CN107217133A - Laser impact intensified Finite Element Method - Google Patents
Laser impact intensified Finite Element Method Download PDFInfo
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- CN107217133A CN107217133A CN201710392734.2A CN201710392734A CN107217133A CN 107217133 A CN107217133 A CN 107217133A CN 201710392734 A CN201710392734 A CN 201710392734A CN 107217133 A CN107217133 A CN 107217133A
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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
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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
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses a kind of laser impact intensified Finite Element Method, including step：Set up threedimensional model in ABAQUS, material property parameter is set, using Johnson Cook constitutive equations, set dynamic explicit analysis step simultaneously make it that plasticity change reaches maximum inside target in each analysis step, while kinetic energy finally levels off to 0；Subprogram editor is carried out to the laser-impact time of many hot spots and position distribution, the application of load is realized；Mesh generation, mesh refinement is carried out in Laser Shock Processing domain；Create analysis operation and carry out Explicit solutions, obtain residual stress field and displacement deformation distribution.The laser impact intensified Finite Element Method that the present invention is provided, with it is rapid, inexpensive, simple and easy to do, calculate it is accurate the characteristics of, future in engineering applications is good.Conveniently the laser impact intensified of many hot spots can be simulated, so as 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 new material surface strengthening means, and it is by high power density (GW/
cm2Magnitude), the laser beam of pulse width (ns magnitudes) by transparent restraint layer, act on the suction for being coated in metal targets surface
Coating is received, coating material absorbs laser energy and gasified rapidly, forms high temperature, the plasma of high pressure, the plasma is by about
The effect of beam layer produces the shock wave of high intensity to metal surface.When the dynamic yield that the surge pressure of shock wave exceedes material is strong
When spending, at the end of material surface produces plastic strain, laser action, due to the reaction of shock zone material, produced inside it
The raw residual compressive stress with certain depth, the presence of residual compressive stress causes the closed effect of crackle, so as to effectively reduce tired
The driving force of labor Crack Extension, extends the life-span of part.
Three-dimensional Flattened Gaussian Beams are laser of the class light energy spatial distribution with a uniform plateau region, and it impacts strong
Change process is influenceed by a variety of variable factors simultaneously due to complicated mechanism, and the optimization to laser impact intensified technological parameter is brought
Very big difficulty.Only the method repeatedly attempted is used, it is necessary to take a substantial amount of time and provide by experimental data and operating experience
Gold.And then Finite Element Method is used to the selection of auxiliary laser shock peening technological parameter, while should by analyzing stress
Become the change with displacement to explain strengthening mechanism.Braisted and Brockman are used first in terms of finite element modelling
ABAQUS/Explicit+ABAQUS/Implicit method has carried out laser impact intensified simulation, and descendant also uses mostly
This Finite Element Method, but during for many light spot laser shock strengthenings, this method not only takes but also needed 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.) is, it is necessary to set up multiple analysis model, therefore in the urgent need to one kind
Laser impact intensified carry out sunykatuib analysis of the improved Finite Element Method to many hot spots.
In summary, the problems such as how efficiently solving the laser impact intensified parameter optimization difficulty of many hot spots, is current
Those skilled in the art's urgent problem.
The content of the invention
In view of this, first purpose of the invention is 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 many hot spots is difficult
The problem of.
In order to reach above-mentioned first purpose, the present invention provides following technical scheme：
A kind of laser impact intensified Finite Element Method, including step：
Threedimensional model is set up in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations, is set
Dynamic explicit analysis step simultaneously make it that plasticity change reaches maximum inside target in each analysis step, while the last convergence of kinetic energy
In 0；
Subprogram editor is carried out to the laser-impact time of many hot spots and position distribution, the application of load is realized；
Mesh generation, mesh refinement is carried out in Laser Shock Processing domain；
Create analysis operation and carry out Explicit solutions, obtain residual stress field and displacement deformation distribution.
Preferably, in above-mentioned Finite Element Method, the network is divided, and is specifically included：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by the border of laser-impact target
Region is set to Infinite Element and carries out mesh generation using C3D8；
It is described to create analysis operation progress Explicit solutions, obtain residual stress field and displacement deformation distribution, specific bag
Include：
Analysis operation generation INP files are created, the cell type of Infinite Element is changed to CIN3D8 in INP files, it is raw
Cheng Xin INP files；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and rear place
Reason, finally gives 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, it is described that the laser-impact time of many hot spots and position distribution are carried out in above-mentioned Finite Element Method
Subprogram editor, specifically includes：
Using Fortran language editing subroutines, edlin is entered to the laser-impact time of many hot spots and position distribution.
