摘要
以2mm厚TC4钛合金板材作为研究对象,基于ABAQUS模拟软件对空冷和激冷条件下钛合金搅拌摩擦焊的温度场和失稳变形进行了研究,并对模拟结果进行了实验验证。结果表明:焊接过程中的温度场均为椭圆形分布,在垂直于焊缝方向残余应力均为双峰型分布。与空冷条件相比,激冷可减小焊接过程中温度峰值与高温分布范围;焊件表面拉应力的降低程度远大于焊件底部拉应力的降低程度。当激冷温度与距离分别是-30℃与20 mm时,激冷条件下焊件马鞍形相当于空冷条件下变形量的72.2%。
Abstract. Choosing 2 ram thick TC4 titanium alloy plate as the research object, temperature field and buckling deformation of FSW were simulated by the ABAQUS software under conditions of air cooling and intense cooling. Meanwhile, the results of simulation were verified by experiments. Re- sults show that the distribution of temperature field is of ellipse shape during welding process. The longitudinal stress perpendicular to the weld presented bimodal type. Compared with air cooling con- dition, the intense cooling decreases the peak temperature, narrows the distribution range of high temperature and reduces residual tensile stress in the surface where the reducing effect is greater than that in the bottom. The saddle shape deformation of welding plate under intense cooling condition is equivalent to 72.2 percent of that under air cooling condition, when the strength and distance of in- tense cooling are as --30℃ and 20 mm resDectivelv.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2016年第4期531-536,543,共7页
China Mechanical Engineering
基金
国家自然科学基金资助项目(51204111)
辽宁省自然科学基金资助项目(2013024004
2014024008)
关键词
搅拌摩擦焊
温度场
残余应力
失稳变形
friction stir welding（FSW） temperature field residual stress buckling deformation
