摘要
采用有限元方法模拟分析了厚6 mm的Ti-6Al-4V钛合金电子束焊接过程,计算研究了瞬态温度场的分布特点、规律及特征点的温度变化历程,在准确计算焊接温度场的基础上通过热-应力顺序耦合,模拟计算了Ti-6Al-4V钛合金电子束焊接头的应力场的分布特征。结果表明:模拟计算的焊缝形貌与实际焊接试验所得基本吻合,焊接温度场整体呈卵形分布特征,具有明显的温度梯度;焊接接头区域呈现三维应力状态,应力分布复杂、无一定规律可循且高值应力集中于焊缝中心部位,应力峰值随距离焊缝中心距离的增加而降低,远离焊缝区域的应力峰值较低且分布及变化不明显。
The electron beam welding of Ti-6Al-4V titanium alloy with 6 mm thickness is simulated by using finite element analysis.The distribution features and regularities of transient temperature field and temperature variation curves of feature points are analyzed.Indirect coupling of thermal-stress is fulfilled based on the analysis of temperature field,and the stress distribution of Ti-6Al-4V titanium alloy joint by electron beam welding is calculated.Results show that the weld appearance of numerical simulation basically tallies with that of welding experiment,and the shape of temperature field is typically oval with obvious temperature gradient.The stress state of welded joint presents the characteristic of three-dimension residual stress.The distribution of stress is complex and appears randomly in this region,and moreover,the high value stress concentrates on the center of weld metal.However,the peak value stress becomes low with the distance from the weld center.Low stress far away from the weld center and the variation of stress distribution is not great.
出处
《电焊机》
北大核心
2011年第6期6-12,共7页
Electric Welding Machine
