LY12合金摩擦焊接过程的热力耦合有限元数值模拟  

An Analysis of Coupled Temperature, Stress, and Strain Fields during Rotation Friction Welding of LY12 Aluminum Round Bars

作　　者：李庆华[1] 李付国[1] 傅莉[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《西北工业大学学报》2005年第1期134-137,共4页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金项目 (5 0 0 0 5 0 17)资助

摘　　要：摩擦焊接过程中界面的塑性变形是摩擦焊的核心 ,以宇航工程中常用的构件材料 LY1 2合金为研究对象 ,建立了棒状试件摩擦焊的热力耦合塑性成形有限元分析模型 ,应用 MSC公司商用有限元软件对摩擦焊接界面的变形行为进行了数值模拟 ,获得了焊接过程中焊接界面处材料的温度场、应力场、应变场等物理参量场的变化规律 。To understand better the process of friction welding, it is essential to calculate the variations of temperature, stress, and strain fields of welding interface material during the almost instantaneously completed friction welding process. As Chinese aluminum alloy LY12 is a commonly used aerospace material, we calculated such fields for continuously driven friction welding of LY12 alloy round bars. In the full paper we explain and discuss in much detail our FEM(finite element method) calculation and the calculated results. Here we give only a very concise summary. We established the coupled thermal-mechanical FEM model. The thermal-mechanical behavior of welding interface material was numerically simulated by using MSC Corp. commercial FEM software. For our numerical example, FEM result shows that 520℃, the lower limit of LY12 fusion point, is reached at the end of 0.35s of rotation friction welding. During the entire process of rotation friction welding, the calculated equivalent strains all increase monotonically; the equivalent strain at the center of circular section of interface material is the largest.

关 键 词：摩擦焊 热力耦合 温度场 应力场 应变场 

分 类 号：TG456.9[金属学及工艺—焊接]