Friction welding process heat flow microstructure multi-physical field numerical calculation method

Abstract

The invention discloses a friction welding process heat flow microstructure multi-physical field numerical calculation method, which comprises a first step of building a heat flow coupling numerical model: performing temperature and flow field full coupling calculation by using an Euler method which takes temperature into account so as to obtain the size and distribution ofthe temperature and the flow field at any time during a workpiece welding procedure; a second step of performing microstructure transformation calculation by using a Leblond phase transformation model and algorithm so as to obtain phase transformation tissue distribution; a third step of building a heat flow microstructure coupling numerical model based on the obtained temperature, flow field and the phase transformation distribution, and calculating a workpiece plastic zone and stress-strain during the welding procedure. When the method disclosed by the invention is used for simulating a friction welding process, a simulation result can be obtained efficiently and exactly, and the fit degree to an actual friction welding process can be increased.

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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