A friction pair micro-damage simulation method, system, device and medium

Abstract

The present invention provides a method, system, equipment and medium for simulating microscopic damage of a friction pair, which relates to the field of friction damage analysis. Aiming at the problem that the friction and wear of tiny abrasive particles of a friction pair of a workpiece on a substrate is currently inconvenient to simulate and obtain, a microscopic molecular dynamics model of the friction pair is established and abrasive wear numerical simulation is performed, the influence of the tribological properties of the abrasive particles on the substrate under different working conditions is analyzed, the microscopic wear mechanism is analyzed, and the tribological properties are obtained to simulate the microscopic damage of the friction pair, thereby guiding the reduction of friction.

Description

Technical Field

[0001] The invention relates to the field of friction damage analysis, and in particular to a method, system, equipment and medium for simulating microscopic damage of a friction pair. Background Art

[0002] Friction of mechanical equipment is inevitable and poses a hidden danger to production efficiency and safety. There are various types of friction and wear between friction pairs of mechanical equipment, and abrasive wear is one of them. However, the friction behavior caused by micro-nano-scale abrasive particles entering the friction pairs cannot be captured by conventional means, which makes it difficult to predict the tribological properties of such friction pairs. For example, in the wear research of bearings, bearings are made of special wear-resistant materials. They help reduce friction, support moving parts, bear loads, lubricate and cool, thereby ensuring the normal operation and life of the engine. In normal working conditions, the crankshaft and bearing are in a state of complete fluid lubrication, and the friction pairs are separated by the generated dynamic pressure lubrication film. However, under working conditions such as engine starting and stopping, the friction pairs of the shaft and bearing may be in a state of boundary lubrication or even dry friction due to insufficient lubricating oil. In this state, abnormal wear such as abrasive wear, scratches and bonding may occur. Once abnormal wear occurs, it is easy to cause burning of bearings, overheating of the crankshaft, deformation, and even cracks, resulting in the scrapping of the substrate or crankshaft. Abrasive wear is one of the common causes of abnormal wear. Impurities in the air, surface processing residues, and crankshaft surface peeling can all produce abrasive particles. For the friction pair of shafts and bearings, iron abrasive particles account for the largest proportion. With existing detection technologies, the generation of abrasive particles in the working state has been detected, and their microscopic size can reach 10-100 microns. However, abrasive particles of smaller scales, such as nanoscale, cannot be detected based on the existing technical level, and such tiny abrasive particles may cause microcracks on the surface of the bearing. During the wear process of shafts and bearings, the generation of surface microcracks is often inevitable and unpredictable. Under fatigue wear, microcracks will gradually accumulate, leading to the generation of sub-surface cracks, causing damage to the bearing.

[0003] The abrasive wear between the shaft and the bearing is mainly affected by the journal speed, the external load of the bearing and the size of the wear particles. At present, it is difficult to simulate the friction and wear mechanism of tiny abrasive particles on the substrate and the causes of surface microcracks under different working conditions through actual workpieces, which makes it inconvenient to analyze the friction and wear mechanism of the workpiece and the causes of surface microcracks, making it difficult to effectively improve the friction and wear resistance of the substrate. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and provide a method, system, equipment and medium for simulating microscopic damage of a friction pair. By establishing a microscopic molecular dynamics model of the friction pair and performing numerical simulation of abrasive wear, the influence of the tribological properties of abrasive particles on the substrate under different working conditions is analyzed, the microscopic wear mechanism is analyzed, and the tribological properties are obtained to simulate the microscopic damage of the friction pair, thereby providing guidance for reducing friction.

[0005] The first object of the present invention is to provide a method for simulating microscopic damage of a friction pair, which adopts the following scheme:

[0006] include:

[0007] Based on the molecular dynamics model of the micro-friction between the abrasive particles and the substrate of the friction pair, the abrasive wear numerical simulation is carried out;

[0008] Adjust the friction pair load, abrasive particle speed and / or abrasive particle size, obtain the displacement and speed of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain the tribological parameters under different working conditions;

[0009] Based on the tribological parameters under different working conditions, the tribological characteristics of the friction pair are obtained, and the microscopic damage of the friction pair is simulated.

[0010] Furthermore, the abrasive wear is analyzed based on molecular dynamics to obtain relevant parameters that affect the friction and wear characteristics, and the molecular dynamics model is established.

