Multiphysics Numerical Calculation Method of Thermal Flow Microstructure in Friction Welding Process

Abstract

The invention discloses a multi-physics field numerical calculation method for thermal flow microstructure in a friction welding process, comprising the following steps: Step 1, establishing a thermal-fluid coupling numerical model, and using a Lagrangian-Eulerian grid to fully couple the temperature and the flow field Calculate and obtain the temperature and flow field size and distribution at any time during the welding process of the workpiece; Step 2, use the Leblond and K‑M phase transition model and algorithm to calculate the microstructure transition, and obtain the distribution of the phase transition structure; Step 3, based on the obtained temperature , flow field and phase change structure distribution, establish thermal-force-flow-structure coupling numerical model, and calculate the plastic area and stress-strain of the workpiece during welding. The invention can efficiently and accurately obtain simulation calculation results when used for friction welding process simulation, and can improve the coincidence degree with the actual friction welding process.

Description

technical field [0001] The invention relates to a simulation technology of a friction welding process, in particular to a multi-physics field numerical calculation method of a thermal flow microstructure of a friction welding process. Background technique [0002] Friction welding is a process that uses the heat generated by the mutual movement and friction between the stirring head and the surface of the workpiece to melt the surface of the workpiece to make it reach a thermoplastic state, and then quickly upset the stirring head to weld the two plates together. [0003] The computer simulation of the friction welding process mainly focuses on four aspects: temperature field simulation, to study the temperature and heat transfer process of the workpiece during the welding process; flow simulation, to study the flow conditions of the plastic zone near the weld seam of the workpiece during the welding process; stress-strain simulation, to study The overall stress and strain d...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low efficiency and precision existing in the simulation of the existing friction welding process and the low degree of agreement with the actual friction welding process, and provides a multi-physics numerical calculation method for the thermal flow microstructure of the friction welding process. When used for friction welding process simulation, the simulation calculation results can be obtained efficiently and accurately, and the coincidence with the actual friction welding process can be improved

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