Prediction of Welding Deformation of Complex Thin Wall Structure of 1 500 MPa Grade Ultra-High Strength Steel

doi:10.3901/JME.2023.24.095

Abstract

Abstract: Based on the MSC. Marc software platform, a thermo-elastic-plastic finite element method considering material nonlinearity, geometric nonlinearity and boundary nonlinearity was developed to simulate welding deformation of thin-plate weldments. An elastic finite element method based on inherent strain theory was also developed to calculate welding deformation for large complex welded structures. Firstly, a 1 500 MPa ultra-high-strength steel sheet butt joint was taken as the research object, and the thermo-elastic-plastic finite element method and the inherent strain method were employed to calculate its welding deformation. The computational accuracy of these two numerical simulation methods was verified by comparing with the corresponding experimental results, and the calculation errors were both less than 15%. Then, taking a large complex thin-walled structure of 1 500 MPa grade ultra-high strength steel as the research object, the inherent deformations of typical welded joints in the thin-walled structure under free and forced constraint conditions were calculated by the thermo-elastic-plastic finite element method, and the influence of constraint conditions on the welding deformation of butt joints is investigated. Finally, the overall welding deformation of the ultra-high-strength steel complex thin-walled structure was calculated by elastic finite element method based on the inherent strain theory, and the effect of external restraint on the total welding deformation was also studied numerically. The simulation results show that the overall deformation of the thin-walled structure can be reduced to a certain extent by using external restraint.

Key words: welding deformation, inherent strain, numerical simulation, external restraint, ultra-high-strength steel, thin-plate structure

CLC Number:

TG404

LIANG Guihui, XIE Feng, HAN Shiwei, LUO Wenze, DENG Dean. Prediction of Welding Deformation of Complex Thin Wall Structure of 1 500 MPa Grade Ultra-High Strength Steel[J]. Journal of Mechanical Engineering, 2023, 59(24): 95-107.

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