CN110147650A - The finite element modeling method of intensity adjustable material - Google Patents
The finite element modeling method of intensity adjustable material Download PDFInfo
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- CN110147650A CN110147650A CN201910549049.5A CN201910549049A CN110147650A CN 110147650 A CN110147650 A CN 110147650A CN 201910549049 A CN201910549049 A CN 201910549049A CN 110147650 A CN110147650 A CN 110147650A
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- 239000000463 material Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000007704 transition Effects 0.000 claims abstract description 60
- 230000008859 change Effects 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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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
- G06F30/15—Vehicle, aircraft or watercraft design
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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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Abstract
Present invention discloses the finite element modeling methods of intensity adjustable material, comprising: finite element modeling step carries out Global Finite Element Model to the part of intensity adjustable material, and grid therein uses deformable shell unit.Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate.Yield strength calculates step, in three-dimensional coordinate, calculates yield strength according to the change direction of the strength of materials, yield strength is in three-dimensional coordinate, the consecutive variations according to spatial position.The finite element modeling method of intensity adjustable material of the invention can effectively simplify the modeling procedure of intensity adjustable part, and the modeling time can save 80%.In addition in contrast to the step curve of classical resolution method, the present invention uses full curve in the yield strength of transition region, and accuracy can be improved 30%.
Description
Technical field
The present invention relates to automobiles to research and develop manufacturing field, more specifically to the modeling method of intensity adjustable material components.
Background technique
Currently, domestic automobile industry flourishes, the relevant every regulation of automotive safety and evaluation system are also increasingly fine
With it is stringent.In order to save automobile research cost, at vehicle research and development initial stage largely using area of computer aided simulation calculating come to design
It is verified and is optimized.Computer Simulation cost of implementation is low, rhythm is fast, can meet the needs of industry well.In computer
It in the application of emulation, is emulated to have obtained extensive utilization using FEM calculation, especially in collision simulation verifying and optimization side
Face mainly carries out analog simulation using finite element modeling.
With the promotion of every safety standard and environmental requirement, application of the various new materials in real vehicle is also increasingly wider
It is general.One of important new material is exactly intensity adjustable material, is mainly used for the important body structural members such as A column, B column.
Intensity adjustable material refers to that the same part has different Intensity attributes in different zones.It will be under room temperature
22MnB5 steel plate is heated to 880 DEG C~950 DEG C, is allowed to uniform austenitic, by controlling the cooling velocity of different location come shadow
It rings austenite and is converted into the degree of martensite, to realize different parts intensity difference alienation, obtain intensity adjustable part.
Since the yield strength of different location on the part of intensity adjustable material is different, compare when being modeled
Trouble, needs to carry out operation respectively to the yield strength of different location.
Fig. 1, Fig. 2 a and Fig. 2 b, which are disclosed, to carry out finite element modeling to the part of intensity adjustable material in the prior art and calculates
The process of yield strength.Wherein Fig. 1 discloses the finite element model of the B column part of intensity adjustable material.Fig. 2 a and Fig. 2 b are disclosed
The process of yield strength calculating is carried out to the B column part of intensity adjustable material in the prior art.
Refering to what is shown in Fig. 1, the B column part of intensity adjustable material includes three regions: floppy drive, transition region and hard area.Soft zone 102
Yield strength be fixed as σ1, the yield strength in hard area 106 is fixed as σ2, the yield strength of transition region 104 gradually changes,
Transition region 104 is identical as soft zone 102 as the yield strength for the part that soft zone 102 connects, and is σ1, transition region 104 and 106 phase of hard area
The yield strength connect is identical as hard area 106, is σ2.Inside transition region 104, yield strength is gradually from σ1It is changed to σ2.B column zero
Part mainly extends along Z-direction, therefore the strength of materials variation of the B column part of intensity adjustable material is changed along Z-direction, is one-dimensional change
Change.For the spatial position of Z-direction, l1It is transition region close to the spatial position of soft zone one end, l2It is transition region close to hard area one end
Spatial position.In other words, l1The following are soft zones 102, l1With l2Between be transition region 104, l2The above are hard areas 106.
