CN108897941A - A kind of point corrosion pit Overlapped control method on random pitting attack damage plate - Google Patents
A kind of point corrosion pit Overlapped control method on random pitting attack damage plate Download PDFInfo
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- CN108897941A CN108897941A CN201810657659.2A CN201810657659A CN108897941A CN 108897941 A CN108897941 A CN 108897941A CN 201810657659 A CN201810657659 A CN 201810657659A CN 108897941 A CN108897941 A CN 108897941A
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Abstract
The invention discloses a kind of point corrosion pit Overlapped control methods on random pitting attack damage plate, geometry division are done after generating integral plate geometrical model, using the intersection point of geometric grid as the position for being likely to occur point corrosion pit.Quantity and geometric dimension to point corrosion pit are arranged by parametric method, define the array of two storage point corrosion pit location informations and valid data are written.Element composition point corrosion pit position is randomly selected respectively from the array of storage position information by generating random integers, firstly generate a datum mark, next new point corrosion pit position is sequentially generated, and judges whether meet minimum limit value requirement with the minimum distance of existing point corrosion pit position.If the point effectively if new point corrosion pit is generated in this position, if abandoning the point and again value in vain.There is high efficiency and generality until generating total amount of point corrosion pit, the method for the invention by Do statement control.
Description
Technical field
The present invention relates to a kind of Overlapped control methods, and in particular to one kind automatically controls on random pitting attack damage plate gives birth to
At point corrosion pit do not overlap, it is accurate to control point corrosion pit distribution on Slab for simulating the point corrosion under true environment
Range and be conducive to the control method of grid dividing.
Background technique
Due to itself advantage, the application in all kinds of engineerings increasingly increases steel construction.However steel construction is in use environment
When middle military service, the collective effect of Environmental Water, various gases and other polluters will receive to generate corrosion phenomenon.It is rotten
The generation of erosion will lead to the harm such as the reduction of steel member sectional dimension, strength reduction, ductility decrease.Corrosion of steel structure is ground at present
The application for studying carefully middle finite element model is more universal, and establishing reasonable model is the basis of work of conducting a research.It is with pitting attack damage
Example, more accurately to simulate spot corrosion component, pitting attack damage model applied in document just develops towards random spot corrosion at present.
Relative to uniform spot corrosion model, random spot corrosion model is closer to true component situation.
In the application of random spot corrosion model, since spot corrosion position is by being randomly generated, it is likely to appear in same position
The operation of generation point corrosion pit is executed more than once or adjacent point corrosion pit generating unit divides overlapping phenomenon.This phenomenon is unfavorable for true mould
Quasi- spot corrosion component, while being unfavorable for the grid dividing of model, to reduce the reliability of finite element model.It is therefore necessary to build
The overlapping of point corrosion pit is controlled in mold process.In larger component, pitting attack damage occurs is often some region, is mentioned
A kind of method for being precisely controlled spot corrosion distributed areas is just particularly important out.
Summary of the invention
Present invention generally provides a kind of point corrosion pit Overlapped control methods on random pitting attack damage plate, in random spot corrosion mould
It automatically controls point corrosion pit generated in type not overlap, so that the point corrosion under simulating true environment, it is raw to improve grid
At quality.The range that point corrosion pit is distributed in accurate control integral plate simultaneously.
To reach above-mentioned requirements, the technical scheme adopted by the invention is as follows：
(1) geometry division is done according to the geometric parameter of point corrosion pit after generation integral plate geometrical model in finite element software,
Using the intersection point of geometric grid as the position for being likely to occur point corrosion pit, parametrization is passed through to the quantity N and geometric dimension of point corrosion pit
Method setting, the geometric dimension of point corrosion pit include：Pitting penetration H and spot corrosion radius R；
(2) array LOCX (i), the LOCY (i) of two storage point corrosion pit location informations are defined, and valid data are written；
(3) element composition point corrosion pit is randomly selected from array LOCX (i), LOCY (i) respectively by generating random integers
Position；
(4) datum mark of first point corrosion pit as subsequent judgement is generated；
(5) step (3) remaining raw point corrosion pit position is executed, and judges the minimum distance DIS with existing point corrosion pit position
Whether minimum limit value MIN requirement is met.If the point effectively if new point corrosion pit is generated in this position, if abandoning the point simultaneously in vain
Again value；
(6) it is controlled by Do statement and repeats step (5) until generating total amount of point corrosion pit.
