CN115795971A - Grid generation method, device and equipment suitable for fatigue crack propagation analysis of complex welding structure - Google Patents
Grid generation method, device and equipment suitable for fatigue crack propagation analysis of complex welding structure Download PDFInfo
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Abstract
The invention discloses a grid generation method, a device and equipment suitable for complex welding structure fatigue crack propagation analysis, and aims to meet the requirement of high-precision numerical simulation on grid division in complex welding structure fatigue crack propagation. The method comprises the following steps: step 1, importing a geometric model of a complex welding structure, and constructing a refined fatigue crack propagation calculation model. And 2, performing self-adaptive mesh division based on the geometric information of the fatigue crack propagation calculation model of the complex welding structure. And 3, constructing a core 'step type' grid through a rapid intersection algorithm of the grid and the solid model boundary. And 4, fitting the grid nodes to the solid model boundary by using a geometric feature approximation method and a proximity feature template method. And 5, improving the quality of the final grid by a geometric position optimization and unit topology decomposition method and the like. And 6, constructing a multi-core grid parallel generator to realize the automatic generation of the unstructured grid. The invention has the advantages of less man-machine interaction in the automatic grid division process, high grid generation efficiency and high quality, and can realize high-quality grid division of any complex crack propagation model.
Description
Technical Field
The invention relates to the field of geometric modeling and grid division of numerical simulation pretreatment, in particular to a grid generation algorithm, a device and equipment for rapid fatigue crack propagation analysis of a complex welding structure.
Background
The basic assumptions of the traditional strength theory are uniformity, continuity, isotropy, full elasticity, small deformation, etc., which is not the case in most engineering practices, and the defects of cracks, holes, slag inclusions, etc. in complex welded structures are naturally occurring. According to the relativity defined by the crack size, once the initial defect containing the crack is assumed in the material, the traditional strength theory is not applicable. The problem of fatigue failure of a complex welding structure is a mechanical problem, the fracture mechanics theory considers the processes of fatigue crack initiation, expansion and final unstable fracture on the premise of an initial crack or a defect existing in a mechanical structure, and high-precision fatigue crack expansion simulation is closely related to the grid generation quality.
For the grid division of the fatigue crack propagation of the complex welding structure, grid generation strategies such as a Delaunay method, a propelling wave front method, a cross-tree subdivision method and the like are generally adopted, wherein a tetrahedral grid division method is taken as a main method, and the calculation precision and the algorithm complexity are low. When fatigue crack propagation analysis is performed on a complex welding structure, high-quality meshing is the basis for obtaining accurate calculation results, and at present, some commercial meshing software, such as Gridgen, ICEMCFD, pointwise and the like, has poor meshing automation and low meshing quality at crack generation tips and propagation paths, and a large number of manual operations exist, even causing meshing failure. Therefore, the method has important significance for researching the non-structural grid division of the fatigue crack propagation analysis in the complex welding structure.
Disclosure of Invention
Aiming at the difficult problem of grid division of a fatigue fracture calculation model containing any fine characteristics, the invention aims to provide a rapid and automatic unstructured grid generation algorithm for fatigue crack propagation of a complex welding structure. According to the real morphology characteristics of the fracture surface, a proximity characteristic template suitable for crack propagation analysis is established, high-quality grid division of a complex welding structure is achieved, and the method can be used for strength, rigidity, fatigue life analysis, optimization design and other numerical calculations of the complex welding structure.
In order to achieve the above object, embodiments of the present invention provide a method, an apparatus, and a device for generating a non-structural grid suitable for fatigue crack propagation analysis of a complex welding structure, where the method, the apparatus, and the device realize automatic grid division by constructing a geometric data acquisition module, a grid parameter setting module, an automatic grid division module, a rapid grid intersection module, an entity boundary processing module, a quality evaluation optimization module, and a data storage update module, and include the following steps:
(1) Introducing a geometric model of a complex welding structure, and constructing a refined fatigue crack propagation calculation model;
(2) Determining input parameters of self-adaptive meshing, and performing self-adaptive meshing according to the geometric information of the fatigue crack propagation calculation model;
(3) After the initial grid division is completed, judging the internal and external attributes of grid nodes through a grid fast intersection module and an adjacent characteristic identification module and constructing a core 'step type' grid;
(4) Fitting external grid nodes of the calculation model to the boundary of the solid model by using a geometric feature approximation method and a near feature template method according to the fatigue crack propagation analysis calculation requirement;
(5) Optimizing the positions and topological relations of the grid nodes, and improving the quality of the final grid by a geometric position optimization and unit topology decomposition method and the like;
(6) And constructing a multi-core grid parallel generator, and realizing the automatic generation of the unstructured grid by adopting a region decomposition parallel algorithm and a distributed storage strategy.
