逆向差速搅拌摩擦焊接材料塑性流变和热场的数值模拟

›› 2014, Vol. 50 ›› Issue (16): 140-146.

逆向差速搅拌摩擦焊接材料塑性流变和热场的数值模拟

石磊;武传松;刘会杰

山东大学材料液固结构演变与加工教育部重点实验室;哈尔滨工业大学先进焊接与连接国家重点实验室

发布日期:2014-08-20

Modeling Material Plastic Flow and Thermal Field in Reverse Dual-rotation Friction Stir Welding

SHI Lei; WU Chuansong; LIU Huijie

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, Shandong University State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology

Published:2014-08-20

摘要/Abstract

摘要： 逆向差速搅拌摩擦焊接是一种搅拌针与轴肩分离并逆向差速旋转的搅拌摩擦焊接新工艺。为了实现逆向差速搅拌摩擦焊接的工艺优化，掌握焊接工艺参数对接头组织和性能的影响规律，需要深入研究这一新工艺涉及的热物理机制。综合考虑焊接过程中的摩擦产热和塑性变形做功作用，建立逆向差速搅拌摩擦焊接过程中材料流动与热分布的三维耦合数理模型，研究焊接过程中温度分布特征、材料流动规律、搅拌头附近的应变速率分布以及黏度分布情况，获取焊接过程中搅拌头附近的材料流动规律、应变速率以及黏度分布的规律。对比分析逆向差速搅拌摩擦焊与常规搅拌摩擦焊在温度分布、材料流动以及搅拌头附近应变速率和黏度分布的差异。焊缝横断面的数值模拟结果与试验实测结果基本吻合。

关键词: 逆向差速搅拌摩擦焊;数值模拟;产热模型;传热过程;材料流动

Abstract: Reverse dual-rotation friction stir welding (RDR-FSW) is a novel variant of FSW process in which the tool pin and the assisted shoulder rotate reversely. Modeling and simulating the material flow and heat transfer phenomena is of great significance to completely understand the process mechanism. A three-dimensional model of RDR-FSW process is developed to conduct the numerical simulation of material flow and temperature profile during the process. Plastic deformation heat generation rate and friction heat generation rate during the process are both considered. The plastic material flow velocity fields, streamlines, strain rate and viscosity fields near the tool are studied. The predicted shape and size of thermal-mechanically affected zone(TMAZ) match well with the experimentally measured ones.

Key words: reverse dual-rotation friction stir welding (RDR-FSW);numerical simulation;heat generation model;heat transfer;material flow

中图分类号:

TG453
TG456

石磊;武传松;刘会杰. 逆向差速搅拌摩擦焊接材料塑性流变和热场的数值模拟[J]. , 2014, 50(16): 140-146.

SHI Lei;WU Chuansong;LIU Huijie. Modeling Material Plastic Flow and Thermal Field in Reverse Dual-rotation Friction Stir Welding[J]. , 2014, 50(16): 140-146.