32 results about "Fretting" patented technology

An in-situ fretting corrosion fatigue testing machine based on synchrotron radiation diffraction and three-dimensional (3D) imaging includes an axial fatigue loading system, a fretting loading system, and a corrosion environment control system, where the axial fatigue loading system includes a driving device, a load control device, and a load sensing device; the load sensing device is configured to measure an axial force and a normal force in real time; the driving device is configured to drive the load control device, thereby achieving axial displacement of the load control device; the load control device is configured to carry out axial fatigue loading of a specimen; and the fretting loading system includes a fretting wear device. The testing machine achieves real-time 3D imaging characterization of wear spot and crack morphology of a material in a fretting corrosion environment, as well as characterization of a residual stress evolution law.

The invention discloses a method for laser-assisted composite ultrasonic strengthening treatment of a titanium alloy, a product and application, and belongs to the technical field of metal material surface treatment.The method comprises the following steps that a composite gradient nanometer strengthening layer is prepared on the surface of the titanium alloy by combining laser with an ultrasonic nanometer surface modification and ultrasonic surface rolling treatment technology. The invention further provides the titanium alloy prepared through the method and application of the titanium alloy in the aviation field. According to the LA-UNSM + USRP technology, the surface damage of the titanium alloy is reduced, a stable composite gradient nanometer strengthening layer and a residual compressive stress field are provided, and the purpose of continuously and effectively improving the high-temperature fretting fatigue performance of the titanium alloy in the high-temperature fretting fatigue process of the titanium alloy can be achieved.

The present invention discloses a method for constructing a high-temperature fretting fatigue life prediction model considering surface hardness. It belongs to the field of fretting fatigue life prediction simulation; the model is based on a nonlinear fatigue cumulative damage model, and according to the difference in surface hardness of heterogeneous contact materials, a damage accumulation rate factor considering hardness is introduced to obtain a life model suitable for fretting fatigue. Since hardness changes with temperature, a temperature-related damage rate factor is introduced to consider the influence of temperature on the fretting fatigue behavior of the structure. The application method of the model requires the use of ANSYS finite element software, and the specific steps are: 1) establish a finite element model; 2) perform finite element simulation calculations on contact problems; 3) post-process the calculation results; 4) perform parameter fitting; 5) obtain the fretting fatigue prediction life. The model and application method can effectively predict the high-temperature fretting fatigue life under heterogeneous material contact, which has important engineering significance.

The invention relates to a preparation process optimization method of a zirconium alloy material with high fretting wear resistance, which comprises the following steps: setting a chemical component optimization range of a zirconium alloy, including specific proportions of tin, iron, niobium, chromium and oxygen elements; establishing a computer simulation model, and predicting the wear volume, tribological stability and microstructure evolution of the material under the fretting wear condition; then, a complete optimization scheme is output based on the model optimization homogenization treatment temperature interval, the hot working deformation range, the cold working cumulative deformation degree and the annealing system; and finally, a preparation process sequence including smelting, homogenization treatment, hot working deformation, cold working deformation and final heat treatment is implemented, the zirconium alloy material with the equiaxed grain structure is prepared, and the wear resistance of the zirconium alloy material is verified through an experimental fretting wear performance test. Compared with the prior art, the method has the advantages that through systematic component design and process parameter simulation optimization, the material performance is remarkably improved, and the application reliability is enhanced.

According to the fretting wear test device in the high-temperature gas environment, the double-layer test cavity capable of simulating the high-temperature gas environment is designed, high temperature, gas components and pressure conditions are adjusted through the heating unit and the gas control module, and it is ensured that the test is conducted under the condition close to the actual service condition; by loading different normal forces, high frequency and variable displacement amplitude, fretting wear behaviors in a high-temperature gas environment are simulated so as to research the wear characteristics between the sample and a wear pair, and meanwhile, high-temperature-resistant materials such as a double-layer shell structure and a high-purity alumina fiber material are adopted, so that the double-layer test cavity can bear the high-temperature environment, and the wear resistance of the sample is improved. And heat is effectively isolated to ensure operation safety. And finally, the temperature and the air pressure in the test cavity are monitored in real time through a heating piece and an external driving system, so that the temperature and the pressure in the test process are stabilized in a set range, and damage to equipment caused by overheating or overpressure is avoided.