Preferably, in the step (1), a CAD geometric model file of a complex welding structure is imported, geometric features of fatigue cracks are automatically identified and defined through a geometric data acquisition module, in order to guarantee robustness of a CAD/CAE core data module, the geometric file is analyzed by adopting an international universal standard, output in a B-Rep file form and used as input of a fatigue crack propagation analysis program, and refined modeling of a calculation model is realized based on a secondary development function of a CAD platform.
Preferably, step (2) comprises the sub-steps of:
(2.1) dispersing a calculation domain into an initial equal-size initial subdivision grid model according to the fatigue crack propagation calculation model of the complex welding structure, wherein the initial grid is used as a grid model to be encrypted in the subsequent grid division process;
(2.2) taking the geometric midpoint of the grid as a reference point in the initial subdivision grid model, calculating the curvature of the curved surface of the entity boundary, and carrying out self-adaptive grid encryption on the fatigue crack propagation calculation model according to the curvature criterion of the entity boundary;
(2.3) constructing a self-adaptive mesh subdivision model considering fine characteristics according to the geometric characteristics and the expansion path of the fatigue crack of the calculation model, and realizing accurate characterization and self-adaptive mesh encryption of fatigue crack expansion analysis;
(2.4) carrying out self-adaptive encryption on the grids of the calculation model according to the subdivision criterion, and judging whether the final grid encryption times reach the self-adaptive subdivision times or not; and if not, returning to execute the initial subdivision grid model construction and the subsequent steps until reaching the given self-adaptive subdivision times, and updating the grid to be used as the grid model to be processed.
Preferably, step (3) comprises the sub-steps of:
(3.1) constructing a grid generation rapid intersection module, determining the relative position relationship between grid nodes and the entity boundary of the complex welding structure, and identifying a 'step type' grid intersected with a geometric boundary as a core grid model to be fitted according to the relative position relationship;
and (3.2) establishing an automatic adjacent characteristic distinguishing module, automatically identifying a grid model intersected with a fatigue crack propagation path according to the geometric characteristics of the fatigue crack of the complex welding structure, and processing the grid model by adopting an adjacent characteristic template method during boundary fitting.
Preferably, step (4) comprises the sub-steps of:
(4.1) fitting external grid nodes of the calculation model to the boundary of the solid model of the complex welding structure by using a geometric feature approximation method and a proximity feature template method according to the fatigue crack propagation analysis calculation requirement;
(4.2) according to the geometrical characteristics of the fatigue cracks and the expansion paths, the surface appearance is complex, the curvature change is large, a multi-grid node fitting model is constructed for grids intersected with the fatigue crack expansion paths by adopting a proximity characteristic template method, and multi-angle high-quality solid model boundary fitting of a single grid node is realized;
and (4.3) for the non-adjacent characteristic geometric boundary of the complex welding structure, the surface curvature change of the solid model is relatively smooth, the grid nodes are fitted to the solid model boundary by adopting a multi-surface edge sharing principle, and the non-structural grid of the fatigue crack propagation calculation model of the complex welding structure is generated.
Preferably, step (5) comprises the sub-steps of:
(5.1) constructing a grid generation quality evaluation module, carrying out quality evaluation on the fitted grid by adopting the Jacobian ratio, the aspect ratio, the warping angle, the maximum and minimum angle and the like of the grid according to the grid quality requirement of the fatigue crack propagation analysis calculation model of the complex welding structure, and screening the grid with poor unit shape and the quality evaluation parameter which does not meet the calculation requirement;
and (5.2) establishing a grid generation quality optimization module, optimizing the grid node positions and the topological relation through a geometric position optimization and unit topology decomposition method and the like, and correcting the grid with low quality and unit quality which does not meet the calculation requirement, so that the quality evaluation parameters of the final grid are in a set reasonable range, and the final grid division quality is improved.