As shown in connection with fig. 1, it is assumed that the parameter of the B column part of intensity adjustable material is as follows: length unit is millimeter, is sat in the overall situation
In mark, it is soft zone, yield strength 400MPa within the scope of 180mm that B column Z-direction, which is less than,.It was within the scope of Z-direction 180-410mm
Cross area, yield strength 400MPa-1200MPa, from top to bottom, linear change.Range of the Z-direction greater than 410mm is hard area, is bent
Taking intensity is 1200MPa.Specific material property is provided by steel supplier.
With reference to shown in Fig. 2 a and Fig. 2 b, the process and result of yield strength calculating are carried out to B column part in the prior art
It is as follows:
Intensity adjustable part B column is split as hard area, transition region and soft zone according to the variation of intensity first.
By hard area grid division, grid uses deformable shell unit.
Material is assigned to hard area, definition material yield strength is 1200Mpa.
By soft zone grid division, grid uses deformable shell unit.
Material is assigned to soft zone, definition yield strength is 400MPa.
Transition region is fifty-fifty split as to 5 regions, every two adjacent area grid conode as far as possible.Knot after fractionation
Structure is as shown in Figure 2 a.
From soft to hard, assign material to transition region each section, the yield strength of material be followed successively by 540MPa, 670MPa,
800MPa,930MPa,1060MPa.The curve of yield strength after calculating is as shown in Figure 2 b.
Between hard area and transition region, transition region and soft zone, grid conode.
It is also that B column strengthening version is above-mentioned when being connect with other parts such as B column inner panel, side-wall outer-plate by bolt, solder joint etc.
Seven parts are separately connected.
The modeling method of the prior art and the calculating process of yield strength have the defects that as follows:
1) in the modeling process of the prior art, part is really split as soft zone, transition region and three, hard area part point
It carry out not finite element modeling.When being related to the adjustment of transition zone ranges, need again to soft zone, transition region and hard area respectively into
Row modeling, process is sufficiently complex, computationally intensive.And with B column inner panel, side-wall outer-plate by bolt, solder joint etc. other
When component is attached, need respectively to calculate the model of three finite element modelings, calculation amount is very big.Due to being ground in new car
The frequency that hair step transition area and the components connected are adjusted is very high, therefore the modeling process of the prior art is very multiple
It is miscellaneous, need very big calculation amount.
2) the yield strength calculating process of the prior art to yield strength curve be not continuous, but ladder-like
, yield strength is fixed in each ladder.The prior art simulates transition with a series of ladder in transition region
The yield strength in area changes.But yield strength variation of the actual components in transition region is continuously linear.The prior art
It can not the actual yield strength variation of accurate response.Although linear change can be simulated by way of increasing ladder density
Change, but increase ladder density to mean to carry out transition region finer and closely woven division, bigger calculation amount is needed, so that whole build
Mold process is more complicated.
Summary of the invention
The present invention is directed to propose a kind of finite element modeling method of new intensity adjustable material, carries out Holistic modeling to part,
And yield strength is calculated in a continuous manner.
An embodiment according to the present invention proposes a kind of finite element modeling method of intensity adjustable material, comprising:
Finite element modeling step carries out Global Finite Element Model to the part of intensity adjustable material, and grid use therein can
Deform shell unit；
Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate；
Yield strength calculates step, in three-dimensional coordinate, calculates yield strength according to the change direction of the strength of materials, described
Yield strength is in three-dimensional coordinate, the consecutive variations according to spatial position.
In one embodiment, the strength of materials of the part of intensity adjustable material changes in one-dimensional direction, and yield strength is
Along the continuous curve of the dimension direction change.