[0011] Furthermore, when establishing the analytical dynamics model, the substrate is set as a fixed layer, a constant temperature layer and a Newtonian layer arranged in sequence, and the abrasive is set as a rigid body; a force field is selected to describe the interatomic force, and before the numerical simulation of abrasive wear is performed, the starting point of the simulation is in a state of equilibrium.

[0012] Further, the adjusting of the friction pair load, abrasive particle speed and / or abrasive particle size comprises:

[0013] Adjust the friction pair load and / or abrasive particle speed, establish different working conditions, and analyze the friction process;

[0014] Adjust the friction pair load and / or abrasive particle size, establish different working conditions, and analyze the friction process.

[0015] Further, the adjusting the friction pair load includes: applying a load perpendicular to the plane direction of the substrate to the abrasive particles, so that the abrasive particles are pressed down to the substrate;

[0016] Changing the size of the abrasive particles in the direction perpendicular to the plane of the substrate;

[0017] The adjusting of the abrasive particle speed comprises:

[0018] Give the abrasive a load parallel to the plane of the substrate, so that the abrasive moves relative to the substrate;

[0019] Changing the size of the abrasive in the direction parallel to the plane of the substrate;

[0020] The adjusting of the abrasive grain size includes: changing the size of the abrasive grains acting on the substrate.

[0021] Furthermore, based on the obtained displacement and velocity of the abrasive atoms relative to the substrate atoms and the distribution of the substrate atoms, the motion trajectories of the abrasive atoms and substrate atoms at different times and the substrate wear morphology are analyzed and obtained.

[0022] Furthermore, the tribological parameters include substrate surface morphology, substrate wear, substrate temperature change, friction pair energy change, average friction force of abrasive particles and abrasive particle deflection angle.

[0023] A second object of the present invention is to provide a friction pair microscopic damage simulation system, comprising:

[0024] The numerical simulation module is configured to: perform numerical simulation of abrasive wear based on a molecular dynamics model of micro friction between abrasive particles and a substrate of the friction pair;

[0025] The parameter adjustment module is configured to: adjust the friction pair load, abrasive particle velocity and / or abrasive particle size, obtain the displacement and velocity of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain tribological parameters under different working conditions;

[0026] The output module is configured to obtain the tribological characteristics of the friction pair based on the tribological parameters under different working conditions and simulate the microscopic damage of the friction pair.

[0027] The third object of the present invention is to provide a device comprising a processor and a memory, wherein the memory stores computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the friction pair micro-damage simulation method according to any one of claims 1 to 7.

[0028] The fourth object of the present invention is to provide a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the friction pair micro-damage simulation method as in the first object.

[0029] Compared with the prior art, the present invention has the following advantages and positive effects:

[0030] (1) In order to solve the problem that the friction and wear of tiny abrasive particles on the substrate of the workpiece friction pair is difficult to simulate, a microscopic molecular dynamics model of the friction pair is established and abrasive wear numerical simulation is performed. The influence of the tribological properties of the abrasive particles on the substrate under different working conditions is analyzed, the microscopic wear mechanism is analyzed, and the tribological properties are obtained to simulate the microscopic damage of the friction pair, thereby providing guidance for reducing friction.

[0031] (2) By rationally designing the molecular dynamics model of abrasive particles and substrates, the microscopic mechanism of abrasive wear in the friction pair of mechanical equipment is explained and analyzed from a microscopic perspective, revealing the microscopic damage mechanism and making up for the defects that cannot be observed in macroscopic experiments.

[0032] (3) By taking deflection angle, substrate temperature difference, system energy increment, number of friction atoms and average friction force as friction characteristic parameters, the effects of different constant loads, sliding speeds and small abrasive particle sizes on the friction of mechanical equipment are analyzed, providing multiple improvement directions for guiding the reduction of friction damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 This is the molecular dynamics model of abrasive wear in Examples 1-4 of the present invention.

[0035] Figure 2 Schematic diagram of the specific division of the molecular dynamics model in Examples 1-4 of the present invention.

[0036] Figure 3 Schematic diagram of substrate wear under different loads and different sliding speeds in Examples 1-4 of the present invention.

[0037] Figure 4 The radar diagrams of friction characteristics under different loads and different sliding speeds in Examples 1-4 of the present invention are shown.

[0038] Figure 5 It is a statistical diagram of friction characteristic data under different loads and different sliding speeds in Examples 1-4 of the present invention.

