CN108984853A - The non-homogeneous isomery cell structure design method mutually coordinated with principal stress trajectory line - Google Patents
The non-homogeneous isomery cell structure design method mutually coordinated with principal stress trajectory line Download PDFInfo
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- CN108984853A CN108984853A CN201810652757.7A CN201810652757A CN108984853A CN 108984853 A CN108984853 A CN 108984853A CN 201810652757 A CN201810652757 A CN 201810652757A CN 108984853 A CN108984853 A CN 108984853A
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- 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
The present invention relates to a kind of non-homogeneous isomery cell structure design methods mutually coordinated with principal stress trajectory line, and this method comprises the following steps: (1) the principal stress trajectory line of part is obtained according to part specified load and prime area；(2) determine that the non-homogeneous isomery cell structure of part coordinated therewith, the non-homogeneous isomery cell structure are member structure according to principal stress trajectory line.Compared with prior art, the present invention is based on principal stress trajectory line, in conjunction with cell structure design criteria, replaces entity structure with born of the same parents' shape knot, is realizing that part is light-weighted while improving its mechanical performance, so that design of part is more efficient and rational.
Description
Technical field
The present invention relates to increases material manufacturing technology field, more particularly, to it is a kind of mutually coordinate with principal stress trajectory line it is non-homogeneous
Isomery cell structure design method.
Background technique
As increasing material manufacturing (Additive manufacturing, AM) technology is turned from manufacturing " prototype " to manufacture " part "
Become, demand emphasis is by " geometry " steering " performance ".In material increasing field, most of design of part designed at present
All be uniformly, isomorphism, do not fully consider the operating condition force flow characteristic in part use process, resulting structure not enough efficiently,
Rationally.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of and principal stress trajectories
The non-homogeneous isomery cell structure design method that line is mutually coordinated.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of non-homogeneous isomery cell structure design method mutually coordinated with principal stress trajectory line, this method include following step
It is rapid:
(1) the principal stress trajectory line of part is obtained according to part specified load and prime area；
(2) the non-homogeneous isomery cell structure of part coordinated therewith is determined according to principal stress trajectory line, described is non-homogeneous
Isomery cell structure is member structure.
The principal stress trajectory line is two-dimentional principal stress trajectory line.
Step (1) specifically:
(11) finite element analysis is carried out to part according to specified load and prime area, the node for obtaining each unit is answered
Power；
(12) starting point for selecting principal stress trajectory line is drawn since the starting point of selection according to the stress distribution of each node
Principal stress trajectory line, the corresponding principal stress trajectory line of each starting point.
Step (12) specifically:
Since unit where the starting point of selection, according to the continuous stress of stress distribution generation unit of each unit interior joint
Trajectory line segment, the continuous stress trajectory segment of unit for splicing each unit generate principal stress trajectory line.
Step (2) specifically:
(21) the initial member structure of part is established, the intersection point of rod piece is any two masters in the initial member structure
The intersection point of stress trajectory；
(22) a certain target rod piece in initial member structure is chosen, is selected the smallest with the target rod piece registration error
Principal stress trajectory line；
(23) farthest principal stress trajectory line intersection point with a distance from target rod piece is found on selected principal stress trajectory line, selected
Surely it is new principal stress trajectory line by the principal stress trajectory line of the intersection point, determines new principal stress trajectory line and other principal stresses
The intersection point of trajectory line is new intersection point；
(24) target rod piece is finely divided according to new intersection point and obtains new member structure and replaces target rod piece；
(25) it selectes new target rod piece and repeats the continuous iteration of step (22)-(24) progress until meeting termination item
Part；
(26) on the basis of step (25), it is that constraint condition progress is dimensionally-optimised with stress or displacement, determines each rod piece
Diameter, complete the non-homogeneous isomery cell structure of part design.
Termination condition in step (25) is the error permission of the non-homogeneous isomery cell structure of part and principal stress trajectory line
Within the scope of or reach the number of iterations of setting.
Compared with prior art, the present invention has the advantage that the present invention is with the force flow of the part under specific force environment
Based on feature (principal stress trajectory line), in conjunction with cell structure design criteria, entity structure is replaced with born of the same parents' shape knot, is realizing part
It is light-weighted while improving its mechanical performance, so that design of part is more efficient and rational.
