CN109885909B - Local heat treatment reinforcement modeling and grid division method for ultra-large pressure vessel - Google Patents
Local heat treatment reinforcement modeling and grid division method for ultra-large pressure vessel Download PDFInfo
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Abstract
The invention discloses a local heat treatment reinforcement modeling and grid division method for an ultra-large pressure vessel, which comprises the following steps: analyzing the simulated object, and establishing a three-dimensional entity model by utilizing three-dimensional modeling software, wherein the three-dimensional entity model mainly comprises two parts, one Part is an actual model, the other Part is a partial weld enlarged model, and the other Part is a partial weld enlarged model; part-A and Part-B are exported in the.x_t file format, respectively, and Part-A and Part-B are imported into the same model of ABAQUS; drawing a layout of the rib plates in a sketch module, and establishing a rib plate stretching Part-C; copying Part-A in a Part module and deleting the insertion tube by adopting a method of deleting the surface to obtain Part-A-1; selecting a proper position segmentation for the important research area, and the like. The invention provides a reinforcement scheme modeling and grid division method considering local heat treatment in a welding process through a finite element method, and has important significance on the structural integrity of the oversized container.
Description
Technical Field
The invention belongs to the technical field of welding numerical simulation, and particularly relates to a local heat treatment reinforcement modeling and grid division method for an ultra-large pressure vessel.
Background
The pressure vessel is core equipment of the process industry, is widely applied to the fields of nuclear power, petrochemical industry, aerospace, medical production and the like, and continuously develops to high temperature, high pressure, super wall thickness and large scale. The pressure vessel with oversized and large wall thickness inevitably generates residual stress in the welding manufacturing process, and post-welding heat treatment is needed for eliminating the residual stress, so that the post-welding heat treatment can effectively reduce the residual stress of the welding of the joint, and has important significance for ensuring the safe operation of the pressure vessel. The whole heat treatment cannot be performed because the whole apparatus is too large. The use of localized post-weld heat treatment is a relatively viable solution, ASME B & PV specifications, volume iii, nuclear facility component construction rules NE, require that an endless belt be heated around the entire circumference of the container when the container is subjected to localized post-weld heat treatment. However, for a cylinder of an oversized diameter, the electrical power required to heat an annular band around the circumference of the cylinder is excessive, making implementation more difficult.
Disclosure of Invention
Based on the technical problems, the invention provides a local heat treatment reinforcement modeling and grid division method for an oversized pressure container, and the method provides a reinforcement scheme considering local heat treatment in a welding process through a finite element method, so that the method has great significance on the structural integrity of the oversized pressure container.
The technical scheme adopted by the invention is as follows:
a local heat treatment reinforcement modeling and grid division method for an ultra-large pressure vessel comprises the following steps:
step 1: analyzing the simulated object, and establishing a three-dimensional entity model by utilizing three-dimensional modeling software, wherein the three-dimensional entity model mainly comprises two parts, one Part is an actual model, the other Part is a partial weld enlarged model, and the other Part is a partial weld enlarged model; part-A and Part-B are exported in the.x_t file format, respectively, and Part-A and Part-B are imported into the same model of ABAQUS;
step 2: drawing a layout of the rib plates in a sketch module, and establishing a rib plate stretching Part-C;
step 3: copying Part-A in a Part module and deleting the insertion tube by adopting a method of deleting the surface to obtain Part-A-1; performing Boolean operation in an assembly module, cutting Part-C by using Part-A-1 to obtain notched array rib plate Part-C-1, and deleting redundant parts;
step 4: copying two Part-B in a Part module, and respectively creating Part-B-1 and Part-B-2 by adopting a method of deleting a plane;
step 5, adding Part-B-1 into the assembly module, translating the array rib plate Part-C-1 towards the direction of the axis of the cylinder by a small distance, performing Boolean operation, and cutting the Part-C-1 by using the Part-B-1 to obtain a new array rib plate Part-C-2;
step 6: re-adding Part-B-1 in the assembly module, combining Part-B-1 and Part-C-2, and selecting and maintaining geometric intersection boundaries to obtain Part-D;