[0039] Figure 6 Schematic diagram of substrate wear under different loads and different abrasive particle sizes in Examples 1-4 of the present invention.

[0040] Figure 7 It is a statistical diagram of friction characteristic data under different loads and different abrasive particle sizes in Examples 1-4 of the present invention. DETAILED DESCRIPTION

[0041] Example 1

[0042] In a typical embodiment of the present invention, Figure 1-Figure 7 As shown in the figure, a method for simulating microscopic damage of friction pairs is given.

[0043] The friction pair micro-damage simulation method provided in this embodiment conducts nanoscale contact friction and wear analysis. Based on the friction and wear mechanism of tiny abrasive particles on the substrate under different working conditions and the causes of surface microcracks, it can improve the anti-friction and anti-wear ability of the bearing substrate. The contact interface formed by tiny abrasive particles and the substrate is a common friction pair in micro-nano systems. Through molecular dynamics simulation of the friction pair of mechanical equipment, the friction damage behavior of tiny abrasive particles on the substrate can be effectively predicted, thereby guiding the reduction of friction.

[0044] Specifically, Figure 1 As shown in Figure 2, the microscopic damage simulation method of the friction pair includes:

[0045] Based on the molecular dynamics model of the micro-friction between the abrasive particles and the substrate of the friction pair, the abrasive wear numerical simulation is carried out;

[0046] Adjust the friction pair load, abrasive particle speed and / or abrasive particle size, obtain the displacement and speed of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain the tribological parameters under different working conditions;

[0047] Based on the tribological parameters under different working conditions, the tribological characteristics of the friction pair are obtained, and the microscopic damage of the friction pair is simulated.

[0048] Among them, the influence of different working conditions on the tribological properties of tiny abrasive particles on the two-dimensional sinusoidal bearing substrate was studied under constant load conditions, especially the microscopic wear mechanism, such as the load, sliding speed, particle size and initial friction position of the tiny abrasive particles. And the tribological properties were evaluated by using the bearing substrate surface morphology, substrate wear, substrate temperature change, friction pair system energy change, average friction force of abrasive particles and abrasive particle deflection angle.

[0049] Specifically, in this embodiment, the microscopic damage simulation method of the friction pair of common mechanical equipment is described by taking the abrasive wear of the crankshaft bearing friction pair as an example. The friction and wear process of the crankshaft bearing friction pair is numerically simulated and analyzed:

[0050] (1) Conduct abrasive wear analysis based on molecular dynamics, analyze the influence of relevant parameters on friction and wear characteristics, and establish a model for molecular dynamics simulation;

[0051] (2) Based on the basic principles of molecular dynamics, a molecular dynamics model of the microscopic friction between abrasive particles and the bearing substrate is established, and a numerical simulation of abrasive wear based on molecular dynamics is performed. By numerically solving the motion equation, the displacement and velocity of abrasive particles atoms relative to the bearing substrate atoms, as well as the distribution of bearing substrate atoms, are obtained, and the motion trajectory of atoms at different times and the substrate wear morphology are obtained;

[0052] (3) Analyze the influence of different working conditions on the tribological characteristics of the friction system under different constant forces and speeds from a microscopic perspective;

[0053] (4) Analyze from a microscopic perspective the effects of different working conditions on the tribological properties of the friction system under different constant forces and particle sizes.

[0054] In the above step (1), the molecular dynamics simulation process includes:

[0055] ① Carry out theoretical modeling for the model to be simulated;

[0056] ② Set system parameters such as atomic type, atomic mass, boundary conditions, and system dimensions.

[0057] ③ Select a suitable potential function to describe the interatomic forces. In this embodiment, EAM potential and LJ potential are used.

[0058] ④ Use computational methods to solve the equations of motion.

[0059] ⑤ All parts of the system are fully relaxed.

[0060] ⑥ Complete the set number of steps of the friction process and obtain the atomic trajectory file.

[0061] ⑦Extract relevant data and analyze and discuss the results.

[0062] In the above step (2), the molecular dynamics model simulation operation steps of the micro friction between the abrasive particles and the bearing base are as follows:

[0063] ①Model establishment.

[0064] In the actual working process of crankshaft bearings, the main source of tiny abrasive particles is iron impurities, and the bearing base is generally made of copper. Therefore, the tiny abrasive particles in the model are composed of iron atoms, and the bearing base is composed of copper atoms.