The invention discloses a milling material surface fretting wear prediction method, and relates to the technical field of fretting wear. Comprising the following steps: acquiring a fretting wear sample on the surface of an unprocessed material and a fretting wear sample on the surface of a milled material; based on nonlinear fitting and the fretting wear sample of the surface of the unprocessed material, establishing a function relationship between the friction coefficient and the wear coefficient of the surface of the unprocessed material and the change of the fretting parameter; establishing a finite element model to obtain a plurality of groups of simulated fretting wear samples; the simulated fretting wear sample is substituted into a BPNN neural network model for training, after training is finished, based on a transfer learning method, the fretting wear sample on the surface of the unprocessed material and the fretting wear sample on the surface of the milled material are sequentially utilized for fine tuning, and a model BPNN-TLM is obtained; and on the basis of the model BPNN-TLM, the fretting wear can be predicted. The method is relatively low in cost and high in prediction accuracy.

The invention discloses a milling material fretting wear prediction method based on a small sample, and relates to the technical field of informatization planning. The method comprises the following steps: obtaining fretting wear samples on the surface of a milling material based on a physical experiment: sequentially changing fretting wear parameters of the surface of the milling material based on a reference test point to obtain four groups of fretting wear samples; based on the relationship between the fretting wear parameters and the fretting wear, establishing a model for predicting the fretting wear; taking a standard deviation between a predicted energy wear rate and a wear measured value as a minimum target, sequentially substituting a cycle index sample, a contact stress sample, a displacement amplitude sample and a frequency sample, and fitting the model to obtain a model capable of predicting fretting wear of the surface of the milling material; and the fretting wear of the surface of the milling material can be predicted based on the model. According to the method, the fretting wear of the milling material can be predicted only through a small number of samples, the cost is low, and the prediction precision is high.

The utility model discloses a punching composite fretting wear test fixture. The punching composite fretting wear test fixture comprises a tangential moving assembly, a tangential fixture for clamping a rod-shaped sample, a radial moving assembly and a radial fixture for clamping the rod-shaped sample, the tangential clamp is opposite to the radial clamp; the tangential clamp is fixed to the tangential moving assembly, and the tangential moving assembly drives the tangential clamp to move back and forth in the tangential direction. The radial clamp is fixed to the radial moving assembly, and the radial moving assembly drives the radial clamp to move back and forth in the radial direction. The device is used for clamping a rod-shaped sample and driving the rod-shaped sample to move in the tangential direction and the radial direction, tangential fretting and impact fretting wear tests are carried out on the surface of the rod-shaped sample, the wear condition of the sample under the actual working condition is truly reflected, and the surface punching composite fretting wear performance of different materials is tested.

The invention discloses a high-frequency and high-precision fretting friction wear testing device which comprises a workbench, a reciprocating motion loading assembly, a fixing plate, a force measuring assembly, a vertical force loading assembly and a displacement measuring and recording assembly. The reciprocating motion loading assembly outputs reciprocating motion in the first horizontal direction to the sample rod, so that mutual friction motion occurs between the movable sample and the fixed sample. The force measuring assembly can obtain friction force between the movable sample and the fixed sample, and the displacement measuring and recording assembly can obtain relative displacement of the movable sample and the fixed sample in the first horizontal direction. By adopting the high-frequency and high-precision fretting friction wear testing device, various wear resistance experiments can be realized, and the accuracy of the wear resistance experiments can be improved, such as wear resistance experiments of materials under different vertical loading forces, wear resistance experiments of movable samples and fixed samples made of the same material, and wear resistance experiments of the fixed samples and the movable samples made of the same material. And carrying out abrasion resistance test on the movable test sample and the fixed test sample made of different materials.

