CN108491612A - The Finite Element Method of scheme of material selection is provided for multiple tube hydraulic bulging process - Google Patents
The Finite Element Method of scheme of material selection is provided for multiple tube hydraulic bulging process Download PDFInfo
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- CN108491612A CN108491612A CN201810216714.4A CN201810216714A CN108491612A CN 108491612 A CN108491612 A CN 108491612A CN 201810216714 A CN201810216714 A CN 201810216714A CN 108491612 A CN108491612 A CN 108491612A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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Abstract
The invention discloses a kind of Finite Element Methods providing scheme of material selection for multiple tube hydraulic bulging process.The present invention includes that step (1) establishes composite bimetal pipe two dimensional model；(2) composite bimetal pipe model outer tube and the corresponding material properties of inner tube are assigned；(3) by composite bimetal pipe Model instantiation；(4) analysis step is established；(5) contact pair is established；(6) apply load and boundary condition；(7) grid division；(8) corresponding operation is created, and submits operation, into analytical model；(9) enter post-processing module on the basis of step (8) calculates completion, choose radial residual contact stress as the index for judging composite bimetal pipe interface bond strength, record corresponding value；(10) material parameter is changed in return to step (2), then immediately proceeds to step (8) and (9), repeats this step until having analyzed all material models.The R＆D cycle can be greatly reduced in the present invention, economize on resources, and reduce cost.
Description
Technical field：
The present invention relates to a kind of Finite Element Methods providing scheme of material selection for multiple tube hydraulic bulging process, belong to pipe
Road engineering CAD technical field.
Background technology：
Hydraulic expanding-forming, which prepares composite bimetal pipe and has, swollen closes that uniform, not damaged, at low cost, production process is pollution-free etc. one
Number of features, but faced of high cost, all by the limitations such as bulging process equipment and pipeline own dimensions by testing come selection
The problems such as phase is long so that the production technology is restricted.
Invention content
The object of the present invention is to provide a kind of finite element modelling sides providing scheme of material selection for multiple tube hydraulic bulging process
Method simulates the hydraulic expanding-forming mistake of composite bimetal pipe with finite element means using CAD (CAE) technology
Journey obtains the interface bond strength of composite bimetal pipe, instructs the material of actual production by simulating the multiple tube of different materials
Material selection.The R＆D cycle can be greatly reduced in this method, economize on resources, and reduce cost.
Above-mentioned purpose is achieved through the following technical solutions：
The Finite Element Method of scheme of material selection is provided for multiple tube hydraulic bulging process, this method comprises the following steps：
(1) composite bimetal pipe two dimensional model is established；
(2) composite bimetal pipe model outer tube and the corresponding material properties of inner tube are assigned；
(3) by composite bimetal pipe Model instantiation；
(4) analysis step is established；
(5) contact pair is established；
(6) apply load and boundary condition；
(7) grid division；
(8) corresponding operation is created, and submits operation, into analytical model；
(9) enter post-processing module on the basis of step (8) calculating is completed, choose radial residual contact stress and be used as and sentence
The index of disconnected composite bimetal pipe interface bond strength, records corresponding value；
(10) return to step (2) change material parameter, then immediately proceed to step (8) and (9), repeat this step up to
All material models are analyzed.
Preferably, in the step (1), take a quarter of composite bimetal pipe cross section carry out establishing bimetallic it is multiple
Pipe two dimensional model is closed, negligible axial stress is simulated using Plane stress model.
Preferably, the imparting composite bimetal pipe model outer tube described in step (2) and the corresponding material properties of inner tube
When set outer tube to perfect elastic material, then material properties are arranged according to the actual stress of material-strain curve in inner tube, right
In outer tube, the elastic mould value and Poisson's ratio of input material；For inner tube, the first elasticity modulus and Poisson's ratio of input material
Value enters back into plasticity module input plastic, including plastic stress and strain.
