CN107217133B - Laser impact intensified Finite Element Method - Google Patents
Laser impact intensified Finite Element Method Download PDFInfo
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- CN107217133B CN107217133B CN201710392734.2A CN201710392734A CN107217133B CN 107217133 B CN107217133 B CN 107217133B CN 201710392734 A CN201710392734 A CN 201710392734A CN 107217133 B CN107217133 B CN 107217133B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of laser impact intensified Finite Element Methods, including step：It establishes threedimensional model in ABAQUS, material property parameter is set, using Johnson Cook constitutive equations, dynamic explicit analysis step is set and so that in each analysis step inside target that plasticity variation reaches maximum value, while kinetic energy finally levels off to 0；Subprogram editor is carried out to the laser-impact time of more hot spots and position distribution, realizes the application of load；Mesh generation carries out mesh refinement in Laser Shock Processing domain；It creates analysis operation and carries out Explicit solutions, obtain residual stress field and displacement deformation distribution.Laser impact intensified Finite Element Method provided by the invention has the characteristics that rapid, inexpensive, simple and easy to do, calculating is accurate, and future in engineering applications is good.Conveniently the laser impact intensified of more hot spots can be simulated, to provide reliable basis to parameter optimization.
Description
Technical field
The present invention relates to reiforcing laser impact technology field, more specifically to a kind of laser impact intensified limited
First analogy method.
Background technology
Reiforcing laser impact technology is a kind of novel material surface strengthening means, it is by high power density (GW/
cm2Magnitude), the laser beam of pulse width (ns magnitudes) by transparent restraint layer, act on the suction coated in metal targets surface
Receive coating, coating material absorb laser energy gasify rapidly, formed high temperature, high pressure plasma, the plasma is by about
The effect of beam layer generates metal surface the shock wave of high intensity.When the dynamic yield that the surge pressure of shock wave is more than material is strong
When spending, material surface generates plastic strain, at the end of laser action, due to the reaction of shock zone material, produces inside it
The raw residual compressive stress with certain depth, the presence of residual compressive stress cause the closed effect of crackle, tired to effectively reduce
The driving force of labor crack propagation extends the service life of part.
Three-dimensional Flattened Gaussian Beams are a kind of laser of the light energy spatial distribution with a uniform plateau region, and impact is strong
Change process is brought since complicated mechanism is influenced by a variety of variable factors simultaneously to the optimization of laser impact intensified technological parameter
Very big difficulty.Only it relies on experimental data and operating experience using the method repeatedly attempted, needs to take a substantial amount of time and provide
Gold.And then Finite Element Method is used to the selection of auxiliary laser shock peening technological parameter, while being answered by analyzing stress
Become the variation with displacement to explain strengthening mechanism.Braisted and Brockman are used for the first time in terms of finite element modelling
The method of ABAQUS/Explicit+ABAQUS/Implicit has carried out laser impact intensified simulation, and descendant also mostly uses greatly
This Finite Element Method, but when for more light spot laser shock strengthenings, this method not only takes but also needs continuous
The result of each hot spot Explicit Analysis is brought into implicit analysis, all analyzes and terminates until all hot spots, while for not
Same technological parameter (spot radius, overlapping rate, assault route etc.), needs to establish multiple analysis model, therefore there is an urgent need to one kind
Laser impact intensified carry out sunykatuib analysis of the improved Finite Element Method to more hot spots.
In conclusion the problems such as laser impact intensified parameter optimization for how efficiently solving more hot spots is difficult, is current
Those skilled in the art's urgent problem.
Invention content
In view of this, first of the present invention is designed to provide a kind of laser impact intensified Finite Element Method,
The laser impact intensified parameter optimization that the laser impact intensified Finite Element Method can efficiently solve more hot spots is difficult
The problem of.
In order to reach above-mentioned first purpose, the present invention provides the following technical solutions：
A kind of laser impact intensified Finite Element Method, including step：
Threedimensional model is established in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations, setting
Dynamic explicit analysis step simultaneously so that plasticity variation reaches maximum value inside target in each analysis step, while kinetic energy finally approaches
In 0；
Subprogram editor is carried out to the laser-impact time of more hot spots and position distribution, realizes the application of load；
Mesh generation carries out mesh refinement in Laser Shock Processing domain；
It creates analysis operation and carries out Explicit solutions, obtain residual stress field and displacement deformation distribution.
Preferably, in above-mentioned Finite Element Method, it is thin to carry out grid in Laser Shock Processing domain for the mesh generation
Change, specifically includes：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by the boundary of laser-impact target
Region is set as Infinite Element and carries out mesh generation using C3D8；
The establishment analysis operation carries out Explicit solutions, obtains residual stress field and displacement deformation distribution, specific to wrap
It includes：
It creates analysis operation and generates INP files, the cell type of Infinite Element is changed to CIN3D8 in INP files, it is raw
The INP files of Cheng Xin；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and rear place
Reason finally obtains residual stress field and displacement deformation distribution.