Preferably, step (6) comprises the sub-steps of:
(6.1) adopting a region decomposition parallel algorithm and a distributed storage strategy to realize the automatic generation of the unstructured grid;
(6.2) realizing the parallelism of the multi-core grid generator based on the improved GCA algorithm of the CPU/GPU parallelism;
and (6.3) realizing grid generation parallel computation based on a storage strategy combining distributed mode and shared mode.
Compared with the prior art, the embodiment of the invention provides a grid generation method, a device and equipment suitable for fatigue crack propagation analysis of a complex welding structure, and a series of grid division processes can realize automatic grid division of a geometric model containing fine features such as cracks and the like on one hand, so that a final non-structural grid can be well attached to a solid model boundary; on the other hand, the method can be automatically executed by parallel grid division electronic equipment without excessive manual intervention, can realize full-flow automatic grid division of a complex welding structure, reduces grid division difficulty, and improves grid generation efficiency.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flowchart of a grid generation method suitable for fatigue crack propagation analysis of a complex welded structure according to an embodiment of the present invention;
FIG. 2 is a complex welded structure model with fine features such as fatigue cracks provided by an embodiment of the invention;
FIG. 3 is a grid generating template suitable for fatigue crack characterization of a complex welded structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a mesh generation apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a grid generating electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Fig. 1 is a schematic flowchart of a grid generation method suitable for fatigue crack propagation analysis of a complex welded structure according to an embodiment of the present invention, including:
s101: acquiring a complex welding structure model including geometric information such as the position and the size of a fatigue crack;
s102: setting input parameters of self-adaptive non-structural grid division for a complex welding structure model;
s103: constructing a core 'step type' grid through a rapid intersection algorithm of the grid and the solid model boundary;
s104: fitting the grid nodes to the solid model boundary by using a geometric characteristic approximation method and a proximity characteristic template method;
s105: correcting the finally generated non-structural grid according to the grid quality requirement of fatigue crack propagation analysis;
s106: and constructing a multi-core grid parallel generator based on the CPU/GPU parallel strategy to realize the automatic division of the unstructured grid.
Illustratively, fig. 2 shows a complex welded structure model with fine features such as fatigue cracks provided by an embodiment of the invention. Wherein, fig. 2 (a) is an input high-strength steel welding structure model, which has fine characteristics such as fatigue cracks; FIG. 2 (b) is a schematic view of a weld structure at a certain position, including a nugget, a heat affected zone, a base material, etc.; FIG. 2 (c) is a schematic of a fatigue crack growth analysis of a welded structure. Based on the secondary development function of the CAD platform, the geometric characteristics of the fatigue cracks are automatically identified and defined, a CAD/CAE core data module is built in a B-Rep file form, and complete entity fine modeling of a complex welding structure model is achieved.
Illustratively, fig. 3 shows a grid generating template suitable for fatigue crack characteristics of a complex welding structure according to an embodiment of the present invention. Wherein, fig. 3 (a) is a calculation model of fatigue crack propagation analysis of a welded structure; FIG. 3 (b) is an initial meshing model; FIG. 3 (c) is a "multi-grid node" fitting template to achieve multi-angle high-quality solid model boundary fitting of a single grid node; FIG. 3 (d) is a grid intersecting fatigue cracks and propagation paths; FIG. 3 (e) is a schematic diagram of the processing of a grid near a fatigue crack by using a near feature template method, such as the edge of a grid node near a geometric vertexxA shaft,yA shaft,zThe axes respectively derive a plurality of projection grid nodes, and the projection grid nodes can be respectively fitted to the complex welding structure model boundary; FIG. 3 (f) is a computational grid for fatigue crack propagation analysis of the complex weld structure.
