Transactions of Materials and Heat Treatment

Title：Mechanism analysis for bump of SPF/DB four-sheet sandwich hollow structure

Authors： Liu Shengjing Lei Hailong Chen Fulong

Unit： Beijing Aeronautical Manufacturing Technology Research Institute

KeyWords： SPF/DB four-sheet sandwich hollow structure bump triangle area weak strength zone

ClassificationCode：TG146.2+3

year,vol(issue):pagenumber：2014,39(8):30-36

Abstract：

The typical forming process of SPF/DB four-sheet sandwich hollow structure was sketched. The analysis shows that the forming defects, such as rill-like folds, over-width, lower diffusion bonding strength and uneven wall thickness distribution, etc., are prone to appear in the external layer skin triangle area which becomes weak strength zone. The causes and mechanism of bump were revealed via mechanical and experimental analysis for bump forming process of triangle area. Pressure increasing caused by liquid vaporization in the hermetically sealed cavity is the primary cause of bump. The effects of various factors, such as liquid volume proportion, triangle area width and wall thickness of skin, etc., on initial plastic and continual deformation of bump were clarified. Finally the effective precautions and recommendations for bump of triangle area were given.

Funds：

总装备部“十二五”国防预研项目(51318040322)

刘胜京（1986-），男，硕士，工程师

Reference：

［1］Yoon J H，Lee H S，Yi Y M. Finite element simulation on superplastic blow forming of diffusion bonded 4 sheets[J].Journal of Materials Processing Technology, 2008，201: 68-72.
［2］蒋少松.TC4钛合金超塑成形精度控制[D].哈尔滨：哈尔滨工业大学,2009.Jiang S S. Accuracy Control of Superplastic Forming for TC4 Titanium alloy[D]. Harbin: Harbin Institute of Technology,2009.
［3］Indrajit Charit，Rajiv S Mishra，Murray W Mahoney. Multi-sheet structures in 7475 aluminum by friction stir welding in concert with post-weld superplastic forming [J]. Scripta Materialia，2002，47：631-636.
［4］Yan H H，Zhang K F. Processing of multi-sheet structures of an aluminum alloy by laser welding /superplastic forming [J]. Materials and Design，2010，31: 2220-2223.
［5］Xun Y W，Tan M J. Applications of superplastic forming and diffusion bonding to hollow engine blades[J]. Journal of Materials Processing Technology, 2000，99：80-85.
［6］Ji Sik Kim，Kevin Kibbl， Mark Stanford.Quantitative analysis on the anisotropic behaviour of superplastic deformation in laser melted (LM) Ti-6Al-4V alloy[J].Materials Science and Engineering A, 2012, 532:236-244.
［7］Han Wenbo，Zhang Kaifeng，Wang Guofeng. Superplastic forming and diffusion bonding for honeycomb structure of Ti-6Al-4V alloy[J]. Journal of Materials Processing Technology，2007，183：450-454.
［8］李志强，郭和平. 超塑成形/扩散连接技术的应用进展和发展趋势[J].航空制造技术，2010，（8）：32-35.Li Z Q, Guo H P. The superplastic forming and diffusion progress of application and development trend of technology[J]. Aeronautical Manufacturing Technology,2010,(8):32-35.
［9］于卫新，李淼泉，胡一曲.材料超塑性和超塑成形/扩散连接技术及应用[J].材料导报，2009，（6）：8-14.Yu W X, Li M Q, Hu Y Q. Application of superplasticity and superplastic forming and diffusion bonding technology[J]. Materials Review,2009,(6):8-14.
［10］李志强.钛合金超塑成形/扩散连接四层夹层结构[J].航空科学技术，1995，（6）：23-24.Li Z Q. Superplastic forming and diffusion bonding of four layer sandwich structure for Titanium alloy[J].Aeronautical Science and Technology,1995,(6):23-24.

Service：

【This site has not yet opened Download Service】【Add Favorite】