Preferably, in above-mentioned Finite Element Method, the implementation of this method need to only carry out Explicit Analysis, each Explicit Analysis
The time of step is 8 × 10-6s。
Preferably, described that the laser-impact time of more hot spots and position distribution are carried out in above-mentioned Finite Element Method
Subprogram editor, specifically includes：
Using Fortran language editing subroutines, laser-impact time and position distribution to more hot spots are into edlin.
Preferably, in above-mentioned Finite Element Method, the laser is three-dimensional Flattened Gaussian Beams, the space at z=0
It is distributed as following formula：
In formula, N, M, W0x, W0yRespectively exponent number and waist width of the Flattened Gaussian Beams in the direction x, y.
Using laser impact intensified Finite Element Method provided by the invention, the laser reinforcing of more hot spots is rushed
It hits, only need to carry out Explicit Analysis, the load of different location different moments is realized using subprogram, improves efficiency, simultaneously for
Different technological parameters (laser power density, shock peening route, strengthens number, overlapping rate, pulsewidth at spot radius), only needs
An analysis model is established, remaining work is completed by subprogram.Therefore this method has rapid, inexpensive, easy to be easy
Row calculates accurate feature, and future in engineering applications is good.It can be conveniently to the laser impact intensified carry out mould of more hot spots
It is quasi-, to provide reliable basis to parameter optimization.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow diagram of the laser impact intensified Finite Element Method of a specific embodiment of the invention；
Fig. 2 is laser blast wave loading curve.
Specific implementation mode
The embodiment of the invention discloses a kind of Finite Element Methods, excellent in order to the laser impact intensified parameter of more hot spots
Change.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
- Fig. 2 is please referred to Fig.1, Fig. 1 is the flow signal for the laser impact intensified Finite Element Method that the present invention is implemented
Figure；Fig. 2 is laser blast wave loading curve.
In the diagram, a kind of laser impact intensified Finite Element Method, includes the following steps：
S1：It establishes threedimensional model in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations,
Setting dynamic explicit analysis step simultaneously so that plasticity variation reaches maximum value inside target in each analysis step, while kinetic energy is last
Level off to 0；
The time of specific each analysis step can be configured as needed, can be not especially limited herein.
S2：Subprogram editor is carried out to the laser-impact time of more hot spots and position distribution, realizes the application of load；
Namely realize that the application of load, parameter of specific load etc. can be configured as needed by subprogram, in detail
Thin refer to the prior art, and details are not described herein again.
S3：Mesh generation carries out mesh refinement in Laser Shock Processing domain；
S4：It creates analysis operation and carries out Explicit solutions, obtain residual stress field and displacement deformation distribution.
This analytic process need to only use Explicit solvers, you can obtain residual stress and displacement deformation distribution.Pass through
Subprogram realizes the load of more hot spot different location different moments, brings great convenience to the application of load.
Using laser impact intensified Finite Element Method provided by the invention, the laser reinforcing of more hot spots is rushed
It hits, only need to carry out Explicit Analysis, the load of different location different moments is realized using subprogram, improves efficiency, simultaneously for
Different technological parameters (laser power density, shock peening route, strengthens number, overlapping rate, pulsewidth at spot radius), only needs
An analysis model is established, remaining work is completed by subprogram.Therefore this method has rapid, inexpensive, easy to be easy
Row calculates accurate feature, and future in engineering applications is good.It can be conveniently to the laser impact intensified carry out mould of more hot spots
It is quasi-, to provide reliable basis to parameter optimization.
Further, it in above-mentioned steps S3, specifically includes：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by laser-impact target frontier district
Domain is set as Infinite Element and carries out mesh generation using C3D8；
Then, analysis operation is created in step S4 and carries out Explicit solutions, obtains residual stress field and displacement deformation distribution,
It specifically includes：
It creates analysis operation and generates INP files, the cell type of Infinite Element is changed to CIN3D8 in INP files, it is raw
The INP files of Cheng Xin；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and rear place
Reason finally obtains residual stress field and displacement deformation distribution.
Preferably, in above-mentioned Finite Element Method, Explicit Analysis, and the time of each Explicit Analysis step need to only be carried out
It is 8 × 10-6s.According to specific needs, the time that can also be walked to Explicit Analysis is suitably adjusted.
Specifically, in above-mentioned Finite Element Method, sub- journey is carried out to the laser-impact time of more hot spots and position distribution
Sequence editor, specifically includes：
Using Fortran language editing subroutines, laser-impact time and position distribution to more hot spots are into edlin.It adopts
Subprogram editor is carried out with Fortran language, is convenient for the calling of subroutine, the machine that other can also be used conventional as needed
Device language editing subroutine.
Preferably, in above-mentioned Finite Element Method, the laser is three-dimensional Flattened Gaussian Beams, the space at z=0
It is distributed as following formula：
In formula, N, M, W0x, W0yRespectively exponent number and waist width of the Flattened Gaussian Beams in the direction x, y.As needed
Other conventional laser beams may be used.
It is illustrated by taking a preferred embodiment as an example below.
