论文部分内容阅读
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 finite element method was used to simulate the electron beam welding process of Ti-6Al-4V titanium alloy with a thickness of 6 mm. The distribution characteristics, regularity and temperature history of the transient temperature field were calculated and studied. Based on the thermal-stress sequential coupling, the distribution of the stress field in the Ti-6Al-4V titanium electron beam welded joint was simulated. The results show that the simulated welding seam morphology is in good agreement with the actual welding experiment. The welding temperature field is oval in shape and has obvious temperature gradient. The welded joint area shows three-dimensional stress state and the stress distribution is complex without any regularity The high stress is concentrated in the center of the weld. The stress peak decreases with the increase of the distance from the center of the weld. The peak stress away from the weld zone is lower and its distribution and variation are not obvious.