The invention relates to a design method of a diamond-like carbon wear-resistant coating for a zirconium alloy component of a nuclear reactor, which comprises the following steps: establishing a fretting wear prediction model of the zirconium alloy component in a nuclear reactor environment, and calibrating the model based on experimental data to simulate flow-induced vibration and contact stress distribution; the performance parameters of the diamond-like carbon coating are designed through an optimization algorithm by utilizing model output and combining friction coefficient and wear rate data; based on the design parameters, simulating and optimizing the coating preparation process through a process simulation model, so that the coating is firmly combined with the substrate; and finally, verifying the long-term wear performance of the coating through experiments to finish design verification. Compared with the prior art, through the systematic design process, the fretting wear resistance of the coating is remarkably improved, the problem that zirconium alloy parts are worn due to flow-induced vibration is effectively solved, the service life of the parts is prolonged, and the operation safety of a nuclear reactor is guaranteed.

This invention relates to a method for predicting the wear performance of aluminum alloy surfaces using self-lubricating composite ultrasonic shot peening. The method first pre-treats the aluminum alloy surface, then textures the surface using laser processing, fills it with a self-lubricating material, and finally performs ultrasonic shot peening to form a mechanically interlocking structure that enhances the bonding strength of the filler layer. Ultrasonic shot peening creates a fine-grained strengthening layer and a residual compressive stress field on the substrate surface, significantly improving surface hardness and fatigue resistance. Simultaneously, this invention provides a wear performance prediction method based on ABAQUS simulation. By simulating the ultrasonic shot peening process using DEM-FEM coupling, a fretting wear model is constructed, and energy wear theory is used to predict the friction coefficient and wear rate. This method achieves four benefits for aluminum alloy surfaces: lubrication and friction reduction, mechanical interlocking, surface strengthening, and fatigue resistance. It can also predict wear performance in advance, guide process optimization, significantly improve R&D efficiency, and reduce experimental costs.

The invention discloses a test panel and an impact damage assessment device, the test panel comprises a base plate and a composite material plate, the composite material plate is arranged on the front surface of the base plate, the test panel further comprises a reinforcing plate and a reinforcing sheet, the reinforcing plate is located on the front surface of the composite material plate, and the reinforcing sheet is located between the reinforcing plate and the composite material plate; the base plate, the composite material plate, the reinforcing sheet and the reinforcing plate are connected through bolts. According to the scheme, the reinforcing plate is used for replacing the composite material plate to bear the pressing force of the bolt head so as to reduce damage to the composite material plate, the strength of the reinforcing plate is larger than that of the composite material plate, larger pressing force can be applied to the reinforcing plate, and then the pressing force acting on the composite material plate is increased; the firmness and stability of connection between the composite material plate and the substrate are improved, and the risks of torsional deformation of the composite material plate and layering of the edge and the substrate are reduced; meanwhile, fretting wear between the bolt and the mounting hole of the composite material plate can be reduced through the reinforcing sheet, and abnormal damage caused by expansion of the mounting hole is reduced.

The application discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction and wear performance test. The device comprises a magnetic field generating module, a magnetic attraction force closed-loop regulation and control system, a friction and wear test platform and an atmosphere environment control mechanism. The friction and wear test platform comprises a fretting friction and wear module and a sliding friction and wear module. The fretting friction and wear module and the sliding friction and wear module are respectively used for fretting friction and wear test and sliding friction and wear test of the sample to be tested. The atmosphere environment control mechanism is used for controlling the atmosphere environment of the sample to be tested. The application can solve the technical bottleneck that the traditional device cannot dynamically match the magnetic field and mechanical parameters, lacks multi-mode friction and wear test simulation and controllable atmosphere environment, significantly improves the reliability and applicability of test data, and provides technical support for the research on material friction and wear behavior under a complex magnetic field environment.