Preferably, the specific method for establishing analysis step described in step (4) is：According to composite bimetal pipe Hydraulic Expansion
Three analysis steps are arranged in shape process characteristic：The first step, on-load pressure make to come into contact between inner and outer pipe；Second step, pressurize are certain
Time；Third walks, unloading pressure.
Preferably, foundation contact described in step (5) selects static universal contact to referring to according to model feature, if
It is main face to set outer pipe internal surface, and inner tube outer surface is from face, it is assumed that without tangent direction friction, type is limited sliding between face and face, builds
Vertical contact pair.
Preferably, the application load described in step (6) and boundary condition, specifically：Load is applied to table in inner tube
Face, type are pressure, and load mode is linear loading；According to the stress-strain shape during composite bimetal pipe hydraulic expanding-forming
The ess-strain of state, negligible axial and circumferential direction, boundary condition should be set as limiting its axial and circumferential displacement, only allow diameter
To being subjected to displacement.
Preferably, the grid division described in step (7) carries out mesh generation to composite bimetal pipe model, using four
Side shape grid controls sizing grid by calculating, obtains approximating square grid.
Advantageous effect：
The present invention simulates heavy caliber composite bimetal pipe hydraulic expanding-forming mistake by using Finite Element Simulation Software ABAQUS
Journey has the following advantages：Calculation amount is reduced relative to three-dimensional entity model using two dimensional surface stress model, is saved
Computing resource；By simulating the swollen conjunction performance of different materials pipeline, selection guidance is provided for enterprise practical production；Effectively contracting
The short R＆D cycle of composite bimetal pipe；Save R＆D costs.
Description of the drawings
Fig. 1 is the specific implementation step flow chart of the present invention.
Fig. 2 is the two dimensional surface stress model figure of composite bimetal pipe hydraulic expanding-forming FEM Simulation, according to model
Feature has chosen a quarter of composite bimetal pipe cross section as analysis object.
Fig. 3 is load and boundary condition applying mode figure in the present invention.
Fig. 4 is the design sketch for carrying out mesh generation in the present invention to entity.
Specific implementation mode
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific implementation modes are only used for
It is bright the present invention rather than limit the scope of the invention.
A kind of Finite Element Method providing scheme of material selection for multiple tube hydraulic bulging process, flow join Fig. 1, including with
Lower step：
(1) composite bimetal pipe two dimensional model is established.
Size of pipe and tubing used in simulation：Outer tube outer tube：Φ 219*6mm, inner tube：Φ 201*1mm take 1/4 cross section of tubing
It is analyzed, ignores pipeline axial stress, calculated by Plane stress model, establish two-dimentional composite bimetal pipe model.It is double
Metal composite pipe illustraton of model is referring to Fig. 2.
(2) composite bimetal pipe model outer tube and the corresponding material properties of inner tube are assigned.
Inner tube chooses certain stainless steel A1 in simulation, and outer tube is certain carbon steel B.Assuming that the elasticity modulus of inner tube material A1 is
210GPa, Poisson's ratio 0.3, the elasticity modulus of yield strength 306MPa, outer tube material B are 205GPa, Poisson's ratio 0.3,
Assign two kinds of material properties to inner and outer pipe respectively.
The residual contact stress and pipeline material after composite bimetal pipe hydraulic expanding-forming can be obtained according to elastic plastic theory
Relation formula between mechanical property：
Thus formula is it is recognised that under conditions of hydraulic expanding-forming power and pipeline specifications size constancy, the springform of tubing
Amount and Poisson's ratio influence the residual contact stress between pipeline interface.Therefore, in a model by changing pipeline material mechanical property
The value of parameter, i.e. elasticity modulus, Poisson when plastic stress-strain calculates influence of the material to pipeline bulging effect to simulate.
(3) by composite bimetal pipe Model instantiation.
By installation step by composite bimetal pipe Model instantiation, entity type selects dependent, and (grid is in component
On), computing resource can be saved.
(4) analysis step is established.