Due to using scheme as above, advantages of the present invention has：
(1) it is controlled automatically at point corrosion pit generated in integral plate not overlap, utmostly restores true spot corrosion structure
Part feature,
(2) it is divided by reasonable geometry, grid dividing quality can be effectively improved；
(3) range that point corrosion pit is distributed in integral plate is accurately controlled, facilitates and geometry mould is adjusted flexibly according to Research Requirements
Type；
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is integral plate geometrical model scale diagrams；
Fig. 3 is that complete slab geomitry divides schematic diagram；
Fig. 4 is that first random point cheats schematic diagram；
Fig. 5 is that all the points cheat schematic diagram；
Fig. 6 is numerical model schematic diagram；
Specific embodiment
It controls point corrosion pit generated by taking certain pitting attack damage plate as an example with embodiment with reference to the accompanying drawing and does not overlap,
Software elaborates to implementation process of the invention using ANSYS：
Method flow is described as follows referring to Fig. 1, specific steps：
(1) integral plate geometrical model is generated in finite element software, the geometric dimension of plate is referring to fig. 2.Institute in the present embodiment
Random range with point corrosion pit radius R is (0.2~0.6), and the random range of depth is (0.01~0.03).According to being randomly generated
Maximum spot corrosion radius R=0.6, determine etc. and to divide spacing ME=1, along integral plate in length and breadth direction by equal part spacing ME spacing etc.
Point, as a result referring to Fig. 3, using the intersection point of geometric grid in Fig. 3 as the position for being likely to occur point corrosion pit.The quantity of point corrosion pit is set
N=5；
(2) one-dimension array LOCX (i) is defined, is used to store abscissa, defined one-dimension array LOCY (i), be used to store vertical
Coordinate.Before effective coordinate is written, the range that point corrosion pit is distributed in integral plate is determined, range such as Fig. 3 of point corrosion pit distribution in this example
Shown in middle a-quadrant.After effective coordinate is written, array LOCX (7)={ 1,2,3,4,5,6,7 }, array LOCY (7)=1,2,3,
4,5,6,7 }；
(3) array LOCX (i) and array LOCY (i) have 7 elements, are generated in range (1~7) by random function
Random number is rounded random number, the abscissa from the corresponding element of the middle taking-up of array LOCX (i) as point corrosion pit central coordinate of circle,
Same method obtains a random integers again and takes out corresponding element from array LOCY (i) as the vertical of point corrosion pit central coordinate of circle
Coordinate；
(4) it by the parameter of query generation it is found that the element obtained for the first time is LOCX (5)=5, LOCY (4)=4, obtains
To the central coordinate of circle (5,4) of first point corrosion pit.First point corrosion pit radius D being randomly generated1=0.22, the first of generation
Point 1001 is generated at a random coordinates (5,4), as the center of circle with radius D1=0.22 generates point corrosion pit, referring to fig. 4；
(5) to reach the nonoverlapping effect of point corrosion pit, MIN=2 is taken to minimum limit value in this example.It is controlled by Do statement
It repeats step (3) and constantly obtains possible point corrosion pit position, during generating the 2nd point corrosion pit, given birth to by inquiry
At parameter it is found that when obtain central coordinate of circle position (4,4) when, judge the center of circle nearest apart from this coordinate for point 1001,
Calculate the distance between 1001 DIS=1 of this coordinate and point.DIS<MIN does not meet minimum limit value requirement, and coordinate is invalid, then
It abandons, return and re-execute the steps (3).When central coordinate of circle position (4,3) of acquisition, judge nearest apart from this coordinate
The center of circle is point 1001, calculates the distance between 1001 DIS=1.414 of this coordinate and point.DIS<MIN does not meet irreducible minimum
Value requires, and coordinate is invalid, then abandons, and returns and re-execute the steps (3).When central coordinate of circle position (2,3) of acquisition, judge
The center of circle nearest apart from this coordinate is point 1001, calculates the distance between 1001 DIS=3.162 of this coordinate and point.
DIS>MIN meets minimum limit value requirement, and coordinate is effective, then new point 1002 is generated in this position, generates spot corrosion as the center of circle
Hole.During generating the 3rd point corrosion pit, when central coordinate of circle position (4,6) of acquisition, judge nearest apart from this coordinate
The center of circle be point 1002, calculate the distance between 1002 DIS=2.236 of this coordinate and point.DIS>MIN meets irreducible minimum
Value requires, and coordinate is effective, then new point 1003 is generated in this position, generates point corrosion pit as the center of circle；
(6) setting Do statement executes that (5-1) is secondary, and remaining point corrosion pit is all generated according to secondary method altogether, and whole point corrosion pits are given birth to
Cheng Hou, pitting attack damage slab geomitry model is referring to Fig. 5；
(7) grid division generates numerical model, and numerical model is referring to Fig. 6.
