Lotus root-shaped porous metal finite element analysis method based on reverse reconstruction

A lotus-shaped porous, analysis method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as complex structure, different length of pores, irregular shape of pores, etc., and achieve high-quality results

Inactive Publication Date: 2019-08-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex structure of the lotus-shaped porous metal (large changes in pore diameter, irregular pore shape, large change in pore spacing, different pore lengths, and obvious pore merger), it is difficult to construct a CAD model with reverse engineering technology, and it is difficult to divide the grid. Qualified triangular elements cannot be divided, so no researchers have used reverse reconstruction technology to perform finite element analysis on its performance
At present, the research at home and abroad is all based on forward modeling (the finite element simulation is performed after constructing an ideal model with regular shape), which cannot reflect the real situation of the object after being subjected to force and heat.

Method used

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  • Lotus root-shaped porous metal finite element analysis method based on reverse reconstruction
  • Lotus root-shaped porous metal finite element analysis method based on reverse reconstruction
  • Lotus root-shaped porous metal finite element analysis method based on reverse reconstruction

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A finite element analysis method for lotus-shaped porous metal based on inverse reconstruction, the compression performance simulation of lotus-shaped porous copper, specifically includes the following steps:

[0027] (1) Preparation of lotus root-shaped porous metal by directional solidification of gas-metal eutectic: In this example, high-purity copper (99.99%, mass fraction) is used. First, the weighed copper is put into a melting crucible, and vacuumized to After 1Pa, heat slowly until the metal melts, fill it with high-purity hydrogen to 0.6MPa, and keep it at 1573K for 10 minutes, then turn on the pull-down system, and the copper liquid will flow out and solidify in the mold, driven by the pull rod with a pulling speed of 30mm / min Gradually pull out the lotus-shaped porous copper;

[0028] (2) Use industrial CT to scan the sample, scan a picture at an interval of 10 microns, obtain multiple consecutive micron-level pictures and number them sequentially;

[0029] ...

Embodiment 2

[0038] A finite element analysis method for lotus-shaped porous metals based on inverse reconstruction, the tensile performance simulation of lotus-shaped porous Cu-0.3Cr, specifically includes the following steps:

[0039] (1) Preparation of lotus-shaped porous metal by directional solidification of gas-metal eutectic: In this example, high-purity copper (99.99%, mass fraction) and Cu-10%Cr (mass fraction) alloy are used, according to Cu-0.3Cr For the stoichiometric ratio of the alloy, put the weighed metal into the melting crucible, evacuate to 1Pa, then slowly heat until the metal melts, fill in high-purity hydrogen to 0.6MPa, and keep it at 1573K for 15 minutes, then turn on the pull-down system, the alloy The liquid flows out and solidifies in the mold, and the lotus-shaped porous copper Cu-0.3Cr is gradually drawn under the drive of the draw bar with a pulling speed of 20mm / min;

[0040] (2) Use industrial CT to scan the sample, scan a picture at an interval of 10 micron...

Embodiment 3

[0050] A finite element analysis method for lotus-shaped porous metals based on inverse reconstruction, the tensile performance simulation of lotus-shaped porous Cu-0.8Cr, specifically includes the following steps:

[0051] (1) Preparation of lotus-shaped porous metal by directional solidification of gas-metal eutectic: This example uses high-purity copper (99.99%, mass fraction) and Cu-10%Cr (mass fraction) alloy, according to Cu-0.8Cr For the stoichiometric ratio of the alloy, put the weighed metal into the melting crucible, evacuate to 1Pa, then slowly heat until the metal melts, fill in high-purity hydrogen to 0.6MPa, and keep it at 1573K for 5 minutes, then turn on the pull-down system, the alloy The liquid flows out and solidifies in the mold, and the lotus-shaped porous Cu-0.8Cr is gradually drawn under the drive of the drawbar with a pulling speed of 25mm / min;

[0052] (2) Use industrial CT to scan the sample, scan a picture at an interval of 10 microns, obtain multipl...

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Abstract

The invention discloses a lotus root-shaped porous metal finite element analysis method based on reverse reconstruction, and the method comprises the steps of scanning a lotus root-shaped porous metalthrough employing an industrial CT, obtaining a plurality of continuous micron-scale pictures, and numbering the continuous micron-scale pictures in sequence; importing the pictures into medical picture software MIMICS 20.0 according to the number from small to large, and reconstructing a three-dimensional shape model of the alloy; carrying out surface optimization treatment on the three-dimensional shape model; converting the processed three-dimensional model into a CAD model; repairing the CAD model; importing the repaired model into a Hypermesh, firstly dividing triangular units, then generating tetrahedral units by the triangular units, and optimizing the quality of the generated tetrahedral units; exporting a grid file; and importing the exported grid file into ANSYS for finite element analysis. Compared with a traditional finite element simulation method, the method has the advantage that the real conditions of the object stress and the heated objects can be better reflected.

Description

technical field [0001] The invention relates to the technical field of reverse engineering, and discloses a finite element analysis method for lotus-shaped porous metals based on reverse reconstruction. Background technique [0002] The lotus-shaped porous metal material has directionality, not only has higher comprehensive performance (higher specific strength and specific modulus) than the original dense material, but also has some excellent properties that the original dense material does not have, such as: small stress concentration, Low density, high rigidity, large specific surface area, high thermal conductivity. Therefore, lotus-shaped porous metal materials have broad application prospects in high-tech fields such as medicine, aerospace, automobiles, electronics, construction, and nuclear industry. [0003] A lot of research has been done at home and abroad on the computer simulation of the properties of lotus-shaped porous metals. However, due to the complex stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 古航贞
Owner KUNMING UNIV OF SCI & TECH
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