阅读说明：本技术 一种基于abaqus的颗粒增强钛基复合材料车削过程仿真方法 (ABAQUS-based particle-reinforced titanium-based composite material turning process simulation method ) 是由 宦海祥 濮建飞 霍福松 张可 徐文强 叶香晨 赵正彩 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种基于ABAQUS的颗粒增强钛基复合材料切削过程仿真方法,包括建立钛基复合材料切削过程的仿真模型,将经过处理的仿真模型提交至ABAQUS仿真软件的求解器中进行求解运算,得到运算结果,在ABAQUS仿真软件的后处理模块中查看切削力、应力-应变、材料破损,结合实验及实际切削,对运算结果进行分析和评价。本发明的本发明的仿真方法不同于实验的复杂、繁琐,操作简单,只需在软件中改变数值重新计算,计算结果准确性高,而且该软件使用方便,易掌握,进而可以减少真实车削颗粒增强钛基复合材料的实验次数,为工艺参数的选择提供一份简便的方法,加快加工工艺的优化进程。(The invention discloses a simulation method of a cutting process of a particle-reinforced titanium-based composite material based on ABAQUS, which comprises the steps of establishing a simulation model of the cutting process of the titanium-based composite material, submitting the processed simulation model to a solver of ABAQUS simulation software for solving operation to obtain an operation result, checking cutting force, stress-strain and material damage in a post-processing module of the ABAQUS simulation software, and analyzing and evaluating the operation result by combining experiments and actual cutting. The simulation method of the invention is different from the complex and tedious experiment, has simple operation, only needs to change the numerical value in the software for recalculation, has high accuracy of the calculation result, is convenient to use and easy to master, can further reduce the experiment times of actually turning the particle reinforced titanium-based composite material, provides a simple and convenient method for selecting the process parameters, and accelerates the optimization process of the processing technology.)

1. A simulation method of a cutting process of a particle-reinforced titanium-based composite material based on ABAQUS is characterized by comprising the following steps:

step S1, establishing a simulation model of the cutting process of the particle reinforced titanium-based composite material: the simulation model comprises a cutter model and a particle reinforced titanium-based composite material model, and the particle reinforced titanium-based composite material model comprises a matrix model and a reinforced phase particle model;

step S2, defining material attributes of the established cutter model, matrix model and particle model through ABAQUS simulation software;

step S3, respectively carrying out meshing on the established cutter model, matrix model and particle model through ABAQUS simulation software;

step S4, assembling and positioning the matrix model, the particle model and the cutter model which are divided into grids;

step S5, setting the constraint between the matrix model and the particle model and the constraint between the matrix model and the cutter model;

step S6, establishing analysis steps and output variables according to the cutting motion characteristics;

step S7, setting boundary conditions and applying loads according to the motion characteristics of the tool model relative to the base model;

and S8, submitting the simulation model of the cutting process of the particle reinforced titanium-based composite material processed in the steps S1-S7 to a solver of ABAQUS simulation software for solving operation to obtain an operation result.

2. The ABAQUS-based particle-reinforced titanium-based composite material cutting process simulation method of claim 1, wherein the step S8 is followed by further comprising:

step S9, comparing the obtained operation result with the actual result, and if the simulation is not converged, executing step S1-step S8 again; and if the simulation is larger than the difference threshold, re-executing the steps S4-S8.

3. The ABAQUS-based particle-reinforced titanium-based composite material cutting process simulation method of claim 1, wherein the step S5 is specifically comprised of:

and binding a matrix model and a particle model in the particle reinforced titanium-based composite material model, and defining the friction and the beam between the matrix model and the cutter model of the well-bound particle reinforced titanium-based composite material model according to the contact state between the matrix model and the cutter model.

4. The ABAQUS-based particle-reinforced titanium-based composite material cutting process simulation method of claim 1, wherein the step S6 comprises:

s61, applying a fully-constrained boundary condition to the matrix model;

s62, controlling the movement of the cutter model, applying speed constraint in the x-axis direction of the cutter model, and defining the cutting force in the turning process in historical variables; displacement, velocity, acceleration, stress, strain are defined in the field variables.

5. The ABAQUS-based particle-enhanced titanium-based composite material cutting process simulation method of claim 1, wherein the material properties defined for the substrate model and the tool model in step S2 are defined by a Property module in ABAQUS simulation software.

