CN110096728A - A kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction - Google Patents
A kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction Download PDFInfo
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- CN110096728A CN110096728A CN201910182680.6A CN201910182680A CN110096728A CN 110096728 A CN110096728 A CN 110096728A CN 201910182680 A CN201910182680 A CN 201910182680A CN 110096728 A CN110096728 A CN 110096728A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 40
- 239000002184 metal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000005457 optimization Methods 0.000 claims abstract description 3
- 239000010949 copper Substances 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 9
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 8
- 240000002853 Nelumbo nucifera Species 0.000 description 8
- 230000005496 eutectics Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000005094 computer simulation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000009499 grossing Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000002591 computed tomography Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The present invention discloses a kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, is scanned with industry CT to lotus-root-shape porous metal, obtains multiple continuous micron order pictures and is successively numbered；Picture is imported into medical image software MIMICS 20.0 according to number from small to large, reconstructs the three-dimensional appearance model of alloy；Surface optimization processing is carried out to three-dimensional appearance model；CAD model is converted by processed threedimensional model；CAD model is repaired；Model after reparation is imported in Hypermesh, first divides triangular element, then tetrahedron element is generated by triangular element, and optimize tetrahedron element quality generated；Grid file is exported；Derived grid file is imported in ANSYS and carries out finite element analysis；Compared with conventional finite element analogy method, the present invention can preferably reflect object receiving force, the truth after being heated.
Description
Technical field
The present invention relates to reverse Engineering Technology fields, disclose a kind of lotus-root-shape porous metal finite element based on Reverse reconstruction
Analysis method.
Background technique
Lotus-root-shape porous metal material has directionality, not only has comprehensive performance more higher than original dense material (than strong
Degree and specific modulus are high), also there are some original unexistent excellent properties of dense material, such as: stress collection is medium and small, density is low, rigid
Spend big, large specific surface area, high heat conductance.Therefore, lotus-root-shape porous metal material such as medicine, aerospace, automobile, electronics,
The high-tech sectors such as building, nuclear industry have a wide range of applications.
A large amount of research has been done in computer simulation for lotus-root-shape porous metal performance both at home and abroad.But since lotus root shape is more
Structure is complicated for mesoporous metal (hole diameter change greatly, stomata is in irregular shape, stomata spacing change greatly, stomata is different in size, stomata
It is obvious to merge phenomenon) cause to construct CAD model difficulty with reverse Engineering Technology, grid division is difficult, or even cannot mark off conjunction
The triangular element of lattice, therefore there is presently no researchers to carry out finite element analysis to its performance with Reverse reconstruction technology.Currently,
Research both domestic and external is all based on Forward modeling (carrying out finite element modelling after the ideal model of building regular shape), can not
Reflect object receiving force, the truth after being heated.
Summary of the invention
The present invention provides a kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, passes through Reverse reconstruction skill
Art carries out finite element modelling to lotus-root-shape porous metal.
The present invention is realized by following steps:
(1) lotus-root-shape porous metal is scanned with industry CT, obtains multiple continuous micron order pictures and be successively numbered；
(2) picture that step (1) obtains is imported into medical image software MIMICS 20.0 according to picture number from small to large, weight
The three-dimensional appearance of structure alloy, and export " .stl " formatted file；
(3) " .stl " formatted file of step (2) is imported in Geomagic Wrap, is ordered with surface smoothing and grid doctor
It enables, improves the surface quality of model, export " .wrl " formatted file；
(4) " .wrl " formatted file of step (3) is imported in Geomagic Design X, first divides field, then for difference
Field construct corresponding nurbs surface, setting-out curved surface, surface of revolution finally generates CAD model, output using Boolean calculation
" .X_T " formatted file；
(5) will step (4) " .X_T " formatted file import SpaceClaim in, repair additional side, small-sized curve, low profile,
The defects of non-precision side；
(6) model after the reparation of step (5) is imported in Hypermesh, first divides triangle with " QI optimize " tool
Unit, then tetrahedron element is generated by triangular element, then pass through main menu " mesh-check-elements-tetra
Mesh optimizaiton " tool optimizes tetrahedron element quality generated；Grid is exported as into " .cbd " file；
(7) " .cbd " file of step (6) is imported into ANSYS, carries out mechanical analysis.