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 x, y direction.
The laser impact intensified Finite Element Method provided using the present invention, is rushed for the laser reinforcing of many hot spots
Hit, only need to carry out Explicit Analysis, the loading of diverse location not in the same time is realized using subprogram, efficiency is improved, simultaneously for
Different technological parameters (laser power density, spot radius, shock peening route, reinforcing number of times, overlapping rate, pulsewidth), is only needed
An analysis model is set up, remaining work is completed by subprogram.Therefore this method has rapid, inexpensive, easy to be easy
The characteristics of going, calculate accurate, future in engineering applications is good.Laser impact intensified carry out mould that can conveniently to many hot spots
Intend, so as to provide reliable basis to parameter optimization.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the laser impact intensified Finite Element Method of a specific embodiment of the invention；
Fig. 2 is laser blast wave loading curve.
Embodiment
It is excellent in order to the laser impact intensified parameter of many hot spots the embodiment of the invention discloses a kind of Finite Element Method
Change.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Refer to Fig. 1-Fig. 2, the flow signal for the laser impact intensified Finite Element Method that Fig. 1 is implemented for the present invention
Figure；Fig. 2 is laser blast wave loading curve.
In the diagram, a kind of laser impact intensified Finite Element Method, comprises the following steps：
S1：Threedimensional model is set up in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations,
Dynamic explicit analysis step is set and make it that plasticity change reaches maximum 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 many hot spots and position distribution, the application of load is realized；
The application of load is namely realized by subprogram, the parameter of specific load etc. can be configured as needed, in detail
Prior art carefully is refer to, here is omitted.
S3：Mesh generation, mesh refinement is carried out in Laser Shock Processing domain；
S4：Create analysis operation and carry out Explicit solutions, obtain residual stress field and displacement deformation distribution.
This analysis process need to only use Explicit solvers, you can obtain residual stress and displacement deformation distribution.Pass through
Subprogram realizes the loading of many hot spot diverse locations not in the same time, and the application to load brings great convenience.
The laser impact intensified Finite Element Method provided using the present invention, is rushed for the laser reinforcing of many hot spots
Hit, only need to carry out Explicit Analysis, the loading of diverse location not in the same time is realized using subprogram, efficiency is improved, simultaneously for
Different technological parameters (laser power density, spot radius, shock peening route, reinforcing number of times, overlapping rate, pulsewidth), is only needed
An analysis model is set up, remaining work is completed by subprogram.Therefore this method has rapid, inexpensive, easy to be easy
The characteristics of going, calculate accurate, future in engineering applications is good.Laser impact intensified carry out mould that can conveniently to many hot spots
Intend, so as to provide reliable basis to parameter optimization.
Further, in above-mentioned steps S3, specifically include：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by laser-impact target frontier district
Domain is set to Infinite Element and carries out mesh generation using C3D8；
Then, analysis operation is created in step S4 and carries out Explicit solutions, residual stress field and displacement deformation distribution is obtained,
Specifically include：
Analysis operation generation INP files are created, the cell type of Infinite Element is changed to CIN3D8 in INP files, it is raw
Cheng Xin INP files；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and rear place
Reason, finally gives 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
For 8 × 10-6s.According to specific needs, the time that Explicit Analysis is walked can also suitably be adjusted.
Specifically, in above-mentioned Finite Element Method, sub- journey is carried out to the laser-impact time of many hot spots and position distribution
Sequence editor, specifically includes：
Using Fortran language editing subroutines, edlin is entered to the laser-impact time of many hot spots and position distribution.Adopt
Subprogram editor is carried out with Fortran language, is easy to calling for subroutine, other conventional machines can also be used 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 x, y direction.As needed
Other conventional laser beams can be used.
Below by one preferred embodiment exemplified by illustrate.
By taking material 2050-T8 aluminium alloys as an example, finite element modelling is carried out, is comprised the following steps：
Step 1, geometrical model and definition material and section attribute are set up in ABAQUS：Physical dimension is 25mm*25mm*
5mm, density of material is 2750kg/m3, Poisson's ratio 0.33, modulus of elasticity is 72GPa.Described using Johnson-Cook models
2050-T8 dynamic constitutive, formula (1) is 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, εpRepresent equivalent plastic strain,For static strain speed, 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
Change reaches maximum, while kinetic energy is last close to 0, the set of time of each analysis step is 8 × 10-6s；
Imposed load：Laser power density is 3.5GW/cm2, using circular light class, spot diameter 1.5mm, pulse width
10ns is set to, 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, edlin is entered to the laser-impact time of many hot spots and position distribution；
In formula, N, M, W0x, W0yRespectively exponent number and waist width of the Flattened Gaussian Beams in x, y direction.
