentation depth h of the sample to be tested. max 3. According to h max 3. K m Obtain the corrected indentation depth h3; S6, derive the Brinell hardness H of the sample based on h3. BW 3. By incorporating the above measurement methods into a program, automated stiffness correction and automated hardness testing can be achieved.

The utility model discloses a device for testing indentations on the surface of a raceway of a tapered roller bearing. The device comprises a connecting seat, a shell, a lower bearing seat, an upper bearing seat, a main shaft, two bearings to be tested, a dismounting sleeve, a cover plate and a pressure sensor. A threaded through hole is formed in the center of the connecting seat; the shell is mounted on the top surface of the connecting seat; the lower bearing seat is coaxially arranged at the lower part in the sleeve of the shell; the upper bearing seat is coaxially arranged in the sleeve of the shell and is positioned above the lower bearing seat; the main shaft is coaxially arranged in a test cavity formed by the lower bearing seat and the upper bearing seat, and the upper end of the main shaft is connected with the driving mechanism; the two bearings to be measured are sleeved on the lower part of the main shaft; the dismounting sleeve is installed on the main shaft through a key and is located between the two bearings to be tested. The cover plate is mounted on the top surface of the shell; the pressure sensor is installed in the through hole of the shell, and the bottom of the pressure sensor is provided with an axial abutting bolt installed in the threaded penetrating hole of the connecting base. According to the utility model, the wear resistance of the bearing raceway can be detected.

The invention discloses a deep hole ground stress in-situ test method and system based on a wall surface indentation method. The method comprises the following steps: acquiring a rock mass in-situ elastic modulus by adopting an Oliver-Pharr method; acquiring a small-diameter rock core sample at a test point, comparing an indentation load-displacement curve under an unstressed condition with in-situ hole wall indentation load-displacement curves in three different directions, and combining an indentation test load-displacement curve correction coefficient under a real rock mass condition to obtain indentation load-displacement curve variation in different directions; establishing a deep borehole complex environment hole wall multidirectional indentation method finite element calculation simulation model, and simulating an indentation test in a complex environment to obtain an indentation load-stress conversion tensor matrix in a deep hole special environment; integrating the relationship between the hole wall stress and the far-field stress and the in-situ hole wall indentation load-displacement curve variation in different directions at the field test point, and solving a far-field crustal stress component through a least square method; and high-precision, high-efficiency and low-disturbance in-situ testing of ground stress in a deep hole complex environment is realized.