Lotus-root-shape porous metal in step (1) is prepared with the method for gas-metal eutectic directional solidification, specific steps
It is as follows: load weighted metal being put into melting kettle first, metal molten is slowly heated to after being evacuated to 1Pa, is filled with height
Pure hydrogen keeps the temperature 5~15min, opens lower pull system, molten metal is flowed out and solidified in mold, in hauling speed to 0.6MPa
Lotus-root-shape porous metal is gradually drawn out under drive for the draw bar of 20~30mm/min.
The metal is the mixing of one or more of copper, chromium, iron arbitrary proportion.
Present invention technical advantage outstanding and distinguishing feature mainly have:
(1) present invention can preferably reflect object receiving force, the truth after being heated.
(2) present invention can be to shape irregular, and the model that conventional method can not divide carries out grid dividing；It is divided
Tetrahedron element quality it is high.
Detailed description of the invention
Fig. 1 is the flow chart of the embodiment of the present invention 1；
Fig. 2 is the Geomagic Wrap tri patch figure of the embodiment of the present invention 1；
Fig. 3 is the Geomagic Design X geometry CAD model figure generated of the embodiment of the present invention 1；
The tetrahedron element figure that Fig. 4 is divided by the Hypermesh of the embodiment of the present invention 1；
Fig. 5 is the ANSYS Workbench simulated strain figure of the embodiment of the present invention 1；
Fig. 6 is that the ANSYS Workbench of the embodiment of the present invention 1 simulates the resulting and resulting lotus root shape Porous Cu stress-of experiment
Strain curve compares figure.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
Embodiment 1
A kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, the compression performance simulation of lotus root shape Porous Cu, tool
Body includes the following steps:
(1) prepare lotus-root-shape porous metal with the method for gas-metal eutectic directional solidification: the present embodiment uses high purity copper
Load weighted copper, is put into melting kettle by (99.99%, mass fraction) first, is slowly heated to metal after being evacuated to 1Pa
Fusing is filled with high-purity hydrogen to 0.6MPa, after keeping the temperature 10min at 1573K, opens lower pull system, copper liquid flows out and in mould
Solidification in tool gradually draws out lotus root shape Porous Cu under the drive for the draw bar that hauling speed is 30mm/min；
(2) with industrial CT scan sample, at interval of 10 microns of scanning pictures, continuously multiple micron order pictures and successively are obtained
It is numbered；
(3) picture that step (2) obtain is imported into medical image software MIMICS 20.0 according to picture number from small to large, weight
The three-dimensional appearance of structure alloy, and export " .stl " formatted file；
(4) " .stl " formatted file of step (3) is imported in Geomagic Wrap, is ordered with surface smoothing and grid doctor
It enables, improves the surface quality of model, obtain final optimization pass model as shown in Fig. 2, output " .wrl " formatted file；
(5) step (4) " .wrl " formatted file is imported in Geomagic Design X, field is first divided after importing, then be directed to
Different fields constructs corresponding nurbs surface, setting-out curved surface, and surface of revolution finally generates CAD model such as using Boolean calculation
Shown in Fig. 3, " .X_T " formatted file is exported；
(6) step (5) " .X_T " formatted file is imported in SpaceClaim, repairs additional side, small-sized curve, low profile, non-
The defects of accurate side；
(7) model after repairing step (6) imports in Hypermesh, first divides triangle list with " QI optimize " tool
Member, then tetrahedron element is generated by triangular element, then pass through main menu " mesh-check-elements-tetra
Mesh optimizaiton " tool optimizes tetrahedron element quality generated, and the grid divided is as shown in Figure 4；By net
Lattice export as " .cbd " file；
(8) step (7) " .cbd " file is imported into ANSYS APDL, and rewrites this document using the export function of document model,
Make it to be identified by ANSYS Workbench；
(9) " .cbd " file after rewriteeing step (8) imports ANSYS Workbench, using Statics of Structures module to mould
Type carries out compression sunykatuib analysis, and material model is set as polyteny etc. to reinforcing (MISO) model, is oriented using metal-gas eutectic
The physical parameter of the fine and close fine copper of freezing method preparation is all constrained as analog parameter, by the displacement of model lower end surface, for upper
End face, the displacement for constraining X axis and Y-axis is 0, applies displacement load in the Z-axis direction, opens large deformation and is arranged appropriate
Sub-step number comes so that problem calculates convergence in solution procedure.
