Finite element modeling method for ultrasonic detection of additive manufacturing microstructure

A technology of additive manufacturing and microstructure, applied in instrumentation, geometric CAD, design optimization/simulation, etc., can solve problems such as uneven grain size distribution, scattering attenuation, and structural noise

Pending Publication Date: 2021-01-01
WUHAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Arc additive manufacturing of metals uses arcs as a heat source. During the workpiece preparation process, due to fluctuations in temperature, workpiece material and size, power supply parameters and other factors, the system is difficult to be in a stable state
The internal polycrystalline structure has the characteris

Method used

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  • Finite element modeling method for ultrasonic detection of additive manufacturing microstructure
  • Finite element modeling method for ultrasonic detection of additive manufacturing microstructure
  • Finite element modeling method for ultrasonic detection of additive manufacturing microstructure

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Embodiment Construction

[0039] Below in conjunction with specific embodiment the present invention is described in further detail:

[0040] The present invention aims to propose a finite element model modeling method for ultrasonic detection of microstructures in additive manufacturing. Such as figure 1 As shown, the modeling method includes the following steps:

[0041] S101. Establish a geometric model of the microstructure of additive manufacturing, write a program in MATLAB to generate geometric model diagrams of grains in each region, form an overall model through matrix series, and adjust parameters to change the number of grains.

[0042] S102. Select an appropriate physical field, write a program in MATLAB to set the physical field of COMSOL, this time select the physical field interface of solid mechanics.

[0043] S103. Choose different crystal grains as one orientation, select 10 grains in MATLAB, and set the specific orientation information in COMSOL, set according to the above formula,...

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Abstract

The invention discloses a finite element modeling method for ultrasonic detection of an additive manufacturing microstructure. The modeling method comprises the following steps: firstly, generating the additive manufacturing microstructure, namely a grain structure; combining the regions with different grain sizes together to form an integral model; selecting a proper physical field; endowing different crystal grains with stiffness matrixes under different orientations; using COMSOL with MATLAB for storing grain geometry, a physical field interface and orientation information which are generated in the MATLAB as a model; connecting a server in the COMSOL to import the model; performing simulation calculations. The tedious process of drawing in COMSOL is omitted, and the modeling process issimplified; the crystal grains are large in number and small in area, the orientation of the crystal grains is difficult to endow in COMSOL, domain selection is directly carried out in MATLAB, and the crystal grains are more accurate and clearer. The additive manufacturing microstructure is analyzed through simulation, and the overall performance of the automobile part is pre-judged.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, and more specifically, relates to a method for modeling a finite element method for ultrasonic detection of microstructures in additive manufacturing in the automobile manufacturing process. Background technique [0002] Additive manufacturing technology is based on the principle of discrete-stacking. By establishing a digital model in advance and using powder or wire materials for multi-layer and multi-layer cladding accumulation, it can form large and complex structural parts in an integrated manner. Arc additive manufacturing uses an arc as a heat source to melt metal wires, and deposits them layer by layer on a metal substrate according to a set path. It has the advantages of short manufacturing cycle, good economy, high material utilization rate, and easy automation. Quickly manufacture parts with complex shapes and structures. Arc additive manufacturing is under the combined effects...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/15G06F113/10
CPCG06F30/23G06F30/15G06F2113/10
Inventor 秦训鹏潘晓萌汪小凯曾研
Owner WUHAN UNIV OF TECH
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