step 7: establishing a shell unit Part-E, and cutting Part-D by using the Part-E in an assembly module to obtain Part-F; in the component module, cutting each rib plate according to the height requirement of the rib plate, and deleting redundant blocks on two sides and the upper part of the rib plate by adopting a surface deleting method;
step 8: adding Part-B-2 into the assembly module, merging Part-F and Part-B-2, and selecting and deleting geometric intersection boundaries to obtain Part-G to complete modeling work;
step 9: dividing the whole model into areas for key research, establishing a stretching shell unit Part, wherein the section shape of the shell unit is consistent with the shape of a heating belt, performing Boolean operation on an assembly module, and cutting out a heating belt area;
step 10: proper position segmentation is selected for the key research area, so that the effect that the weld joint section is seen through the hiding and displaying functions can be achieved, and adverse effects on subsequent grid drawing can be avoided;
step 11: only displaying the entity capable of seeing the weld interface, and selecting a splitting surface: connecting the weld toes at two sides of the weld joint respectively by using the shortest path between the two points, and selecting split geometric elements: dividing a welding line and a base material by using N-edge fragments, wherein the welding line comprises part of the base material, and the later description adopts the gold, at the moment, the gold is divided into at least two sections, and two side surfaces of a rib plate are used for cutting a cylinder body connected with the rib plate; the step is completed to cut the model, namely the color of the model is yellow or green, and brown cannot appear;
step 12: selecting a proper position of one section of the gold, and selecting a splitting surface: sketch drawing is carried out on the well section, and the actual Weld bead morphology is actually drawn and referenced;
step 13: determining the whole seeds according to the model size and the Weld seam size, only displaying the gold of the step 12 to perform local grid seed arrangement, and setting local grid seeds on blocks except for the area for important research, wherein the grid is sparse, so that the calculation precision can be met;
step 14: the grid is a hexahedral grid, the Weld joint and the entities adjacent to the Weld joint are set as sweep grids, the grid is drawn according to the clockwise or anticlockwise sequence from the entity of the Weld joint provided with the local seeds, the failure of grid division can check whether the sweep direction is correct, the local grid division is carried out according to the sequence of spreading from the Weld joint to the periphery, and the principle of drawing the Weld joint is also followed;
step 15: according to the principle and the method, the division of the whole model grid is completed; and checking the grid quality, and if the grid quality is not wrong and the warning value is less than 10%, the drawn grid is qualified.
Preferably, in step 2: the length of the rib plate is longer than the required length.
Preferably, in step 4: deleting the insertion tube when the Part-B-1 is created; only the insertion tube is reserved when Part-B-2 is created.
Preferably, in step 5: the translation distance is 0.01mm.
Preferably, in step 7: the shell units Part-E are used for further obtaining the rib plates with required lengths.
Preferably, in step 14, the order of drawing the grids is: firstly, drawing welding lines and areas adjacent to the welding lines in sequence from inside to outside; and then dividing other areas, and finally dividing the grid of the suggested rib plate.
The beneficial technical effects of the invention are as follows:
the modeling function of the finite element software adopted by the invention is weaker than that of three-dimensional modeling software Solidworks, pro/E, 3DS Max and the like, but the modeling of a complex model can be easily completed by combining the characteristics and advantages of the two with modeling.
The modeling method of the three-dimensional modeling software matched with the finite element software is strong in grid processing of the complex model, can easily realize simulation of multi-layer multi-pass welding, and particularly has an application range of welding simulation for a pressure container with a complete structure of a large-scale welding joint.
The present invention provides a reinforcement scheme by means of finite elements that takes into account the localized heat treatment of the welding process, and is of great importance for the structural integrity of such oversized containers.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a model diagram Part-A and Part-A-1 of example 1 according to an embodiment of the present invention;
FIG. 2 is a model diagram Part-B, part-B-1 and Part-B-2 of an embodiment example 1 according to the present invention.
