CN114254535A - Automatic fiber laying track layered simulation modeling method suitable for complex revolving body - Google Patents
Automatic fiber laying track layered simulation modeling method suitable for complex revolving body Download PDFInfo
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Abstract
The invention belongs to the technical field of composite material structure design, and particularly relates to an automatic fiber laying track layering simulation modeling method suitable for a complex revolving body. The method fully considers the influence of the distribution difference of the same-angle automatic fiber laying track of the complex revolving body component on simulation modeling caused by the thickness factor of parts in a large curvature area, adopts a layering modeling method of a laying layer to respectively perform grid division and track mapping on each laying layer to generate a single-layer grid information file containing track angles, and then assembles the grid information file containing the track angles of each laying layer into an integral component for simulation modeling through coupling association. The method is characterized in that the paving surface is taken as a unit, the complex area and the large-curvature area of each paving surface are subjected to area division and local grid refinement, accurate simulation modeling is carried out on tow track distribution difference on the paving surface caused by thickness change, and then all paving surface models are combined into entity parts through finite element software, so that the simulation precision of the automatic paving component is ensured.
Description
Technical Field
The invention belongs to the technical field of composite material structure design, and particularly relates to an automatic fiber laying track layering simulation modeling method suitable for a complex revolving body.
Background
With the development of the automatic manufacturing technology of the composite material, the automatic fiber laying process is gradually applied to the composite material members of the airplane, and the fiber laying path is designed due to the deflection of the fiber bundles, the turning of the fiber bundles and the like, compared with the traditional composite material design, the angle of the fiber bundles in the same laying layer is not fixed, so that the finite element modeling method based on the fixed angle is not suitable for the automatic fiber laying composite material members, and particularly for the composite material members with complex revolving body curved surfaces, the difference between the actual laying angle and the theoretical laying angle of the composite material members can greatly influence the accuracy of the mechanical simulation result. In addition, a complex revolving body structure has a large curvature locally, the change of the layering area is caused in the area due to the thickness of a part, so that the distribution of the track of the tows is influenced to a certain extent, and the influence caused by the distribution difference of the track tows is ignored due to the adoption of a neutral surface-based modeling mode in the traditional modeling method, so that extra errors are brought to the analysis result.
In the existing mechanical simulation model modeling method based on automatic wire laying, application date 2020.07.28, application number 202010238110.7, a composite material solidification deformation simulation modeling method based on wire laying track, an ABAQUS model is adopted to generate an INP grid file, then information such as wire laying track angles and the like is mapped into the INP file, a new INP file containing the wire laying track is formed, and then the file is imported into ABAQUS for calculation. In the method, all the layering information is mapped into the same grid model, so that the analysis precision is reduced while the efficiency is improved. However, in the process of processing a member with a certain thickness, the method stretches the two-dimensional grid into a three-dimensional entity grid, neglects the difference influence of the strand track on different paving layers, and easily causes the simulation model to be inconsistent with the real strand track distribution, thereby generating analysis errors.
On application date 2018.07.10, application number 201711167029.9 entitled "simulation analysis method for mechanical properties of automatic filament-laying composite material", a mesoscopic unit cell model is used to simulate a complete automatic filament-laying composite material, the deflection angle of a filament bundle track in the unit cell model is set in advance, and then a theoretical and numerical method is used to calculate the rigidity and strength. The method cannot extract and map the real silk laying track angle in the calculation, and cannot meet the actual requirements of engineering.
Therefore, aiming at the defects of the method, the method provides the automatic fiber-laying track layering simulation modeling method suitable for the complex revolving body, fully considers the influence of the distribution difference of the same-angle automatic fiber-laying track of the complex revolving body component in a large curvature area caused by the thickness factor of parts on the simulation modeling, adopts the method of layering modeling of the layer surfaces, respectively carries out grid division and track mapping on each layer surface to generate a single-layer grid information file containing track angles, and then assembles the grid information file containing the track angles of each layer surface into an integral component for simulation modeling through coupling association. The modeling method takes the laying surface as a unit, carries out area division and local grid refinement on a complex area and a large-curvature area of each laying surface, carries out accurate simulation modeling on the distribution difference of the tow tracks on the laying surface caused by the thickness change, and then combines all laying surface models into a solid part through finite element software, thereby ensuring the finite element simulation precision of the automatic laying component.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an accurate method capable of meeting the simulation modeling of the automatic fiber laying track of a complex revolving body.