6. The ABAQUS-based particle-reinforced titanium-based composite material cutting process simulation method of claim 1,

in step S4, assembling the matrix model and the grain model into a workpiece-shaped grain-reinforced titanium-based composite model by an Assembly module in the ABAQUS simulation software;

in step S5, the constraint between the matrix model and the grain model is bound through an Interaction module in the ABAQUS simulation software.

7. The ABAQUS-based particle-reinforced titanium-based composite material cutting process simulation method of claim 1, wherein the area where the tool model and the base model are in contact in step S3 is a fine mesh and the area at a remote distance is a coarse mesh.

Technical Field

The invention relates to the field of machining, in particular to a turning process simulation method of a particle-reinforced titanium-based composite material based on ABAQUS.

Background

The titanium-based composite material is a metal-based composite material which takes titanium alloy as a matrix and is added with whiskers, particles or continuous fiber reinforced phases such as titanium carbide, titanium boride, aluminum oxide, aluminum nitride and the like. Compared with a titanium alloy matrix, the titanium-based composite material has the outstanding advantages of light weight, high specific strength, good oxidation resistance, high temperature resistance, wear resistance, creep resistance, radiation resistance and the like. Compared with the traditional titanium alloy, the titanium-based composite material can meet the special requirements in complex environments, and has extremely high development prospects in the fields of aerospace, electronic information, semiconductor illumination, transportation and the like.

The titanium-based composite material is a typical difficult-to-process material, and the reinforcing phase in the matrix has ultrahigh hardness and strength and good high-temperature performance. During cutting, the reinforcing particles can have serious plowing, scratching and other effects on the cutter, the service life of the cutter is shortened, the processing quality of the surface of the substrate is affected, and the processing cost is high. Therefore, achieving efficient, high quality processing of titanium-based composites becomes a key to the application of such metal-based composites.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a particle reinforced titanium-based composite material cutting process simulation method based on ABAQUS, the defects of a turning experiment are effectively overcome through a simulation research method, finite element simulation not only can intuitively and vividly present the contact interface characteristics of a cutter and the particle reinforced titanium-based composite material in the turning process, but also can conveniently acquire cutting force in the turning process in real time, the whole cutting processing process can be predicted, and the method has important significance for optimizing cutting process parameters, developing equipment and researching special cutters in the turning process of the particle reinforced titanium-based composite material.

The technical scheme is as follows: a simulation method of a cutting process of a particle-reinforced titanium-based composite material based on ABAQUS comprises the following steps:

step S1, establishing a simulation model of the cutting process of the particle reinforced titanium-based composite material: the simulation model comprises a cutter model and a particle reinforced titanium-based composite material model, and the particle reinforced titanium-based composite material model comprises a matrix model and a reinforced phase particle model;

step S2, defining material attributes of the established cutter model, matrix model and particle model through ABAQUS simulation software;

step S3, respectively carrying out meshing on the established cutter model, matrix model and particle model through ABAQUS simulation software;

step S4, assembling and positioning the matrix model, the particle model and the cutter model which are divided into grids;

step S5, setting the constraint between the matrix model and the particle model and the constraint between the matrix model and the cutter model;

step S6, establishing analysis steps and output variables according to the cutting motion characteristics;

step S7, setting boundary conditions and applying loads according to the motion characteristics of the tool model relative to the base model;

and S8, submitting the simulation model of the cutting process of the particle reinforced titanium-based composite material processed in the steps S1-S7 to a solver of ABAQUS simulation software for solving operation to obtain an operation result.

Further, after the step S8, the method further includes:

step S9, comparing the obtained operation result with the actual result, and if the simulation is not converged, executing step S1-step S8 again; and if the simulation is larger than the difference threshold, re-executing the steps S4-S8.

Further, the specific content of step S5 is:

and binding a matrix model and a particle model in the particle reinforced titanium-based composite material model, and defining the friction and the beam between the matrix model and the cutter model of the well-bound particle reinforced titanium-based composite material model according to the contact state between the matrix model and the cutter model.

Further, the step S6 includes:

s61, applying a fully-constrained boundary condition to the matrix model;

s62, controlling the movement of the cutter model, applying speed constraint in the x-axis direction of the cutter model, and defining the cutting force in the turning process in historical variables; displacement, velocity, acceleration, stress, strain are defined in the field variables.