FIG. 3 is a diagram of a model cut according to example 1 of the present invention;
FIG. 4 is a detailed grid diagram of example 1 in accordance with an embodiment of the present invention;
FIG. 5 is a diagram of a model cut according to example 2 of the present invention;
fig. 6 is a specific grid diagram of embodiment example 2 according to the present invention.
Detailed Description
The invention provides a local heat treatment reinforcement modeling and grid division method for an ultra-large pressure vessel, which comprises the following concrete implementation steps:
step 1: and analyzing the simulation object, and establishing a three-dimensional entity model by using three-dimensional modeling software Solidworks and the like, wherein the three-dimensional model mainly comprises two models, one of which is an actual model and is named as Part-A. The other is a partial weld magnification model, named Part-B. Part-A and Part-B are exported in the.x_t file format, respectively, and Part-A and Part-B are imported into the same model of ABAQUS.
Step 2: and drawing a layout of the rib plates in the sketch module, wherein the length of the rib plates is as long as possible than the required length, so that high-quality grids can be drawn conveniently. And (5) establishing a rib plate stretching Part-C.
Step 3: and copying the Part-A in the component module and deleting the insertion tube by adopting a surface deleting method to obtain the Part-A-1. And (3) carrying out Boolean operation in the assembly module, cutting Part-C by using Part-A-1 to obtain a notched array rib plate Part-C-1, and deleting redundant parts.
Step 4: two Part-B's are duplicated in the component module, and Part-B-1 (delete insert tube) and Part-B-2 (only insert tube is reserved) are created by deleting the face. The purpose is to prevent the subsequent mould building process from cutting the rib plate, generating redundant lines and affecting the grid quality.
Step 5: and adding Part-B-1 into the assembly module, translating the array rib plate Part-C-1 towards the direction of the axis of the cylinder by a small distance (for example, 0.01 mm), performing Boolean operation, and cutting the Part-C-1 by using the Part-B-1 to obtain a new array rib plate Part-C-2.
Step 6: and re-adding Part-B-1 in the assembly module, combining the Part-B-1 and the Part-C-2, and selecting and maintaining geometric intersection boundaries to obtain Part-D. If the combination is unsuccessful, the translation distance of the step 5 is properly adjusted according to the actual situation, and the final purpose of the translation is to combine the Part-B-1 and the Part-C-2 to obtain the Part-D.
Step 7: the shell element Part-E is built up for the purpose of further obtaining the web of the desired length. Part-D was cut with Part-E in the assembly module to yield Part-F. In the component module, each rib plate is diced according to the height requirement of the rib plate, and redundant blocks on the two sides and the upper part of the rib plate are deleted by adopting a surface deleting method.
Step 8: and adding Part-B-2 into the assembly module, merging Part-F and Part-B-2, and selecting and deleting geometric intersection boundaries to obtain Part-G to complete modeling work.
Step 9: the whole model is partitioned to cut out areas for important research, so that surrounding parts are not cut when the important research area is diced, and grids with higher quality can be drawn. And (3) establishing a stretching shell unit Part, wherein the cross section shape of the shell unit is consistent with the shape of the heating belt, and carrying out Boolean operation on the assembly module to cut out a heating belt area.
Step 10: the proper position 'cutting one knife' is selected for the key research area, namely the cutting is performed, so that the effect that the welding seam section is seen through the hiding and displaying functions can be achieved, and the subsequent grid drawing cannot be adversely affected.
Step 11: only displaying the entity capable of seeing the weld interface, and selecting a splitting surface: connecting the weld toes at two sides of the weld joint respectively by using the shortest path between the two points, and selecting split geometric elements: the Weld (including part of the base material, and the following description will use the gold) and the base material are separated by using N-edge slicing, and the gold is at least divided into two sections, and it is recommended that the gold is not cut into too many sections, and in principle, the fewer the more preferable. The two side surfaces of the rib plate are used for cutting the cylinder body connected with the rib plate, so that welding seams are not needed to be cut as far as possible. If staged heating is to be performed, the weld may be cut. This step completes the dicing of the model, i.e. the color of the model is yellow or green, and no brown color can appear.