The technical scheme of the invention is as follows: in order to achieve the purpose, the automatic fiber laying track layered simulation modeling method suitable for the complex revolving body mainly comprises the following steps:
step 1: guiding the film pasting surface of the part and all paving layer tow track curves into the CATIA;
step 2: in CATIA software, deviating the part film surface along the layering direction, wherein the deviation thickness is the thickness of a single-layer layering, and creating the layering surfaces of all the layering by using the method;
and step 3: in CATIA software, projecting a tow track curve corresponding to each layer to the corresponding layer created in the step 2;
and 4, step 4: dividing regions in a complex paving layer according to the curved surface characteristics, respectively meshing each paving layer by adopting a CATIA self-carried meshing tool, exporting a dat file containing paving layer meshing information in the CATIA, wherein the file comprises coordinate values of all grid nodes, and repeating the process until exporting the dat files of all paving layers;
and 5: importing the dat file containing the layering grid information generated in the step 4 into automatic fiber paving software, mapping the tow track information of the layering into the dat file, outputting an inp file in a finite element input format by using an export function of the automatic fiber paving software, and outputting the inp files of all the layering layers according to the method;
step 6: importing the inp files of all the paved layers generated in the step 5 into ABAQUS software, and binding all the paved layers into an integral laminated plate model by adopting tie connection or other coupling modes;
and 7: in ABAQUS, calculations are made assigning material properties and creating boundary conditions and loads.
In order to better implement the method of the present invention, further, in step 1, the automatic fiber placement trajectory planning and designing software is a design software necessary for manufacturing the composite material part by using an automatic fiber placement device, and can implement fiber placement trajectory planning according to the structural characteristics of the composite material part, and the reference curved surface of the generated trajectory is consistent with the part film attaching surface or the layer of laying.
In order to better implement the method, further, the deviation of the veneering film surface in the step 2 can be deviated by a multiple of the thickness of the single-layer, so that the modeling efficiency is improved.
In order to better implement the present invention, further, if the bedding plane is shifted by using multiple of the thickness of the single-layer bedding layer in step 2, all the angle tracks between the two bedding planes need to be projected and divided into regions in step 3.
In order to better implement the present invention, further, in step 3, the typical region may be divided according to the curved surface characteristics, and may be divided according to the curved surface size.
In order to better implement the present invention, further, in step 3, the boundary line for dividing the typical area is selected from the projected trajectory line of the bedding surface, and if the trajectory line cannot cut the curved surface, the boundary line may be manually increased.
In order to better implement the present invention, further, in step 4, the dat file is automatically generated for the CATIA gridding tool, and includes coordinate information of each node and coordinate information of a cell, which are gridded, and is generally a four-side cell.
In order to better implement the present invention, further, in step 5, the inp file is automatically generated for automatic fiber placement software, and the automatic fiber placement design software generally includes this function or similar functions.
In order to better implement the present invention, further, in step 6, the inp files of all layers are sequentially imported into the ABAQUS software, and Tie or other means are used to perform interlayer node-to-node coupling.
The invention has the beneficial effects that:
(1) the method fully considers the influence of the angle change of the automatic wire laying track and the thickness change of the part in the large-curvature area on simulation modeling, and improves the modeling precision of the automatic wire laying part with the complex curved surface by adopting a layered modeling method of a laying surface;
(2) compared with the prior art, in the invention, the model appearance curved surface, the mesh division and the generation of the tow track data are all implemented in CATIA software with stronger visualization, so that the model change iteration efficiency can be obviously improved, and the output data compatibility is stronger.
(3) In the invention, the mapping of the automatic wire laying track data can be finished by adopting a CATIA secondary development tool or other programs and algorithms without depending on automatic wire laying software.