In one embodiment, the part of intensity adjustable material forms soft zone, hard area and transition region, transition in one-dimensional direction
Between soft zone and hard area, the yield strength in hard area is greater than the yield strength of soft zone in area, and the yield strength of transition region gradually becomes
Change, is gradually changed by the yield strength of soft zone to the yield strength in hard area.
In one embodiment, the yield strength of the soft zone of the part of intensity adjustable material, hard area and transition region calculates as follows:
Wherein, σ1For the yield strength of soft zone, σ2For the yield strength in hard area, l1It is transition region close to the sky of soft zone one end
Between position, l2It is transition region close to the spatial position of hard area one end, x is the spatial position of specified point in transition region, and σ is transition region
The yield strength of middle specified point.
In one embodiment, the finite element modeling method of the intensity adjustable material, further includes: mechanical property parameters setting step
Suddenly, the mechanical property parameters of the part of intensity adjustable material are set.
In one embodiment, mechanical property parameters value be provided that elastic modulus E=206Mpa, Poisson's ratio 0.3,
Density is 7.85E-6kg/mm3。
The finite element modeling method of intensity adjustable material of the invention can effectively simplify the modeling procedure of intensity adjustable part, modeling
Time can save 80%.In addition in contrast to the step curve of classical resolution method, the present invention is used in the yield strength of transition region
Full curve, accuracy can be improved 30%.
Detailed description of the invention
The above and other feature of the present invention, property and advantage will pass through description with reference to the accompanying drawings and examples
And become apparent, identical appended drawing reference always shows identical feature in the accompanying drawings, in which:
Fig. 1 discloses the finite element model of the B column part of intensity adjustable material.
Fig. 2 a and Fig. 2 b disclose the mistake for carrying out yield strength calculating to the B column part of intensity adjustable material in the prior art
Journey.
Fig. 3 a and Fig. 3 b disclose the B column in embodiment finite element modeling method according to the present invention to intensity adjustable material
The process of part progress yield strength calculating.
Fig. 4 discloses the finite element model of the A column part of intensity adjustable material.
Fig. 5 disclose in embodiment finite element modeling method according to the present invention to the A column part of intensity adjustable material into
The process that row yield strength calculates.
Specific embodiment
The finite element modeling method of intensity adjustable material of the invention comprises the following steps that
Finite element modeling step carries out finite element modeling to the part of intensity adjustable material, and grid therein uses deformable
Shell unit；
Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate；
Yield strength calculates step, in three-dimensional coordinate, calculates yield strength according to the change direction of the strength of materials, described
Yield strength is in three-dimensional coordinate, the consecutive variations according to spatial position.
In one embodiment, this method further include:
The mechanical property parameters of the part of intensity adjustable material are arranged in mechanical property parameters setting steps.
For example, mechanical property parameters value is provided that elastic modulus E=206Mpa, Poisson's ratio 0.3, density are
7.85E-6kg/mm3。
Current stage, the part of intensity adjustable material are mainly A column and B column, and the main structure of A column is along X to one-dimensional extension,
The main structure of B column is along the one-dimensional extension of Z-direction.Therefore, the strength of materials of the part of intensity adjustable material is mainly in one-dimensional square
Upper variation, for example be along X to variation for A column, it for B column is changed along Z-direction.Then, present invention letter in many applications
The variation for turning to the strength of materials is along one-dimensional square, correspondingly, the curve of yield strength is the company along the dimension direction change
Continuous curve.
For the part that strength of materials variation is along one-dimensional square, the part of intensity adjustable material forms soft in one-dimensional direction
Area, hard area and transition region, for transition region between soft zone and hard area, the yield strength in hard area is greater than the yield strength of soft zone, mistake
The yield strength for crossing area gradually changes, and is gradually changed by the yield strength of soft zone to the yield strength in hard area.
Below by taking the A column of intensity adjustable material and B column as an example, illustrate the detailed process of finite element modeling method of the invention.