Step 12: selecting a proper position of one section of the gold, and selecting a splitting surface: sketch drawing is carried out on the well section, and the actual Weld bead morphology is drawn.
Step 13: the whole seeds are determined according to the model size and the weld seam size, and are as small as possible in principle, so that the dense grid of the parts for key research is ensured, and the calculation accuracy is improved. Only the gold of step 12 is shown for the local grid seed placement. The local grid seeds are also arranged on the blocks except the areas for important research, the grids are sparse, and the calculation precision can be met.
Step 14: the grid is a hexahedral grid. The Weld joint and the entities adjacent to the Weld joint are set as sweep grids, grids are drawn according to the clockwise or anticlockwise sequence from the entity provided with the local seeds, whether the sweep direction is correct can be checked by grid division failure, the local grid division is carried out according to the sequence of spreading from the Weld joint to the periphery, and the principle of drawing the Weld joint is also followed. The sequence of drawing the grid is as follows: firstly, drawing welding lines and areas adjacent to the welding lines in sequence from inside to outside; and then dividing other areas, and finally dividing the grid of the suggested rib plate. The key research area has dense integral seeds and dense grids, and the local seed grids are arranged at the periphery of the key research area, so that a natural transition area exists.
Step 15: according to the principle and the method, the division of the whole model grid is completed. And checking the grid quality, and if the grid quality is not wrong and the warning value is less than 10%, the drawn grid is qualified.
The invention will be further described with reference to specific examples of application.
Example 1
Referring to FIGS. 1-4, the ultra-large pressure vessel cylinder has a thickness of 50mm, a diameter of 40m, an insert plate thickness of 120mm, a height of about 6m, and a width of about 4m. The rib plates are 1000mm in length, 40mm in thickness, 300mm in height and 800mm in interval. FIG. 1 shows that Part-A imported into finite element software is subjected to Part-A-1 by deleting an insert tube through a face deleting method. FIG. 2 shows that Part-B imported into finite element software, part-B-1 (deleting the insert tube) and Part-B-2 (only the insert tube is reserved) are obtained by deleting the insert tube by a delete plane method. FIG. 3 is a plot of the area of focus and transition region of the entire model, with 1-focus (large circle), 2-transition (middle portion of two circles). Fig. 4 is a final trellis diagram obtained by the present invention, with a total of 370,90 nodes and 327,521 cells. According to the method, rib plate modeling perpendicular to the tangential direction of the welding line can be realized, the grid quality is improved on the premise of reducing the grid number, and the calculation efficiency is improved.
Example 2
Referring to FIGS. 5-6, the ultra-large pressure vessel cylinder has a thickness of 50mm, a diameter of 40m, an insert plate thickness of 120mm, and a diameter of about 4.2m. The rib plates are 1000mm in length, 40mm in thickness, 300mm in height and 800mm in interval. FIG. 5 is a plot of the area of focus and transition region of the entire model, with 1-focus (large circle), 2-transition (middle portion of two circles). Fig. 6 is a final trellis diagram obtained by the present invention, with a total of 410,189 nodes and 367,344 cells. According to the method, rib plate modeling perpendicular to the tangential direction of the welding line can be realized, the grid quality is improved on the premise of reducing the grid number, and the calculation efficiency is improved.