By taking material 2050-T8 aluminium alloys as an example, finite element modelling is carried out, is included the following steps：
Step 1, geometrical model and definition material and section attribute are established in ABAQUS：Geometric dimension is 25mm*25mm*
5mm, density of material 2750kg/m3, Poisson's ratio 0.33, elasticity modulus 72GPa.It is described using Johnson-Cook models
The dynamic constitutive of 2050-T8, formula (1) are the expression formula of the model.
In formula：A is yield strength, and B and n have reacted the strain hardening feature of material, and C reflects strain rate to material property
Influence, εpEquivalent plastic strain is represented,For static strain rate, value herein is A=510MPa, B=200MPa, n
=0.45, C=0.02,Dynamic explicit analysis step is set it is ensured that in each analysis step plasticity inside target
Variation reaches maximum value, while kinetic energy, finally close to 0, the time of each analysis step is set as 8 × 10-6s；
Apply load：Laser power density is 3.5GW/cm2, using circular light class, spot diameter 1.5mm, pulse width
It is set as 10ns, spatial distribution of the three-dimensional Flattened Gaussian Beams at z=0 is formula 2, and laser blast wave loading curve is Fig. 2,
Using Fortran language editing subroutines, laser-impact time and position distribution to more hot spots are into edlin；
In formula, N, M, W0x, W0yRespectively exponent number and waist width of the Flattened Gaussian Beams in the direction x, y.
Step 3, mesh generation：Mesh refinement is carried out in Laser Shock Processing domain, uses cell type for C3D8R；It will
Laser-impact target borderline region is set as Infinite Element, and first using cell type C3D8, unit size size is for the part
150μm*150μm*50μm；
Step 4, it creates analysis operation and generates INP files, be changed to the cell type of Infinite Element part in INP files
CIN3D8 generates new INP files；Analysis operation is created again, while calling new INP files and Fortran language editors
Subprogram, submit analysis operation and post-processing, finally obtain residual stress field and displacement deformation distribution.
The aluminium alloy plate laser impact intensified to three-dimensional Flattened Gaussian Beams is simulated using finite element software ABAQUS
Analysis, this analytic process need to only use Explicit solvers, you can obtain residual stress and displacement deformation distribution.The present invention is logical
Crossing Fortran language editing subroutines realizes the load of more hot spot different location different moments, is brought to the application of load
Great convenience, while in optimization shock peening technological parameter (laser power density, spot radius, shock peening route, reinforcing time
Number, overlapping rate, pulsewidth) on bring great convenience, study process above parameter on laser shock peening influence when only need
An analysis model is established, remaining is operated in subprogram and completes, and improves modeling efficiency.This finite element model simultaneously
Infinite Element is used as reflecting boundary, prevents from generating stress wave reflection on boundary, reenters model, so as to cause knot
Fruit is incorrect, and the use of Infinite Element, which can also be reduced, calculates the time.The analogy method is high, at low cost with modeling efficiency, counts
It calculates feature true, that the time is short accurately, there is certain future in engineering applications.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (5)
1. a kind of laser impact intensified Finite Element Method, which is characterized in that including step：
Threedimensional model is established in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations, setting dynamic
Explicit Analysis walks and so that in each analysis walks inside target that plasticity variation reaches maximum value, while kinetic energy finally levels off to 0；
Subprogram editor is carried out to the laser-impact time of more hot spots and position distribution, realizes the application of load；
Mesh generation carries out mesh refinement in Laser Shock Processing domain；
It creates analysis operation and carries out Explicit solutions, obtain residual stress field and displacement deformation distribution.
2. Finite Element Method according to claim 1, which is characterized in that the mesh generation is strong in laser-impact
Change region and carry out mesh refinement, specifically includes：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by the borderline region of laser-impact target
It is set as Infinite Element and mesh generation is carried out using C3D8；
It creates analysis operation and carries out Explicit solutions, obtain residual stress field and displacement deformation distribution, specifically include：
It creates analysis operation and generates INP files, the cell type of Infinite Element is changed to CIN3D8 in INP files, generate new
INP files；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and post-processing,
Finally obtain residual stress field and displacement deformation distribution.
3. Finite Element Method according to claim 1, which is characterized in that the implementation of this method only need to explicitly be divided
The time of analysis, each Explicit Analysis step is 8 × 10-6s。
4. Finite Element Method according to claim 1, which is characterized in that the laser-impact time to more hot spots
Subprogram editor is carried out with position distribution, is specifically included：
Using Fortran language editing subroutines, laser-impact time and position distribution to more hot spots are into edlin.
5. according to claim 1-4 any one of them Finite Element Methods, which is characterized in that the laser is three-dimensional flat-top
Gaussian beam, the spatial distribution at z=0 are following formula：
In formula, N, M, W0x, W0yRespectively exponent number and waist width of the Flattened Gaussian Beams in the direction x, y.
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| CN107794362B (en) * | 2017-09-30 | 2020-02-07 | 广东工业大学 | Online real-time variable pulse width blade laser shock strengthening deformation control method |
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| CN110361121B (en) * | 2018-04-09 | 2020-12-25 | 中国科学院沈阳自动化研究所 | Accurate prediction method for laser shock peening induced residual stress field |
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