With reference to shown in Fig. 3 a, the B column part of intensity adjustable material shown in Fig. 3 a is identical as part shown in FIG. 1, but the two
Modeling process it is different.The prior art of Fig. 1 is to model respectively after dividing, and method of the invention shown in Fig. 3 a is whole builds
Mould.Assuming that the parameter of the B column part of intensity adjustable material is as follows: length unit is millimeter, and in world coordinates, B column Z-direction is less than
It is soft zone, yield strength 400MPa within the scope of 180mm.It is transition region within the scope of Z-direction 180-410mm, yield strength is
400MPa-1200MPa, from top to bottom, linear change.Range of the Z-direction greater than 410mm is hard area, and yield strength is
1200MPa.Specific material property is provided by steel supplier.
Finite element modeling method according to the present invention, comprises the following steps that
Finite element modeling step carries out Global Finite Element Model to the part of intensity adjustable material.It is whole to the part of B column into
Row grid dividing, grid therein use deformable shell unit.Unlike the prior art, be in the prior art by soft zone,
Transition region and hard area are modeled respectively, then carry out the connection of grid in intersection again.And the present invention be it is whole to part into
Row finite element modeling carries out grid dividing to entire part.
Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate.B column is come
It says, part mainly extends in Z-direction, and the strength of materials is also to change along Z-direction.Therefore strength of materials change direction be determined as (0,0,
1)。
Yield strength calculates step, in three-dimensional coordinate, calculates yield strength according to the change direction of the strength of materials.Surrender
For intensity in three-dimensional coordinate, the consecutive variations according to spatial position form the full curve along respective dimensions.
Specifically, the yield strength calculating of the soft zone of the part of intensity adjustable material, hard area and transition region is as follows:
Wherein, σ1For the yield strength of soft zone, σ2For the yield strength in hard area, l1It is transition region close to the sky of soft zone one end
Between position, l2It is transition region close to the spatial position of hard area one end, x is the spatial position of specified point in transition region, and σ is transition region
The yield strength of middle specified point.
For B column part shown in FIG. 1, actual numerical value is substituted into formula, σ1=400MPa, σ2=1200MPa, l1=
180, l2=410, so the function of the yield strength curve of this B column is as follows:
Fig. 3 b is the yield strength curve for obtain after yield strength calculating to the B column part of intensity adjustable material.Such as figure
Shown in 3b, which is continuous curve in transition region, and yield strength changes with spatial position continuously linear, with
The yield strength variation of practical components is consistent.
If necessary to adjust transition zone position, it is only necessary to update the l in above-mentioned curve1And l2Call by value.
Fig. 4 discloses the finite element model of the A column part of intensity adjustable material.Assuming that the ginseng of the A column part of intensity adjustable material
Number is as follows: length unit is millimeter, and in world coordinates, it is soft zone 102 within the scope of 810mm that A column reinforcement plate X-direction, which is greater than, is bent
Taking intensity is 400MPa.It is transition region 104, yield strength 400MPa-1200MPa, from a left side within the scope of X-direction 650-810mm
To the right side, linear change.Range of the X-direction less than 650mm is hard area 106, yield strength 1200MPa.Specific material property by
Steel supplier provides.
Finite element modeling method according to the present invention, comprises the following steps that
Finite element modeling step carries out Global Finite Element Model to the part of intensity adjustable material.It is whole to the part of A column into
Row grid dividing, grid therein use deformable shell unit.Unlike the prior art, be in the prior art by soft zone,
Transition region and hard area are modeled respectively, then carry out the connection of grid in intersection again.And the present invention be it is whole to part into
Row finite element modeling carries out grid dividing to entire part.
Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate.A column is come
It says, for part mainly in X to extension, the strength of materials is also along X to variation.Therefore strength of materials change direction be determined as (1,0,
0)。
Yield strength calculates step, in three-dimensional coordinate, calculates yield strength according to the change direction of the strength of materials.Surrender
For intensity in three-dimensional coordinate, the consecutive variations according to spatial position form the full curve along respective dimensions.