Further, the defining of the material properties for the base model and the tool model in step S2 is defined by a Property module in the ABAQUS simulation software.

Further, in the step S4, assembling the matrix model and the grain model into the workpiece-shaped grain-reinforced titanium-based composite material model is assembled by an Assembly module in the ABAQUS simulation software;

in step S5, the constraint between the matrix model and the grain model is bound through an Interaction module in the ABAQUS simulation software.

Further, in step S3, the area where the tool model and the base model contact each other is a fine mesh, and the area at a distance is a coarse mesh.

Has the advantages that:

1) in the prior art, when the particle reinforced titanium-based composite material is turned, the cutting parameters have great influence on the cutting effect; the cutting parameters are different, the cutting force generated in the cutting process, the breakage of materials and the like can be changed, and when the turning research of the particle reinforced titanium-based composite material is carried out, the experiment is complex and tedious and the cost is high;

the simulation method of the invention is different from the complex and fussy experiment, has simple operation, only needs to change the numerical value in the software for recalculation, has high accuracy of the calculation result, and has convenient use and easy mastering of the software. Furthermore, the experiment times of actually turning the particle reinforced titanium-based composite material can be reduced, the time and the cost are saved, the cutting force in the cutting process, the microscopic damage morphology of the material and the like are quickly and accurately obtained, a simple method is provided for selecting process parameters, and the optimization process of the machining process is accelerated;

2) the invention uses ABAQUS finite element analysis software, takes the actual turning of the particle reinforced titanium-based composite material by the cutter as the basis, carries out simulation on the turning process of the particle reinforced titanium-based composite material, has vivid, visual, accurate and high credibility simulation result, can obtain data which is difficult to obtain in the experiment, can predict the whole processing process and has high guiding value for practice.

3) The method of the invention can be popularized to other composite materials, and finite element analysis can be carried out on the materials by using other simulation software according to a similar method.

Drawings

FIG. 1 is a flow chart of a simulation method of the present invention;

FIG. 2 is a schematic view of a tool model and a simulation model of a particulate reinforced titanium-based composite material according to the present invention;

FIG. 3 is a schematic view of a simulation model of the present invention after assigning material properties, meshing, assembling, constraining, and setting boundary conditions to a tool and a particulate reinforced titanium-based composite;

reference numbers in the figures: 1. a matrix model; 2. a particle model; 3. and (4) modeling a tool.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The invention aims to provide a turning process simulation method of an ABAQUS-based reinforced titanium-based composite material, aiming at the defects of the prior art.

The embodiment provides a turning process simulation method of an ABAQUS-based reinforced titanium-based composite material, as shown in FIG. 1, comprising the following steps:

s1, establishing a simulation model of the turning process of the reinforced titanium-based composite material; wherein the simulation model comprises an enhanced titanium matrix composite matrix model, an enhanced phase particle model and a cutter model;

step S2, defining material attributes of the established matrix model, the established particle model and the established cutter model through ABAQUS simulation software;

step S3, respectively carrying out grid division on the established matrix model, the established particle model and the established cutter model through ABAQUS simulation software;

step S4, assembling and positioning the matrix model, the particle model and the cutter model which are divided into grids;

step S5, setting the constraint between the matrix model and the particle model and the constraint between the matrix model and the cutter model;

step S6, establishing analysis steps and output variables according to the turning motion characteristics;

step S7, setting boundary conditions and applying loads according to the motion characteristics of the tool model relative to the base model;

step S8, submitting the simulation model of the cutting process of the particle reinforced titanium-based composite material processed in the steps S1-S7 to a solver of ABAQUS simulation software for solving operation to obtain an operation result; and (3) checking cutting force, stress-strain and material damage in a post-processing module of ABAQUS simulation software, and analyzing and evaluating an operation result by combining experiments and actual cutting.

Step S9, comparing the obtained operation result with the actual result, and if the simulation is not converged, executing steps S1-S8 again; if the simulation is greater than the difference threshold, steps S4-S8 are re-executed.