Claims (4)
1. A local heat treatment reinforcement modeling and grid division method for an ultra-large pressure vessel is characterized by comprising the following steps:
step 1: analyzing the simulated object, and establishing a three-dimensional solid model by utilizing three-dimensional modeling software, wherein the three-dimensional solid model comprises two parts, one Part is an actual model, the other Part is a partial weld enlarged model, and the other Part is a partial weld enlarged model; part-A and Part-B are exported in the.x_t file format, respectively, and Part-A and Part-B are imported into the same model of ABAQUS;
step 2: drawing a layout of the rib plates in a sketch module, and establishing a rib plate stretching Part-C;
step 3: copying Part-A in a component module and deleting an insertion tube by adopting a method of deleting a surface to obtain Part-A-1; performing Boolean operation in an assembly module, cutting Part-C by using Part-A-1 to obtain notched array rib plate Part-C-1, and deleting redundant parts;
step 4: copying two Part-B in a Part module, and respectively creating Part-B-1 and Part-B-2 by adopting a method of deleting a plane;
step 5, adding Part-B-1 into the assembly module, translating the array rib plate Part-C-1 towards the direction of the axis of the cylinder by a distance of 0.01mm, performing Boolean operation, and cutting the Part-C-1 by using the Part-B-1 to obtain a new array rib plate Part-C-2;
step 6: re-adding Part-B-1 in the assembly module, combining Part-B-1 and Part-C-2, and selecting and maintaining geometric intersection boundaries to obtain Part-D;
step 7: establishing a shell unit Part-E, and cutting Part-D by using the Part-E in an assembly module to obtain Part-F; in the component module, cutting each rib plate according to the height requirement of the rib plate, and deleting redundant blocks on two sides and the upper part of the rib plate by adopting a surface deleting method;
step 8: adding Part-B-2 into the assembly module, merging Part-F and Part-B-2, and selecting and deleting geometric intersection boundaries to obtain Part-G to complete modeling work;
step 9: dividing the whole model into areas for research, establishing a stretching shell unit Part, wherein the cross section shape of the shell unit is consistent with the shape of a heating belt, performing Boolean operation in an assembly module, and cutting out the heating belt area;
step 10: the research area can be seen through the hiding and displaying functions, and the positions of the drawing grids are not affected to be divided;
step 11: only displaying the entity capable of seeing the weld interface, and selecting a splitting surface: connecting the weld toes at two sides of the weld joint respectively by using the shortest path between the two points, and selecting split geometric elements: dividing a welding line and a base material by using N-edge fragments, wherein the welding line comprises part of the base material, and the later description adopts the gold, at the moment, the gold is divided into at least two sections, and two side surfaces of a rib plate are used for cutting a cylinder body connected with the rib plate; the step is completed to cut the model, the color of the model is yellow or green, and brown cannot appear;
step 12: selecting one section of the gold, and selecting a splitting surface: sketching the section of the gold, and drawing the shape of an actual welding bead;
step 13: determining the whole seeds according to the model size and the Weld seam size, only displaying the gold of the step 12 to perform local grid seed arrangement, and setting local grid seeds except for the blocks of the research area, wherein the grid is sparse, so that the calculation precision can be met;
step 14: the grids are hexahedral grids, the grids are drawn according to the clockwise or anticlockwise sequence from the entity of the Weld provided with the local grid seeds, the failure of grid division can check whether the sweeping direction is correct, the local grid division is carried out according to the sequence of spreading from the welding seam to the periphery, and the principle of drawing the welding seam is also followed;
step 15: according to the principle and the method of the steps 1-14, dividing the whole model grid; and checking the grid quality, and if the grid quality is not wrong and the warning value is less than 10%, the drawn grid is qualified.
2. The method for modeling and meshing a local heat treatment for a very large pressure vessel according to claim 1, wherein in step 2: the length of the rib plate is longer than the required length.
3. The method for modeling and meshing a localized heat treatment of a very large pressure vessel according to claim 1, wherein in step 4: deleting the insertion tube when the Part-B-1 is created; only the insertion tube is reserved when Part-B-2 is created.
4. The method for modeling and meshing a localized heat treatment of a very large pressure vessel according to claim 1, wherein in step 7: the shell units Part-E are used for further obtaining the rib plates with required lengths.
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| CN101976291A (en) * | 2010-11-02 | 2011-02-16 | 甘肃蓝科石化高新装备股份有限公司 | Manufacturing method of heat exchanger plate |
| CN103886163A (en) * | 2014-04-14 | 2014-06-25 | 湘潭大学 | Meshing method of finite element model of turbine blade thermal barrier coating |
| CN105095582A (en) * | 2015-07-23 | 2015-11-25 | 常州大学 | Ultra-large type still kettle design method based on multi-software joint simulation |
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