The present invention relates to a simulation modeling method for the double-curved rough surface of a preformed wire clamp, including the following steps: S1. Determine the structural parameters of the preformed wire clamp; S2. Construct a two-dimensional geometric model of the wire clamp according to the determined structural parameters; S3. Use the W-M fractal function to simulate the rough surface effect of the preformed wire clamp; S4. Convert the W-M fractal function into a rough surface profile with a hyperbolic linear shape; S5. Use MATLAB to generate the fractal contour curve and export the fractal contour points; S6. Write the fractal contour points into a script program through Python programming, and establish a simulation model of the double-curved rough surface of the preformed wire clamp in finite element software; considering the contact surface of the preformed wire clamp as a double-curved rough surface contact form, which is consistent with the actual contact situation between the preformed wire and the wire, effectively simulating the formation of a non-smooth surface of the wire clamp due to manufacturing, transportation, etc. Therefore, it is very necessary to study the fretting wear of the rough surface.

The invention relates to the technical field of aero-engine design, and provides a surface strengthening treatment method based on coating-free laser shock peening and a nickel-based alloy component, the nickel-based alloy component comprises a component body, and the surface of the component body is provided with a layered microstructure formed through coating-free laser shock peening process treatment; the layered microstructure comprises a remelting layer and a deformation layer which are sequentially stacked from outside to inside; the remelting layer is a layer body formed by melting, cooling and solidifying a surface material of the component body; and the deformation layer is a layer body formed by plastic deformation under the action of shock waves. According to the method, the surface of the nickel-based alloy component is subjected to strengthening treatment by adopting a coating-free laser shock strengthening process, so that the process limitation of a traditional LSP technology in complex molded surface application is broken through, and the applicability is remarkably improved; and a layered microstructure composed of a deformation layer and a remelting layer is formed through induction, generation and expansion of cracks in a fretting contact area are restrained, and the fretting wear resistance and the fretting fatigue resistance of the nickel-based alloy component are enhanced.

A connection system for a lid in a beacon housing. The lid is connected to the housing at a tab at a first end, after a lip of the lid is placed under a shelf at its second end. The tab has a cross-bore for receiving a connection pin through both the cross-bore and corresponding holes in the housing which form a continuous passage. The lid is placed under tension to reduce relative vibration between the lid and the housing. A set screw is placed within the tab to place a force on the connection pin. Further set screws are distributed about the lid and place the lid in tension relative to the housing. The lid can be removed by reducing the tension provided by the set screws, removing the connection pin, and adjusting the lid such that it is no longer under the shelf of the housing.

The application discloses a wear-resistant nanometer gradient composite coating and a magnetron sputtering method thereof, and belongs to the technical field of material surface treatment. The wear-resistant nanometer gradient composite coating is composed of oxide nanoparticles and a soft layer. The soft layer is coated on the outside of the oxide nanoparticles during friction. The oxide nanoparticles gradually decrease from the surface to the center of the coating, and the soft layer gradually increases from the surface to the center of the coating, forming a reverse composite gradient layer. The soft layer and the oxide nanoparticle layer are obtained through the magnetron sputtering method. The soft layer is composed of Ag and Cu soft metals. The oxide nanoparticles are Fe2O3 nanoparticles. The oxide nanoparticles have a bearing effect, and can reduce fretting wear of the material through rolling. The soft metal has a coating and bonding effect on the nanometer oxide particles. The wear-resistant nanometer gradient composite coating and the magnetron sputtering method thereof can solve the problem that the existing wear-resistant nanometer hard coating is easy to peel off, thereby affecting the service life of the coating.