Strain cloud atlas obtained is as shown in Figure 5；Computer simulation load-deformation curve and empirical curve as shown in fig. 6,
The two is roughly the same.
Embodiment 2
A kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, the tensile property mould of lotus root shape porous C u-0.3Cr
It is quasi-, specifically comprise the following steps:
(1) prepare lotus-root-shape porous metal with the method for gas-metal eutectic directional solidification: the present embodiment uses high purity copper
(99.99%, mass fraction) and Cu-10%Cr(mass fraction) alloy will weigh according to the stoichiometric ratio of Cu-0.3Cr alloy
Good metal is put into melting kettle, is slowly heated to metal molten after being evacuated to 1Pa, is filled with high-purity hydrogen to 0.6MPa,
After keeping the temperature 15min at 1573K, lower pull system is opened, aluminium alloy is flowed out and solidified in mold, is 20mm/ in hauling speed
Lotus root shape Porous Cu Cu-0.3Cr is gradually drawn out under the drive of the draw bar of min；
(2) with industrial CT scan sample, at interval of 10 microns of scanning pictures, continuously multiple micron order pictures and successively are obtained
It is numbered；
(3) picture that step (2) obtain is imported into medical image software MIMICS 20.0 according to picture number from small to large, weight
The three-dimensional appearance of structure alloy, and export " .stl " formatted file；
(4) " .stl " formatted file of step (3) is imported in Geomagic Wrap, is ordered with surface smoothing and grid doctor
It enables, improves the surface quality of model, export " .wrl " formatted file；
(5) step (4) " .wrl " formatted file is imported in Geomagic Design X, field is first divided after importing, then be directed to
Different fields constructs corresponding nurbs surface, setting-out curved surface, and surface of revolution finally generates CAD model using Boolean calculation,
Export " .X_T " formatted file；
(6) step (5) " .X_T " formatted file is imported in SpaceClaim, repairs additional side, small-sized curve, low profile, non-
The defects of accurate side；
(7) model after repairing step (6) imports in Hypermesh, first divides triangle list with " QI optimize " tool
Member, then tetrahedron element is generated by triangular element, then pass through main menu " mesh-check-elements-tetra
Mesh optimizaiton " tool optimizes tetrahedron element quality generated, and grid exported as " .cbd " file；
(8) step (7) " .cbd " file is imported into ANSYS APDL, and rewrites this document using the export function of document model,
Make it to be identified by Workbench；
(9) " .cbd " file after rewriteeing step (8) imports ANSYS Workbench, using Statics of Structures module to mould
Type carries out stretching sunykatuib analysis, and material model is set as polyteny etc. to reinforcing (MISO) model, is oriented using metal-gas eutectic
The physical parameter of the fine and close Cu-0.3Cr of freezing method preparation is all constrained as analog parameter, by the displacement of model lower end surface, right
In upper surface, the displacement for constraining X axis and Y-axis is 0, applies displacement load in the Z-axis direction, opens large deformation and is arranged suitable
When sub-step number come so that problem calculates convergence in solution procedure.
Both computer simulation load-deformation curve and empirical curve are roughly the same.