(4) The invention can truly and accurately reflect the angle change of the automatic fiber laying track, adopts different grid sizes among different partitions and gives consideration to the analysis efficiency and precision;
(5) the method can be applied to mechanical property analysis and solidification deformation analysis of a complex revolving body structure, and has high engineering practical value.
Drawings
FIG. 1 is a flowchart of a method according to a first embodiment of the present invention
FIG. 2 is a schematic diagram of a tow trajectory mapping method according to an embodiment of the present invention
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
an automatic fiber laying track layering simulation modeling method suitable for a complex revolving body is shown in figure 1 and mainly comprises the following steps;
step 1: guiding the film pasting surface of the part and the tow track curve into the CATIA;
step 2: in CATIA software, deviating the part film surface along the layering direction, wherein the deviation thickness is the thickness of a single-layer layering, and creating the layering surfaces of all the layering by using the method;
and step 3: in CATIA software, projecting a wire laying track curve corresponding to each layer to the layer created in the step 2;
and 4, step 4: selecting typical areas, such as an edge area and a flat area, on the paving surface created in the step 2, and selecting the projection trajectory of the paving layer in the step 3 as an area boundary according to the typical areas near the area boundary, and performing area division on the paving surface. The divided areas are subjected to gridding division and combination by adopting a CATIA self-carried gridding division tool, and a paving plane dat file containing gridding information is exported from the CATIA;
and 5: and (4) importing the dat file containing the layering grid information generated in the step (4) into automatic fiber paving software, mapping the tow track information of the layering into the dat file, outputting an inp file by using an export function of the automatic fiber paving software, and outputting the inp files of all the layering layers according to the method, wherein the method mainly comprises the following steps.
Step 5.1, calculating the coordinate value of the grid center point P according to the coordinate value of each grid node in the dat file, as shown in FIG. 2;
step 5.2 projecting the central point of the mesh onto the nearest trajectory curve, as shown in FIG. 2, finding the projected point P’A tangent t at the trajectory line;
step 5.3, calculating the angle between the vector t and the coordinate axis under the overall coordinate system, and recording as theta;
step 5.4, adding a row after each grid node coordinate in the dat file, and writing the value of theta;
and 5.5, converting the dat file into an inp format suitable for finite element ABAQUS operation and outputting the inp format.
Step 6: importing inp files of all the paved layers generated in the step 5 into ABAQUS software, and binding all the paved layers into an integral laminated plate model by adopting tie connection or other coupling modes.
And 7: in ABAQUS, calculations are made assigning material properties and creating boundary conditions and loads.
In the embodiment, each layer of paving surface and the tow track thereof are accurately corresponding to the simulation model, so the method is particularly suitable for simulation modeling of the complex curved surface revolving body, and can accurately reflect the tow arrangement of a local large-curvature area to the model, thereby improving the simulation precision.
Example 2:
this example was optimized based on example 1. The starting point is that in the embodiment 1, if the number of the layers of the model is large, the modeling workload is increased by adopting the layer-by-layer modeling mode. Therefore, in order to improve the modeling efficiency, in this embodiment, a interlayer modeling manner is adopted, that is, the paving surfaces of 4 adjacent layers are merged, and the tow tracks of four layers are all projected onto one paving surface for modeling. The specific implementation steps are as follows:
step 1: guiding the film pasting surface of the part and the tow track curve into the CATIA;
step 2: in the CATIA software, the part overlay surface was deviated in the ply lay direction by a thickness of four times the thickness of a single ply, and the remaining plies were created in this way. The number of layers created in this way will be significantly reduced compared to the embodiment.
And step 3: and in CATIA software, projecting a wire laying track curve with a corresponding angle onto the laying surface created in the step 2, wherein the laying tracks on two adjacent sides of the generated laying surface are projected onto the laying surface.
And 4, step 4: selecting typical areas, such as an edge area and a flat area, on the paving surface created in the step 2, and selecting a 0-degree projection trajectory of the paving layer in the step 3 as an area boundary according to the typical areas near the area boundary, and performing area division on the paving surface. And carrying out gridding division on each divided region by adopting a CATIA self-carried gridding division tool, and exporting a paving plane/dat file containing gridding information in the CATIA after merging.