[0065] In this embodiment, if Figure 2 As shown, the tribological properties are mainly evaluated by observing the changes in various parameters of the substrate. Therefore, the abrasive particles are set as rigid bodies, and the bearing substrate is set as three layers, namely, a fixed layer, a constant temperature layer and a Newtonian layer.

[0066] Among them, the fixed layer plays the role of fixing the substrate to prevent high-speed movement of substrate atoms during friction; the constant temperature layer absorbs the heat generated by the Newtonian layer to prevent the system from overheating and causing system collapse; the Newtonian layer does not impose other constraints on atoms, so that it can fully simulate the actual situation.

[0067] After the model is established, it is necessary to select a suitable force field to describe the interatomic forces. It should be noted that when selecting force field parameters from different sources, the self-consistency between the parameters should be ensured. The EAM potential is used in the model to describe the forces between iron atoms and copper atoms, and the LJ potential is used to describe the forces between iron atoms and copper atoms.

[0068] After the model is established, the initialization parameters need to be set. The parameter setting process can be summarized as follows:

[0069] (a) Select a numerical integration or difference method, including the Verlet algorithm, frog leaping algorithm, etc.

[0070] (b) Selection of numerical integration time step; wherein, the numerical integration time step is selected as 1fs;

[0071] (c) Describe the intermolecular forces, the selection of potential functions, the cutoff radius and the cutoff processing method, etc. Among them, the cutoff radius is selected as 1 nm;

[0072] (d) The simplified processing methods selected when calculating intermolecular forces, such as the nearest neighbor table algorithm, the grid index method, and the parameters related thereto;

[0073] (e) calibration of the simulation system ensemble and the algorithm for calculating the statistical ensemble when the state variables N, P, and T are realized;

[0074] (f) Simulation process parameters, including relaxation and number of simulation steps.

[0075] ②Energy minimization. Molecular dynamics simulation can only obtain a small segment of the system phase trajectory. In order to ensure that this small segment of the trajectory obtained by molecular dynamics simulation is representative in the phase space and the simulated data is reliable, the starting point of the simulation must be close to the equilibrium state. In the crystal system, it is necessary to ensure that the initial configuration is near the equilibrium configuration. Therefore, the system structure can be optimized, the system potential energy can be reduced, and the normal simulation process can be ensured. The conjugate gradient method was used, and the tolerance of energy and force errors was set to 1×10 –15 , the maximum number of calculation steps is 5000.

[0076] ③ System relaxation. After the system is initialized, it cannot be completely guaranteed that the system reaches equilibrium. This requires a relaxation process for the system, that is, to make the system reach a stable equilibrium state without external force. That is, before the molecular dynamics simulation, let the system calculate several steps by itself. When the system output energy and temperature parameters reach a stable state, the system can be considered to be in equilibrium, and the time for calculating this process is called relaxation time. The Berendsen temperature control method is used to control the temperature of the isothermal layer to about 300K. Under the canonical system (NVT, with a certain number of ions, volume and temperature), the system relaxes for 30ps to obtain a stable state.

[0077] ④ Determination of the time integration step. The general principle for the integration step in molecular dynamics simulation is that the simulation integration step should be less than one tenth of the fastest motion cycle of the system. In order to reduce the simulation time, the step size is selected as 1fs, which can improve the calculation efficiency and obtain effective analysis data.

[0078] ⑤ Selection of molecular dynamics related parameters. In order to explore the influence of different working conditions on the tribological characteristics of the system, different constant loads, abrasive speeds and abrasive particle sizes were used for comparative simulation. The constant loads were 3nN, 10nN, 20nN, and 30nN respectively; the sliding speeds were 0.1nm / ns, 0.3nm / ns, 0.6nm / ns, and 1.0nm / ns respectively; the particle sizes were 3nm, 4nm, 5nm, and 6nm respectively; the simulation system used periodic boundary conditions in the x and y directions, and non-periodic boundary conditions in the z direction. The friction time was set to 100ps.

[0079] In this embodiment, by rationally designing the molecular dynamics model of abrasive particles and substrates, the microscopic mechanism of abrasive wear in the friction pair of mechanical equipment is explained and analyzed from a microscopic perspective, revealing the microscopic damage mechanism and making up for the defects that cannot be observed in macroscopic experiments.