Embodiment 3
A kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, the tensile property mould of lotus root shape porous C u-0.8Cr
It is quasi-, specifically comprise the following steps:
(1) prepare lotus-root-shape porous metal with the method for gas-metal eutectic directional solidification: the present embodiment uses high purity copper
(99.99%, mass fraction) and Cu-10%Cr(mass fraction) alloy will weigh according to the stoichiometric ratio of Cu-0.8Cr alloy
Good metal is put into melting kettle, is slowly heated to metal molten after being evacuated to 1Pa, is filled with high-purity hydrogen to 0.6MPa,
After keeping the temperature 5min at 1573K, lower pull system is opened, aluminium alloy is flowed out and solidified in mold, is 25mm/ in hauling speed
Lotus root shape porous C u-0.8Cr is gradually drawn out under the drive of the draw bar of min；
(2) with industrial CT scan sample, at interval of 10 microns of scanning pictures, continuously multiple micron order pictures and successively are obtained
It is numbered；
(3) picture that step (2) obtain is imported into medical image software MIMICS 20.0 according to picture number from small to large, weight
The three-dimensional appearance of structure alloy, and export " .stl " formatted file；
(4) " .stl " formatted file of step (3) is imported in Geomagic Wrap, is ordered with surface smoothing and grid doctor
It enables, improves the surface quality of model, export " .wrl " formatted file；
(5) step (4) " .wrl " formatted file is imported in Geomagic Design X, field is first divided after importing, then be directed to
Different fields constructs corresponding nurbs surface, setting-out curved surface, and surface of revolution finally generates CAD model using Boolean calculation,
Export " .X_T " formatted file；
(6) step (5) " .X_T " formatted file is imported in SpaceClaim, repairs additional side, small-sized curve, low profile, non-
The defects of accurate side；
(7) model after repairing step (6) imports in Hypermesh, first divides triangle list with " QI optimize " tool
Member, then tetrahedron element is generated by triangular element, then pass through main menu " mesh-check-elements-tetra
Mesh optimizaiton " tool optimizes tetrahedron element quality generated, and grid exported as " .cbd " file；
(8) step (7) " .cbd " file is imported into ANSYS APDL, and rewrites this document using the export function of document model,
Make it to be identified by Workbench；
(9) " .cbd " file after rewriteeing step (8) imports ANSYS Workbench, with Statics of Structures module to model
Stretching sunykatuib analysis is carried out, material model is set as polyteny etc. to reinforcing (MISO) model, is oriented using metal-gas eutectic solidifying
Gu the physical parameter of the fine and close Cu-0.8Cr of method preparation is all constrained as analog parameter, by the displacement of model lower end surface, for
Upper surface, constraining the displacement of X axis and Y-axis is 0, applies displacement load in the Z-axis direction, opens large deformation and is arranged suitably
Sub-step number come so that problem calculates convergence in solution procedure.
Both computer simulation load-deformation curve and empirical curve are roughly the same.
Claims (3)
1. a kind of lotus-root-shape porous metal finite element method based on Reverse reconstruction, which is characterized in that by following steps come
It realizes:
(1) lotus-root-shape porous metal is scanned with industry CT, obtains multiple continuous micron order pictures and be successively numbered；
(2) picture for obtaining step (1) imports MIMICS 20.0 according to number from small to large, reconstructs the three-dimensional appearance of alloy
Model；
(3) surface optimization processing is carried out with three-dimensional appearance model of the Geomagic Wrap to step (2)；
(4) CAD model is converted by step (3) processed threedimensional model with Geomagic Design X；
(5) it is repaired with CAD model of the SpaceClaim to step (4)；
(6) model after repairing step (5) imports in Hypermesh, first divides triangular element, then given birth to by triangular element
At tetrahedron element, and optimize tetrahedron element quality generated；
(7) finite element analysis is carried out using tetrahedron element of the ANSYS to step (6).
2. the lotus-root-shape porous metal finite element method based on Reverse reconstruction according to claim 1, which is characterized in that step
Suddenly specific preparation process is as follows for the lotus-root-shape porous metal in (1): metal being put into melting kettle first, is evacuated to 1Pa
After be heated to metal molten, be filled with hydrogen to 0.6MPa, keep the temperature 5~15min, open lower pull system, molten metal is flowed out and is solidified,
Lotus-root-shape porous metal is gradually drawn out under the drive for the draw bar that hauling speed is 20~30mm/min.
3. the lotus-root-shape porous metal finite element method based on Reverse reconstruction according to claim 2, which is characterized in that gold
Belong to is that one or more of copper, chromium, iron arbitrary proportion mix.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992380A (en) * | 2019-12-10 | 2020-04-10 | 昆明理工大学 | Method for extracting internal pores of lotus-shaped porous metal and measuring geometric parameters |
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