And 5: and (4) importing the dat file containing the layering grid information generated in the step (4) into automatic fiber paving software, mapping the tow track information of four layers of adjacent upper and lower layers of the layering into the dat file, outputting an inp file by using an export function of the automatic fiber paving software, and outputting the inp files of all the layering layers according to the method. The inp file derived in this way has track information for 4 plies.
Step 6: importing inp files of all the paved layers generated in the step 5 into ABAQUS software, and binding all the paved layers into an integral laminated plate model by adopting tie connection or other coupling modes.
And 7: in ABAQUS, calculations are made assigning material properties and creating boundary conditions and loads.
In the embodiment, because part of the paving layers are combined, a large amount of modeling work is reduced, and the simulation precision and efficiency can be considered by adopting the steps of the embodiment on the occasions that the curved surface is relatively flat and the precision requirement is not high.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An automatic fiber laying track layering simulation modeling method suitable for a complex revolving body is characterized by comprising the following steps:
step 1: guiding the film pasting surface of the part and the tow track curve into the CATIA;
step 2: in CATIA software, deviating the part film surface along the layering direction, wherein the deviation thickness is the thickness of a single-layer layering, and creating the layering surfaces of all the layering by using the method;
and step 3: in CATIA software, projecting a wire laying track curve corresponding to each layer to the layer created in the step 2;
and 4, step 4: selecting a typical area on the paving layer created in the step 2, and selecting the projection trajectory of the paving layer in the step 3 as an area boundary according to the typical area near the area boundary to divide the paving layer into areas; adopting a CATIA (computer-aided three-dimensional interactive application) self-carried meshing tool to perform meshing and merging on each divided region, exporting paving planes containing mesh information in the CATIA, and repeating the process until the dat files of all the paving planes are exported;
and 5: importing the dat file containing the layering grid information generated in the step 4 into automatic fiber paving software, mapping the tow track information of the layering into the dat file, outputting an inp file by using an export function of the automatic fiber paving software, and outputting the inp files of all the layering layers according to the method;
step 6: importing the inp files of all the paved layers generated in the step 5 into ABAQUS software, and binding all the paved layers into an integral laminated plate model by adopting tie connection or other coupling modes;
and 7: in ABAQUS, calculations are made assigning material properties and creating boundary conditions and loads.
2. The method for modeling the automatic laying track layering simulation suitable for the complex revolving body according to claim 1, wherein the laying track curve in the step 1 is generated by automatic laying software and generally comprises 4 theoretical laying angle values.
3. The method for modeling by means of automatic fiber placement trajectory layering simulation suitable for a complex revolving body according to claim 1, wherein the deviation of the veneering film surface in the step 2 can be deviated by a multiple of the thickness of a single-layer.
4. The method for modeling the automatic fiber-laying track layering simulation suitable for the complex revolution body according to claim 3, wherein in the step 2, if the layer surface is shifted by a multiple of the thickness of the single-layer, in the step 3, all the angle tracks between the two layer surfaces need to be projected and divided into areas.
5. The method for modeling the automatic fiber-laying track layering simulation suitable for the complex revolution body according to claim 1, wherein in the step 3, the typical region can be divided according to the characteristics of the curved surface or according to the size of the curved surface.
6. The method for modeling the automatic laying wire track of the complex revolving body according to claim 1, wherein in the step 3, the boundary line of the typical area during the dividing is selected from the projected trajectory lines of the laying surface, and if the trajectory lines cannot cut the curved surface, the boundary line can be manually increased.
7. The method for modeling the automatic wire laying track layering simulation suitable for the complex revolving body according to claim 1, wherein in the step 4, the dat file is automatically generated for a CATIA gridding tool and includes each node coordinate information and unit coordinate information of gridding.
8. The method for modeling by means of automatic filament-laying track layering simulation suitable for the complex revolving body according to claim 1, wherein in the step 5, an inp file is automatically generated for automatic filament-laying software.
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