Claims (7)
1. a kind of point corrosion pit Overlapped control method on random pitting attack damage plate, it is characterised in that include following step：
(1) geometry division is done according to the geometric parameter of point corrosion pit after generation integral plate geometrical model in finite element software, it will be several
The intersection point of what grid passes through parametric method to the quantity N and geometric dimension of point corrosion pit as the position for being likely to occur point corrosion pit
Setting, the geometric dimension of point corrosion pit include：Pitting penetration H and spot corrosion radius R；
(2) array LOCX (i), the LOCY (i) of two storage point corrosion pit location informations are defined, and valid data are written；
(3) element composition point corrosion pit position is randomly selected from array LOCX (i), LOCY (i) respectively by generating random integers；
(4) datum mark of first point corrosion pit as subsequent judgement is generated；
(5) execute step (3) remaining raw point corrosion pit position, and judge with the minimum distance DIS of existing point corrosion pit position whether
Meet minimum limit value MIN requirement.If the point effectively if new point corrosion pit is generated in this position, if abandoning the point and again in vain
Value；
(6) it is controlled by Do statement and repeats step (5) until generating total amount of point corrosion pit；
(7) grid division generates numerical model.
2. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (1)
Described in finite element software generate integral plate geometrical model after according to the geometric parameter of point corrosion pit do geometry division method
It is：
(1) geometry division is done to integral plate geometrical model according to the random range of spot corrosion radius R；
(2) geometry division mode is that equal part spacing ME spacing equal part is pressed in direction in length and breadth along integral plate；
(3) point spacing ME such as guarantee is greater than or equal to the maximum spot corrosion radius R being randomly generated.
3. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (2)
Described in define array LOCX (i), the LOCY (i) of two storage point corrosion pit location informations, and the method that valid data are written is：
(1) point corrosion pit location information is determined by point corrosion pit central coordinate of circle；
(2) one-dimension array LOCX (i) is defined, is used to store abscissa；
(3) one-dimension array LOCY (i) is defined, is used to store ordinate；
(4) valid data being written are：All geometry divide the coordinate in length and breadth of intersection point in the range that point corrosion pit is onboard distributed；
(5) valid data being written are for accurately controlling the range of point corrosion pit distribution in integral plate.
4. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (3)
Described in respectively randomly select element from array LOCX (i), LOCY (i) by generating random integers and form point corrosion pit position
Method is：
(1) random number is generated using random function, and be rounded, random integers range is LOCX (i), element number in LOCY (i)
Range；
(2) array LOCX (i) is taken respectively by the random integers generated, the element in LOCY (i) forms coordinate, and determining may
Generate the central coordinate of circle of point corrosion pit.
5. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (4)
Described in first point corrosion pit of generation as the method for the datum mark of subsequent judgement be：
A random coordinates are directly taken, point is generated, point corrosion pit is generated as the center of circle, is operated without judgement.
6. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (5)
Described in remaining raw point corrosion pit position of execution step (3), and judge and whether the minimum distance DIS of existing point corrosion pit position accords with
Close minimum limit value MIN requirement.If the point effectively if new point corrosion pit is generated in this position, if abandoning the point in vain and taking again
The method of value is：
(1) middle step (3) obtains a point corrosion pit central coordinate of circle according to claim 1；
(2) judge the center of circle nearest apart from this coordinate；
(3) the distance between this coordinate and the nearest center of circle DIS are calculated；
(4) judge to calculate whether resulting distance DIS meets minimum limit value MIN requirement (DIS >=MIN)：If coordinate is effective,
This position generates new point, generates point corrosion pit as the center of circle；If coordinate is invalid, abandon, return and re-executes this item right
Step (1) in it is required that；
(5) minimum limit value MIN refers in this item claim steps (4)：The point corrosion pit being randomly generated does not generate needed for overlapping
Minimum spacing between the adjacent center of circle.
7. point corrosion pit Overlapped control method on random pitting attack damage plate according to claim 1, it is characterised in that：Step (6)
Described in controlled by Do statement and repeat step (5) until the method for generating total amount of point corrosion pit is：
(1) it is secondary to execute (N-1) altogether for Do statement；
(2) loop body content is step (5) in claim 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109918750A (en) * | 2019-02-26 | 2019-06-21 | 安徽理工大学 | A kind of full-automatic modeling method of the erosion of the accurate control points on H profile steel column range |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484489A (en) * | 2014-07-24 | 2015-04-01 | 江苏科技大学 | Automatic generation method for quadrilateral finite element mesh of pitting corrosion damage cylindrical shell |
| CN104834783A (en) * | 2015-05-12 | 2015-08-12 | 江苏科技大学 | Parameterized construction method of numerical model of pit-corrosion-randomly-distributed cylindrical shell |
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- 2018-06-25 CN CN201810657659.2A patent/CN108897941A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484489A (en) * | 2014-07-24 | 2015-04-01 | 江苏科技大学 | Automatic generation method for quadrilateral finite element mesh of pitting corrosion damage cylindrical shell |
| CN104834783A (en) * | 2015-05-12 | 2015-08-12 | 江苏科技大学 | Parameterized construction method of numerical model of pit-corrosion-randomly-distributed cylindrical shell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109918750A (en) * | 2019-02-26 | 2019-06-21 | 安徽理工大学 | A kind of full-automatic modeling method of the erosion of the accurate control points on H profile steel column range |
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Application publication date: 20181127 |