Finite element modeling method for ultrasonic detection of additive manufacturing microstructure

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...

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 characteristics of uneven grain size distribution, coarse grains, and strong elastic anisotropy, so it will have many effects on ultrasonic testing: for example, the coarse grain size will cause structural noise during ultrasonic propagation. , scattering attenuation, etc., which seriously affect the accuracy of defect detection

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