17 results about "Indentation testing" patented technology

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 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 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 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.

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.

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 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 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.

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 present application provides a device for testing the strength and plasticity of bulk and thin film metal materials, a collaborative robot is used to grab a sample tray from a sample library and send it to a designated position of a laser marking machine, move the sample tray from the laser marking machine to a sample table of a hardness tester, and put the sample tray after completing the sample test back to the sample library; the laser marking machine is used for laser marking treatment on the surface of the sample; the hardness tester is used for moving a light mirror to the laser marking position of the sample and completing sample focusing, and performing point-by-point indentation test on the sample and collecting indentation morphology; wherein, a tray base coupled and fixed with the sample tray is arranged on the sample table of the hardness tester; a plurality of sample trays are provided with a positioning device which can be coupled and fixed with the tray base on the sample table of the hardness tester; the sample library is used for storing a plurality of sample trays on which samples to be tested are placed. A control system is used to distribute corresponding control instructions to control other parts to work cooperatively until the sample test is completed.

The application discloses a kind of indentation test method and system suitable for complex curved surface parts, it is related to the technical field of material mechanical property test, the method comprises: confirming initial space coordinate system;The surface of the part to be tested is scanned by three-dimensional profilometer, three-dimensional topography data is obtained, curved surface equation is obtained, and tangent plane equation at target measuring point on the part to be tested is calculated;Confirm the angle between the plane intersection line of tangent plane and the initial space coordinate system and horizontal plane, and according to the angle and the preset interval between the telescopic rod, two telescopic rods are calculated and controlled to move;The center point coordinate of spherical hinge moving assembly, the projection point coordinate of vertical projection on the plane where the positioning table is located is calculated to calculate the coordinate of the center of positioning table, and the coordinate difference between projection point coordinate and the center coordinate is calculated to carry out indentation test to the target measuring point, the application can quickly, accurately and non-destructively carry out indentation test to complex curved surface parts.