Corresponding to the foregoing method embodiment, an embodiment of the present invention further provides a parallel grid generating apparatus suitable for fatigue crack propagation analysis of a complex welded structure, as shown in fig. 4, including:
a geometric data acquisition module 401, configured to obtain a fatigue crack propagation model and geometric topology information of the complex welding structure;
a mesh parameter setting module 402 for setting mesh generation parameters for the fatigue crack propagation analysis model;
a mesh automatic division module 403, configured to generate an unstructured mesh of the fatigue crack propagation analysis computation model;
a grid fast intersection module 404, configured to determine a relative position relationship between a grid and a complex welding structure entity boundary;
a solid boundary processing module 405 for processing external mesh nodes intersecting a complex weld structure solid boundary;
a quality evaluation optimization module 406, configured to evaluate the quality of the finally generated mesh and optimize the low-quality mesh;
a data storage updating module 407, configured to store final mesh data for updating the computational model.
An embodiment of the present invention further provides a parallel grid generating electronic device, as shown in fig. 5, including a memory 501, a processor 502, and a visualization apparatus 503.
The memory 501 is used for storing a computer program for automatically dividing grids and grid generation data, realizing the automatic generation of non-structural grids based on distributed and shared storage strategies for the fatigue fracture analysis of large-scale complex welding structures, and realizing the readable storage of the computer program by adopting an RAM (random access memory), an NVM (non-volatile memory) and the like;
the processor 502 is configured to execute the computer program stored in the memory 501 to implement any one of the automatic mesh partitioning methods suitable for fatigue crack propagation analysis of a complex welding structure.
And the visualization device 503 is used for displaying the computational grid of the fatigue crack propagation analysis of the complex welding structure, converting grid data into a graph or an image for visualization display, and improving friendly human-computer interaction.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (8)
1. A grid generation method, a device and equipment suitable for fatigue crack propagation analysis of a complex welding structure are characterized by comprising the following steps:
(1) Introducing a geometric model of a complex welding structure, and constructing a refined fatigue crack propagation calculation model;
(2) Determining input parameters of self-adaptive meshing, and performing self-adaptive meshing according to the geometric information of the fatigue crack propagation calculation model;
(3) After the initial grid division is completed, judging the internal and external attributes of grid nodes through a grid fast intersection module and an adjacent characteristic identification module and constructing a core 'step type' grid;
(4) Fitting external grid nodes of the calculation model to the boundary of the solid model by using a geometric feature approximation method and a near feature template method according to the fatigue crack propagation analysis calculation requirement;
(5) Optimizing the positions and topological relations of the grid nodes, and improving the quality of the final grid by a geometric position optimization and unit topology decomposition method and the like;
(6) And constructing a multi-core grid parallel generator, and realizing the automatic generation of the non-structural grid by adopting a region decomposition parallel algorithm and a distributed storage strategy.
2. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to the claim 1 are characterized by comprising the following steps:
the geometric data acquisition module is used for the fatigue crack propagation model of the complex welding structure and geometric topological information;
the grid parameter setting module is used for setting grid generation parameters aiming at the fatigue crack propagation analysis model;
the automatic grid division module is used for generating an unstructured grid of the fatigue crack propagation analysis calculation model;
the grid rapid intersection module is used for determining the relative position relation between the grid and the entity boundary of the complex welding structure;
the entity boundary processing module is used for processing external grid nodes intersected with the entity boundary of the complex welding structure;
the quality evaluation optimization module is used for evaluating the quality of the finally generated grid and optimizing the low-quality grid;
and the data storage updating module is used for storing the grid data of the calculation model and updating the final calculation grid data.
3. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to the claim 1 are characterized in that an independently packaged geometric data acquisition module is constructed, the module is a CAD/CAE core data module, geometric information of a three-dimensional complex welding structure is used as input, the geometric information is output in a B-Rep file form and is used as input of a fatigue crack propagation analysis program, the secondary development function of a CAD platform is utilized to realize the fine modeling of a calculation model, the geometric characteristics of fatigue cracks are automatically identified and defined, the crack propagation path is automatically judged and the crack size is updated according to the local stress state of a mechanical structure, and the fatigue crack propagation process is really simulated.
4. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to claim 1 are characterized in that the grid parameter setting module and the automatic grid division module are used for setting the grid parameters, wherein the input parameters of the adaptive non-structural grid division comprise: calculating a model, the size of a grid to be generated, the curvature of an entity boundary, the self-adaptive subdivision times and the like, and generating a non-structural grid for the fatigue crack propagation of a complex welding structure according to the grid division parameters, wherein the method comprises the following substeps:
(2.1) dispersing a calculation domain into an initial equal-size initial subdivision grid model according to the fatigue crack propagation calculation model of the complex welding structure, wherein the initial grid is used as a grid model to be encrypted in the subsequent grid division process;
(2.2) taking the geometric midpoint of the grid as a reference point in the initial subdivision grid model, calculating the curvature of the curved surface of the entity boundary, and carrying out self-adaptive grid encryption on the fatigue crack propagation calculation model according to the curvature criterion of the entity boundary;
(2.3) constructing a self-adaptive mesh subdivision model considering fine characteristics according to the geometric characteristics and the expansion path of the fatigue crack of the calculation model, and realizing accurate characterization and self-adaptive mesh encryption of fatigue crack expansion analysis;
(2.4) carrying out self-adaptive encryption on the grids of the calculation model according to the subdivision criterion, and judging whether the final grid encryption times reach the self-adaptive subdivision times or not; if not, returning to execute the initial subdivision grid model construction and the subsequent steps until reaching the given self-adaptive subdivision times, and updating the grid to be used as the grid model to be processed.
5. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to claim 1 are characterized in that the grid fast intersection module comprises:
(3.1) constructing a grid generation rapid intersection module, determining the relative position relationship between grid nodes and the entity boundary of the complex welding structure, and identifying a 'step type' grid intersected with a geometric boundary as a core grid model to be fitted according to the relative position relationship;
and (3.2) establishing an automatic adjacent characteristic distinguishing module, automatically identifying a grid model intersected with a fatigue crack propagation path according to the geometric characteristics of the fatigue crack of the complex welding structure, and processing the grid model by adopting an adjacent characteristic template method during boundary fitting.
6. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to claim 1 are characterized in that the entity boundary processing module comprises:
(4.1) fitting external grid nodes of the calculation model to the boundary of the solid model of the complex welding structure by using a geometric feature approximation method and a proximity feature template method according to the fatigue crack propagation analysis calculation requirement;
(4.2) according to the geometrical characteristics of the fatigue cracks and the expansion paths, the surface appearance is complex, the curvature change is large, a multi-grid node fitting model is constructed for grids intersected with the fatigue crack expansion paths by adopting a proximity characteristic template method, and multi-angle high-quality solid model boundary fitting of a single grid node is realized;
and (4.3) for the non-adjacent characteristic geometric boundary of the complex welding structure, the surface curvature change of the solid model is relatively smooth, the grid nodes are fitted to the solid model boundary by adopting a multi-surface edge sharing principle, and the non-structural grid of the fatigue crack propagation calculation model of the complex welding structure is generated.
7. The method, the device and the equipment for generating the grid suitable for the fatigue crack propagation analysis of the complex welding structure according to the claim 1 are characterized in that the grid generation quality evaluation and optimization module comprises:
(5.1) constructing a grid generation quality evaluation module, carrying out quality evaluation on the fitted grid by adopting the Jacobian ratio, the aspect ratio, the warping angle, the maximum and minimum angle and the like of the grid according to the grid quality requirement of the fatigue crack propagation analysis calculation model of the complex welding structure, and screening the grid with poor unit shape and the quality evaluation parameter which does not meet the calculation requirement;
and (5.2) establishing a grid generation quality optimization module, optimizing the grid node positions and the topological relation through a geometric position optimization and unit topology decomposition method and the like, and correcting the grid with low quality and unit quality which does not meet the calculation requirement, so that the quality evaluation parameters of the final grid are in a set reasonable range, and the final grid division quality is improved.
8. The grid generation method, device and equipment suitable for the fatigue crack propagation analysis of the complex welding structure according to claim 1 are characterized in that the electronic equipment comprises a memory, a processor and a visualization device:
the storage is used for storing a computer program for automatically dividing grids and grid generation data, and for fatigue fracture analysis of a large-scale complex welding structure, the automatic generation of a non-structural grid is realized based on a storage strategy combining a distributed mode and a shared mode;
a processor for executing a computer program stored on a memory to perform the method steps of any of claims 1-6;
and the visualization device is used for displaying the calculation grid of the fatigue crack propagation analysis of the complex welding structure.
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Application publication date: 20230314 |