Create three analysis steps：Three analysis steps are set：The first step, on-load pressure make to come into contact between inner and outer pipe；Second
Step, pressurize certain time；Third walks, unloading pressure.Analysis step duration is simulated according to produce reality.
(5) contact is established.
The inside and outside pipe internal surface of selection is main face, and inner tube outer surface is from face, and contact type is plane-plane contact, and tangential nothing is rubbed
It wipes, establishes contact pair.
(6) apply load and boundary condition.
Load and boundary condition are applied to composite bimetal pipe model respectively：
The application of load：It is 22.3MPa to be produced according to enterprise practical and choose magnitude of load, and load is applied to table in inner tube
Face, type are pressure, and load mode is linear loading.
The application of boundary condition：Ignore the axial and circumferential ess-strain of composite bimetal pipe, under the conditions of cylindrical coordinates, only
Allow radial direction to be subjected to displacement, limits axial and circumferential displacement.
The application of load and boundary condition is referring to Fig. 3.
(7) grid division.
Choose the mesh shape of quadrangle, cell type CPS4R, i.e. four node bilinearity plane stress quadrangles decrement
Integral unit.Seed is arranged to model by calculating, is selected from the method grid division by dividing, is obtaining the approximation of rule just
Rectangular grid.Final division result is referring to Fig. 4.
(8) corresponding operation is created, and submits operation, into analytical model.
(9) enter post-processing module on the basis of step 8) calculates completion.According to actual demand, CPRESS is chosen ---
I.e. radial residual contact stress is as the index for judging composite bimetal pipe interface bond strength.Record corresponding value.
It is 0.55MPa that radial residual contact stress value, which is calculated,.
(10) return to step 2), material parameter is changed, step 8), 9) is then immediately proceeded to.This step is repeated until analysis
Complete all material models.
(11) return to step 2), change inside and outside tube material.Inner tube material A2 elasticity modulus is 215GPa, and Poisson's ratio is
0.26, yield strength 347MPa；Outer tube material B is constant, elasticity modulus 205GPa, Poisson's ratio 0.3.Assign inner and outer pipes
Corresponding material properties, return to step 8), into operation module, submit operation.After the completion of calculating, radial remaining contact is obtained
Pressure value is 0.26MPa.
For composite bimetal pipe prepared by hydraulic bulging process, binding force is bigger between pipe, then tube performance is better.Inner tube
When material is A1, residual contact stress is up to 0.55MPa, and when inner tube material is A2, and residual contact stress only has between pipe
0.26MPa reduces 53% compared to A1.Therefore in production, A1 tubing should be selected to be used as inner tube, i.e., elasticity modulus is
210GPa, Poisson's ratio 0.3, yield strength are the stainless steel material of 306MPa, and pipeline is swollen, and conjunction is better.
It should be pointed out that above-mentioned embodiment is only intended to clearly illustrate example, and not to embodiment
It limits, there is no necessity and possibility to exhaust all the enbodiments.Each component part being not known in the present embodiment
It is realized with the prior art.For those skilled in the art, in the premise for not departing from the principle of the invention
Under, several improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of Finite Element Method providing scheme of material selection for multiple tube hydraulic bulging process, which is characterized in that this method
Include the following steps：
(1) composite bimetal pipe two dimensional model is established；
(2) composite bimetal pipe model outer tube and the corresponding material properties of inner tube are assigned；
(3) by composite bimetal pipe Model instantiation；
(4) analysis step is established；
(5) contact pair is established；
(6) apply load and boundary condition；
(7) grid division；
(8) corresponding operation is created, and submits operation, into analytical model；
(9) enter post-processing module on the basis of step (8) calculates completion, it is double as judgement to choose radial residual contact stress
The index of metal composite pipe interface bond strength records corresponding value；
(10) material parameter is changed in return to step (2), then immediately proceeds to step (8) and (9), repeats this step until analysis
Complete all material models.
2. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, in the step (1), a quarter of composite bimetal pipe cross section is taken to carry out establishing composite bimetal pipe two dimension
Model, negligible axial stress, is simulated using Plane stress model.
3. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, by outer tube when the corresponding material properties of the imparting composite bimetal pipe model outer tube and inner tube described in step (2)
It is set as perfect elastic material, then material properties are arranged according to the actual stress of material-strain curve in inner tube, defeated for outer tube
Enter the elastic mould value and Poisson's ratio of material；For inner tube, the first elasticity modulus of input material and Poisson ratio, modeling is entered back into
Property module input plastic, including plastic stress and strain.
4. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, the specific method for establishing analysis step described in step (4) is：It is special according to composite bimetal pipe hydraulic bulging process
Three analysis steps are arranged in point：The first step, on-load pressure make to come into contact between inner and outer pipe；Second step, pressurize certain time；Third
Step, unloading pressure.
5. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, the foundation contact described in step (5) is arranged to referring to selecting static universal contact according to model feature in outer tube
Surface is interarea, and inner tube outer surface is from face, it is assumed that without tangent direction friction between face and face, type is limited sliding, establishes contact pair.
6. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, the application load described in step (6) and boundary condition, specifically：Load is applied to interior pipe internal surface, and type is
Pressure, load mode are linear loading；According to the stress-strain state during composite bimetal pipe hydraulic expanding-forming, ignore axis
To and circumferential ess-strain, boundary condition should be set as limiting its axial and circumferential displacement, be permit only radial and be subjected to displacement.
7. the Finite Element Method according to claim 1 that scheme of material selection is provided for multiple tube hydraulic bulging process,
It is characterized in that, the grid division described in step (7) carries out mesh generation to composite bimetal pipe model, using network of quadrilaterals
Lattice control sizing grid by calculating, obtain approximating square grid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810216714.4A CN108491612A (en) | 2018-03-15 | 2018-03-15 | The Finite Element Method of scheme of material selection is provided for multiple tube hydraulic bulging process |
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| CN201810216714.4A CN108491612A (en) | 2018-03-15 | 2018-03-15 | The Finite Element Method of scheme of material selection is provided for multiple tube hydraulic bulging process |
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Cited By (4)
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| CN110287598A (en) * | 2019-06-26 | 2019-09-27 | 太原科技大学 | A kind of design method of expansion coupling sleeve bearing capacity |
| CN112001105A (en) * | 2020-08-25 | 2020-11-27 | 中国科学院金属研究所 | Stability analysis method for metal structure contact under cyclic load effect |
| CN112307660A (en) * | 2020-10-30 | 2021-02-02 | 江苏科技大学 | Method for calculating modulus-free bulging numerical value of cylindrical shell of submersible |
| CN114086184A (en) * | 2021-11-01 | 2022-02-25 | 西安石油大学 | Temperature-resistant anode anticorrosion tool and anticorrosion method applicable to outside of oil pipe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110287598A (en) * | 2019-06-26 | 2019-09-27 | 太原科技大学 | A kind of design method of expansion coupling sleeve bearing capacity |
| CN110287598B (en) * | 2019-06-26 | 2022-07-05 | 太原科技大学 | Design method for bearing capacity of expansion coupling sleeve |
| CN112001105A (en) * | 2020-08-25 | 2020-11-27 | 中国科学院金属研究所 | Stability analysis method for metal structure contact under cyclic load effect |
| CN112001105B (en) * | 2020-08-25 | 2024-01-02 | 中国科学院金属研究所 | Metal structure contact stability analysis method under cyclic load effect |
| CN112307660A (en) * | 2020-10-30 | 2021-02-02 | 江苏科技大学 | Method for calculating modulus-free bulging numerical value of cylindrical shell of submersible |
| CN112307660B (en) * | 2020-10-30 | 2024-08-06 | 江苏科技大学 | Numerical calculation method for model-free bulging of cylindrical shell of submersible |
| CN114086184A (en) * | 2021-11-01 | 2022-02-25 | 西安石油大学 | Temperature-resistant anode anticorrosion tool and anticorrosion method applicable to outside of oil pipe |
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