[0080] The proposed constant load condition can better fit the actual wear conditions of mechanical equipment friction pairs, making the results more practical and instructive. By using deflection angle, substrate temperature difference, system energy increment, number of friction atoms and average friction force as friction characteristic parameters, the influence of different constant loads, sliding speeds and small abrasive particle sizes on the friction of mechanical equipment is analyzed.

[0081] Based on the above friction pair micro-damage simulation method, the following friction mitigation strategies are obtained:

[0082] ① Avoid high-speed operation in the initial stage before the lubricating oil film is formed. Under high-speed conditions, the sharp drop in the deflection angle of tiny abrasive particles and the effect of local thermal stress increase the possibility of tiny cracks on the substrate surface.

[0083] ② When the mechanical equipment is working, try to avoid high load on the substrate surface. Under high pressure conditions, the increased plowing depth of the tiny abrasive particles and the increase in local stress in the direction of travel will produce more tiny cracks and damage.

[0084] ③ Within a certain range, the surface roughness of the bearing can reduce friction, so the surface processing of the actual mechanical equipment does not need to be too smooth. The smaller the surface roughness, the lower the tendency of the abrasive particles to move along the grooves, and the greater the degree of damage to the substrate surface by the tiny abrasive particles, thus generating more tiny cracks.

[0085] In this embodiment, LAMMPS software was used for MD simulation. Before the simulation, various parameters were specified, such as boundary conditions, time step, potential, and ensemble. To reduce the influence of boundary effects, the X and Y directions were set as periodic boundary conditions, and the Z direction was set as non-periodic fixed boundary conditions; based on experience, the calculation time step of the metal model system was 0.001ps;

[0086] The interaction force between atoms is described by the empirical potential function: the tiny abrasive particles composed of cast iron are the rigid layer, and the interaction force between the iron atoms inside is ignored; the copper atoms (Cu-Cu) inside the bearing matrix are described by the cu_u3.eam potential in the Embedded AtomMethod (EAM) potential, and its expression is:

[0087]

[0088] In the formula, E tot represents the total potential energy of the system, represents the interaction potential between atoms i and j, r ij represents the distance between atoms i and j, F(ρ i ) represents the embedding density of atom i as ρ i The embedding energy of the electron cloud, ρ i It represents the electron cloud density at atom i, which is the superposition of all other electron cloud densities in the system at atom i.

[0089] The interaction between tiny wear particles and bearing substrate atoms (Fe-Cu) is described using the Lennard–Jones (L–J) potential, and its parameters are calculated using the Lorentz–Berthellow rule, which is expressed as:

[0090]

[0091] Where ε is the depth of the potential well, σ is the distance at which the interaction between atoms is equal to zero, and the subscripts i and j represent different atoms. The corresponding parameters ε and σ can be obtained by looking up the table according to the prior art. In addition, the cutoff distance of unbounded interactions.

[0092] Specifically, the molecular dynamics simulation process is divided into the following steps:

[0093] ① Energy minimization. The model was optimized by energy minimization to eliminate any excessive local stress. For this purpose, the conjugate gradient method was used, and the tolerance of energy and force errors was set to 1×10 –15 , the maximum number of calculation steps is 5000;

[0094] ② Relaxation. The rigid layer and tiny abrasive atoms are set as rigid bodies, and the temperature of the isothermal layer is controlled to about 300K using the Berendsen temperature control method. Under the canonical system (NVT, with a certain number of ions, volume and temperature), the system relaxes for 30ps to obtain a stable state;

[0095] ③ Press down the tiny abrasive particles. The same simulation conditions as the previous step, apply a load (3nN, 10nN, 20nN, 30nN) in the negative z direction to the bearing base, and last for 100ps during the loading process to achieve a stable position of the tiny abrasive particles in the z direction on the base. Then extract the y-direction deflection speed of 40ps-100ps, calculate the average of its absolute value, and use this speed as the deflection speed of the tiny abrasive particles.

[0096] ④ Friction between tiny abrasive particles and bearing base. The constant load in the z direction of the tiny abrasive particles remains unchanged, and the force in the y direction is not affected. At the same time, a constant speed in the x direction (0.1m / s, 0.3m / s, 0.6m / s, 1m / s) is given to the tiny abrasive particles to slide 10nm along the x direction. During the simulation, the particle size of the tiny abrasive particles (3nm, 4nm, 5nm, 6nm) is also changed to perform friction simulation.

