基本信息
项目批准号：51405310
申请代码：E0508
项目名称：搅拌摩擦焊全局热流耦合模型及金属流动行为研究
项目负责人：高恩志
依托单位：沈阳航空航天大学
研究期限：2015-01-01 至 2017-12-31
资助经费：25.0（万元）

项目摘要
中文摘要：
搅拌摩擦焊（Friction Stir Welding，FSW）过程中，搅拌头附近的材料在高温下发生剧烈的塑性流动，其流动行为直接关系到接头质量。基于计算流体力学的FSW材料流动模拟是研究FSW过程中材料流动行为的重要手段。其可靠性模拟的前提是精确描述搅拌头-焊接构件接触行为及热源的产生。本项目拟在现有研究基础上，研究建立瞬时传热简化模型；研究建立搅拌头-焊接构件可变剪切应力接触界面模型；在此基础上建立FSW过程全局热流耦合模型。深入研究温度耦合影响下的FSW过程金属塑性流动演化规律。同时采用数值仿真及实验方法研究影响金属塑性流动规律的工艺因素及作用机理；基于金属流动演化预测建立FSW过程工艺的优化设计理论与控制方法。形成可预知焊缝质量、可控制金属流动的FSW理论与方法。本研究成果对发展我国先进焊接技术、加工过程的精确控制与优化理论具有重要意义。
英文摘要：
Friction stir welding (FSW) is a new solid state welding technique under the actions of mechanical forces and frictional heat. Significant plastic flow occurs at high temperature during FSW. The weld quality relates to the material flow pattern closely during FSW process. FSW simulation based on computational fluid dynamics becomes a powerful tool for investigating the material flow pattern during FSW. The premise of reliability simulation is accurate description of the material flow behavior and heat input on the tool-workpiece contact surface. This project focused on using computer simulation and the combination of experimental research, global heat-fluid coupling model based on the computational fluid dynamics theory and simulation method of FSW is established. Metal plastic flow evolution and effect factors are studied. FSW process optimization design theory and method of control is studied. The results of this study have important significance for provides guidance to the welding parameter optimization and to the designing of the friction stir welding tools, and give a theoretical basis on controlling the weld formation, obtaining a weld joint without defect.
 
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