Detailed description of the invention
Fig. 1 is the overall flow block diagram of the non-homogeneous isomery cell structure design method of the present invention；
Fig. 2 is the embodiment schematic diagram of the non-homogeneous isomery cell structure design method of the present invention；
Fig. 3 is the flow diagram that main stress trajectory generates；
Fig. 4 is the embodiment schematic diagram that main stress trajectory generates；
Fig. 5 is the flow diagram that cell structure generates；
Fig. 6 is the embodiment schematic diagram that cell structure generates.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Note that the following embodiments and the accompanying drawings is said
Bright is substantial illustration, and the present invention is not intended to be applicable in it object or its purposes is defined, and the present invention does not limit
In the following embodiments and the accompanying drawings.
Embodiment
As shown in Figure 1, a kind of non-homogeneous isomery cell structure design method mutually coordinated with principal stress trajectory line, this method
Include the following steps:
(1) the principal stress trajectory line of part, this method study two-dimensional knot are obtained according to part specified load and prime area
Structure, i.e. the part principal stress trajectory line of study two-dimensional, corresponding principal stress trajectory line are two-dimentional principal stress trajectory line.Fig. 2 (a) is
The present embodiment part specified load, Fig. 2 (b) are the principal stress trajectory line for the part that the present embodiment obtains.
(2) the non-homogeneous isomery cell structure of part coordinated therewith is determined according to principal stress trajectory line, this method is studied
Cell structure be grating texture, specifically, non-homogeneous isomery cell structure be member structure, Fig. 2 (c) be the present embodiment part
Non-homogeneous isomery cell structure.
As shown in figure 3, step (1) obtains the principal stress of part by finite element analysis according to specified load and prime area
Numerical information and directional information generate the principal stress trajectory line of part according to these information.Specified load and prime area are roots
Simplified and next according to actual working conditions.Its specific method is:
(11) finite element analysis is carried out to part according to specified load and prime area, the node for obtaining each unit is answered
Power, however the stress intensity of finite element analysis software acquisition and direction result are all discrete.It is utilized and is inserted based on these discrete points
Value method constructs sequential cells stress field, as shown in Fig. 4 (a)；
(12) starting point for selecting principal stress trajectory line is drawn since the starting point of selection according to the stress distribution of each node
Principal stress trajectory line, the corresponding principal stress trajectory line of each starting point.Specifically: since unit where the starting point of selection, root
According to the continuous stress trajectory segment of the stress distribution generation unit of each unit interior joint, the continuous stress trajectory segment of unit is such as
Shown in Fig. 4 (b), the continuous stress trajectory segment of unit for splicing each unit generates principal stress trajectory line, and principal stress trajectory line is such as
Shown in Fig. 4 (c).
In step (11), in finite element analysis, the division of different units, obtained principal stress information can not yet
Together, and then the principal stress trajectory line of generation also can difference, such as the density degree meeting of finally obtained principal stress trajectory line
It is different.The selection of step (12) starting point is also to carry out selection according to actual needs, and starting point number determines principal stress trajectory line
Item number, also further influence principal stress trajectory line density degree.
As shown in figure 5, step (2) specifically:
(21) the initial member structure of part, initial bar are established according to the obligatory point of structure, geometry, load position
The intersection point of rod piece is the intersection point of any two principal stress trajectory lines in part structure, and the difference that initial member structure is chosen will lead to
The non-homogeneous isomery cell structure of final part difference；Principal stress trajectory line selection as shown in Fig. 6 (a) according to part takes just
Beginning member structure, shown in the initial member structure such as Fig. 6 (b) selected in the present embodiment；
(22) a certain target rod piece in initial member structure is chosen, is selected the smallest with the target rod piece registration error
Principal stress trajectory line；
(23) farthest principal stress trajectory line intersection point with a distance from target rod piece is found on selected principal stress trajectory line, selected
Surely it is new principal stress trajectory line by the principal stress trajectory line of the intersection point, determines new principal stress trajectory line and other principal stresses
The intersection point of trajectory line is new intersection point；
(24) target rod piece is finely divided according to new intersection point and obtains new member structure and replaces target rod piece；
(25) it selectes new target rod piece and repeats the continuous iteration of step (22)-(24) progress until meeting termination item
Part；
(26) on the basis of step (25), it is that constraint condition progress is dimensionally-optimised with stress or displacement, determines each rod piece
Diameter, complete the non-homogeneous isomery cell structure of part design.