The invention discloses a magnetron sputtering modified biomedical titanium alloy with good friction corrosion resistance and a preparation method and a friction corrosion resistance testing method thereof. The magnetron sputtering modified biomedical titanium alloy comprises a titanium alloy base material and an Nb coating located on the surface of the titanium alloy base material. The preparation method comprises the following steps: pretreating a titanium alloy base material; an Nb metal sheet serves as a target material, the surface of a titanium alloy base material serves as a deposition surface, argon serves as working gas, Nb atoms in the Nb metal sheet are sputtered to the surface of the titanium alloy base material under the action of an electric field, and the Nb coating is formed on the surface of the titanium alloy base material. According to the method, niobium is successfully introduced into the surface of the titanium alloy base material for the first time through the magnetron sputtering technology, the Nb coating which is uniform in distribution and compact in structure is formed, the surface and the interior of the coating are free of damage such as cracks and stripping, and the coating and the base material are well combined. The prepared Nb surface modified biomedical titanium alloy has obviously better microhardness, fretting wear resistance and corrosion resistance.

The present invention relates to an in-situ fretting corrosion fatigue testing machine and method based on synchrotron radiation diffraction and three-dimensional imaging, and belongs to the field of fretting corrosion fatigue testing. The testing machine includes an axial fatigue loading system, a fretting loading system and a corrosion environment control system; the axial fatigue loading system includes a driving device, a load control device, and a load sensing device; the load sensing device is used to measure the axial force and normal force in real time; the driving device is used to drive the load control device to enable the load control device to achieve axial displacement; the load control device is used to perform axial fatigue loading on the sample; the fretting loading system includes a fretting wear device. The testing machine is used to realize the real-time three-dimensional imaging characterization of material wear spots and crack shapes under fretting corrosion environment and the characterization of residual stress evolution law.

This application relates to a manufacturing process for a marine container lashing fork, which pertains to the field of marine containers. The process involves screwing a screw into a threaded hole in a connector; welding the portion of the connector located at the end of the threaded hole to the screw; machining a first insertion hole on the welded connector and a second insertion hole on the screw, the first and second insertion holes together forming an insertion channel communicating with the threaded engagement gap; forming an venting and discharge channel communicating with the threaded engagement gap; placing a filler block into the insertion channel and heating it to melt; inserting a rod into the insertion channel, forcing the molten filler material into the threaded engagement gap; and cooling and solidifying the filler material after it flows out of the venting and discharge channel to form a filler layer. This application can reduce the risk of fretting and loosening within the threaded pair and reduce the risk of corrosion from moisture and salt spray.

The invention provides an anti-fretting wear sectional surface texture design method for a titanium alloy rotor shaft external spline, which comprises the following steps of: calculating to obtain Mises equivalent stress and surface contact stress distribution characteristics of the titanium alloy rotor shaft spline from top to bottom (in the axial direction of an inner shaft and an external spline) and from top to bottom (in the radial direction of the inner shaft and the external spline) in a transmission process; and then the spline is divided into sections from top to bottom and from top to bottom, corresponding surface textures are designed according to the stress characteristics of the divided sections, the surface contact stress uniformity is improved while the local stress concentration phenomenon of the surface of the spline pair is reduced, and the Mises equivalent stress distribution condition of the spline pair is improved. Through the sectional surface texture design, the service reliability of the titanium alloy rotor shaft spline pair is improved, and the service life of the titanium alloy rotor shaft spline pair is prolonged.

The invention discloses a corrosion fretting wear experimental device, which relates to the field of material performance testing, and comprises an experimental platform, an experimental assembly, an environment control box, a gasification assembly and a power assembly, the environment control box is located on the experiment platform and comprises a box body, a controller and a corrosive gas concentration meter, and the controller is in signal connection with all the assemblies and controls operation of the gasification assembly to regulate and control the corrosive gas concentration; the experiment assembly is located in the box body and provides micro-motion for a sample; the gasification assembly is located on one side of the experiment platform and provides corrosive gas for the box body. The power assembly is fixed on the experiment platform and is in transmission connection with the experiment assembly. When a test sample corrosion fretting wear experiment is carried out, a test sample is put into the experiment assembly and put into the box body, the controller controls the power assembly to move the experiment assembly and open the experiment assembly and the gasification assembly to carry out the experiment, the corrosion gas concentration is monitored and the gasification assembly is regulated in the experiment process, and the experiment assembly does not need to be paused; and the synchronous development capability of the fretting wear experiment and the salt spray corrosion experiment is improved.