In this embodiment, ABAQUS is a powerful finite element software for engineering simulation, and the problem solving range from relatively simple linear analysis to many complex non-linear problems. ABAQUS includes a rich library of cells that can simulate arbitrary geometries. The ABAQUS can not only solve a large number of structural (stress/displacement) problems, but also simulate a plurality of problems in other engineering fields, such as heat conduction, mass diffusion, thermoelectric coupling analysis, acoustic analysis, geomechanical analysis (fluid permeation/stress coupling analysis) and piezoelectric medium analysis.

The ABAQUS comprises a Part function module, a Property function module, an Assembly function module, a Step analysis Step function module, an Interaction function module, a Load function module, a Mesh grid function module, a Job analysis operation function module, a Sketch drawing function module and a Visualization post-processing function module.

In this embodiment, a homogeneous mesh partition method is adopted in the simulation. In the turning process, the particle reinforced titanium-based composite material model is clamped on a machine tool through a clamp, the bottom surface of the particle reinforced titanium-based composite material model can be regarded as completely fixed, and a fully-constrained boundary condition is applied to the bottom surface of the particle reinforced titanium-based composite material model during finite element simulation.

The ABAQUS software is used for simulating the turning process of the particle reinforced titanium-based composite material by the cutter, the shape of the cutter is fixed in the turning process of the particle reinforced titanium-based composite material, the heat load change is small, and the cutting processing parameters are easy to control in simulation, so that the material constitutive relation, the hard particle fracture mode and the friction characteristic between the cutter and the particle reinforced titanium-based composite material are mainly considered in the turning simulation modeling of the particle reinforced titanium-based composite material. The method of the invention can be popularized to other composite materials, and finite element analysis can be carried out on the materials by using other simulation software according to a similar method.

In step S1, a simulation model of the turning process of the particle-reinforced titanium-based composite material is established as shown in FIG. 2; the simulation model comprises a particle-reinforced titanium-based composite material model and a cutter model 3, the particle-reinforced titanium-based composite material model comprises a matrix model 1 and a reinforced phase particle model 2, and the relevant size of the cutter is modeled according to the size of the cutter actually produced.

In this embodiment, the two-dimensional models of the substrate, the granules and the tool can be built directly in the ABAQUS, or can be built in other modeling software and then introduced into the ABAQUS. The present example selects modeling directly in ABAQUS, with μm as the unit for length, and is followed by sibling dimensions.

The reinforcing phase particles selected in the embodiment are titanium carbide (TiC) particles, the melting point is 3140 ℃, the boiling point is 4820 ℃, the relative density is 4.93, the hardness is 9-10, the gray metallic luster crystalline solid is hard, the hardness is second to diamond, the magnetism is weak, the reinforcing phase particles are important components of hard alloy, can be used as metal ceramics, can also be used for manufacturing cutting tools, and have the characteristics of high hardness, corrosion resistance and good thermal stability.

In step S2, material properties are defined for the created matrix model, grain model and tool model, respectively, by ABAQUS simulation software.

After the two-dimensional models of the cutter, the matrix and the particles are established, material attributes of the two-dimensional models of the cutter, the matrix and the particles need to be defined in a Property function module of ABAQUS simulation software respectively, so that simulation analysis of physical quantities can be performed.

In this embodiment, the particles are numerous and random, so that single particle simulation can be performed and the particle and matrix shapes are simplified, which simplifies the simulation. The tool was a PCD diamond tool, taking into account the properties of the particle reinforced titanium matrix composite and the performance of the tool. In this embodiment, the performance parameters of the substrate material selected for the substrate model, the particulate material selected for the particulate model, and the tool material selected for the tool model are shown in table 1:

TABLE 1 Property parameters of base and particle materials and tool materials

The relation among stress, strain and temperature in the material deformation process is described by depending on a material constitutive model, and meanwhile, the material constitutive model indirectly reflects the mechanical property of the material. The correct choice of material constitutive model is a key factor in the finite element simulation. At present, due to the fact that the Johnson-Cook (J-C for short) material constitutive model comprehensively considers the influences of strain strengthening, strain rate strengthening and thermal softening effects on the material, the Johnson-Cook material constitutive model is widely applied to the research of the metal material cutting simulation process. Therefore, the stress-strain relationship of the PTMC base material Ti-6Al-4V titanium alloy is described by adopting a J-C material constitutive model in the model, and the equation is as follows:

wherein σ and ε are flow stress and strain;

a is the quasi-static yield strength of the material at room temperature;

b and n are material strain strengthening action constants;

c is a strain rate strengthening action constant;

tr is the temperature of the room temperature,

tm is the melting point of the material,

and m is the heat softening action constant of the material.