Termination condition in step (25) is the error permission of the non-homogeneous isomery cell structure of part and principal stress trajectory line
Within the scope of or reach the number of iterations of setting.If Fig. 6 (c) is the intermediate part cell structure generated, by continuous iteration
It updates, shown in the non-homogeneous isomery cell structure such as Fig. 6 (d) of the part of final design.
This method completes the manufacture of part cell structure using extruded type increasing material manufacturing technique in specific embodiment,
The preparation of part is realized in the present embodiment using parallel connection FDM 3D printer.
Above embodiment is only to enumerate, and does not indicate limiting the scope of the invention.These embodiments can also be with other
Various modes are implemented, and can make in the range of not departing from technical thought of the invention it is various omit, displacement, change.
Claims (6)
1. a kind of non-homogeneous isomery cell structure design method mutually coordinated with principal stress trajectory line, which is characterized in that this method
Include the following steps:
(1) the principal stress trajectory line of part is obtained according to part specified load and prime area；
(2) the non-homogeneous isomery cell structure of part coordinated therewith, the non-homogeneous isomery are determined according to principal stress trajectory line
Cell structure is member structure.
2. a kind of non-homogeneous isomery cell structure design side mutually coordinated with principal stress trajectory line according to claim 1
Method, which is characterized in that the principal stress trajectory line is two-dimentional principal stress trajectory line.
3. a kind of non-homogeneous isomery cell structure design side mutually coordinated with principal stress trajectory line according to claim 1
Method, which is characterized in that step (1) specifically:
(11) finite element analysis is carried out to part according to specified load and prime area, obtains the node stress of each unit；
(12) starting point for selecting principal stress trajectory line is drawn master according to the stress distribution of each node and is answered since the starting point of selection
Power trajectory line, the corresponding principal stress trajectory line of each starting point.
4. a kind of non-homogeneous isomery cell structure design side mutually coordinated with principal stress trajectory line according to claim 3
Method, which is characterized in that step (12) specifically:
Since unit where the starting point of selection, according to the continuous stress trajectory of stress distribution generation unit of each unit interior joint
Line segment, the continuous stress trajectory segment of unit for splicing each unit generate principal stress trajectory line.
5. a kind of non-homogeneous isomery cell structure design side mutually coordinated with principal stress trajectory line according to claim 1
Method, which is characterized in that step (2) specifically:
(21) the initial member structure of part is established, the intersection point of rod piece is any two principal stresses in the initial member structure
The intersection point of trajectory line；
(22) a certain target rod piece in initial member structure is chosen, it is selected to be answered with the smallest master of target rod piece registration error
Power trajectory line；
(23) farthest principal stress trajectory line intersection point with a distance from target rod piece is found on selected principal stress trajectory line, selectes warp
The principal stress trajectory line for crossing the intersection point is new principal stress trajectory line, determines new principal stress trajectory line and other principal stress trajectories
The intersection point of line is new intersection point；
(24) target rod piece is finely divided according to new intersection point and obtains new member structure and replaces target rod piece；
(25) it selectes new target rod piece and repeats step (22)-(24) continuous iteration of progress until meeting termination condition；
(26) on the basis of step (25), it is that constraint condition progress is dimensionally-optimised with stress or displacement, determines the straight of each rod piece
Diameter completes the design of the non-homogeneous isomery cell structure of part.
6. a kind of non-homogeneous isomery cell structure design side mutually coordinated with principal stress trajectory line according to claim 5
Method, which is characterized in that the termination condition in step (25) is the mistake of part non-homogeneous isomery cell structure and principal stress trajectory line
Within poor allowed band or reach the number of iterations of setting.
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| CN110103474A (en) * | 2019-04-04 | 2019-08-09 | 同济大学 | A kind of part biomimetic features increasing material manufacturing method based on stress regulation and control |
| CN112182806A (en) * | 2020-10-20 | 2021-01-05 | 同济大学 | Force flow guided mesostructure design method |
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| CN109858133A (en) * | 2019-01-25 | 2019-06-07 | 北京航空航天大学 | A kind of lattice structure design and optimization method based on stress mapping |
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| CN112182806A (en) * | 2020-10-20 | 2021-01-05 | 同济大学 | Force flow guided mesostructure design method |
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