Wenbo HAN
,
Kaifeng ZHANG
,
Guofeng WANG
,
Xiaojun ZHANG
材料科学技术（英）
Superplastic forming and diffusion bonding (SPF/DB) is a well-established process for the manufacture of components almost exclusively from Ti-6Al-4V sheet material. The sandwich structure of Ti-6Al-4V alloy is investigated. The effects of the microstructure on the SPF/DB process were discussed. The microstructure at the interfaces and the distribution of thickness were researched.
关键词:
Superplastic forming
,
null
,
null
,
null
Kaifeng ZHANG
,
Wenbo HAN
,
Wei WU
,
Guofeng WANG
,
Dezhong WU
材料科学技术（英）
The research on numerical simulation for combinative process of SPF/DB is carried out in this paper. The contacting problem of sheets is analyzed by using the penalty method. In order to solve the contact problem of different parts of the sheet, a new algorithm for contacting judgment is proposed. According to the relation of the distance vector and the vector of contacting element area, and the condition of contact, it can be judged whether or not a node on the slave surface and the corresponding master surface are in the state of SPF/DB. The Mindlin shell element is employed to simulate SPF/DB process of an asymmetry double-cell cup of Ti-6Al-4V to examine the efficiency of the new algorithm using ARVIP-3D. The results of the numerical simulation are in good agreement with experimental results.
关键词:
Numerical simulation
,
null
,
null
,
null
徐萌萌
,
陈明和
,
王大刚
宇航材料工艺
选取TC4钛合金四层板加强结构中双层板为研究对象,采用激光穿透焊接工艺代替传统超塑成形/扩散连接(SPF/DB)工艺中涂止焊剂连接.借助ABAQUS有限元分析软件对超塑成形过程进行分析,得到优化的压力-时间(p-t)曲线,作为双层板超塑成形过程的气压加载曲线,进行实验验证.结果表明:成形后零件壁厚分布均匀,焊缝处无撕裂现象,与有限元模拟结果保持一致;用此新工艺代替传统SPF/DB工艺中的止焊剂具有可行性.
关键词:
TC4钛合金
,
激光焊接
,
超塑成形
,
数值模拟
