作　　者： ; ;

机构地区： 中国电子科技集团第十四研究所

出　　处： 《系统仿真学报》 2011年第5期881-885,共5页

摘　　要： 提出了一种基于瞬时相对线速度的搅拌头产热模型,利用ABAQUS有限元软件建立了焊接过程温度场有限元模型,对摩擦搅拌焊接过程温度场进行了数值模拟并利用有限元模型分析了焊接温度场的不对称性;在温度场有限元模型的基础上建立了摩擦搅拌焊接过程热力耦合有限元模型,利用ABAQUS有限元软件对焊接过程动态应力和焊后残余应力的分布进行了仿真模拟。结果表明:焊接过程最高温度低于被焊材料熔点,搅拌头前方温度梯度大于搅拌头后方,并且温度梯度随焊接速度的提高变化更为剧烈;焊接过程试件内存在动态应力场,随着试件的冷却逐渐转化为残余应力场,横向残余应力在试件内分布较广,大部分区域内为横向拉应力,而在试件周围拉应力逐渐转变为压应力,纵向残余应拉应力只局限于接近焊缝的一个很窄的区域,在周围区域有较低的压应力,距离焊缝越远其值越低。 An instantaneous relative linear velocity based heat source was proposed and was utilized to build the FEM model of friction stir welding process.Temperature distribution was numerically simulated and temperature asymmetry was analyzed.Sequentially-coupled thermo-mechanical simulations were performed and dynamic stress and residual stress distribution were simulated using ABAQUS software.Results show that peak temperature is lower than the melting point of 2A12,temperature grads ahead of the tool is bigger than that behind.Dynamic stresses will gradually transform into residual stresses during the cooling process.Transverse residual stresses which are mainly tensile stresses occupy most part of the specimen while longitudinal residual stresses only appear near the weld line.

关 键 词： 有限元 摩擦搅拌焊 温度场 残余应力

领　　域： [金属学及工艺]