[0097] Specifically, the molecular dynamics analysis steps are as follows:

[0098] ①Analyze the friction process of the system under different constant loads and sliding speeds. The constant loads are 3nN, 10nN, 20nN, and 30nN, and the sliding speeds are 0.1m / s, 0.3m / s, 0.6m / s, and 1m / s. Figure 3 The worn substrate morphology is shown in Figure 2, and the Figure 4 The friction characteristics radar diagram and Figure 5 The friction characteristics statistical group diagram shown.

[0099] ②Analyze the friction process of the system under different constant loads and abrasive particle sizes. The constant loads are 3nN, 10nN, 20nN, and 30nN, and the particle sizes of the tiny abrasive particles are 3nm, 4nm, 5nm, and 6nm. Figure 6 The worn substrate morphology shown in the figure and Figure 7 The friction characteristics statistical group diagram shown.

[0100] Example 2

[0101] In another typical embodiment of the present invention, Figure 1-Figure 7 As shown, a friction pair micro-damage simulation system is given.

[0102] A friction pair microscopic damage simulation system comprises:

[0103] The numerical simulation module is configured to: perform numerical simulation of abrasive wear based on a molecular dynamics model of micro friction between abrasive particles and a substrate of the friction pair;

[0104] The parameter adjustment module is configured to: adjust the friction pair load, abrasive particle velocity and / or abrasive particle size, obtain the displacement and velocity of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain tribological parameters under different working conditions;

[0105] The output module is configured to obtain the tribological characteristics of the friction pair based on the tribological parameters under different working conditions and simulate the microscopic damage of the friction pair.

[0106] The working process of the friction pair micro-damage simulation system can be found in Example 1 and will not be described in detail here.

[0107] Example 3

[0108] In another embodiment of the present invention, Figure 1-Figure 7 As shown, an electronic device is provided.

[0109] The electronic device is used to implement the friction pair micro-damage simulation method in the above embodiment 1, and the electronic device includes one or more processors, one or more memories coupled to the processors, and a communication module coupled to the processors.

[0110] The memory may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, at least one of the following: read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, hard disk, compact disc (CD), digital video disc (DVD) or other magnetic storage and / or optical storage. Examples of volatile memories include, but are not limited to, at least one of the following: random access memory (RAM), or other volatile memories that do not last during the power-off duration. The computer program may be stored in the ROM. The processor implements the above-mentioned friction pair micro-damage simulation method when executing the computer program.

[0111] Example 4

[0112] In another embodiment of the present invention, Figure 1-Figure 7 As shown, a computer-readable storage medium is provided.

[0113] The program may be tangibly contained in a computer-readable medium, which may be included in a device (such as in a memory) or other storage device accessible by the device. The program may be loaded from the computer-readable medium to the RAM for execution. The computer-readable medium may include any type of tangible non-volatile memory, such as ROM, EPROM, flash memory, hard disk, and the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the friction pair micro-damage simulation method as in Example 1.

[0114] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a server or terminal, the process or function described in the embodiment of the present application is generated in whole or in part. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a server or terminal or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (such as a floppy disk, a hard disk and a tape, etc.), an optical medium (such as a digital video disk (digital video disk, DVD), etc.), or a semiconductor medium (such as a solid-state hard disk, etc.).

[0115] In addition, although each operation is described in a specific order, this should be understood as requiring such operation to be performed in the specific order shown or in a sequential order, or requiring that all illustrated operations should be performed to obtain desired results. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation can also be implemented in multiple implementations individually or in any suitable sub-combination mode.

