54 results about "Indentation testing" patented technology

The embodiment of the invention relates to the technical field of rock mechanics, in particular to a rock micromechanical property determination method, device and equipment, and the method comprises the following steps: carrying out indentation test on a target area on the surface of a rock sample to obtain micromechanical response data of the rock sample; the micro-mechanical response data represents the change relationship between the micro-mechanical response of the rock sample and time; scanning a target area on the surface of the rock sample in the indentation test process to obtain microstructure evolution data corresponding to the micromechanical response data; the microstructure evolution data represents a change relationship between the microstructure of the rock sample and time; and determining the micromechanical properties of the rock sample according to the micromechanical response data of the rock sample and the corresponding microstructure evolution data. According to the embodiment of the invention, the heterogeneous micro-mechanical property of the rock can be accurately represented based on collaborative analysis of the micro-mechanical response and the microstructure of the rock sample at multiple time points, and dynamic, in-situ and quantitative representation of the micro-mechanical property of the rock is realized.

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 discloses a rapid dot matrix micro-nano impact indentation testing system. The rapid dot matrix micro-nano impact indentation testing system comprises a three-dimensional electric positioning module, wherein the three-dimensional electric positioning module comprises an XY translation stage and a Z-axis lifting stage; a dot matrix impact indentation module, wherein the dot matrix impact indentation module comprises a three-degree-of-freedom piezoelectric platform arranged on the Z-axis lifting stage, one surface of the three-degree-of-freedom piezoelectric platform is provided with a piezoelectric ceramic actuator, and one end of the piezoelectric ceramic actuator is connected to an indenter; a clamp, wherein the clamp clamps a test piece, and the test piece faces the indenter; and an imaging module, wherein the imaging module comprises a microscope lens. The system can achieve in-situ micro-nano impact indentation test and rapid dot matrix indentation, and has higher indentation precision.

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 laser-driven high-strain-rate micro-nano impact indentation testing method, and belongs to the field of precision testing. The method comprises the following steps: (1) determining a laser shock position on the surface of an elastomer, and laying an absorption layer at a corresponding position; (2) a transparent restraint layer is laid on the surface of the absorption layer, and an impact component composed of a pressing head, an elastic body, the absorption layer and the restraint layer is constructed; (3) adjusting the position of an impact part to be positioned on a laser focus plane, and simultaneously ensuring that a laser spot, a pressure head and a to-be-impacted area of the sample are coaxial; (4) adjusting the position of the sample to enable the distance between the sample and the tip of the pressure head to be 0-1mm; and (5) adjusting parameters of the laser device and the high-speed camera, synchronously starting the laser device and the high-speed camera, carrying out laser-driven high-strain-rate micro-nano impact indentation test, shooting indentation and ejection processes of the indenter in real time, and measuring speed characteristics. The method is realized by integrating laser shock and an elastic deformation mechanism, and has a relatively high strain rate for testing under a micro scale.

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 invention discloses a method for rapidly detecting the depth of a damaged layer of a CVD single crystal diamond. The depth of the damaged layer of a substrate material is tested by a continuous indentation test, and a micro-indentation test method is proposed to evaluate the total damage of a CVD diamond processing surface. The damage caused by the micro-indentation test is small enough to be eliminated during the processing. The method has the characteristics of rapidity, low cost, strong operability, etc., and can be used for rapid detection and evaluation of damaged layers in different processing flows of diamond materials, and has certain guiding significance for optimizing material processing parameters and the processing time of the next process.

The invention provides a metal pipeline strength testing method which comprises the following steps: performing surface indentation testing on a testing point position of a to-be-tested pipeline to obtain indentation strength; indentation correction information is obtained, the indentation correction information comprises a correction coefficient between the indentation strength and the actual strength of the to-be-tested pipeline, the actual strength is obtained by conducting a tensile test on a sample manufactured at the position, corresponding to the test point position, of the simulated pipeline, and the simulated pipeline and the to-be-tested pipeline are the same in material, structure and welding process; and determining the strength of the to-be-tested pipeline at the test point according to the indentation correction information and the indentation strength. The problem that in the prior art, an in-service pipeline does not have a material micro-damage strength detection method is solved.

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.

The invention relates to the technical field of nanoindentation testing, and discloses a nanoindentation testing device which comprises a rack, an indentation testing mechanism, an objective table, a laser light source, a sealing cavity, an atmosphere simulation mechanism and a vacuum mechanism, the indentation testing mechanism comprises a pressing head, a driving system and a measuring system, and the pressing head moves along the vertical axis; the laser light source faces the objective table; the sealing cavity and the pressing head are located on the same vertical axis, the objective table is located in the sealing cavity, the pressing head stretches into the sealing cavity from the pressing head avoiding opening, the sealing cavity is provided with a laser avoiding window, the laser avoiding window is located on a laser light path, and the sealing cavity is further provided with a gas inlet and a gas outlet. According to the invention, the laser light source directly acts on the sample to be tested in the sealed chamber, so that non-contact local heating can be realized; through the cooperation of the sealed chamber, the atmosphere simulation mechanism and the vacuum mechanism, the sample to be tested can be tested under the conditions of vacuum, inert atmosphere or specific working atmosphere.

The present invention relates to a high strain rate nano-indentation testing device and method, comprising a laser focuser, facing an indentation mechanism, for emitting a short pulse laser beam to the top of the indentation mechanism and inducing an explosive plasma; the indentation mechanism, comprising a guide rod located inside a housing and moving along a vertical axis, the guide rod head end being connected to a pressure head, the guide rod tail end facing the laser focuser, the generated explosive plasma pushing the guide rod and the pressure head, the pressure head pressing against a material to be tested carried on a stage; the stage, located in the space below the pressure head, for carrying the material to be tested, the material to be tested receives the pressure of the pressure head to generate an indentation. The process of the explosive plasma pushing the guide rod and the pressure head to press against the material to be tested can simulate the dynamic response process of the material under the influence of high-speed loading such as explosion, high-speed collision and dynamic fracture, thereby realizing high-speed loading of the material, that is, dynamic performance testing under high strain rate.

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 present invention discloses an in-situ micro-nano indentation testing system and method in an ultra-high temperature water-oxygen environment. The present invention changes the horizontally placed protective pipe in the traditional tube furnace into a vertically placed one, and the pressure rod and the sample platform enter from both ends of the vertically placed protective pipe, respectively, which not only avoids drilling holes on the pipe wall, but also avoids the use of a large-diameter protective pipe so as to use a longer pressure rod; the present invention uses a long-range slide rail, and during the water-oxygen assessment of the sample, the box is moved to a place away from the pressure rod driver through the slide rail. After the water-oxygen assessment is completed, the box is moved to the bottom of the pressure rod through the slide rail to complete the indentation test; the present invention adopts an integrated design, and can carry out in-situ micro-nano indentation testing after any water-oxygen ratio assessment of the coating sample in a high temperature environment of 1600°C, so as to realize the in-situ characterization of the mechanical properties of the coating sample in an ultra-high temperature water-oxygen environment, with high feasibility and simple operation.

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.