Specifically, the yield strength calculating of the soft zone of the part of intensity adjustable material, hard area and transition region is as follows:
Wherein, σ1For the yield strength of soft zone, σ2For the yield strength in hard area, l1It is transition region close to the sky of soft zone one end
Between position, l2It is transition region close to the spatial position of hard area one end, x is the spatial position of specified point in transition region, and σ is transition region
The yield strength of middle specified point.
For A column part shown in Fig. 4, actual numerical value is substituted into formula, σ1=400MPa, σ2=1200MPa, l1=
810, l2=650, so the function of the yield strength curve of the stiffening plate of this A column is as follows:
Fig. 5 is the yield strength curve for obtain after yield strength calculating to the A column part of intensity adjustable material.Such as Fig. 5
Shown, which is continuous curve in transition region, and yield strength changes with spatial position continuously linear, with reality
The yield strength variation of border components is consistent.
If necessary to adjust transition zone position, it is only necessary to update the l in above-mentioned curve1And l2Call by value.
The finite element modeling method of intensity adjustable material of the invention can effectively simplify the modeling procedure of intensity adjustable part, modeling
Time can save 80%.In addition in contrast to the step curve of classical resolution method, the present invention is used in the yield strength of transition region
Full curve, accuracy can be improved 30%.
Above-described embodiment, which is available to, to be familiar with person in the art to realize or use the present invention, and is familiar with this field
Personnel can make various modifications or variation, thus this to above-described embodiment without departing from the present invention in the case of the inventive idea
The protection scope of invention is not limited by above-described embodiment, and should meet inventive features that claims are mentioned most
On a large scale.
Claims (6)
1. a kind of finite element modeling method of intensity adjustable material characterized by comprising
Finite element modeling step carries out Global Finite Element Model to the part of intensity adjustable material, and grid therein uses deformable
Shell unit；
Strength of materials change direction determines step, and the change direction of the strength of materials is determined in three-dimensional coordinate；
Yield strength calculates step, in three-dimensional coordinate, calculates yield strength, the surrender according to the change direction of the strength of materials
Intensity is in three-dimensional coordinate, the consecutive variations according to spatial position.
2. the finite element modeling method of intensity adjustable material as described in claim 1, which is characterized in that the part of intensity adjustable material
The strength of materials change in one-dimensional direction, the yield strength is the continuous curve along the dimension direction change.
3. the finite element modeling method of intensity adjustable material as claimed in claim 2, which is characterized in that the part of intensity adjustable material
Soft zone, hard area and transition region are formed in one-dimensional direction, and between soft zone and hard area, the yield strength in hard area is greater than transition region
The yield strength of the yield strength of soft zone, transition region gradually changes, and is gradually changed by the yield strength of soft zone to the surrender in hard area
Intensity.
4. the finite element modeling method of intensity adjustable material as claimed in claim 3, which is characterized in that the part of intensity adjustable material
Soft zone, the yield strength of hard area and transition region calculate it is as follows:
Wherein, σ1For the yield strength of soft zone, σ2For the yield strength in hard area, l1It is transition region close to the space bit of soft zone one end
It sets, l2It is transition region close to the spatial position of hard area one end, x is the spatial position of specified point in transition region, and σ is transition region middle finger
The yield strength of fixed point.
5. the finite element modeling method of intensity adjustable material as described in claim 1, which is characterized in that further include:
The mechanical property parameters of the part of intensity adjustable material are arranged in mechanical property parameters setting steps.
6. the finite element modeling method of intensity adjustable material as claimed in claim 5, which is characterized in that the mechanical property parameters
Value is provided that elastic modulus E=206Mpa, Poisson's ratio 0.3, density 7.85E-6kg/mm3。
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| CN115798654A (en) * | 2023-02-03 | 2023-03-14 | 国家超级计算天津中心 | Model material processing method, device, equipment and medium |
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Application publication date: 20190820 |