Finite element modeling method for simulating high-energy beam welding

Abstract

The invention relates to a finite element modeling method for simulating high-energy beam welding, which comprises the following steps of: S1, establishing a model of a welding structure, obtaining aBajel unit, and inputting welding process parameters and material physical property parameters; s2, establishing a weld joint birth and death unit set of the model, and simulating a welding cladding process of each discrete time period; s3, generating a local refined Bayesian unit for an area near the heat source in each specific time period, and calculating a temperature field of a discrete timesequence; s4, for two adjacent specific time periods, mapping the grid control point variable corresponding to the current time period to the grid control point corresponding to the next time period;and S5, outputting the welding temperature thermal cycle curve of each sampling point in the whole time course and the temperature field of each moment. According to the method, self-adaptive heat transfer analysis of high-energy beam welding can be realized, the solving precision of a high-gradient solution near a heat source is ensured, and the solving scale is reduced.

Description

technical field [0001] The invention relates to the field of computer-aided engineering analysis, in particular to a finite element modeling method for simulating high-energy beam welding. Background technique [0002] Most welding processes involve intense localized heating at high power densities, resulting in complex metallurgical and mechanical behavior. Improper welding heat parameters will lead to high residual stress, and then produce deformation and micro-defects such as holes and cracks, which will affect the accuracy, strength and fatigue life of the welded structure. [0003] The finite element method is widely used in welding heat transfer problems. Its application in complex welded structures is still limited due to the computational burden imposed by localized heating. High power and small heat-generating areas result in high-temperature gradients that lead to strong local material nonlinear behavior of the part. In this case, in order to ensure the converge...

AI Technical Summary

Problems solved by technology

Traditional methods such as constraint method, element inheritance shape function method and polygon element method are all based on the discretized mesh, although they can handle transition elements, but due to the loss of geometric information, these adaptive methods are not really suitable for Adaptive Simulation of Complex Structures on Surfaces

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