The parameters of the J-C constitutive model of the matrix material Ti-6Al-4V titanium alloy are shown in Table 2;

TABLE 2J-C constitutive model parameters for Ti-6Al-4V titanium alloys

A/MPa	B/MPa	C	n	m	Tm/℃	Tr/℃
							875	793	0.01	0.386	0.71	1560	20

In step S3, the created matrix model, the created grain model, and the created tool model are respectively gridded by ABAQUS simulation software.

The mesh division is the most important step in the finite element analysis, and the mesh density, the mesh type and the mesh division skill directly determine the success or failure of the finite element simulation and influence the simulation precision and the simulation efficiency.

In this embodiment, the area where the tool model and the base model are in contact is a fine mesh and the area at a remote distance is a coarse mesh, as shown in fig. 3.

In step S4, the matrix model, the grain model, and the tool model that have been divided into meshes are assembled and positioned.

The matrix model and the granular component model were assembled into a workpiece-shaped granular reinforced titanium matrix composite model by Assembly module in the ABAQUS simulation software.

In step S5, constraints of the matrix model and the particle model and constraints between the matrix model and the tool model are set.

The assembled particle reinforced titanium-based composite material model structure in the Assembly functional module is only a model structure in a spatial sense, and the matrix model and the particle model are isolated and need to be bound in the Interaction functional module. After the matrix model and the particle model in the particle reinforced titanium-based composite material model are bound, friction and constraint between the matrix model and the particle model are defined according to the contact characteristics between the matrix material and the cutter. Because the method aims at the abrasion and deformation of the particle reinforced titanium-based composite material instead of the cutter, the cutter is set to be a rigid body, so that the analysis and calculation time can be reduced, and the accuracy of the calculation result can be improved.

In the embodiment, in the cutting process, if the deformation of the cutter is small, a cutter reference point is set and rigid constraint is applied to the cutter; binding the contact surfaces of the particle model and the matrix model which are contacted with each other to form the particle reinforced titanium-based composite material in the true sense. According to the contact state between the cutter and the particle-reinforced titanium-based composite material after the cutter cuts off the particle-reinforced titanium-based composite material, the Coulomb friction law is applied to define the friction characteristic between the cutter and the particle-reinforced titanium-based composite material, and the friction coefficient f is 0.2.

In step S6, analysis step and output variables are created from the turning motion characteristics.

And selecting a display dynamic analysis step according to the turning motion characteristics, defining the cutting force in the turning process in historical variables, and defining displacement, speed, acceleration, stress, strain and the like in field variables.

In this embodiment, the process of creating the analysis step and the output variable is as follows:

step S6.1, initial analysis step: applying a fully constrained boundary condition of the bottom surface to the matrix model;

step S6.2, the first analysis step: controlling the tool motion, as shown in FIG. 3, with the X direction imposing a velocity constraint; in addition, the cutting force in the turning process is defined in the historical variable, and the output of the historical variable only needs to be directed at the tool reference point; displacement, velocity, acceleration, stress, strain, etc. are defined in the field variables, and the output of the field variables is for the entire two-dimensional model.

In step S7, boundary conditions and applied loads are set according to the motion characteristics of the tool model with respect to the base model.

In step S8, the simulation model processed in steps S1-S7 is submitted to a solver of the ABAQUS simulation software for solution operation, so as to obtain an operation result.

Submitting the established simulation model to an ABAQUS solver for solving operation, checking cutting force, stress-strain, material damage and the like in a post-processing module of ABAQUS simulation software after the operation is finished, analyzing and evaluating an operation result in combination with experiments and actual cutting, returning to the step S1 if the simulation result is larger than the actual result or the result is not converged in the operation process, and changing the simulation model for re-operation until the simulation result is similar to the actual result; if the simulation result is close to the actual result, the process returns to step S4 to change the cutting process parameters and find the most suitable cutting process parameter combination according to the cutting force, material damage, etc.

The embodiment is different from the complex and tedious experiment, is simple to operate, only needs to change the numerical value in the software for recalculation, has high accuracy of the calculation result, and is convenient to use and easy to master.

As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.