[0116] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A method for simulating microscopic damage of a friction pair, characterized in that: include: Based on the molecular dynamics model of the micro-friction between the abrasive particles and the substrate of the friction pair, the abrasive wear numerical simulation is carried out; Adjust the friction pair load, abrasive particle speed and / or abrasive particle size, obtain the displacement and speed of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain the tribological parameters under different working conditions; Based on the tribological parameters under different working conditions, the tribological characteristics of the friction pair are obtained, and the microscopic damage of the friction pair is simulated; The friction pair load adjustment includes: applying a load perpendicular to the plane of the substrate to the abrasive particles, so that the abrasive particles are pressed down to the substrate; changing the size of the abrasive particles in the direction perpendicular to the plane of the substrate; specifically: applying a load along the negative z direction to the abrasive particles to press down to the substrate for a certain period of time, extracting the deflection velocity in the y direction, calculating the average value of the absolute value, and taking the average value as the deflection velocity of the abrasive particles; wherein the substrate is a two-dimensional sinusoidal bearing substrate; The adjusting of the abrasive particle speed includes: applying a load parallel to the plane of the substrate to the abrasive particles so that the abrasive particles move relative to the substrate; changing the size of the abrasive particles in the direction parallel to the plane of the substrate; specifically, the abrasive particles rub against the substrate, the abrasive particles have a constant load in the z direction unchanged, the force in the y direction is not affected, and at the same time, the abrasive particles are given a constant speed in the x direction to slide along the x direction; The adjusting the abrasive particle size comprises: changing the size of the abrasive particles acting on the substrate; The abrasive grains are composed of iron atoms, and the base is composed of copper atoms.

2. The friction pair micro-damage simulation method according to claim 1, characterized in that: Abrasive wear is analyzed based on molecular dynamics, relevant parameters that affect friction and wear characteristics are obtained, and the molecular dynamics model is established.

3. The friction pair micro-damage simulation method according to claim 2, characterized in that: When establishing the analytical dynamics model, the substrate is set as a fixed layer, a constant temperature layer and a Newtonian layer arranged in sequence, and the abrasive particles are set as rigid bodies. A force field is selected to describe the interatomic forces, and before performing the numerical simulation of abrasive wear, the starting point of the simulation is in a state of equilibrium.

4. The friction pair micro-damage simulation method according to claim 1, characterized in that: The adjusting of the friction pair load, abrasive particle speed and / or abrasive particle size comprises: Adjust the friction pair load and / or abrasive particle speed, establish different working conditions, and analyze the friction process; Adjust the friction pair load and / or abrasive particle size, establish different working conditions, and analyze the friction process.

5. The friction pair micro-damage simulation method according to claim 1, characterized in that: Based on the obtained displacement and velocity of the abrasive atoms relative to the substrate atoms and the distribution of the substrate atoms, the motion trajectories of the abrasive atoms and substrate atoms at different times and the substrate wear morphology are analyzed and obtained.

6. The friction pair micro-damage simulation method according to claim 5, characterized in that: The tribological parameters include substrate surface morphology, substrate wear, substrate temperature change, friction pair energy change, average friction force of abrasive particles and abrasive particle deflection angle.

7. A friction pair micro damage simulation system, characterized in that: include: The numerical simulation module is configured to: perform numerical simulation of abrasive wear based on a molecular dynamics model of microscopic friction between abrasive particles and a substrate of the friction pair; the abrasive particles are composed of iron atoms, and the substrate is composed of copper atoms; The parameter adjustment module is configured to: adjust the friction pair load, abrasive particle velocity and / or abrasive particle size, obtain the displacement and velocity of abrasive particle atoms relative to substrate atoms and the distribution of substrate atoms through numerical simulation, and obtain tribological parameters under different working conditions; The friction pair load adjustment includes: applying a load perpendicular to the plane of the substrate to the abrasive particles, so that the abrasive particles are pressed down to the substrate; changing the size of the abrasive particles in the direction perpendicular to the plane of the substrate; specifically: applying a load along the negative z direction to the abrasive particles to press down to the substrate for a certain period of time, extracting the deflection velocity in the y direction, calculating the average value of the absolute value, and taking the average value as the deflection velocity of the abrasive particles; wherein the substrate is a two-dimensional sinusoidal bearing substrate; The adjusting of the abrasive particle speed includes: applying a load parallel to the plane of the substrate to the abrasive particles so that the abrasive particles move relative to the substrate; changing the size of the abrasive particles in the direction parallel to the plane of the substrate; specifically, the abrasive particles rub against the substrate, the abrasive particles have a constant load in the z direction unchanged, the force in the y direction is not affected, and at the same time, the abrasive particles are given a constant speed in the x direction to slide along the x direction; The adjusting of the abrasive particle size includes: changing the size of the abrasive particles acting on the substrate; the output module is configured to: obtain the tribological characteristics of the friction pair based on the tribological parameters under different working conditions, and simulate the microscopic damage of the friction pair.

8. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory stores computer instructions. When the computer instructions are executed by the processor, the electronic device executes the friction pair micro-damage simulation method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the friction pair micro-damage simulation method according to any one of claims 1 to 6.

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