This invention relates to the field of metal cutting technology, specifically to a method for analyzing the fretting slip wear mechanism of titanium alloy TC4 extreme continuous cutting tools, aiming to solve problems such as severe tool wear and poor machining stability in extreme cutting of this material. The method includes: conducting extreme continuous cutting experiments with AlCrN coated and uncoated carbide end mills; establishing a milling theoretical model and analyzing the cutting forces at each cutting stage; observing tool angle changes and edge wear patterns; using EBSD technology to analyze the workpiece crystal structure and phase changes; and obtaining friction coefficient data through fretting wear experiments. This method systematically reveals the wear patterns of the two types of tools, the fretting slip wear mechanism, and the correlation between workpiece phase transformation and the cutting system, providing a scientific basis for tool selection, structural optimization, and tool change timing determination, achieving efficient, precise, and stable machining of titanium alloy TC4 workpieces, and meeting the needs of high-end fields such as aerospace.

The invention relates to a construction method for a torsional shear type high-strength bolt of a steel structure node, which comprises the following steps of: 1, carrying out a high-strength bolt fastening axial force test and an anti-slip friction surface test, determining a torque coefficient control value, and checking a torque wrench; 2, after bolt joints with different plate thicknesses are treated, the friction face of the steel structural component is cleaned, the steel structural component is temporarily fixed through installation bolts after being hoisted in place, then the installation bolts are replaced with high-strength bolts, initial screwing is conducted, then final screwing is conducted on the high-strength bolts, and finally paint on the connecting face is coated in a supplementary mode; according to the method, fatigue crack propagation caused by stress overrun of the waterproof cloth due to sudden change of the plate thickness is avoided through pre-test verification, and after construction optimization treatment is carried out on bolt nodes with different plate thicknesses and the plate thickness difference is eliminated, friction surface cleaning is carried out, the micro-motion slippage amplitude is reduced, initial screwing and final screwing are carried out, and plate seam gaps are eliminated in stages, so that the reliability of the waterproof cloth is improved. And accurate torque transmission is ensured, so that the fatigue life of the steel structure joint is prolonged.

The invention discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction wear performance test. The device comprises a magnetic field generation module, a magnetic attraction force closed-loop regulation and control system, a friction wear test platform and an atmosphere environment control mechanism, the friction-wear test platform comprises a fretting friction-wear module and a sliding friction-wear module, and the fretting friction-wear module and the sliding friction-wear module are respectively used for performing a fretting friction-wear test and a sliding friction-wear test on the to-be-tested sample; and the atmosphere environment control module is used for controlling the atmosphere environment where the to-be-tested sample is located. The device can solve the technical bottleneck that a traditional device cannot dynamically match a magnetic field and mechanical parameters and lacks multi-mode friction wear test simulation and a controllable atmosphere environment, the reliability and applicability of test data are remarkably improved, and technical support is provided for research of material friction wear behaviors in a complex magnetic field environment.

The utility model discloses a kind of sealed connection structure of long-term tolerance refrigerant, it is related to pipeline connection technical field, it includes first connection flange and second connection flange, annular groove is set up on first connection flange near the center hole, O-shaped sealing ring is arranged in annular groove, wear-resistant corrosion-resistant material layer is compounded on the surface of O-shaped sealing ring, and its height before compression is 0.1-0.2mm higher than annular groove, and the edge of second connection flange is formed with the pressing sealing surface radially protruding from center hole, and the pressing sealing surface covers annular groove and extrudes O-shaped sealing ring to form sealing structure. The utility model is high-pressure sealing reliability, anti-vibration, anti-thermal deformation, anti-refrigerant corrosion;Flow passage optimization reduces flow resistance, reduces compressor power consumption;Ternary ethylene-propylene composite layer and anti-micro-motion wear structure, sealing life is improved.