Step 3, mesh generation：Mesh refinement is carried out in Laser Shock Processing domain, cell type is used for C3D8R；Will
Laser-impact target borderline region is set to Infinite Element, and the part uses cell type C3D8 first, and unit size size is
150μm*150μm*50μm；
Step 4, analysis operation generation INP files are created, the cell type of Infinite Element part are changed 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 give 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 analysis 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 loading of many hot spot diverse locations not in the same time, and the application to load is brought
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 set up, remaining is operated in subprogram and completed, and improves modeling efficiency.While this FEM model
Infinite Element is employed as reflecting boundary, prevents from producing stress wave reflection on border, reenters model, so as to cause knot
Really incorrect, the use of Infinite Element can also reduce the calculating time.The analogy method has that modeling efficiency is high, cost is low, meter
The characteristics of true, the time is short is calculated accurately, with certain future in engineering applications.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for 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, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (5)
1. a kind of laser impact intensified Finite Element Method, it is characterised in that including step：
Threedimensional model is set up in ABAQUS, material property parameter is set, using Johnson-Cook constitutive equations, dynamic is set
Explicit Analysis is walked and so that plasticity change reaches maximum inside target in each analysis step, while kinetic energy finally levels off to 0；
Subprogram editor is carried out to the laser-impact time of many hot spots and position distribution, the application of load is realized；
Mesh generation, mesh refinement is carried out in Laser Shock Processing domain；
Create analysis operation and carry out Explicit solutions, obtain residual stress field and displacement deformation distribution.
2. Finite Element Method according to claim 1, it is characterised in that the network is divided, and is specifically included：
Laser Shock Processing domain carries out mesh refinement using cell type C3D8R, and by the borderline region of laser-impact target
It is set to Infinite Element and mesh generation is carried out using C3D8；
Create analysis operation and carry out Explicit solutions, obtain residual stress field and displacement deformation distribution, specifically include：
Analysis operation generation INP files are created, the cell type of Infinite Element CIN3D8 are changed in INP files, generation is new
INP files；Analysis operation is created again, while calling new INP files and subprogram, submits analysis operation and post processing,
Finally give residual stress field and displacement deformation distribution.
3. Finite Element Method according to claim 1, it is characterised in that the implementation of this method only need to explicitly be divided
Analysis, the time of each Explicit Analysis step is 8 × 10-6s。
4. Finite Element Method according to claim 1, it is characterised in that the laser-impact time to many hot spots
Subprogram editor is carried out with position distribution, is specifically included：
Using Fortran language editing subroutines, edlin is entered to the laser-impact time of many hot spots and position distribution.
5. the Finite Element Method according to claim any one of 1-4, it is characterised in that the laser is three-dimensional flat-top
Gaussian beam, the spatial distribution at z=0 is following formula：
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| CN107794362A (en) * | 2017-09-30 | 2018-03-13 | 广东工业大学 | A kind of laser impact intensified control shape method of blade of online variable pulse width in real time |
| CN107937705A (en) * | 2017-11-28 | 2018-04-20 | 广东工业大学 | A kind of method and system of metal-surface strengthening |
| CN108531714A (en) * | 2018-07-04 | 2018-09-14 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
| CN110162834A (en) * | 2019-04-11 | 2019-08-23 | 广东镭奔激光科技有限公司 | The analogy method and reinforcing quality control apparatus of laser-impact data based on acquisition |
| CN110361121A (en) * | 2018-04-09 | 2019-10-22 | 中国科学院沈阳自动化研究所 | A kind of accurate prediction technique in laser impact intensified induction residual stress field |
| WO2020155966A1 (en) * | 2019-01-31 | 2020-08-06 | 中国石油大学(华东) | Control method for welding stress and distortion in local post weld heat treatment of ultra-large pressure vessel |
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| CN107794362A (en) * | 2017-09-30 | 2018-03-13 | 广东工业大学 | A kind of laser impact intensified control shape method of blade of online variable pulse width in real time |
| 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 |
| CN107937705B (en) * | 2017-11-28 | 2019-11-08 | 广东工业大学 | A kind of method and system of metal-surface strengthening |
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| CN108531714B (en) * | 2018-07-04 | 2019-05-10 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
| CN108531714A (en) * | 2018-07-04 | 2018-09-14 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
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