The invention discloses a clutch driving shaft platform additive repairing method based on a laser cladding technology. The clutch driving shaft platform additive repairing method comprises the steps that a clutch driving shaft and Fe-5 iron-based powder are preheated before welding; fe-5 iron-based powder is used for carrying out laser melting material adding on the abraded position, without machining allowance, of the clutch driving shaft; and after-welding slow cooling and supplementary machining are conducted on the clutch driving shaft obtained after laser melting additive manufacturing, and the clutch driving shaft is repaired. According to the method, material reduction repair is changed into material increase repair, Fe-5 iron-based powder is selected as material increase repair powder, after laser cladding, the surface hardness of the Fe-5 iron-based powder reaches or is superior to that of an original matrix carburizing surface, cladding can be directly carried out on an original clutch driving shaft platform, and the clutch driving shaft which cannot be ground and repaired is recovered to the original technological level; and meanwhile, the wear resistance of the repaired platform is verified through a fretting wear test.

The invention discloses a quality assessment method for an oil-immersed electric contact component, and the method comprises the steps: evaluating the reasonability of the structural design of the electric contact component based on structural parameters and a force-contact resistance mapping relation of the electric contact component; thermal expansion micro displacement of the plug-in structure is simulated, a micro wear test is carried out, and the wear resistance of the electric contact component is examined by combining the contact resistance of the electric contact component and the coating thickness after the test; carrying out a cyclic thermal shock test on the electric contact part, observing whether the plating layer has layering and cracks or not through metallographic phase after the test, and checking the adhesion of the plating layer of the electric contact part; a high-temperature tube furnace test is carried out under the working condition that the electric contact part is pressed, and the high-temperature creep resistance of the electric contact part is evaluated by combining mechanical and metallographic detection; and carrying out an accelerated corrosion test on the electric contact part, and detecting and evaluating the corrosion resistance and the coating density of the electric contact part by adopting SEM-EDS after the test. According to the invention, a systematic and scientific quality assessment method is formed for the electric contact part, and the potential safety hazard of an ultra-high voltage power transmission project can be reduced.

The application discloses a kind of quantitative solution method of wear coefficient based on micro contact stress, it is related to the technical field of fretting wear, for solving the problem that the existing wear coefficient solution cannot reflect the local stress difference in the orthogonal contact area of tube sample and wire sample, resulting in insufficient calibration accuracy of local wear coefficient, by reading the radius and material elastic parameters of tube sample and wire sample to generate elliptical contact basic parameters, the normal load between tube sample and wire sample is combined to determine the elliptical contact area and the position of analysis point, the local contact stress is calculated according to the position of analysis point and the corresponding local wear depth is extracted, the local wear coefficient is calculated point by point combined with total slip distance, and the wear coefficient distribution function in the elliptical contact area is generated.

The present disclosure provides an inductive heating type fretting fatigue test device and method, and relates to the technical field of material performance testing. The device comprises a clamping mechanism for clamping a fretting fatigue test piece and a pad, one end of the pad abutting against the surface of the test piece and transmitting a normal load to the test piece; a loading mechanism connected with the clamping mechanism for loading the test piece; and a heating mechanism comprising multiple groups of inductive coils and heating bodies, the heating mechanism heating the heating bodies by using the inductive coils, and the heating bodies providing a high-temperature environment for the test piece through heat radiation. The fretting fatigue test device and method provided by the present disclosure can prevent the pad from following the test piece during the loading process, prevent the eccentric loading of the fretting fatigue load during the test process, and heat the test piece based on the electromagnetic induction principle, thereby improving the heating efficiency, reducing the space required for the test, and facilitating the observation and analysis of the damage evolution of the fretting fatigue test piece during the test process.